CN113701142B - System for heating condensation water by using waste heat of heat medium water of tubular heat exchanger and control mode - Google Patents
System for heating condensation water by using waste heat of heat medium water of tubular heat exchanger and control mode Download PDFInfo
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- CN113701142B CN113701142B CN202110973552.0A CN202110973552A CN113701142B CN 113701142 B CN113701142 B CN 113701142B CN 202110973552 A CN202110973552 A CN 202110973552A CN 113701142 B CN113701142 B CN 113701142B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 397
- 238000009833 condensation Methods 0.000 title claims abstract description 74
- 230000005494 condensation Effects 0.000 title claims abstract description 74
- 238000010438 heat treatment Methods 0.000 title claims abstract description 33
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 73
- 239000003245 coal Substances 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 40
- 230000001276 controlling effect Effects 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 14
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/34—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines and returning condensate to boiler with main feed supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a heating condensation water system by using waste heat of heat medium water of a tubular heat exchanger, which comprises a heat medium water pipe, a condensation water pipe, a steam hydrophobic pipe, a temperature-reducing water pipe, a condensation water heat medium water heat exchanger, a condensation water steam hydrophobic heat exchanger, a steam temperature-reducing pressure-reducing device and a steam hydrophobic tank; the condensed water is connected to the condensed water pipe at the inlet of the condensed water heat medium water heat exchanger, the hot coal water is connected to the heat medium water pipe at the inlet of the condensed water heat medium water heat exchanger, and the heat medium water pipe at the outlet of the condensed water heat medium water heat exchanger is connected to the hot coal water return pipeline. The beneficial effects of the invention are as follows: according to the invention, the condensed water heat medium heat exchanger, the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger are adopted for three-stage heat exchange, and the condensed water is heated by the waste heat of the heat medium water of the tubular heat exchanger and the auxiliary steam to generate the condensed water with the optimal temperature, so that the extraction quantity of the steam turbine is reduced, the generating efficiency of the unit is improved, the recovery of the waste heat of the heat medium water is realized, and the energy-saving effect is achieved.
Description
Technical Field
The invention relates to the technical field of coal-fired units, in particular to a system for heating condensation water by utilizing waste heat of heat medium water of a tubular heat exchanger and a control mode.
Background
The tubular heat exchanger is a main way for solving the adverse effect of high-temperature flue gas emission on power plant equipment and surrounding environment, and is an effective means for improving the dust removal efficiency. The pipe type heat exchanger absorbs high-temperature flue gas heat at the front end of the electric dust collector through a heat medium water medium, reduces the flue gas temperature, improves the dust collection efficiency, and improves the flue gas emission height by releasing the heat medium water heat at the inlet of a chimney. At present, the heat of the flue gas before electric dust removal is not fully utilized, the heat medium water of the tubular heat exchanger only absorbs partial heat, and most of the bypass does not participate in heat absorption of the flue gas.
In view of the foregoing, it is desirable to provide a heat recovery system for heat medium water of a tubular heat exchanger, so as to solve the problem of waste of flue gas heat before electric precipitation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a heating condensation water system and a control mode for the waste heat of heat medium water of a tubular heat exchanger, wherein the waste heat of the heat medium water of the tubular heat exchanger and auxiliary steam are used for heating the condensation water, so that the recovery of the waste heat of the heat medium water is realized, and the energy-saving effect is achieved.
The system comprises a heat medium water pipe, a condensate water pipe, a steam hydrophobic pipe, a temperature reducing water pipe, a condensate water heat medium water heat exchanger, a condensate water steam hydrophobic heat exchanger, a steam temperature and pressure reducing device and a steam hydrophobic tank; the condensed water is connected to a condensed water pipe at the inlet of the condensed water heat medium water heat exchanger, the hot coal water is connected to a heat medium water pipe at the inlet of the condensed water heat medium water heat exchanger, and a heat medium water pipe at the outlet of the condensed water heat medium water heat exchanger is connected to a hot coal water return pipeline; the condensed water pipe at the outlet of the condensed water heat medium water heat exchanger is divided into two paths, one path is connected with the condensed water pipe at the inlet of the condensed water steam heat exchanger, the other path is connected with the condensed water pipe at the inlet of the condensed water steam hydrophobic heat exchanger, and the condensed water pipes at the outlets of the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger are collected and connected into a condensed water return pipeline; the steam pipe is provided with a steam temperature and pressure reducing device, a steam pipe at the outlet of the steam temperature and pressure reducing device is connected to the inlet of the condensed water steam heat exchanger, and a steam drain pipe at the outlet of the condensed water steam heat exchanger is connected to the inlet of the condensed water steam drain heat exchanger; the steam drain pipe of the condensed water steam drain heat exchanger outlet is connected to the inlet of the steam drain box, the temperature reducing water pipe of the steam drain box outlet is provided with a temperature reducing water pump, and the outlet of the temperature reducing water pump is connected to the inlet of the steam temperature reducing and pressure reducing device.
