CN221483657U - Boiler flue gas waste heat recovery system - Google Patents
Boiler flue gas waste heat recovery system Download PDFInfo
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- CN221483657U CN221483657U CN202322916876.8U CN202322916876U CN221483657U CN 221483657 U CN221483657 U CN 221483657U CN 202322916876 U CN202322916876 U CN 202322916876U CN 221483657 U CN221483657 U CN 221483657U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000003546 flue gas Substances 0.000 title claims abstract description 112
- 239000002918 waste heat Substances 0.000 title claims abstract description 58
- 238000011084 recovery Methods 0.000 title claims abstract description 42
- 239000007921 spray Substances 0.000 claims abstract description 165
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- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 41
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 80
- 239000003814 drug Substances 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 17
- 239000003595 mist Substances 0.000 claims description 14
- 239000012670 alkaline solution Substances 0.000 claims description 8
- 230000003472 neutralizing effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 7
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- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The embodiment of the application provides a boiler flue gas waste heat recovery system, which relates to the technical field of boiler thermodynamic system equipment, and comprises a boiler, a desulfurizing tower, a spray tower and a heat pump; the boiler is connected with the desulfurizing tower through a first pipeline, and flue gas generated by the boiler enters the desulfurizing tower through the first pipeline; the desulfurization tower is connected with the spray tower through a second pipeline, and flue gas subjected to wet desulfurization by the desulfurization tower enters the spray tower through the second pipeline, and the spray tower is used for carrying out spray heat exchange on the flue gas entering the spray tower; the spray tower is connected with the heat pump through a third pipeline, spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters the heat pump through the third pipeline, and the heat pump is used for absorbing and utilizing heat of the spray liquid. The embodiment of the application can recycle the waste heat of the flue gas after wet desulfurization, avoid waste of waste heat energy of the flue gas caused by direct emptying and save energy.
Description
Technical Field
The application relates to the technical field of boiler thermodynamic system equipment, in particular to a boiler flue gas waste heat recovery system.
Background
Along with the continuous improvement of the emission requirements of China on the atmospheric pollutants, the environmental protection treatment technology of related industries is also continuously developed. In the power industry, the thermal efficiency of conventional power plant boilers is about 80%, the smoke loss is about 8% at a smoke temperature of 140 °, and a significant portion of the heat in the smoke is not utilized. In particular, the flue gas after wet desulfurization contains a large amount of water vapor, the flue gas is basically in a wet saturated state, the wet saturated flue gas contains a large amount of water vapor latent heat, and the waste of waste heat energy of the flue gas is caused by direct emptying.
Disclosure of utility model
The embodiment of the application provides a boiler flue gas waste heat recovery system, which can be used for recovering waste heat of flue gas after wet desulfurization, so that waste of flue gas waste heat energy caused by direct emptying is avoided, and energy is saved.
The embodiment of the application provides a boiler flue gas waste heat recovery system, which comprises a boiler, a desulfurizing tower, a spray tower and a heat pump;
the boiler is connected with the desulfurizing tower through a first pipeline, and flue gas generated by the boiler enters the desulfurizing tower through the first pipeline;
The desulfurization tower is connected with the spray tower through a second pipeline, and flue gas subjected to wet desulfurization by the desulfurization tower enters the spray tower through the second pipeline, and the spray tower is used for carrying out spray heat exchange on the flue gas entering the spray tower;
The spray tower is connected with the heat pump through a third pipeline, spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters the heat pump through the third pipeline, and the heat pump is used for absorbing heat of the spray liquid for utilization.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the spray tower is provided with the demister, and the demister is used for demisting flue gas in the spray tower before the flue gas leaves the spray tower.
The boiler flue gas waste heat recovery system provided by the embodiment of the application further comprises a demister spray-washing device, wherein the demister spray-washing device is used for washing the demister.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the demister spray washing device comprises a demister washing pump and a demister washing nozzle arranged in the spray tower, wherein a bottom circulating water tank of the spray tower is connected with the demister washing nozzle through a fourth pipeline, and the demister washing pump is arranged on the fourth pipeline.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters the spray tower lower water tank, the spray tower lower water tank is connected with the heat pump through the third pipeline, and the boiler flue gas waste heat recovery system further comprises a dosing device, wherein the dosing device is used for neutralizing the spray liquid entering the spray tower lower water tank.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the dosing equipment comprises a medicine box and a dosing pump, the medicine box is connected with the dosing pump, the dosing pump is connected with the lower water tank of the spray tower, the medicine box is used for storing alkaline solution, and the dosing pump is used for conveying the alkaline solution in the medicine box into the lower water tank of the spray tower and carrying out neutralization treatment on the spray liquid in the lower water tank of the spray tower.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the medicine box is connected with the medicine adding pump through a fifth pipeline, and the fifth pipeline is provided with a medicine adding electric valve.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, a first PH sensor is arranged at the circulating water outlet of the lower water tank of the spray tower, and the first PH sensor is used for detecting the PH value of the spray liquid from the circulating water outlet.
