CN115962576A - Bathing wastewater heating water system for realizing cleaning of wastewater channel and cleaning method thereof - Google Patents

Abstract

The invention discloses a bathing wastewater hot water production system for realizing cleaning of a wastewater channel and a cleaning method thereof. Compared with the traditional regular cleaning, the bathing wastewater heating water system for realizing the cleaning of the wastewater channel and the cleaning method thereof have the advantages that the method of monitoring through the sensor is more accurate and effective, the cleaning process is simple and convenient compared with the traditional cleaning after disassembly and assembly, and the automation is convenient to realize.

Description

Bathing wastewater hot water system for realizing wastewater channel cleaning and cleaning method thereof

Technical Field

The invention relates to the technical field of a bathing wastewater hot water delivery system, and in particular to a bathing wastewater hot water production system for realizing wastewater passage cleaning and a cleaning method thereof.

Background Art

Although the temperature of bathing wastewater is relatively low, the heat energy contained in it is still of great value. Therefore, the pre-wastewater and clean water heat exchanger (using a shell and tube heat exchanger, hereinafter referred to as the heat exchanger), water source heat pump, and water source heat pump can be used to absorb heat from the wastewater step by step and heat the clean water step by step to achieve the purpose of producing hot water for bathing. Since 2009, the applicant has used the bathing wastewater hot water system in more than 60 universities in my country, with an annual water production of more than 3 million tons.

After long-term operation, the wastewater channel of the heat exchanger is filled with bathing wastewater, which contains body fat secreted by the human body, mud wiped off the body surface, and hair and dandruff from metabolism, which makes it inevitable that dirt will adhere to the inner wall of the wastewater channel. Once these dirts adhere to the inner wall of the pipe and form scale, they will affect the flow in the pipeline, thereby affecting the flow entering the heat exchange equipment. The flow of the heat exchange medium entering the heat exchange equipment will be reduced, which will lead to the heat exchange effect of the heat exchange equipment; once these dirts adhere to the inner wall of the heat exchange equipment, they will directly lead to the heat transfer efficiency of the heat exchange equipment, thereby affecting the heat exchange efficiency of different heat exchange media in the heat exchange equipment. If it is not cleaned in time, the longer the dirt accumulates, the more difficult it is to remove, and it may even cause pipeline blockage, resulting in failure to work normally. Therefore, it is very necessary to monitor the scaling in real time so as to clean it in time, but there is currently no good way to monitor the scaling of the inner wall; and it is also necessary to upgrade and improve the existing system pipeline to facilitate the cleaning of the wastewater pipeline of the existing system.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bathing wastewater hot water system and a cleaning method thereof for cleaning the wastewater passage. Compared with traditional timed cleaning, the method of monitoring by sensors is more accurate and effective, avoiding the waste and trouble caused by too short intervals during timed cleaning, and the disadvantages of dirt accumulation that is difficult to remove due to too long intervals. Through the transformation of the corresponding pipelines, the heat exchange efficiency of the heat exchanger in the wastewater passage can be monitored by sensors, and the wastewater passage can be cleaned without disassembly to the hot water system. The operation is simple and convenient, and the heat exchange effect after cleaning can also be monitored by a temperature sensor. Compared with traditional cleaning after disassembly, the cleaning process is simple and quick, and it is easy to realize automation.

The technical solution adopted by the present invention is:

The scaling detection method of the heat exchanger comprises the following steps: the bathing wastewater inlet of the heat exchanger is respectively connected with a pipeline provided with a flow meter A and a temperature sensor A, the bathing wastewater outlet of the heat exchanger is respectively connected with a pipeline provided with a temperature sensor B, the clean water inlet of the heat exchanger is respectively connected with a pipeline provided with a flow meter B and a temperature sensor D, and the clean water outlet of the heat exchanger is respectively connected with a pipeline provided with a temperature sensor C; the pipeline connected with the bathing wastewater passage of the heat exchanger is also connected with a valve B, and the pipeline connected with the clean water passage of the heat exchanger is also connected with a valve D, and both valve B and valve D are regulating valves;

During the heat exchange process of the heat exchanger, the flow ratio of the wastewater and the clean water flowing through the heat exchanger is kept unchanged by adjusting valve B and valve D during the adjustment period, and the data measured by flow meter A, flow meter B, temperature sensor A, temperature sensor B, temperature sensor C and temperature sensor D are recorded respectively. After obtaining the data, valve B and valve D are adjusted to the initial heat exchange state of the heat exchanger;

；Given the heat transfer equation:

;

Where: K is the total heat transfer coefficient, S is the heat transfer area,

；And the heat balance equation:

;

Wherein: q1 is the reference value of the flow rate of bathing wastewater flowing through the heat exchanger obtained when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located, q2 is the reference value of the flow rate of clean water flowing through the heat exchanger obtained when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located, c is the specific heat of water, t1 is the reference value of the temperature before heat exchange of bathing wastewater when entering the heat exchanger when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located, t2 is the reference value of the temperature before heat exchange of bathing wastewater when leaving the heat exchanger when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located, t4 is the reference value of the temperature before heat exchange of clean water when entering the heat exchanger when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located, t3 is the reference value of the temperature after heat exchange of clean water when leaving the heat exchanger when the benchmark test is performed after the initial installation of the heat exchanger where the heat exchanger is located;

使用对数平均温差：

；

Use the log mean temperature difference:

;

的值接近为1，

平均温差按照如下公式计算：When the flow rate of bathing wastewater and clean water through the heat exchanger is the same,

The value of is close to 1,

The average temperature difference is calculated according to the following formula:

；

;

After testing, it was found that when the difference between the wastewater flow and the clean water flow was within 30%, the deviation of the calculation results of the two methods was less than 1%, and when the difference was within 50%, the deviation of the calculation results was less than 2%. In fact, when bathing wastewater is used to make hot water, the flow rates of wastewater and clean water are very close, and the difference in the calculation results of the two methods is very small. For the convenience of calculation, the average difference between the wastewater flow and the clean water flow during actual use does not exceed 15%, and the instantaneous difference can be controlled within 50%. Therefore, the arithmetic mean temperature difference can be directly used instead of the logarithmic mean temperature difference for calculation.

At this point, the above three formulas can be derived as follows:

；

;

取4187J/（kg*℃），q1’为检测结束时的洗浴废水进入换热器时的流量；Where: Specific heat of water

Take 4187J/(kg*℃), q1' is the flow rate of bathing wastewater entering the heat exchanger at the end of the test;

During the heat exchange process of the heat exchanger, valve B and valve D are adjusted intermittently for multiple times, so that flow meter A, flow meter B, temperature sensor A, temperature sensor B, temperature sensor D and temperature sensor C respectively measure the actual measured value q1' of the flow rate of the bathing wastewater flowing through the heat exchanger, the actual measured value q2' of the flow rate of the clean water flowing through the heat exchanger, the actual measured value t1' of the temperature of the bathing wastewater before heat exchange, the actual measured value t2' of the temperature of the bathing wastewater after heat exchange, the actual measured value t4' of the temperature of the clean water before heat exchange and the actual measured value t3' of the temperature of the clean water after heat exchange;

Let t2'' be the theoretical temperature value of the wastewater after heat exchange, and t3'' be the theoretical temperature value of the clean water after heat exchange.