As preferable: the heat medium water pipe at the inlet of the condensed water heat medium water heat exchanger is provided with a heat medium water pipe regulating valve at the inlet of the condensed water heat medium water heat exchanger, and the condensed water pipe at the outlet of the condensed water heat medium water heat exchanger is provided with a condensed water pipe thermal resistor at the outlet of the condensed water heat medium water heat exchanger.
As preferable: and a condensate pipe thermal resistor at the outlet of the condensate steam heat exchanger is arranged on a condensate pipe at the outlet of the condensate steam heat exchanger.
As preferable: the condensate pipe at the inlet of the condensate steam trap is provided with a condensate pipe regulating valve at the inlet of the condensate steam trap, and the steam trap at the outlet of the condensate steam trap is provided with a steam trap thermal resistor at the outlet of the condensate steam trap.
As preferable: the inlet of the steam temperature and pressure reducing device is provided with an inlet regulating valve of the steam temperature and pressure reducing device, and the outlet of the steam temperature and pressure reducing device is provided with an outlet thermal resistor of the steam temperature and pressure reducing device.
As preferable: the steam drain tank inlet is provided with a steam drain tank water supplementing switch valve, the steam drain tank is provided with a steam drain tank liquid level gauge, and the temperature reducing water outlet of the steam drain tank outlet is provided with a temperature reducing water outlet regulating valve.
The control mode of the pipe type heat exchanger heating condensation water system by using the waste heat of the heat medium water comprises the following steps:
S1, forming a PID control loop by a condensation water heat exchanger outlet condensation water pipe thermal resistor and a condensation water heat exchanger inlet heat medium pipe regulating valve, and controlling the opening of the condensation water heat exchanger inlet heat medium pipe regulating valve to realize the temperature control of condensation water at the condensation water heat exchanger outlet; after the preset condensed water temperature value of the outlet of the condensed water heat exchanger is input, controlling the flow of the condensed water of the inlet of the condensed water heat exchanger by a PID controller, further controlling the temperature of the condensed water of the outlet of the condensed water heat exchanger, and displaying the current temperature of the condensed water of the outlet of the condensed water heat exchanger by the thermal resistor of the condensed water pipe of the outlet of the condensed water heat exchanger;
S2, forming a PID control loop by a condensation water pipe thermal resistor at the outlet of the condensation water vapor heat exchanger and an inlet regulating valve of the vapor temperature and pressure reduction device, and controlling the opening of the inlet regulating valve of the vapor temperature and pressure reduction device to realize the temperature control of condensation water at the outlet of the condensation water vapor heat exchanger; after the preset condensed water temperature value of the outlet of the condensed water vapor heat exchanger is input, controlling the steam flow by a PID controller, further controlling the temperature of the condensed water of the outlet of the condensed water vapor heat exchanger, and displaying the current temperature of the condensed water of the outlet of the condensed water vapor heat exchanger through the thermal resistance of the condensed water pipe of the outlet of the condensed water vapor heat exchanger;
S3, the temperature of the thermal resistance of the steam drain pipe at the outlet of the condensed steam drain heat exchanger and a condensed water pipe regulating valve at the inlet of the condensed steam drain heat exchanger form a PID control loop, and the control of the steam drain temperature at the outlet of the condensed steam drain heat exchanger is realized by controlling the opening of the condensed water pipe regulating valve at the inlet of the condensed steam drain heat exchanger; after the preset condensed water steam drainage temperature value of the outlet steam drainage heat exchanger is input, the PID controller is used for controlling the water inflow of condensed water of the condensed water steam drainage heat exchanger, so as to control the drainage temperature of the outlet steam of the condensed water steam drainage heat exchanger, and the current drainage temperature of the outlet steam of the condensed water steam drainage heat exchanger is displayed through the thermal resistor of the outlet steam drainage pipe of the condensed water steam drainage heat exchanger.