In the boiler flue gas waste heat recovery system provided by the embodiment of the application, the circulating water inlet of the lower water tank of the spray tower is provided with the second PH sensor, and the second PH sensor is used for detecting the PH value of the spray liquid before entering the lower water tank of the spray tower from the circulating water inlet.
The system for recovering the waste heat of the boiler flue gas further comprises a display device, wherein the display device is simultaneously connected with the first PH sensor and the second PH sensor in a communication mode, and the display device is used for displaying PH values transmitted by the first PH sensor and the second PH sensor.
The boiler flue gas waste heat recovery system provided by the embodiment of the application comprises a boiler, a desulfurizing tower, a spray tower and a heat pump; the boiler is connected with the desulfurizing tower through a first pipeline, and flue gas in the boiler enters the desulfurizing tower through the first pipeline for desulfurization; the desulfurization tower is connected with the spray tower through a second pipeline, and flue gas subjected to wet desulfurization by the desulfurization tower enters the spray tower through the second pipeline, and spray heat exchange is carried out on the flue gas entering the flue gas through the spray tower; the spray tower is connected with the heat pump through a third pipeline, and spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters the heat pump through the third pipeline, so that heat of the spray liquid is absorbed by the heat pump for utilization. According to the embodiment of the application, the flue gas after desulfurization by the desulfurization tower enters the spray tower through the second pipeline, and the spray liquid sprayed by the spray tower exchanges heat with the flue gas, so that the flue gas waste heat can be recovered, and the waste of flue gas waste heat energy caused by directly evacuating the flue gas is avoided; and then the heated spray liquid is conveyed into the heat pump through the third pipeline, and the heat of the spray liquid is absorbed by the heat pump for utilization, so that energy sources can be saved. Therefore, the embodiment of the application can recycle the waste heat of the flue gas after wet desulfurization, avoid waste of waste heat energy of the flue gas caused by direct emptying, save energy, reduce the operation cost for enterprises and improve the profitability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a boiler flue gas waste heat recovery system according to an embodiment of the present application.
Reference numerals illustrate:
10-boiler 20-desulfurizing tower 30-spray tower
40-Heat pump 1000-boiler flue gas waste heat recovery system
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiment of the application provides a boiler flue gas waste heat recovery system. Referring to fig. 1, a boiler flue gas waste heat recovery system 1000 includes a boiler 10, a desulfurizing tower 20, a spray tower 30, and a heat pump 40.
The boiler 10 is an energy conversion device, and the energy input to the boiler 10 is chemical energy and electric energy in fuel, and the boiler 10 outputs steam, high temperature water or an organic heat carrier with certain heat energy. During operation, the boiler 10 generates flue gas.
In some embodiments, the boiler 10 is connected to the desulfurizing tower 20 via a first conduit, and flue gas generated by the boiler 10 enters the desulfurizing tower 20 via the first conduit.
The desulfurization tower 20 is a tower apparatus for desulfurizing industrial waste gas. The desulfurizing tower 20 is most widely used in the initial construction of granite, which utilizes the principle of water film desulfurization and dust removal, also known as a granite water film desulfurization dust remover, or a granite water film desulfurization dust remover.
Wherein, the flue gas generated by the boiler 10 enters the desulfurizing tower 20 through a first pipeline, and then the desulfurizing tower 20 carries out wet desulfurization treatment on the flue gas entering the desulfurizing tower.
The desulfurizing tower 20 is connected with the spray tower 30 through a second pipeline, and the flue gas subjected to wet desulfurization by the desulfurizing tower 20 enters the spray tower 30 through the second pipeline, and the spray tower 30 is used for carrying out spray heat exchange on the flue gas entering the desulfurizing tower.
The reaction temperature in the wet desulfurization process is lower than the dew point, so that the desulfurized flue gas can be discharged after reheating. Because of the gas-liquid reaction, the desulfurization reaction speed is high, the efficiency is high, the utilization rate of desulfurization additives is high, for example, when lime is used as a desulfurizing agent, the desulfurization rate of 90 percent can be achieved when Ca/S=1, and the method is suitable for flue gas desulfurization of large-scale coal-fired power plants. The flue gas after wet desulfurization contains a large amount of water vapor, the flue gas is basically in a wet saturated state, and the wet saturated flue gas contains a large amount of water vapor latent heat.