Then KS is calculated according to the formula:

；

;

Then use the formula and substitute it into KS to calculate t2’’:

；

;

Then use the formula and substitute t2'' to calculate t3'':

Compare t3'' with t3' and t4'. If:

Where α is the deviation limit of the fresh water outlet temperature;

This indicates that scaling of the heat exchanger seriously affects its use.

A further improvement of the present invention is that when the heat exchange system in which the heat exchanger is located is initially installed and a benchmark test is performed, valves D and D are used to make the clean water flow rate entering the heat exchanger equal to the waste water flow rate, and the heat exchange system monitors flow meter A, flow meter B, temperature sensor A, temperature sensor B, temperature sensor D and temperature sensor C at intervals over a period of time. When the monitored data simultaneously meet the following indicators:

的最高值和最低值各自与各洗浴废水流量实测值

的平均值的偏差均不超过p1；A. Actual measured value of bathing wastewater flow

The highest and lowest values are respectively related to the measured values of the bathing wastewater flow

The deviation of the mean value does not exceed p1;

B. The deviations of the highest and lowest values of the measured clean water flow rate q2' from the average values of the measured bathing wastewater flow rates q2' do not exceed p1;

C. The deviation between the average value of each measured value of the bathing wastewater flow rate q1' and the average value of each measured value of the bathing wastewater flow rate q2' does not exceed p2;

D. The error between the highest and lowest values of the actual measured temperature t1' of the bathing wastewater before heat exchange and the average value of the actual measured temperature t1' of each bathing wastewater before heat exchange does not exceed t0;

E. The error between the highest and lowest values of the actual measured temperature value t2' of the wastewater after heat exchange and the average value of the actual measured temperature value t2' of each wastewater after heat exchange does not exceed t0;

F. The error between the highest and lowest values of the actual measured value t4' of the temperature of the clean water before heat exchange and the average value of the actual measured value t4' of the temperature of the clean water before heat exchange does not exceed t0;

G. The error between the highest and lowest values of the temperature measured after the clean water heat exchange t3' and the average value of the temperature measured after the clean water heat exchange t3' does not exceed t0;

The average value of the actual measured values q1’ of the bathing wastewater flow rate measured during monitoring is used as the bathing wastewater flow rate reference value q1, the average value of the actual measured values q2’ of the clean water flow rate measured during monitoring is used as the clean water flow rate reference value q2, the average value of the actual measured values t1’ of the bathing wastewater temperature before heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t1 before heat exchange, the average value of the actual measured values t2’ of the bathing wastewater temperature after heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t2 after heat exchange, the average value of the actual measured values t4’ of the clean water temperature before heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t4 before heat exchange, and the average value of the actual measured values t3’ of the clean water temperature after heat exchange measured during monitoring is used as the clean water temperature reference value t3 after heat exchange.

A further improvement of the present invention is that the total duration of the interval monitoring is within the range of 3 to 10 minutes, and the time of each monitoring interval is less than 10 seconds.

A further improvement of the present invention is that the p1 is in the range of 2% to 5%, the p2 is in the range of 2% to 5%, and the t0 is in the range of 0.2°C to 0.5°C.

A further improvement of the present invention is that the clean water outlet temperature deviation limit α is in the range of 5% to 15%.

A bathing wastewater hot water system for cleaning wastewater passages using the detection method described above comprises a bathing wastewater tank, a heat exchanger, a heat source water pump A, a heat source water pump B, a hot water tank and a cleaning liquid tank, the top of the bathing wastewater tank being connected to a bathing wastewater drainage network via a bathing wastewater pipe E, the bottom of a side wall of the bathing wastewater tank being connected to a bathing wastewater inlet of the heat exchanger via a bathing wastewater pipe A, the bathing wastewater outlet of the heat exchanger being connected to an evaporator inlet of the heat source water pump B via a bathing wastewater pipe B, the evaporator outlet of the heat source water pump B being connected to an evaporator inlet of the heat source water pump A via a bathing wastewater pipe C, and the heat source water pump The liquid outlet of the evaporator of A is connected to the municipal drainage network through the bathing wastewater pipe D, the clean water inlet of the heat exchanger is connected to the tap water outlet pipe of the tap water network through the clean water pipe A, the clean water outlet of the heat exchanger is connected to the condenser inlet of the heat source water pump A through the clean water pipe B, the condenser outlet of the heat source water pump A is connected to the condenser inlet of the heat source water pump B through the clean water pipe C, the condenser outlet of the heat source water pump B is connected to the upper part of the hot water tank through the clean water pipe D, the lower part of the side wall of the hot water tank is connected to the domestic hot water supply system, the tap water outlet pipe is also connected to the top of the cleaning liquid tank through the clean water pipe E, and the cleaning The bottom of the liquid tank is also connected to the bathing wastewater pipe A through a cleaning liquid pipe A. The bathing wastewater pipe A is connected to the bathing wastewater pipe D through a cleaning liquid pipe B at a connection point between the cleaning liquid pipe A and the bathing wastewater inlet of the heat exchanger. The bathing wastewater pipe A is connected to the cleaning liquid pipe A through a cleaning liquid pipe C at a connection point between the cleaning liquid pipe B and the bathing wastewater inlet of the heat exchanger. The bathing wastewater pipe A is provided with a valve A at a connection point between the bathing wastewater tank and the cleaning liquid pipe A, a pump A is provided between a connection point between the cleaning liquid pipe A and a connection point between the cleaning liquid pipe B, and a connection point between the cleaning liquid pipe B and a connection point between the cleaning liquid pipe C. A valve B is provided, and a flow meter A and a temperature sensor A are connected in sequence between the connecting point of the cleaning liquid pipe C and the bathing waste water inlet of the heat exchanger along the direction facing the heat exchanger; the bathing waste water pipe B is connected with a temperature sensor B; the bathing waste water pipe D is connected between the connecting point of the cleaning liquid pipe B and the municipal drainage network and is provided with a valve C; the clean water pipe B is connected with a temperature sensor C; the clean water pipe A is connected with a flow meter B and a temperature sensor D; the clean water pipe D is connected with a valve D; the cleaning liquid pipe C is connected with a valve F; the cleaning liquid pipe A is connected with a pump B and a valve L in sequence along the direction away from the cleaning liquid tank.

A further improvement of the present invention is that the connection point between the cleaning liquid pipe C on the cleaning liquid pipe A and the cleaning liquid tank is connected to the bottom of the side wall of the cleaning liquid tank through a cleaning liquid pipe D, and a valve K is provided on the cleaning liquid pipe D.

A further improvement of the present invention is that a liquid level sensor A is further provided on the side wall of the cleaning liquid tank, a liquid level sensor A is further provided on the side wall of the hot water tank, and a liquid level sensor B is further provided on the side wall of the bathing waste water tank.

