CN217082986U - Circulating water heat energy recovery system of coal-fired boiler desulfurizing tower - Google Patents
Circulating water heat energy recovery system of coal-fired boiler desulfurizing tower Download PDFInfo
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- CN217082986U CN217082986U CN202220944984.9U CN202220944984U CN217082986U CN 217082986 U CN217082986 U CN 217082986U CN 202220944984 U CN202220944984 U CN 202220944984U CN 217082986 U CN217082986 U CN 217082986U
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Abstract
The utility model provides a coal fired boiler desulfurizing tower circulating water heat recovery system, including heat pump set, water tank, desulfurizing tower circulating water pond and control system, heat pump set heat absorption side with desulfurizing tower circulating water pond intercommunication to absorb the waste heat in the desulfurizing tower circulating water pond, heat pump set heat release side with the water tank intercommunication, it is right water in the water tank heats, control system control between heat pump set and the desulfurizing tower circulating water pond the water tank with break-make between the heat pump set. Make full use of water source heat pump fully absorbs the waste heat of desulfurizing tower circulating water to give the boiler with absorptive heat transfer, solved the big problem of current heating boiler fuel energy consumption, reduced the energy resource consumption of boiler, the pollution abatement has realized energy saving and consumption reduction, a plurality of governing valves and temperature controller's setting simultaneously, make can be in real time to the temperature control regulation in the water tank, and then guarantee heat pump set's high-efficient operation.
Description
Technical Field
The utility model relates to a coal fired boiler heating technical field especially indicates a coal fired boiler desulfurizing tower circulating water heat recovery system.
Background
The boiler is an important energy conversion device and is also an energy consumer and an important atmospheric pollution source. The boiler in China is mainly fired coal, wherein the boiler in a coal-fired power plant is rapidly developed towards the direction of high capacity and high parameter in recent years, and the production, manufacture and operation management of the boiler are close to the foreign advanced level; the coal-fired industrial boiler has the advantages of large reserve, wide distribution, high energy consumption, heavy pollution, certain difference between the overall energy efficiency and pollution control level and the energy saving and emission reduction potential compared with the energy efficiency and pollution control level in foreign countries.
At present, the domestic coal-fired boiler flue gas desulfurization process is numerous, and the process can be divided into the following steps according to the desulfurization process: wet, semi-dry, dry. Wherein, the wet process mainly adopts a desulfurization and dust removal tower device, and the common form is a water spraying mode in the tower. The working principle is as follows: the temperature of flue gas generated by the coal-fired boiler before entering the desulfurizing tower is about 120 ℃, the temperature of the flue gas after being sprayed by the desulfurizing tower is lower than 60 ℃, waste water generated by spraying enters a water tank after being discharged from the desulfurizing tower, the temperature of the waste water in the water tank is generally between 50 and 75 ℃, the waste water enters the spraying tower through a circulating water pump, and the steps are repeated. Because the circulation flow and the temperature of the spray water are relatively stable, the spray wastewater in the pool is rich in huge low-quality heat energy.
The heat energy for extracting the circulating water of the desulfurizing tower can be used for heating boiler feed water, and has the characteristics of three aspects: the energy-saving property is outstanding, and the heat energy recovery application can be realized by using the heat pump technology and only using about 1/5 electric energy; secondly, the water saving amount is obvious, a large amount of water vapor is evaporated from the flue gas through water spraying, if a heat pump technology is applied, the temperature of the sprayed water is reduced after heat energy is extracted, the temperature of the flue gas discharged from the tower is reduced by 20 ℃, and the evaporation water yield is reduced by about 30%; and thirdly, the coal consumption is reduced, the heat energy of the boiler comes from the fire coal, and after the heat energy of the smoke tower is utilized, the temperature of the circulating water entering the boiler is directly increased, and the consumption of the fire coal is reduced, so that the beneficial cycle is realized, and the economic benefit is obvious.