Wherein, spray tower 30 sprays spray liquid and carries out direct contact heat transfer with the flue gas that goes through wet flue gas desulfurization, and flue gas temperature drops to 30 ℃ from 50 ℃, and spray liquid's temperature rises to 35 ℃ from 25 ℃ to can retrieve the flue gas waste heat.
The spray tower 30 is connected with the heat pump 40 through a third pipeline, the spray liquid sprayed out of the spray tower 30 exchanges heat with the flue gas and then enters the heat pump 40 through the third pipeline, and the heat pump 40 is used for absorbing and utilizing the heat of the spray liquid.
The Heat Pump (Heat Pump) 40 is a device for transferring Heat energy from a low-level Heat source to a high-level Heat source, and the Heat Pump 40 absorbs Heat of the shower liquid and converts the Heat energy into high-level Heat energy for use. For example, 7500t/h45 ℃ heat supply network water is divided into 2 paths, one path of water is heated to 65 ℃ through the heat pump 40, the remaining water is heated to 65 ℃ through the original heating system, and the two paths are combined to supply heat to the outside.
In some embodiments, a mist eliminator is provided in the spray tower 30 for eliminating mist from the flue gas in the spray tower before the flue gas exits the spray tower 30.
The demister has the function of capturing fog particles and slurry drops carried by flue gas in the spray absorption process. The efficiency of the mist eliminator is related not only to its own structure but also to the severity and particle size of the mist particles, and the nozzle atomization particle size is related to the viscosity of the absorption liquid, the force of the spray claw and the nozzle structure. The demister performance and the fog particle diameter are matched, so that a good demisting effect can be achieved. The demister nozzle is mainly made of high-quality plastics, has extremely high wear resistance and long service life.
In some embodiments, the boiler flue gas waste heat recovery system 1000 further includes a mist eliminator spray device for cleaning the mist eliminator.
Wherein, when spray column 30 long-term operation, the inside defroster can have the dust, carries out self-cleaning to the defroster through configuration defroster belt cleaning device, can detach the dust on the defroster.
The pressure transmitters are arranged in front of and behind the demister, and the operating condition of the demister can be checked through the pressure transmitters in front of and behind the demister so as to clean the demister.
After the spray tower 30 operates for a period of time, along with dust accumulation on the demister, the flow resistance of smoke at two sides of the demister is increased, so that the normal operation of a smoke discharging system and the waste heat recovery capacity can be influenced, and back flushing of the demister is required to be timely performed according to the pressure difference between the front and the rear of the demister, so that the normal operation of the spray tower 30 is recovered.
In some embodiments, the mist eliminator spray apparatus includes a mist eliminator rinse pump and a mist eliminator rinse nozzle disposed within the spray tower, the mist eliminator rinse pump disposed on the fourth conduit being connected between the bottom circulation tank of the spray tower 30 and the mist eliminator rinse nozzle through the fourth conduit.
Wherein, when washing the defroster, draw circulating water in the bottom circulation pond from spray column 30, carry the defroster washing nozzle in the spray column 30 to via the defroster washing pump, defroster washing nozzle spun water smoke is with the laying dust sanitization on the defroster.
Wherein, the spray liquid from the heat pump 40 enters the bottom circulation tank of the spray tower 30, thereby recycling the spray liquid and saving resources.
In some embodiments, the spray liquid sprayed by the spray tower 30 exchanges heat with the flue gas and then enters the lower water tank of the spray tower, the lower water tank of the spray tower is connected with the heat pump 40 through a third pipeline, and the boiler flue gas waste heat recovery system 1000 further comprises a dosing device, wherein the dosing device is used for neutralizing the spray liquid entering the lower water tank of the spray tower.
The spray liquid has acidity after heat exchange with the flue gas, and after the spray liquid falls to the lower water tank of the spray tower, the circulating water in the lower water tank of the spray tower is acidic, so that the neutralization treatment is needed to neutralize the PH value in the circulating water in order to avoid acidic corrosion to equipment and pipelines when the system is operated. Wherein, the dosing point is arranged at the lower water tank of the spray tower, thereby ensuring the protection of the connected systems such as the heat pump 40 and the like and the protection of the factory water replenishing system.
The medicine adding equipment adopts a PLC automatic control system, a communication interface is reserved, the communication protocol is a standard Modbus protocol, and the PH value can be uploaded in real time for monitoring by an automatic control system.