Preferably, the method further comprises the step of controlling the temperature of steam at the outlet of the steam temperature and pressure reducing device: the outlet thermal resistor of the steam temperature and pressure reducing device and the outlet regulating valve of the temperature and pressure reducing water pump form a PID control loop, and the opening degree of the outlet regulating valve of the temperature and pressure reducing water pump is controlled to realize the control of the outlet steam temperature of the steam temperature and pressure reducing device; after the preset steam temperature value of the outlet of the steam temperature and pressure reducing device is input, the PID controller is used for controlling the water inflow of the temperature-reducing water, so as to control the temperature of the outlet steam of the steam temperature and pressure reducing device, and the current temperature of the outlet steam of the steam temperature and pressure reducing device is displayed through the outlet thermal resistor of the steam temperature and pressure reducing device.
Preferably, the control of the level of the steam hydrophobic tank is also included: when the steam hydrophobic tank liquid level meter displays a low liquid level, a steam hydrophobic tank water supplementing switch valve is opened; when the steam hydrophobic tank liquid level meter displays a high liquid level, the steam hydrophobic tank water supplementing switch valve is closed.
The beneficial effects of the invention are as follows: according to the invention, the condensed water heat medium heat exchanger, the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger are adopted for three-stage heat exchange, and the condensed water is heated by the waste heat of the heat medium water of the tubular heat exchanger and the auxiliary steam to generate the condensed water with the optimal temperature, so that the extraction quantity of the steam turbine is reduced, the generating efficiency of the unit is improved, the recovery of the waste heat of the heat medium water is realized, and the energy-saving effect is achieved.
Drawings
FIG. 1 is a schematic diagram of a heating condensate system using waste heat of heat medium water in a tubular heat exchanger according to a first embodiment;
Fig. 2 is a schematic diagram of control of a regulator valve according to the third embodiment.
Reference numerals illustrate: the device comprises a heating medium water pipe 1, a condensation water pipe 2, a steam pipe 3, a steam hydrophobic pipe 4, a temperature reducing water pipe 5, a condensation water heating medium water heat exchanger 11, a condensation water steam heat exchanger 12, a condensation water steam hydrophobic heat exchanger 13, a steam temperature and pressure reducing device 14, a steam hydrophobic tank 15, a temperature reducing water pump 16, a condensation water heating medium water heat exchanger inlet heat medium water pipe regulating valve 21, a steam temperature and pressure reducing device inlet regulating valve 22, a condensation water steam hydrophobic heat exchanger inlet condensate water pipe regulating valve 23, a temperature reducing water pump outlet regulating valve 24, a steam hydrophobic tank water supplementing switch valve 25, a condensation water heating medium heat exchanger outlet condensate water pipe thermal resistor 31, a condensation water steam heat exchanger outlet condensate water pipe thermal resistor 32, a steam temperature and pressure reducing device outlet thermal resistor 33, a condensation water steam hydrophobic heat exchanger outlet steam hydrophobic pipe thermal resistor 34 and a steam hydrophobic tank liquid level meter 35.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
The first embodiment of the application provides a heating condensation water system by using waste heat of heat medium water of a tubular heat exchanger, which comprises the following components: a heating medium water pipe 1, a condensation water pipe 2, a steam pipe 3, a steam hydrophobic pipe 4, a temperature reducing water pipe 5, a condensation water heating medium water heat exchanger 11, a condensation water steam heat exchanger 12, a condensation water steam hydrophobic heat exchanger 13, a steam temperature and pressure reducing device 14 and a steam hydrophobic tank 15; the condensed water is connected to a condensed water pipe 2 at the inlet of the condensed water heat medium water heat exchanger 11, the hot coal water is connected to a heat medium water pipe 1 at the inlet of the condensed water heat medium water heat exchanger 11, and the heat medium water pipe 1 at the outlet of the condensed water heat medium water heat exchanger 11 is connected to hot coal water backwater; the condensate pipe 2 at the outlet of the condensate heat medium water heat exchanger 11 is divided into two paths, one path is connected with the condensate pipe 2 at the inlet of the condensate water steam heat exchanger 12, the other path is connected with the condensate pipe 2 at the inlet of the condensate water steam hydrophobic heat exchanger 13, and the condensate pipes 2 at the outlets of the condensate water steam heat exchanger 12 and the condensate water steam hydrophobic heat exchanger 13 are gathered and connected into a condensate water return pipeline; the steam pipe 3 is provided with a steam temperature and pressure reducing device 14, the steam pipe 3 at the outlet of the steam temperature and pressure reducing device 14 is connected to the inlet of the condensed water steam heat exchanger 12, and the steam hydrophobic pipe 4 at the outlet of the condensed water steam heat exchanger 12 is connected to the inlet of the condensed water steam hydrophobic heat exchanger 13; the steam hydrophobic pipe 4 at the outlet of the condensed steam hydrophobic heat exchanger 13 is connected to the inlet of the steam hydrophobic tank 15, the temperature-reducing water pipe 5 at the outlet of the steam hydrophobic tank 15 is provided with a temperature-reducing water pump 16, and the outlet of the temperature-reducing water pump 16 is connected to the inlet of the steam temperature-reducing pressure-reducing device 14.