At present, the water source heat pump technology is mature day by day, and the water source heat pump technology is popularized and applied in related fields, so that how to couple and cooperate the coal-fired heating boiler and the water source heat pump technology can reduce the consumption and pollutant discharge of coal, and the water source heat pump technology becomes a problem to be solved urgently in the heating industry.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a coal fired boiler desulfurizing tower circulating water heat recovery system to solve among the prior art heat energy in the desulfurizing tower circulating water can not obtain effective utilization, coal fired boiler energy consumption is big and the pollutant discharges more problem simultaneously.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
the utility model provides a coal fired boiler desulfurizing tower circulating water heat recovery system, includes heat pump set, water tank, desulfurizing tower circulating water pond and control system, heat pump set heat absorption side with desulfurizing tower circulating water pond intercommunication to absorb the waste heat in the desulfurizing tower circulating water pond, heat pump set heat release side with the water tank intercommunication, it is right to water in the water tank heats, control system controls between heat pump set and the desulfurizing tower circulating water pond the water tank with break-make between the heat pump set.
Further, heat pump set is absorption formula water source heat pump system, heat pump set includes evaporimeter, condenser, compressor and heat transfer working medium, the evaporimeter side with desulfurizing tower circulating water pond intercommunication, the heat transfer in the circulating water gives the evaporimeter, the condenser with the water tank intercommunication, the condenser with heat transfer gives the water in the water tank.
Furthermore, be connected with outlet pipe way and water intake pipe on the desulfurizing tower circulating water pond, the water intake pipe carry the circulating water to with heat pump set's evaporimeter contact, outlet pipe way will with circulating water after the evaporimeter heat transfer is carried and is returned to in the desulfurizing tower circulating water pond set up on the water intake pipe and get hot side circulating pump for with circulating water pump in the desulfurizing tower circulating water pond reaches in the heat pump set.
Furthermore, the water tank is set as a balance water tank, a heat-preservation partition plate is arranged inside the water tank, the partition plate divides the water tank into a first cavity and a second cavity, the first cavity is used for containing hot water, and the second cavity is used for containing cold water.
Furthermore, the first chamber is connected with a hot water outlet of a condenser of the heat pump unit through a hot water pipeline, hot water after heat exchange of the condenser returns to the inside of the first chamber of the water tank, and outlets at the bottoms of the first chamber and the second chamber are connected with the condenser through a main pipeline after intersection.
Furthermore, a hot water side circulating pump is arranged on the main pipeline and connected with a control system, the control system controls the on-off between a bottom water outlet of the water tank and the condenser, and low-temperature clean water mixed from the first cavity and the second cavity of the water tank is sent to a heat pump unit through the hot water side circulating pump to absorb heat and then enters the first cavity of the water tank.
Furthermore, a second regulating valve is arranged at the bottom outlet of the first chamber, and a first regulating valve is arranged at the bottom outlet of the second chamber and is respectively used for regulating the flow of water discharged from the two chambers.
Furthermore, a hot water outlet pipeline is connected to the first chamber, an external pump is arranged on the hot water outlet pipeline, and the heated clean water in the first chamber is conveyed to a boiler water supply end through the external pump.
Furthermore, a water inlet pipeline is connected to the second cavity, a water replenishing pump is arranged on the water inlet pipeline, and low-temperature clean water is replenished into the second cavity through the water replenishing pump.
Compared with the prior art, coal fired boiler desulfurizing tower circulating water heat recovery system have following advantage:
(1) the waste heat of the circulating water of the desulfurizing tower is fully absorbed by fully utilizing the water source heat pump, and the absorbed heat energy is transferred to the boiler, so that the problem of large fuel energy consumption of the existing heating boiler is solved, the energy consumption of the boiler is reduced, the pollution is reduced, and the energy conservation and consumption reduction are realized.
(2) Meanwhile, due to the arrangement of the regulating valves and the temperature controller, the water temperature in the water tank can be controlled and regulated in real time, and the high-efficiency operation of the heat pump unit is further ensured.
Drawings
FIG. 1 is a schematic view of a system for recovering heat energy from circulating water in a desulfurization tower of a coal-fired boiler.