A further improvement of the present invention is that a valve G is provided on the bathing waste water pipe A between the bathing waste water tank and the valve A.

A further improvement of the present invention is that an automatic exhaust valve is provided on the bathing waste water pipe D between the connection point of the cleaning liquid pipe B and the valve C.

A further improvement of the present invention is that a valve H is provided on the tap water outlet pipe.

A further improvement of the present invention is that a valve I is provided on the cleaning liquid pipe A between the pump B and the cleaning liquid tank.

A further improvement of the present invention is that a check valve is provided on the cleaning liquid pipe A between the valve L and the connecting point of the cleaning liquid pipe C.

A further improvement of the present invention is that a valve J is provided on the clean water pipe E.

The method for cleaning the wastewater passage of the bathing wastewater hot water system as described above comprises the following steps:

或者当满足

、且洗浴废水制热水系统自第一次使用开始正常运行一段时间或自上一次清洗后再次正常运行一段时间后，将热源水泵A、热源水泵B和泵A关闭，并且将流量表A断电、将阀A和阀D关闭，将阀B、阀C、阀E和阀F打开，从而将洗浴废水管A位于阀A与换热器之间部分、换热器的洗浴废水通路、洗浴废水管B、洗浴废水管C、热源水泵A的蒸发器、热源水泵B的蒸发器、洗浴废水管D、清洗液管B、清洗液管C和清洗液管A位于阀L与洗浴废水管A连通处之间部分内的水排空；1) When satisfied

Or when satisfied

, and after the bathing wastewater hot water system has been operating normally for a period of time since the first use or has been operating normally again for a period of time since the last cleaning, turn off the heat source water pump A, heat source water pump B and pump A, and cut off the power to the flow meter A, close valve A and valve D, and open valve B, valve C, valve E and valve F, so as to drain the water in the part of the bathing wastewater pipe A between valve A and the heat exchanger, the bathing wastewater passage of the heat exchanger, the bathing wastewater pipe B, the bathing wastewater pipe C, the evaporator of the heat source water pump A, the evaporator of the heat source water pump B, the bathing wastewater pipe D, the cleaning liquid pipe B, the cleaning liquid pipe C and the cleaning liquid pipe A between the valve L and the connection point of the bathing wastewater pipe A;

2) Keep pump B started, valve C and valve K closed, and valve L open, so that the cleaning liquid in the cleaning liquid tank is injected into the empty pipe. When the empty pipe is filled with cleaning liquid, close pump B and valve C;

3) Close valve B and start pump A, so that the cleaning liquid in the pipeline circulates in the pipeline to flush the inner wall of the pipeline. The flow direction of the cleaning liquid when it circulates through the bathing wastewater passage of the heat exchanger is opposite to the flow direction of the bathing wastewater when the bathing wastewater hot water system is operating normally;

4) After the cleaning liquid circulates in the pipeline for a period of time, turn off pump A, let the cleaning liquid stand in the pipeline for a period of time, and then repeat step 3);

5) Open valve B and valve C again to drain the cleaning liquid in the pipeline again. When the cleaning liquid is completely drained, the cleaning is completed;

6) After cleaning is completed, open valve A again, close valves C, E and F, and connect flow meter A to the power supply, so that the bathing wastewater hot water system returns to the standby state for normal operation and hot water production.

A further improvement of the present invention is that the bathing wastewater hot water system cleans the wastewater passage when the time since the first use of the hot water system began to operate normally or the time since the last cleaning is greater than or equal to the cleaning interval, or when the time since the first use of the hot water system began to operate normally or the time since the last cleaning is greater than or equal to the cleaning interval days.

A further improvement of the present invention is that when the level of the cleaning liquid in the cleaning liquid tank reaches or exceeds the height of the liquid level sensor A, the bathing wastewater hot water system cleans the wastewater passage.

A further improvement of the present invention is that when the hot water level in the hot water tank reaches or exceeds the height of the liquid level sensor B, the bathing wastewater hot water system cleans the wastewater passage.

A further improvement of the present invention is that when the level of the bathing waste water in the bathing waste water tank reaches or is lower than the height of the liquid level sensor C, the bathing waste water hot water system cleans the waste water passage.

A further improvement of the present invention is that the bathing wastewater hot water system cleans the wastewater passage when the time is between 11pm and 12pm or between 0am and 7am.

A further improvement of the present invention is that the cleaning interval is in the range of 150 to 250 hours, and the cleaning interval is in the range of 20 to 40 days.

A further improvement of the present invention is that in the step 1), during the emptying period, the valve K is opened and the pump B is started, so that the cleaning liquid in the cleaning liquid tank circulates and the crystals in the cleaning liquid in the cleaning liquid tank are washed until they are completely dissolved in the cleaning liquid;

A further improvement of the present invention is that when the bathing wastewater hot water system operates normally, valve G, valve H and valve I remain normally open.

A further improvement of the present invention is that in step 1) and step 5), the emptying time is in the range of 6 to 15 minutes.

A further improvement of the present invention is that in step 3), the flushing time is in the range of 20 to 40 minutes.

A further improvement of the present invention is that in step 4), the time for standing and dissolving is in the range of 3 to 5 hours.

A further improvement of the present invention is that when the bathing wastewater hot water system has been running for 100 hours within the cleaning interval after the last cleaning, and the bathing wastewater hot water system still fails to obtain an effective scaling detection value, the bathing wastewater hot water system displays an alarm message that the scaling condition cannot be detected, thereby facilitating inspection and maintenance of the bathing wastewater direct heating system.

A further improvement of the present invention is that when the liquid level in the cleaning liquid tank is lower than the height of the liquid level sensor A, the bathing wastewater hot water system displays an alarm message that cleaning agent and replenishing water are needed, and cleaning agent is added to the cleaning liquid tank in time, and quantitative water replenishment is performed.

A further improvement of the present invention is that when the bathing wastewater hot water system has been operating normally for 72 hours since its first use or since the last cleaning, or when the bathing wastewater hot water system has been operating normally for a number of days or more since the last cleaning, but the bathing wastewater hot water system cannot perform wastewater channel cleaning because the liquid level in the cleaning liquid tank is lower than the height of the liquid level sensor A, the hot water level in the hot water tank is lower than the height of the liquid level sensor B, the bathing wastewater level in the bathing wastewater tank is higher than the height of the liquid level sensor C, or the time is between 7 a.m. and 11 p.m., the bathing wastewater hot water system displays an alarm message that the bathing wastewater hot water system needs to perform wastewater channel cleaning.

A further improvement of the present invention is that when the bathing wastewater hot water system is used normally to produce hot water, pump A is started, pump B is turned off, valve A and valve B are opened, and valves E, F, K and L are closed, and valves B and valve D are used to control the ratio of the bathing wastewater flow rate to the clean water flow rate to be 1:1.