The heat medium water pipe 1 and the condensate water pipe 2 exchange heat through the condensate water heat medium water heat exchanger 11, the heat medium water pipe 1 at the inlet of the condensate water heat medium water heat exchanger 11 is provided with a condensate water heat medium water heat exchanger inlet heat medium water pipe regulating valve 21, and the condensate water pipe 2 at the outlet of the condensate water heat medium water heat exchanger 11 is provided with a condensate water heat pipe thermal resistor 31 at the outlet of the condensate water heat medium water heat exchanger.
The condensate pipe 2 and the steam pipe 3 exchange heat through the condensate steam heat exchanger 12, and a condensate pipe thermal resistor 32 at the outlet of the condensate steam heat exchanger is arranged on the condensate pipe 2 at the outlet of the condensate steam heat exchanger 12.
The condensate water of the condensate pipe 2 and the steam hydrophobic pipe 4 exchange heat through the condensate water steam hydrophobic heat exchanger 13, the condensate pipe 2 at the inlet of the condensate water steam hydrophobic heat exchanger 13 is provided with a condensate water pipe regulating valve 23 at the inlet of the condensate water steam hydrophobic heat exchanger, and the steam hydrophobic pipe 4 at the outlet of the condensate water steam hydrophobic heat exchanger 13 is provided with a condensate water steam hydrophobic heat exchanger outlet steam hydrophobic pipe thermal resistor 34.
The inlet of the steam temperature and pressure reducing device 14 is provided with a steam temperature and pressure reducing device inlet regulating valve 22, and the outlet of the steam temperature and pressure reducing device 14 is provided with a steam temperature and pressure reducing device outlet thermal resistor 33.
The steam water drain tank 15 water supplementing pipe (namely, the steam water drain pipe 4 at the inlet) is provided with a steam water drain tank water supplementing switch valve 25, the steam water drain tank 15 is provided with a steam water drain tank liquid level gauge 35, and the outlet of the temperature reducing water pump 16 at the outlet of the steam water drain tank 15 is provided with a temperature reducing water pump outlet regulating valve 24.
Example two
The working principle of the pipe type heat exchanger heating condensation water system by using the heat medium water waste heat is as follows:
The condensation water from the factory is connected to the condensation water inlet pipeline of the condensation water heat exchanger 11, after heat exchange with the heat medium water, the condensation water outlet pipeline of the condensation water heat exchanger 11 is divided into two paths, one path is connected with the condensation water inlet pipeline of the condensation water vapor heat exchanger 12, the other path is connected with the condensation water inlet pipeline of the condensation water vapor hydrophobic heat exchanger 13, after heat exchange, the condensation water vapor heat exchanger 12 and the condensation water outlet pipeline of the condensation water vapor hydrophobic heat exchanger 13 are integrated and then connected into the condensation water return pipeline. The steam is subjected to temperature and pressure reduction through the steam temperature and pressure reduction device 14 and then is connected to a steam inlet pipeline of the condensed water steam heat exchanger 12, after heat exchange with condensed water, steam drainage is connected to a steam drainage inlet pipeline of the condensed water steam drainage heat exchanger 13, after heat exchange with the condensed water, steam condensate water is discharged, and when the liquid level of the steam hydrophobic tank 15 is low, a steam hydrophobic tank water supplementing switch valve 25 is opened for water supplementing.