Description of reference numerals:
1-heat pump unit, 101-evaporator, 102-condenser, 2-water tank, 201-partition plate, 202-first chamber, 203-second chamber, 3-output pump, 4-water replenishing pump, 5-hot water side circulating pump, 6-heat taking side circulating pump, 7-control system, 8-first regulating valve, 9-second regulating valve, 10-first temperature controller, 11-second temperature controller, 12-desulfurizing tower circulating water pool
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
The utility model provides a coal fired boiler desulfurizing tower circulating water heat recovery system, including heat pump set 1, water tank 2, desulfurizing tower circulating water pond 12 and control system 7, heat pump set 1 heat absorption side and desulfurizing tower circulating water pond 12 intercommunication, with the waste heat in the absorption desulfurizing tower circulating water pond, heat pump set 1 heat release side and water tank 2 intercommunication, with heat the water in the water tank 2, control system 7 controls between heat pump set 1 and the desulfurizing tower circulating water pond 12, break-make between water tank 2 and the heat pump set 1. Therefore, the heat of the circulating water in the circulating water pool 12 of the desulfurizing tower is recovered through the heat pump unit, the recovered heat is used for heating low-temperature water of the boiler, the heating boiler is effectively combined with the heat pump technology, the coal consumption and pollutant emission of the boiler are reduced, pollution is reduced, and high-efficiency operation of the heat pump unit is realized.
In this embodiment, the heat pump unit 1 is an absorption water source heat pump system, the heat pump unit 1 includes an evaporator 101, a condenser 102, a compressor and a heat transfer medium, the evaporator 101 side is communicated with the desulfurization tower circulating water tank 12, and heat in the circulating water is transferred to the evaporator 101. The condenser 102 communicates with the water tank 2, and the condenser 102 transfers heat to water in the water tank 2. Preferably, the contact part of the evaporator 101 and the circulating water is made of alkali-resistant materials, so that the evaporator is prevented from being corroded by alkali components in the circulating water.
Further, a water outlet pipeline and a water inlet pipeline are connected to the circulating water tank 12 of the desulfurization tower, the water inlet pipeline is communicated with the evaporator 101 of the heat pump unit 1, the circulating water is conveyed to be in contact with the evaporator 101 by the water inlet pipeline, the water outlet pipeline is also communicated with the evaporator 101, and the circulating water after heat exchange with the evaporator 101 is conveyed back to the circulating water tank 12 of the desulfurization tower by the water outlet pipeline. And a heat taking side circulating pump 6 is arranged on the water inlet pipeline and used for pumping the circulating water in the circulating water pool 12 of the desulfurizing tower into the heat pump unit 1, and the circulating water releases heat in the heat pump unit and then flows back into the circulating water pool 12 of the desulfurizing tower.
Furthermore, the heat-taking side circulating pump 6 is connected with the control system 7, and the control system 7 controls the work of the heat-taking side circulating pump 6, so as to control the on-off between the circulating water and the heat pump unit 1.
In the present embodiment, the water tank 2 is configured as a balance water tank, the heat-insulating partition 201 is disposed inside the water tank 2, the partition 201 divides the water tank 2 into a first chamber 202 and a second chamber 203, the first chamber 202 is used for containing hot water, and the second chamber 203 is used for containing cold water.
Further, the first chamber 202 is connected with a hot water outlet of a condenser 102 of the heat pump unit 1 through a hot water pipeline, hot water after heat exchange with the condenser 102 returns to the inside of the first chamber 202 of the water tank 2, and outlets at the bottoms of the first chamber 202 and the second chamber 203 are connected with the condenser 102 through a main pipeline after meeting, so that low-temperature water discharged from outlets of the first chamber 202 and the second chamber 203 passes through the condenser 102 and exchanges heat with the condenser 102 to absorb heat of the condenser 102. Preferably, a hot water side circulating pump 5 is arranged on the main pipeline, the hot water side circulating pump 5 is connected with a control system 7, and the control system 7 controls the on-off between the bottom water outlet of the water tank 2 and the condenser 102. The low-temperature clean water mixed from the first cavity 202 and the second cavity 203 of the water tank is sent to a heat pump unit through a hot water side circulating pump 5 to absorb heat, and then enters the first cavity 202 of the water tank.