A further improvement of the present invention is that when the bathing wastewater hot water system prevents crystallization in the cleaning liquid tank, valve K is opened and valve L is closed at intervals of 4 to 10 hours, and then pump B is started and operated for 2 to 5 minutes.

The beneficial effects of the present invention are:

First, the bathing wastewater hot water system for cleaning the wastewater passage and the cleaning method thereof of the present invention are more accurate and effective than the traditional timed cleaning method through sensor monitoring, thereby avoiding the waste and trouble caused by too short intervals during timed cleaning and the disadvantages of dirt accumulation and difficulty in cleaning caused by too long intervals.

Secondly, the bathing wastewater hot water system and cleaning method for cleaning the wastewater passage of the present invention can monitor the heat exchange efficiency of the heat exchanger in the wastewater passage through the modification of the corresponding pipelines, and can also achieve the effect of cleaning the wastewater passage without disassembly and assembly of the hot water system. The operation is simple and convenient, and the heat exchange effect after cleaning can also be monitored by the temperature sensor.

Thirdly, the bathing wastewater hot water system and the cleaning method thereof for realizing the cleaning of the wastewater passage of the present invention are simple and convenient in the cleaning process compared with the traditional cleaning after disassembly and assembly, and are easy to realize automation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a pipeline of the present invention.

DETAILED DESCRIPTION

As shown in FIG. 1 , the heat exchanger scaling detection and the hot water system for cleaning the wastewater passage and the cleaning method thereof, the heat exchanger scaling detection method comprises the following steps:

The bathing wastewater inlet of the heat exchanger 2 is respectively connected to a pipeline provided with a flow meter A32 and a temperature sensor A34, the bathing wastewater outlet of the heat exchanger 2 is respectively connected to a pipeline provided with a temperature sensor B35, the clean water inlet of the heat exchanger 2 is respectively connected to a pipeline provided with a flow meter B33 and a temperature sensor D37, and the clean water outlet of the heat exchanger 2 is respectively connected to a pipeline provided with a temperature sensor C36; the pipeline connected to the bathing wastewater passage of the heat exchanger 2 is also connected to a valve B24, and the pipeline connected to the clean water passage of the heat exchanger 2 is also connected to a valve D26, and the valve B24 and valve D26 are both regulating valves;

During the heat exchange process of the heat exchanger 2, the flow ratio of the waste water and the clean water flowing through the heat exchanger 2 is maintained unchanged by adjusting the valve B24 and the valve D26, and the data measured by the flow meter A32, the flow meter B33, the temperature sensor A34, the temperature sensor B35, the temperature sensor C36 and the temperature sensor D37 are recorded respectively. After obtaining the data, the valve B24 and the valve D26 are adjusted to the initial heat exchange state of the heat exchanger 2;

；Given the heat transfer equation:

;

Where: K is the total heat transfer coefficient, S is the heat transfer area,

；And the heat balance equation:

;

Wherein: q1 is the reference value of the flow rate of bathing wastewater flowing through the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located, q2 is the reference value of the flow rate of clean water flowing through the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located, c is the specific heat of water, t1 is the reference value of the temperature before heat exchange of bathing wastewater when entering the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located, t2 is the reference value of the temperature before heat exchange of bathing wastewater when leaving the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located, t4 is the reference value of the temperature before heat exchange of clean water when entering the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located, t3 is the reference value of the temperature after heat exchange of clean water when leaving the heat exchanger 2 obtained when the benchmark test is performed after the initial installation of the heat exchange system where the heat exchanger 2 is located;

使用对数平均温差：

；

Use the log mean temperature difference:

;

的值接近为1，

平均温差按照如下公式计算：When the flow rate of bathing wastewater and clean water through the heat exchanger is the same,

The value of is close to 1,

The average temperature difference is calculated according to the following formula:

；

;

After testing, it was found that when the difference between the wastewater flow and the clean water flow was within 30%, the deviation of the calculation results of the two methods was less than 1%, and when the difference was within 50%, the deviation of the calculation results was less than 2%. In fact, when bathing wastewater is used to make hot water, the flow rates of wastewater and clean water are very close, and the difference in the calculation results of the two methods is very small. For the convenience of calculation, the average difference between the wastewater flow and the clean water flow during actual use does not exceed 15%, and the instantaneous difference can be controlled within 50%. Therefore, the arithmetic mean temperature difference can be directly used instead of the logarithmic mean temperature difference for calculation.

At this point, the above three formulas can be derived as follows:

；

;

取4187J/（kg*℃），q1’为检测结束时的洗浴废水进入换热器时的流量；Where: Specific heat of water

Take 4187J/(kg*℃), q1' is the flow rate of bathing wastewater entering the heat exchanger at the end of the test;

During the heat exchange process of the heat exchanger, valve B and valve D are adjusted intermittently for multiple times, so that flow meter A, flow meter B, temperature sensor A, temperature sensor B, temperature sensor D and temperature sensor C respectively measure the actual measured value q1' of the flow rate of the bathing wastewater flowing through the heat exchanger, the actual measured value q2' of the flow rate of the clean water flowing through the heat exchanger, the actual measured value t1' of the temperature of the bathing wastewater before heat exchange, the actual measured value t2' of the temperature of the bathing wastewater after heat exchange, the actual measured value t4' of the temperature of the clean water before heat exchange and the actual measured value t3' of the temperature of the clean water after heat exchange;

Let t2'' be the theoretical temperature value of the wastewater after heat exchange, and t3'' be the theoretical temperature value of the clean water after heat exchange.

Then KS is calculated according to the formula:

；

;

Then use the formula and substitute it into KS to calculate t2’’:

；

;

Then use the formula and substitute t2'' to calculate t3'':

Compare t3'' with t3' and t4'. If:

Where α is the deviation limit of the fresh water outlet temperature;

This indicates that scaling of the heat exchanger seriously affects its use.

When the heat exchange system where the heat exchanger 2 is located is initially installed and the benchmark test is performed, valves D24 and D26 make the clean water flow rate entering the heat exchanger 2 equal to the waste water flow rate, and the heat exchange system monitors the flow meter A32, flow meter B33, temperature sensor A34, temperature sensor B35, temperature sensor D37 and temperature sensor C36 at intervals for a period of time. When the monitored data meet the following indicators at the same time:

的最高值和最低值各自与各洗浴废水流量实测值

的平均值的偏差均不超过p1；A. Actual measured value of bathing wastewater flow

The highest and lowest values are respectively related to the measured values of the bathing wastewater flow

The deviation of the mean value does not exceed p1;

B. The deviations of the highest and lowest values of the measured clean water flow rate q2' from the average values of the measured bathing wastewater flow rates q2' do not exceed p1;

C. The deviation between the average value of each measured value of the bathing wastewater flow rate q1' and the average value of each measured value of the bathing wastewater flow rate q2' does not exceed p2;

D. The error between the highest and lowest values of the actual measured temperature t1' of the bathing wastewater before heat exchange and the average value of the actual measured temperature t1' of each bathing wastewater before heat exchange does not exceed t0;