Under the design working condition, the condensed water heat medium water heat exchanger system and the heat medium circulating water of the original tubular heat exchanger are operated in parallel. About 40% of the heating medium water goes to the tube type heat exchanger flue gas heater to raise the temperature of the clean flue gas and discharge, and the rest 60% of the heating medium water passes through the condensation water heating medium water heat exchanger 11 to lower the temperature of the heating medium water to about 70 ℃, and the temperature of the condensation water rises to the design temperature.
The superheated steam from the unit heats the condensed water at the outlet of the condensed water heat medium water heat exchanger 11 through the condensed water steam heat exchanger 12, and the steam condensed water is discharged to the steam hydrophobic tank 15 or the condensed water tank after heat is further recovered through the condensed water steam hydrophobic heat exchanger 13. And heating by hot steam and recovering the waste heat of the steam condensate water, wherein the temperature of the condensate water reaches the required temperature. In order to ensure the heat exchange effect of the condensed water vapor heat exchanger 12, a set of vapor temperature and pressure reducing device 14 is arranged, and the superheated vapor enters the condensed water vapor heat exchanger 12 after being subjected to temperature and pressure reduction.
Example III
The third embodiment of the application provides a control mode of a heating condensation water system by using waste heat of heat medium water of a tubular heat exchanger, which comprises the following steps:
s1, the temperature of a condensate pipe thermal resistor 31 at the outlet of the condensate heat exchanger and a heat pipe regulating valve 21 at the inlet of the condensate heat exchanger form a PID control loop, and the temperature control of the condensate water at the outlet of the condensate heat exchanger 11 is realized by controlling the opening of the heat pipe regulating valve 21 at the inlet of the condensate heat exchanger. After the preset condensed water temperature value of the outlet of the condensed water heat exchanger 11 is input, the PID controller controls the flow of the condensed water of the inlet of the condensed water heat exchanger, so as to control the temperature of the condensed water of the outlet of the condensed water heat exchanger 11, and the current condensed water temperature of the outlet of the condensed water heat exchanger 11 is displayed through the thermal resistor 31 of the condensed water pipe of the outlet of the condensed water heat exchanger.
S2, the temperature of a condensate pipe thermal resistor 32 at the outlet of the condensate steam heat exchanger and the inlet regulating valve 22 of the steam temperature and pressure reduction device form a PID control loop, and the control of the temperature of the condensate water at the outlet of the condensate steam heat exchanger 12 is realized by controlling the opening of the inlet regulating valve 22 of the steam temperature and pressure reduction device. After the preset condensed water temperature value of the outlet of the condensed water vapor heat exchanger 12 is input, the PID controller controls the steam flow, thereby controlling the condensed water temperature of the outlet of the condensed water vapor heat exchanger 12, and displaying the current condensed water temperature of the outlet of the condensed water vapor heat exchanger 12 through the condensed water pipe thermal resistor 32 of the outlet of the condensed water vapor heat exchanger.
S3, the temperature of the steam drain pipe thermal resistor 34 at the outlet of the condensed steam drain heat exchanger and the condensed water pipe regulating valve 23 at the inlet of the condensed steam drain heat exchanger form a PID control loop, and the control of the steam drain temperature at the outlet of the condensed steam drain heat exchanger 13 is realized by controlling the opening of the condensed water pipe regulating valve 23 at the inlet of the condensed steam drain heat exchanger. After the preset steam drainage temperature value of the outlet of the condensed steam drainage heat exchanger 13 is input, the PID controller controls the inflow water flow of condensed water of the condensed steam drainage heat exchanger 13, so as to control the steam drainage temperature of the outlet of the condensed steam drainage heat exchanger 13, and the current steam drainage temperature of the outlet of the condensed steam drainage heat exchanger 13 is displayed through the steam drainage pipe thermal resistor 34 of the outlet of the condensed steam drainage heat exchanger.
The temperature of the outlet thermal resistor 33 of the steam temperature-reducing and pressure-reducing device and the outlet regulating valve 24 of the temperature-reducing water pump form a PID control loop, and the opening degree of the outlet regulating valve 24 of the temperature-reducing water pump is controlled to realize the control of the temperature of the steam at the outlet of the steam temperature-reducing and pressure-reducing device 14. After the input of the preset steam temperature value of the outlet of the steam temperature and pressure reducing device 14, the PID controller controls the water inflow of the temperature-reducing water, thereby controlling the steam temperature of the outlet of the steam temperature and pressure reducing device 14, and displaying the current steam temperature of the outlet of the steam temperature and pressure reducing device 14 through the steam temperature and pressure reducing device outlet thermal resistor 33.