In some embodiments, the dosing device comprises a medicine box and a dosing pump, the medicine box is connected with the dosing pump, the dosing pump is connected with the lower water tank of the spray tower, the medicine box is used for storing alkaline solution, and the dosing pump is used for conveying the alkaline solution in the medicine box into the lower water tank of the spray tower and neutralizing the spray liquid in the lower water tank of the spray tower.
Wherein, because the circulating water in the lower water tank of the spray tower presents acidity, the medicine box stores alkaline solution, thereby being capable of neutralizing the PH value of the circulating water in the lower water tank of the spray tower.
Wherein, the medical kit adopts automatic timing agitating unit, can effectively prevent the alkaline solution in the medical kit from depositing the problem that leads to because of long-time storage.
In some embodiments, the medicine box is connected with the medicine adding pump through a fifth pipeline, and a medicine adding electric valve is arranged on the fifth pipeline.
Wherein, the opening of the dosing electric valve is controlled to control the dosing amount.
In some embodiments, a first PH sensor is disposed at the circulating water outlet of the lower water tank of the spray tower, the first PH sensor being configured to detect the PH of the spray liquid exiting the circulating water outlet.
Wherein, through setting up first PH sensor in the circulating water exit of spray column lower water tank, detect the PH value of the spray liquid that comes out from circulating water exit through first PH sensor to can guarantee that the spray liquid that comes out from circulating water exit is in neutrality or weak alkaline all the time, stop third pipeline and heat pump 40 and appear corroding.
Wherein the PH value of the spray liquid from the outlet of the circulating water is controlled to be 7-8.5.
In some embodiments, a second PH sensor is disposed at the circulating water inlet of the lower spray tower tank, the second PH sensor being configured to detect the PH of the spray liquid prior to entering the lower spray tower tank from the circulating water inlet.
Wherein, through setting up the second PH sensor in the circulating water entrance of spray column lower water tank, with the first PH sensor coaction of setting up in the circulating water exit of spray column lower water tank, can master the spray liquid in the spray column lower water tank and neutralize the change of pH value in the processing procedure to guarantee that the pH value is handled up to standard.
In some embodiments, the boiler flue gas waste heat recovery system 1000 further includes a display device, where the display device is simultaneously connected to the first PH sensor and the second PH sensor in a communication manner, and the display device is configured to display the PH values transmitted by the first PH sensor and the second PH sensor.
1. Data acquisition
The rated smoke volume 282000m3/h of a single unit of the new source thermoelectric #5 furnace 220t/h. The boiler flue gas waste heat recovery system 1000 is adopted to recover flue gas waste heat after a desulfurization tower of the boiler of the #5 boiler, and the average load of the boiler in heating season is about 185t/h and the full load is 220t/h.
According to investigation data #5, the temperature of the flue gas before desulfurization is 100 ℃, the temperature of the flue gas after wet desulfurization is about 50 ℃, the circulation flow of heat supply network water is about 7500t/h, the water supply temperature is 55-65 ℃, the water supply pressure is 0.6-0.65 MPa, the water return temperature is 40-45 ℃, the water return pressure is 0.12-0.2 MPa, the low-level calorific value of boiler fire coal is 21820kj/kg, and the temperature of the flue gas after a desulfurizing tower is 50 ℃.
The application reduces the temperature of 0.65MPa and 260 ℃ superheated steam to 0.65MPa and 167.8 ℃ saturated steam which is used as a driving heat source of the waste heat recovery system.
2. Design parameters
Comprehensive investigation data and the current boiler operation state determine the basic parameters of flue gas waste heat recovery of the coal-fired boiler as follows:
2.1 boiler load: 220t/h
2.2 Coal low calorific value: 21820kj/kg
2.3 Heat supply network backwater temperature: 45 DEG C
2.4 Heat supply network water supply temperature: 65 DEG C
2.5 Flue gas temperature after desulfurization: 50 DEG C
2.6 Flue gas outlet temperature after waste heat recovery: 30 DEG C
2.7 Rated smoke volume: 28.2 ten thousand Nm 3/h
2.8, Designing waste heat recovery amount: 10MW
2.9 Intermediate water (spray) supply temperature: 25 DEG C
2.10 Intermediate water (spray liquid) backwater temperature: 35 ℃.
In summary, the boiler flue gas waste heat recovery system 1000 provided by the embodiment of the application comprises a boiler 10, a desulfurizing tower 20, a spray tower 30 and a heat pump 40; the boiler 10 is connected with the desulfurizing tower 20 through a first pipeline, and flue gas in the boiler 10 enters the desulfurizing tower 20 through the first pipeline for desulfurization; the desulfurizing tower 20 is connected with the spray tower 30 through a second pipeline, and the flue gas subjected to wet desulfurization by the desulfurizing tower 20 enters the spray tower 30 through the second pipeline, and the flue gas entering the spray tower 30 is subjected to spray heat exchange through the spray tower 30; the spray tower 30 is connected with the heat pump 40 through a third pipeline, and the spray liquid sprayed out of the spray tower 30 exchanges heat with the flue gas and then enters the heat pump 40 through the third pipeline, and the heat of the spray liquid is absorbed by the heat pump 40 for utilization. In the embodiment of the application, the flue gas after desulfurization by the desulfurization tower 20 enters the spray tower 30 through the second pipeline, and the spray liquid sprayed by the spray tower 30 exchanges heat with the flue gas, so that the flue gas waste heat can be recovered, and the waste of the flue gas waste heat energy caused by directly evacuating the flue gas is avoided; and then the heated spray liquid is conveyed into the heat pump 40 through the third pipeline, and the heat of the spray liquid is absorbed by the heat pump 40 for utilization, so that energy sources can be saved. Therefore, the embodiment of the application can recycle the waste heat of the flue gas after wet desulfurization, avoid waste of waste heat energy of the flue gas caused by direct emptying, save energy, reduce the operation cost for enterprises and improve the profitability.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes in detail a boiler flue gas waste heat recovery system provided by the embodiment of the present application, and specific examples are applied to describe the principle and implementation of the present application, and the description of the above embodiment is only used to help understand the technical scheme and core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. The boiler flue gas waste heat recovery system is characterized by comprising a boiler, a desulfurizing tower, a spray tower and a heat pump;
the boiler is connected with the desulfurizing tower through a first pipeline, and flue gas generated by the boiler enters the desulfurizing tower through the first pipeline;
The desulfurization tower is connected with the spray tower through a second pipeline, and flue gas subjected to wet desulfurization by the desulfurization tower enters the spray tower through the second pipeline, and the spray tower is used for carrying out spray heat exchange on the flue gas entering the spray tower;
The spray tower is connected with the heat pump through a third pipeline, spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters the heat pump through the third pipeline, and the heat pump is used for absorbing heat of the spray liquid for utilization.
2. The boiler flue gas waste heat recovery system according to claim 1, wherein a mist eliminator is provided in the spray tower for defogging flue gas in the spray tower before the flue gas leaves the spray tower.
3. The boiler flue gas waste heat recovery system of claim 2, further comprising a mist eliminator spray device for cleaning the mist eliminator.
4. A boiler flue gas waste heat recovery system according to claim 3, wherein the demister spray washing device comprises a demister washing pump and a demister washing nozzle arranged in the spray tower, a bottom circulating water tank of the spray tower is connected with the demister washing nozzle through a fourth pipeline, and the demister washing pump is arranged on the fourth pipeline.
5. The boiler flue gas waste heat recovery system according to claim 4, wherein the spray liquid sprayed out of the spray tower exchanges heat with the flue gas and then enters a lower water tank of the spray tower, the lower water tank of the spray tower is connected with the heat pump through the third pipeline, and the boiler flue gas waste heat recovery system further comprises a dosing device, wherein the dosing device is used for neutralizing the spray liquid entering the lower water tank of the spray tower.
6. The boiler flue gas waste heat recovery system according to claim 5, wherein the dosing device comprises a medicine box and a dosing pump, the medicine box is connected with the dosing pump, the dosing pump is connected with the lower water tank of the spray tower, the medicine box is used for storing alkaline solution, and the dosing pump is used for conveying the alkaline solution in the medicine box into the lower water tank of the spray tower and neutralizing the spray liquid in the lower water tank of the spray tower.
7. The boiler flue gas waste heat recovery system according to claim 6, wherein the medicine box is connected with the medicine adding pump through a fifth pipeline, and a medicine adding electric valve is arranged on the fifth pipeline.
8. The boiler flue gas waste heat recovery system according to claim 6, wherein a first PH sensor is disposed at a circulating water outlet of the lower water tank of the spray tower, and the first PH sensor is configured to detect a PH value of the spray liquid exiting from the circulating water outlet.
9. The boiler flue gas waste heat recovery system according to claim 8, wherein a second PH sensor is provided at the circulating water inlet of the lower water tank of the spray tower, and the second PH sensor is used for detecting the PH value of the spray liquid before entering the lower water tank of the spray tower from the circulating water inlet.
10. The boiler waste heat recovery system of claim 9, further comprising a display device in communication with both the first PH sensor and the second PH sensor, wherein the display device is configured to display the PH values transmitted from the first PH sensor and the second PH sensor.
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| CN202322916876.8U CN221483657U (en) | 2023-10-30 | 2023-10-30 | Boiler flue gas waste heat recovery system |
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