E. The error between the highest and lowest values of the actual measured temperature value t2' of the wastewater after heat exchange and the average value of the actual measured temperature value t2' of each wastewater after heat exchange does not exceed t0;

F. The error between the highest and lowest values of the actual measured value t4' of the temperature of the clean water before heat exchange and the average value of the actual measured value t4' of the temperature of the clean water before heat exchange does not exceed t0;

G. The error between the highest and lowest values of the temperature measured after the clean water heat exchange t3' and the average value of the temperature measured after the clean water heat exchange t3' does not exceed t0;

The average value of the actual measured values q1’ of the bathing wastewater flow rate measured during monitoring is used as the bathing wastewater flow rate reference value q1, the average value of the actual measured values q2’ of the clean water flow rate measured during monitoring is used as the clean water flow rate reference value q2, the average value of the actual measured values t1’ of the bathing wastewater temperature before heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t1 before heat exchange, the average value of the actual measured values t2’ of the bathing wastewater temperature after heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t2 after heat exchange, the average value of the actual measured values t4’ of the clean water temperature before heat exchange measured during monitoring is used as the bathing wastewater temperature reference value t4 before heat exchange, and the average value of the actual measured values t3’ of the clean water temperature after heat exchange measured during monitoring is used as the clean water temperature reference value t3 after heat exchange.

The total duration of interval monitoring is in the range of 3 to 10 minutes, and the interval between each monitoring is less than 10 seconds.

The p1 is in the range of 2% to 5%, the p2 is in the range of 2% to 5%, and the t0 is in the range of 0.2°C to 0.5°C.

The clean water outlet temperature deviation limit α is 10%.

A bathing wastewater hot water system that uses the detection method as described above to clean the wastewater passage comprises a bathing wastewater tank 1, a heat exchanger 2, a heat source water pump A3, a heat source water pump B4, a hot water tank 5 and a cleaning liquid tank 6. The top of the bathing wastewater tank 1 is connected to the bathing wastewater drainage network through a bathing wastewater pipe E17, the bottom of the side wall of the bathing wastewater tank 1 is connected to the bathing wastewater inlet of the heat exchanger 2 through a bathing wastewater pipe A8, the bathing wastewater outlet of the heat exchanger 2 is connected to the evaporator inlet of the heat source water pump B4 through a bathing wastewater pipe B9, the evaporator outlet of the heat source water pump B4 is connected to the evaporator inlet of the heat source water pump A3 through a bathing wastewater pipe C10, and the evaporator outlet of the heat source water pump A3 is connected to the evaporator outlet through the cleaning liquid tank 6. The bath waste water pipe D11 is connected to the municipal drainage network, the clean water inlet of the heat exchanger 2 is connected to the tap water outlet pipe 12 of the tap water network through the clean water pipe A16, the clean water outlet of the heat exchanger 2 is connected to the condenser inlet of the heat source water pump A3 through the clean water pipe B13, the condenser outlet of the heat source water pump A3 is connected to the condenser inlet of the heat source water pump B4 through the clean water pipe C14, the condenser outlet of the heat source water pump B4 is connected to the upper part of the hot water tank 5 through the clean water pipe D15, the lower part of the side wall of the hot water tank 5 is connected to the domestic hot water supply system, the tap water outlet pipe 12 is also connected to the top of the cleaning liquid tank 6 through the clean water pipe E18, and the bottom of the cleaning liquid tank 6 is also connected to the cleaning liquid tank 6 through the cleaning liquid pipe A19. The bathing wastewater pipe A8 is connected, and the bathing wastewater pipe A8 is connected to the bathing wastewater pipe D11 through the cleaning liquid pipe B20 at the connection point between the cleaning liquid pipe A19 and the bathing wastewater inlet of the heat exchanger 2, and is connected to the cleaning liquid pipe A19 through the cleaning liquid pipe C46 at the connection point between the cleaning liquid pipe B20 and the bathing wastewater inlet of the heat exchanger 2. The bathing wastewater pipe A8 is connected to the cleaning liquid pipe A19 through a valve A23 at the connection point between the bathing wastewater tank 1 and the cleaning liquid pipe A19, a pump A21 is connected between the connection point between the cleaning liquid pipe A19 and the connection point between the cleaning liquid pipe B20, a valve B24 is connected between the connection point between the cleaning liquid pipe B20 and the connection point between the cleaning liquid pipe C46, and a valve B25 is connected between the connection point between the cleaning liquid pipe B20 and the cleaning liquid pipe C46. A flow meter A32 and a temperature sensor A34 are connected in sequence between the connection point 46 and the bathing waste water inlet of the heat exchanger 2 along the direction facing the heat exchanger 2, the bathing waste water pipe B9 is connected with a temperature sensor B35, the bathing waste water pipe D11 is connected between the cleaning liquid pipe B20 and the municipal drainage network connection point with a valve C25, the clean water pipe B13 is connected with a temperature sensor C36, the clean water pipe A16 is connected with a flow meter B33 and a temperature sensor D37, the clean water pipe D15 is connected with a valve D26, the cleaning liquid pipe C46 is connected with a valve F28, and the cleaning liquid pipe A19 is connected in sequence along the direction away from the cleaning liquid tank 6 with a pump B22 and a valve L43.

The cleaning liquid pipe A19 is connected to the cleaning liquid tank 6 through a cleaning liquid pipe D47 at the connection point between the cleaning liquid pipe C46 and the cleaning liquid tank 6, and a valve K42 is provided on the cleaning liquid pipe D47.

The end of the cleaning liquid pipe A19 connected to the cleaning liquid tank 6 is 20 to 30 centimeters higher than the end of the cleaning liquid pipe D47 connected to the cleaning liquid tank 6.

The side wall of the cleaning liquid tank 6 is also provided with a liquid level sensor A38, the side wall of the hot water tank 5 is also provided with a liquid level sensor A39, and the side wall of the bathing waste water tank 1 is also provided with a liquid level sensor B40.

The bathing waste water pipe A8 is provided with a valve G29 between the bathing waste water tank 1 and the valve A23.

An automatic exhaust valve 45 is provided on the bathing wastewater pipe D11 between the connection point with the cleaning liquid pipe B20 and the valve C25.

The tap water outlet pipe 12 is connected to a valve H30.

The cleaning liquid pipe A19 is also provided with a valve I31 between the pump B22 and the cleaning liquid tank 6 .

A check valve 44 is provided on the cleaning liquid pipe A19 between the valve L43 and the connecting point of the cleaning liquid pipe C46.

The clean water pipe E18 is connected to a valve J41.

The valve A23, valve C25, valve E27 and valve F28 are switch-type electric O-type ball valves, valve B24 and valve D26 are regulating electric V-type ball valves, valve G29, valve H30 and valve I31 are stop valves, valve J41, valve K42 and valve L43 are solenoid valves.