When the steam drain tank level gauge 35 shows a low level, the steam drain tank water replenishing switch valve 25 is opened; when the steam trap level gauge 35 shows a high level, the steam trap make-up switch valve 25 is closed.
Claims (9)
1.A heat medium water waste heat heating condensation water system of a tubular heat exchanger is characterized in that: the device comprises a heating medium water pipe (1), a condensation water pipe (2), a steam pipe (3), a steam hydrophobic pipe (4), a temperature-reducing water pipe (5), a condensation water heating medium water heat exchanger (11), a condensation water steam heat exchanger (12), a condensation water steam hydrophobic heat exchanger (13), a steam temperature-reducing pressure-reducing device (14) and a steam hydrophobic tank (15); the condensed water is connected to a condensed water pipe (2) at the inlet of a condensed water heat medium water heat exchanger (11), the hot coal water is connected to a heat medium water pipe (1) at the inlet of the condensed water heat medium water heat exchanger (11), and a heat medium water pipe (1) at the outlet of the condensed water heat medium water heat exchanger (11) is connected to a hot coal water return pipeline; the condensation water pipe (2) at the outlet of the condensation water heat medium heat exchanger (11) is divided into two paths, one path is connected with the condensation water pipe (2) at the inlet of the condensation water steam heat exchanger (12), the other path is connected with the condensation water pipe (2) at the inlet of the condensation water steam hydrophobic heat exchanger (13), and the condensation water pipes (2) at the outlets of the condensation water steam heat exchanger (12) and the condensation water steam hydrophobic heat exchanger (13) are gathered and connected into a condensation water return pipeline; the steam pipe (3) is provided with a steam temperature and pressure reducing device (14), the steam pipe (3) at the outlet of the steam temperature and pressure reducing device (14) is connected to the inlet of the condensed water steam heat exchanger (12), and the steam hydrophobic pipe (4) at the outlet of the condensed water steam heat exchanger (12) is connected to the inlet of the condensed water steam hydrophobic heat exchanger (13); the steam hydrophobic pipe (4) at the outlet of the condensed steam hydrophobic heat exchanger (13) is connected to the inlet of the steam hydrophobic tank (15), the temperature-reducing water pump (16) is arranged on the temperature-reducing water pipe (5) at the outlet of the steam hydrophobic tank (15), and the outlet of the temperature-reducing water pump (16) is connected to the inlet of the steam temperature-reducing pressure-reducing device (14).
2. The tubular heat exchanger heat medium water waste heat heating condensate system of claim 1, wherein: the heat medium pipe (1) at the inlet of the condensed water heat medium heat exchanger (11) is provided with a condensed water heat medium heat exchanger inlet heat medium pipe regulating valve (21), and the condensed water pipe (2) at the outlet of the condensed water heat medium heat exchanger (11) is provided with a condensed water pipe thermal resistor (31) at the outlet of the condensed water heat medium heat exchanger.
3. The tubular heat exchanger heat medium water waste heat heating condensate system of claim 1, wherein: the condensate pipe (2) at the outlet of the condensate steam heat exchanger (12) is provided with a condensate pipe thermal resistor (32) at the outlet of the condensate steam heat exchanger.
4. The tubular heat exchanger heat medium water waste heat heating condensate system of claim 1, wherein: the condensation water pipe (2) at the inlet of the condensation water vapor drainage heat exchanger (13) is provided with a condensation water pipe regulating valve (23) at the inlet of the condensation water vapor drainage heat exchanger, and the steam drainage pipe (4) at the outlet of the condensation water vapor drainage heat exchanger (13) is provided with a steam drainage pipe thermal resistor (34) at the outlet of the condensation water vapor drainage heat exchanger.
5. The tubular heat exchanger heat medium water waste heat heating condensate system of claim 1, wherein: the inlet of the steam temperature and pressure reducing device (14) is provided with a steam temperature and pressure reducing device inlet regulating valve (22), and the outlet of the steam temperature and pressure reducing device (14) is provided with a steam temperature and pressure reducing device outlet thermal resistor (33).
6. The tubular heat exchanger heat medium water waste heat heating condensate system of claim 1, wherein: a steam hydrophobic tank water supplementing switch valve (25) is arranged on a steam hydrophobic pipe (4) at an inlet of a steam hydrophobic tank (15), a steam hydrophobic tank liquid level gauge (35) is arranged on the steam hydrophobic tank (15), and a temperature reducing water pump (16) at an outlet of the steam hydrophobic tank (15) is provided with a temperature reducing water pump outlet regulating valve (24).