The method for cleaning the wastewater passage of the bathing wastewater hot water system as described above comprises the following steps:

或者当满足

、且洗浴废水制热水系统自第一次使用开始正常运行一段时间或自上一次清洗后再次正常运行一段时间后，将热源水泵A3、热源水泵B4和泵A21关闭，并且将流量表A32断电、将阀A23和阀D26关闭，将阀B24、阀C25、阀E27和阀F28打开，从而将洗浴废水管A8位于阀A23与换热器2之间部分、换热器2的洗浴废水通路、洗浴废水管B9、洗浴废水管C10、热源水泵A3的蒸发器、热源水泵B4的蒸发器、洗浴废水管D11、清洗液管B20、清洗液管C46和清洗液管A19位于阀L43与洗浴废水管A8连通处之间部分内的水排空10分钟；1) When satisfied

Or when satisfied

, and after the bathing wastewater hot water system has been operating normally for a period of time since the first use or has been operating normally again for a period of time since the last cleaning, the heat source water pump A3, the heat source water pump B4 and the pump A21 are turned off, the flow meter A32 is powered off, the valve A23 and the valve D26 are closed, and the valves B24, C25, E27 and F28 are opened, so as to drain the water in the portion of the bathing wastewater pipe A8 between the valve A23 and the heat exchanger 2, the bathing wastewater passage of the heat exchanger 2, the bathing wastewater pipe B9, the bathing wastewater pipe C10, the evaporator of the heat source water pump A3, the evaporator of the heat source water pump B4, the bathing wastewater pipe D11, the cleaning liquid pipe B20, the cleaning liquid pipe C46 and the cleaning liquid pipe A19 between the valve L43 and the connection point of the bathing wastewater pipe A8 for 10 minutes;

2) Keep pump B22 started, valve C25 and valve K42 closed, valve L43 opened, so that the cleaning liquid in the cleaning liquid tank 6 is injected into the emptied pipe. When the emptied pipe is filled with cleaning liquid, close pump B22 and valve C25;

3) Close valve B24 and then start pump A21, so that the cleaning liquid in the pipeline circulates in the pipeline to flush the inner wall of the pipeline. The flow direction of the cleaning liquid when it circulates through the bathing wastewater passage of the heat exchanger 2 is opposite to the flow direction of the bathing wastewater when the bathing wastewater hot water system is operating normally;

4) After the cleaning liquid circulates in the pipeline for 30 minutes, turn off pump A21, allow the cleaning liquid to stand in the pipeline for 4 hours, and then repeat step 3);

5) Open B24 and valve C25 again to drain the cleaning liquid in the pipeline for 10 minutes. When the cleaning liquid is completely drained, the cleaning is completed.

6) After cleaning is completed, open valve A23 again, close valves C25, E27 and F28, and connect the power supply to flow meter A32, so that the bathing wastewater hot water system returns to the standby state for normal operation and hot water production.

When the bathing wastewater hot water system has been operating normally for more than or equal to 200 hours since its first use or since its last cleaning, or when the bathing wastewater hot water system has been operating normally for more than or equal to 30 days since its first use or since its last cleaning, the bathing wastewater hot water system shall clean the wastewater passage.

When the level of the cleaning liquid in the cleaning liquid tank 6 reaches or exceeds the height of the liquid level sensor A38, the bathing wastewater hot water system cleans the wastewater passage.

When the hot water level in the hot water tank 5 reaches or exceeds the height of the liquid level sensor B39, the bathing wastewater hot water system cleans the wastewater passage.

When the liquid level of the bathing waste water in the bathing waste water tank 1 reaches or is lower than the height of the liquid level sensor C40, the bathing waste water hot water system cleans the waste water passage.

When the time is between 11pm and 12am or between 0am and 7am, the bathing wastewater hot water system cleans the wastewater passage.

In the step 1), during the emptying period, the valve K42 is opened and the pump B22 is started, so that the cleaning liquid in the cleaning liquid tank 6 circulates and the crystals in the cleaning liquid in the cleaning liquid tank 6 are washed until they are completely dissolved in the cleaning liquid;

When the bathing wastewater hot water system operates normally, valve G29, valve H30 and valve I31 remain normally open.

After the last cleaning and within the cleaning interval, when the bathing wastewater hot water system has been running for 100 hours, the bathing wastewater hot water system still fails to obtain effective scaling detection values, and the bathing wastewater hot water system displays an alarm message that scaling cannot be detected, which facilitates inspection and maintenance of the bathing wastewater direct heating system.

When the liquid level of the cleaning liquid tank 6 is lower than the height of the liquid level sensor A38, the bathing wastewater hot water system displays an alarm message that cleaning agent and replenishing water are required, and cleaning agent is added to the cleaning liquid tank 6 in time, and quantitative water is replenished.

When the bathing wastewater hot water system has been operating normally for more than or equal to 200 hours since its first use or since its last cleaning, or when the bathing wastewater hot water system has been used for more than or equal to 30 days since its first use or since its last cleaning, but the bathing wastewater hot water system cannot perform wastewater channel cleaning for 72 hours because the liquid level in the cleaning liquid tank 6 is lower than the height of the liquid level sensor A38, or the hot water level in the hot water tank 5 is lower than the height of the liquid level sensor B39, or the bathing wastewater level in the bathing wastewater tank 1 is higher than the height of the liquid level sensor C40, or the time is between 7 a.m. and 11 p.m., the bathing wastewater hot water system displays an alarm message that the bathing wastewater hot water system needs to perform wastewater channel cleaning.

When the bathing wastewater hot water system is used normally to produce hot water, pump A21 is started, pump B22 is turned off, valve A23 and valve B24 are opened, and valve E27, valve F28, valve K42 and valve L43 are closed. The ratio of bathing wastewater flow rate to clean water flow rate is controlled to be 1:1 through valve B24 and valve D26.

When the bathing wastewater hot water system avoids crystallization in the cleaning liquid tank 6, the valve K42 is opened and the valve L43 is closed at intervals of 6 hours, and then the pump B22 is started and operated for a period of 3 minutes.

Claims (10)