7. A control method of a heat medium water waste heat heating condensation water system of a tubular heat exchanger according to claim 1, comprising the steps of:
S1, forming a PID control loop by a condensate pipe thermal resistor (31) at the outlet of the condensate heat exchanger and a condensate pipe regulating valve (21) at the inlet of the condensate heat exchanger, and controlling the temperature of condensate at the outlet of the condensate heat exchanger (11) by controlling the opening of the condensate pipe regulating valve (21) at the inlet of the condensate heat exchanger; after the preset condensed water temperature value of the outlet of the condensed water heat exchanger (11) is input, controlling the inlet heat medium water flow of the condensed water heat exchanger by a PID controller, further controlling the temperature of the condensed water of the outlet of the condensed water heat exchanger (11), and displaying the current condensed water temperature of the outlet of the condensed water heat exchanger (11) through a condensed water pipe thermal resistor (31) of the outlet of the condensed water heat exchanger;
S2, forming a PID control loop by a condensate pipe thermal resistor (32) at the outlet of the condensate steam heat exchanger and an inlet regulating valve (22) of the steam temperature and pressure reduction device, and controlling the temperature of condensate water at the outlet of the condensate steam heat exchanger (12) by controlling the opening of the inlet regulating valve (22) of the steam temperature and pressure reduction device; after the preset condensed water temperature value of the outlet of the condensed water vapor heat exchanger (12) is input, controlling the steam flow by a PID controller, further controlling the temperature of the condensed water of the outlet of the condensed water vapor heat exchanger (12), and displaying the current temperature of the condensed water of the outlet of the condensed water vapor heat exchanger (12) through a condensed water pipe thermal resistor (32) of the outlet of the condensed water vapor heat exchanger;
S3, forming a PID control loop by the temperature of a steam drain pipe thermal resistor (34) at the outlet of the condensed steam drain heat exchanger and a condensed water pipe regulating valve (23) at the inlet of the condensed steam drain heat exchanger, and controlling the steam drain temperature at the outlet of the condensed steam drain heat exchanger (13) by controlling the opening of the condensed water pipe regulating valve (23) at the inlet of the condensed steam drain heat exchanger; after the preset steam drainage temperature value of the outlet of the condensed steam drainage heat exchanger (13) is input, the PID controller is used for controlling the inflow water flow of condensed water of the condensed steam drainage heat exchanger (13), so as to control the steam drainage temperature of the outlet of the condensed steam drainage heat exchanger (13), and the current steam drainage temperature of the outlet of the condensed steam drainage heat exchanger (13) is displayed through the steam drainage pipe thermal resistor (34) of the outlet of the condensed steam drainage heat exchanger.
8. The control method of the heating condensation water system by using the heat medium water waste heat of the tubular heat exchanger according to claim 7, further comprising the step of controlling the temperature of steam at the outlet of the steam temperature-reducing and pressure-reducing device: the outlet thermal resistor (33) of the steam temperature and pressure reducing device and the temperature and pressure reducing water outlet regulating valve (24) form a PID control loop, and the outlet steam temperature of the steam temperature and pressure reducing device (14) is controlled by controlling the opening of the temperature and pressure reducing water outlet regulating valve (24); after the preset steam temperature value of the outlet of the steam temperature and pressure reducing device (14) is input, the PID controller controls the inflow flow of the temperature-reduced water, further controls the temperature of the steam at the outlet of the steam temperature and pressure reducing device (14), and displays the current temperature of the steam at the outlet of the steam temperature and pressure reducing device (14) through the outlet thermal resistor (33) of the steam temperature and pressure reducing device.
9. The control method of a heating condensate system by heat of heat transfer medium water of claim 7, further comprising controlling a liquid level of a steam hydrophobic tank: a steam hydrophobic tank water supplementing switch valve (25) is arranged on a steam hydrophobic pipe (4) at an inlet of the steam hydrophobic tank (15), and when a steam hydrophobic tank liquid level meter (35) displays a low liquid level, the steam hydrophobic tank water supplementing switch valve (25) is opened; when the steam hydrophobic tank liquid level meter (35) displays a high liquid level, the steam hydrophobic tank water supplementing switch valve (25) is closed.
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