1. Realize abluent bathing waste water heating water system in waste water route, its characterized in that: comprises a bathing waste water tank (1), a heat exchanger (2), a heat source water pump A (3), a heat source water pump B (4), a hot water tank (5) and a cleaning liquid tank (6), wherein the top of the bathing waste water tank (1) is communicated with a bathing waste water drainage pipe network through a bathing waste water pipe E (17), the bottom of the side wall of a tank body of the bathing waste water tank (1) is communicated with a bathing waste water inlet of the heat exchanger (2) through a bathing waste water pipe A (8), a bathing waste water outlet of the heat exchanger (2) is communicated with an evaporator inlet of the heat source water pump B (4) through a bathing waste water pipe B (9), an evaporator outlet of the heat source water pump B (4) is communicated with an evaporator inlet of the heat source water pump A (3) through a bathing waste water pipe C (10), the liquid outlet of the evaporator of the heat source water pump A (3) is communicated with a municipal drainage pipe network through a bathing waste water pipe D (11), the clear water inlet of the heat exchanger (2) is communicated with the tap water outlet pipe (12) of the tap water pipe network through a clear water pipe A (16), the clear water outlet of the heat exchanger (2) is communicated with the condenser inlet of the heat source water pump A (3) through a clear water pipe B (13), the condenser liquid outlet of the heat source water pump A (3) is communicated with the condenser inlet of the heat source water pump B (4) through a clear water pipe C (14), and the condenser liquid outlet of the heat source water pump B (4) is communicated with the hot water tank (4) through a clear water pipe D (15) 5) The upper portion of the inside of the water tank is communicated, the lower portion of the side wall of the hot water tank (5) is communicated with a domestic hot water supply system, a tap water outlet pipe (12) is communicated with the top of a cleaning liquid tank (6) through a clean water pipe E (18), the bottom of the cleaning liquid tank (6) is communicated with a bathing waste water pipe A (8) through a cleaning liquid pipe A (19), the communicating position of the bathing waste water pipe A (8) with a cleaning liquid pipe A (19) is communicated with a bathing waste water inlet of a heat exchanger (2) through a cleaning liquid pipe B (20), the bathing waste water pipe A (8) is communicated with the bathing waste water inlet of the heat exchanger (2) through a cleaning liquid pipe C (46), a valve A (23) is communicated with the communicating position of the cleaning liquid pipe B (20) and the bathing waste water inlet of the heat exchanger (2), a cleaning liquid pipe A (20) is communicated with the cleaning liquid pipe A (19) through a cleaning liquid pipe C (46), a cleaning liquid pipe A (20) is communicated with a cleaning liquid pipe A (20) through a cleaning liquid pipe A (20), a cleaning liquid pipe A (20) is communicated with a cleaning liquid pipe A (32), and a cleaning liquid pipe A (20), a cleaning liquid pipe A (20) is communicated with a cleaning liquid pipe A) along a cleaning liquid pipe A (20), and a cleaning liquid sensor (32) and a cleaning liquid pipe A2) communicated with a cleaning liquid pipe A2 The device comprises a device A (34), a temperature sensor B (35) is communicated with and arranged on the bathing waste water pipe B (9), a valve C (25) is communicated with and arranged between a cleaning liquid pipe B (20) and a municipal drainage pipe network on the bathing waste water pipe D (11), a temperature sensor C (36) is communicated with and arranged on the cleaning water pipe B (13), a flow meter B (33) and a temperature sensor D (37) are communicated with and arranged on the cleaning water pipe A (16), a valve D (26) is communicated with and arranged on the cleaning water pipe D (15), a valve F (28) is communicated with and arranged on the cleaning liquid pipe C (46), a pump B (22) and a valve L (43) are sequentially communicated and arranged on the cleaning liquid pipe A (19) along the direction far away from the cleaning liquid tank (6), and the valve B (24) and the valve D (26) are both regulating valves;

in the heat exchange process of the heat exchanger (2), the flow ratio of the bathing wastewater flowing through the heat exchanger (2) to the clear water is kept unchanged during the adjustment through the adjustment of the valve B (24) and the valve D (26), the data measured by the flow meter A (32), the flow meter B (33), the temperature sensor A (34), the temperature sensor B (35), the temperature sensor C (36) and the temperature sensor D (37) are respectively recorded, and the initial heat exchange state of the heat exchanger (2) is adjusted through the valve B (24) and the valve D (26) after the data are obtained;

the known heat transfer equation:

；

wherein: k is the total heat transfer coefficient, S is the heat transfer area,

and the thermal equilibrium equation:

；

wherein: q1 is a standard value of flow of bath wastewater flowing through the heat exchanger (2) obtained when a reference test is performed after the initial assembly of the heat exchange system where the heat exchanger (2) is located is completed, q2 is a standard value of flow of clear water flowing through the heat exchanger (2) obtained when the reference test is performed after the initial assembly of the heat exchange system where the heat exchanger (2) is located is completed, c is specific heat of water, t1 is a standard value of temperature before bath wastewater heat exchange when the bath wastewater obtained when the bath wastewater enters the heat exchanger (2) after the reference test is performed after the initial assembly of the heat exchange system where the heat exchanger (2) is located is completed, t2 is a standard value of temperature before bath wastewater heat exchange when the bath wastewater obtained when the clear water enters the heat exchanger (2) after the reference test is performed after the initial assembly of the heat exchange system where the heat exchanger (2) is located, t4 is a standard value of temperature before clear water heat exchange when the clear water enters the heat exchanger (2) after the reference test is performed after the initial assembly of the heat exchange system where the heat exchanger (2) is located is completed, and t3 is a standard value of temperature after clear water after the clear water leaves the heat exchange when the heat exchanger (2) is removed;

the average temperature difference is calculated according to the following formula:

；

at this time, it can be derived from the above three formulas:

；

wherein: specific heat of water

Taking 4187J/(kg), and taking q1' as the flow of the bath wastewater entering the heat exchanger (2) after the detection is finished;

in the heat exchange process of the heat exchanger (2), the valve B (24) and the valve D (26) are adjusted discontinuously for multiple times, so that a measured value q1 'of the flow rate of the bathing wastewater flowing through the heat exchanger (2), a measured value q2' of the flow rate of the clear water flowing through the heat exchanger (2), a measured value t1 'of the temperature of the bathing wastewater before heat exchange, a measured value t2' of the temperature of the bathing wastewater after heat exchange, a measured value t4 'of the temperature of the clear water before heat exchange and a measured value t3' of the temperature of the clear water after heat exchange are respectively and correspondingly measured by the flow meter A (32), the flow meter B (33), the temperature sensor A (34), the temperature sensor B (35), the temperature sensor D (37) and the temperature sensor C (36);

let t2'' be the theoretical value of the temperature of the bath wastewater after heat exchange, t3'' be the theoretical value of the temperature of the clear water after heat exchange,

and then calculating KS according to a formula:

；

and substituting the formula into KS to obtain t 2':

；

then substituting the formula into t2'' to obtain t3'':

comparing t3'' with t3 'and t4', if satisfied

Wherein alpha is a clear water outlet temperature deviation limit value, and the clear water outlet temperature deviation limit value alpha is within the range of 5-15%;

indicating that heat exchanger fouling severely impacted service.

2. A bathing waste water heating water system for realizing waste water passage cleaning according to claim 1, wherein: the cleaning liquid pipe A (19) is positioned between the communicated part of the cleaning liquid pipe C (46) and the cleaning liquid tank (6) and is communicated with the bottom of the side wall of the cleaning liquid tank (6) through a cleaning liquid pipe D (47), and the cleaning liquid pipe D (47) is communicated with a valve K (42); the side wall of the cleaning liquid tank (6) is also provided with a liquid level sensor A (38), the side wall of the hot water tank (5) is also provided with a liquid level sensor A (39), and the side wall of the bathing wastewater tank (1) is also provided with a liquid level sensor B (40).

3. A bathing waste water heating water system for realizing waste water passage cleaning according to claim 1, wherein: when the heat exchange system at heat exchanger (2) place is primarily installed and is carried out the benchmark test after accomplishing, valve D (24) and valve D (26), make the clear water flow that gets into heat exchanger (2) equal with the waste water flow to heat exchange system carries out interval monitoring through convection current table A (32), flow table B (33), temperature sensor A (34), temperature sensor B (35), temperature sensor D (37) and temperature sensor C (36) in a period of time, when each data of monitoring satisfy following index simultaneously:

A. measured value of bath waste water flow

The highest value and the lowest value of the sum are respectively measured with the measured value of the flow of the bathing wastewater>

No deviation of the mean value of (a) exceeds p1; />

B. The deviation between the highest value and the lowest value of the water flow measured value q2 'and the average value of the bath wastewater flow measured values q2' does not exceed p1;

C. the deviation between the average value of the measured bath wastewater flow values q1 'and the average value of the measured bath wastewater flow values q2' is not more than p2;

D. the error between the highest value and the lowest value of the bath wastewater temperature measured values t1 'before heat exchange and the average value of the bath wastewater temperature measured values t1' before heat exchange is not more than t0;

E. the error between the highest value and the lowest value of the temperature measured values t2 'after heat exchange of the bath wastewater and the average value of the temperature measured values t2' after heat exchange of the bath wastewater does not exceed t0;

F. the error between the highest value and the lowest value of the measured temperature values t4 'before heat exchange of the clean water and the average value of the measured temperature values t4' before heat exchange of the clean water is not more than t0;

G. the error between the highest value and the lowest value of the temperature measured values t3 'after the heat exchange of the clean water and the average value of the temperature measured values t3' after the heat exchange of the clean water is not more than t0;

taking the average value of the measured bath waste water flow rate values q1 'measured in the monitoring process as a bath waste water flow rate reference value q1, taking the average value of the measured clear water flow rate values q2' measured in the monitoring process as a clear water flow rate reference value q2, taking the average value of the measured bath waste water temperature values t1 'before heat exchange as a bath waste water temperature reference value t1 before heat exchange, taking the average value of the measured bath waste water temperature values t2' after heat exchange as a bath waste water temperature reference value t2, taking the average value of the measured clear water temperature values t4 'before heat exchange as a bath waste water temperature reference value t4, and taking the average value of the measured clear water temperature values t3' after heat exchange as a clear water temperature reference value t3 after heat exchange.

4. A bathing waste water heating water system for realizing waste water passage cleaning according to claim 3, wherein: the total duration of interval monitoring is within the range of 3 to 10 minutes, and the time of each monitoring interval is less than 10 seconds; the p1 is within the range of 2-5%, the p2 is within the range of 2-5%, and the t0 is within the range of 0.2-0.5 ℃.

5. The method for cleaning the wastewater channel of the bathing wastewater heating water system according to any one of claims 1 to 5, which is characterized by comprising the following steps:

1) When it is satisfied with

Or when satisfied->

When the bath wastewater heating water system is away from the first use and starts to operate normally for a long time or is away from the last cleaning and then operates normally for a long time more than or equal to the cleaning interval time, or when the bath wastewater heating water system is away from the first use and starts to operate for a long time or is away from the last cleaning and then is away from the last cleaning and is equal to or more than the cleaning interval days, the bath wastewater heating water system cleans a wastewater channel, the cleaning interval time is in the range of 150 to 250 hours, and the cleaning interval days are in the range of 20 to 40 days; heat source water pump A (3), heat source water pump B (4)And pump A (21) is closed, the flow meter A (32) is powered off, the valve A (23) and the valve D (26) are closed, and the valve B (24), the valve C (25), the valve E (27) and the valve F (28) are opened, so that the water in the part of the bathing wastewater pipe A (8) between the valve A (23) and the heat exchanger (2), the bathing wastewater passage of the heat exchanger (2), the bathing wastewater pipe B (9), the bathing wastewater pipe C (10), the evaporator of the heat source water pump A (3), the evaporator of the heat source water pump B (4), the bathing wastewater pipe D (11), the cleaning liquid pipe B (20), the cleaning liquid pipe C (46) and the cleaning liquid pipe A (19) are emptied in the part where the valve L (43) is communicated with the bathing wastewater pipe A (8);

2) Keeping the pump B (22) started, closing the valve C (25) and the valve K (42) and opening the valve L (43), so that the cleaning liquid in the cleaning liquid tank (6) is injected into the emptied pipeline, and closing the pump B (22) and the valve C (25) after the emptied pipeline is filled with the cleaning liquid;

3) Closing a valve B (24), and then starting a pump A (21) so as to enable cleaning liquid in the pipeline to circularly flow in the pipeline to wash the inner wall of the pipeline, wherein the flowing direction of the cleaning liquid flowing through a bathing wastewater passage of the heat exchanger (2) when the cleaning liquid circularly flows is opposite to the flowing direction of the bathing wastewater when the bathing wastewater water heating system normally operates;

4) When the cleaning liquid circularly flows in the pipeline for a period of time, closing the pump A (21), standing the cleaning liquid in the pipeline for a period of time, and then repeating the step 3 once;

5) Opening the valve B (24) and the valve C (25) again to drain the cleaning liquid in the pipeline again, and finishing cleaning after the cleaning liquid is completely drained;

6) After the washing is finished, the valve A (23) is opened again, the valve C (25), the valve E (27) and the valve F (28) are closed, the flow meter A (32) is powered on, and therefore the bathing wastewater heating water system is restored to the standby state of normal operation heating water.

6. The method of cleaning a wastewater pathway of a bathing wastewater heating water system of claim 5, wherein: and when the bath wastewater heating water system is away from the first use and starts to operate normally for a long time or is away from the last cleaning and then operates normally for a time longer than or equal to the cleaning interval time, or when the bath wastewater heating water system is away from the first use and starts to clean for a time longer than or equal to the cleaning interval days, the bath wastewater heating water system cleans the wastewater channel.

7. The method of cleaning a wastewater pathway of a bathing wastewater heating water system as set forth in claim 6, wherein: when the liquid level of the cleaning liquid in the cleaning liquid tank (6) reaches or is higher than the height of the liquid level sensor A (38), or when the liquid level of the hot water in the hot water tank (5) reaches or is higher than the height of the liquid level sensor B (39), or when the liquid level of the bathing wastewater in the bathing wastewater tank (1) reaches or is lower than the height of the liquid level sensor C (40), or when the time is between 11 and 12 pm or between 0 and 7 pm, the bathing wastewater heating water system cleans a wastewater passage.

8. The method of cleaning a wastewater pathway of a bathing wastewater heating water system as set forth in claim 5, wherein: in the steps 1) and 5), the emptying time is within the range of 6 to 15 minutes.

9. The method of cleaning a wastewater pathway of a bathing wastewater heating water system as set forth in claim 5, wherein: in the step 3), the washing time is within the range of 20 to 40 minutes.

10. The method of cleaning a wastewater pathway of a bathing wastewater heating water system of claim 5, wherein: in the step 4), the standing and dissolving time is within the range of 3 to 5 hours.

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