Furthermore, a second regulating valve 9 is arranged at the bottom outlet of the first chamber 202, and a first regulating valve 8 is arranged at the bottom outlet of the second chamber 203, so as to respectively regulate the flow rate of the water discharged from the two chambers. Preferably, the first regulating valve 8 and the second regulating valve 9 may be provided as any one of an electric shutoff valve and an electric butterfly valve.
Further, a hot water outlet pipe is connected to the first chamber 202, an external pump 3 is arranged on the hot water outlet pipe, and the heated clean water in the first chamber 202 is delivered to the boiler water supply end through the external pump 3. Preferably, the output pump 3 is connected to the control system 7, and the control system 7 controls the on/off of the hot water discharged from the first chamber 202 and the boiler.
Still be connected with the inlet channel on the second chamber 203, set up moisturizing pump 4 on the inlet channel, through moisturizing pump 4 to the inside low temperature clear water that supplys of second chamber 203 of water tank 2. Preferably, the water replenishing pump 4 is connected with the control system 7, and the control system 7 controls the on-off of the low-temperature clean water and the second chamber 203 of the water tank 2.
In the present embodiment, a first temperature controller 10 is provided on a side close to the first chamber 202 or a pipe wall of the first chamber 202 for measuring the temperature of water in the first chamber 202; and a second temperature controller 11 is arranged on one side close to the second chamber 203 or the pipe wall of the second chamber 203 and is used for measuring the water temperature in the second chamber 203 so as to accurately control the on-off of each pipeline and pipeline. Preferably, the first temperature controller 10 and the second temperature controller 11 are provided in the form of a thermocouple or a thermal resistor. More preferably, the temperature controller 10 and the second temperature controller 11 are both connected to the control system 7, so as to feed back the detected temperatures of the two chambers to the control system 7, and the control system 7 controls the on/off of each pipeline according to the detected temperatures.
Further, the outward conveying pump 3, the water replenishing pump 4, the hot water side circulating pump 5, and the heat-taking side circulating pump 6 in the present embodiment all employ variable frequency motors, and preferably, the heat-taking side circulating pump 6 is used for conveying the circulating water of the desulfurization tower, and therefore, the heat-taking side circulating pump 6 employs a sewage type water pump.
The utility model discloses an realize the principle as follows:
when the coal-fired boiler operates, high-temperature circulating water in the circulating water pool 12 of the desulfurization tower enters the heat pump unit 1 through the heat taking side circulating pump 6, releases energy and then flows back to the circulating water pool of the desulfurization tower. After absorbing the heat of the high-temperature circulating water, the heat pump unit increases the temperature of the low-temperature clean water from the water tank 2, and the heated clean water enters the first cavity 202 of the water tank 2 and enters the boiler through the external pump 3. Meanwhile, the water replenishing pump 4 injects low-temperature clean water into the second chamber 203 of the water tank 2 in time, and the clean water from the first chamber 202 and the second chamber 203 is mixed through the first regulating valve 8 and the second regulating valve 9 at the bottom of the water tank 2, and then continuously enters the heat pump unit 1 through the hot water circulating pump 5 to absorb heat, so that the water is circulated in a reciprocating manner.
It should be noted that all circulating water pumps in the system are controlled by frequency conversion, and the middle of the water tank is divided into two spaces, namely a hot water chamber and a cold water chamber, by a partition plate. An outlet flow regulating valve and a temperature controller are respectively arranged on the hot water chamber and the cold water chamber of the water tank. During operation, according to the set value of the hot water chamber temperature of the water tank and the temperature of the cold water chamber, the control system adjusts the opening of the adjusting valve, and simultaneously performs frequency conversion control on the hot water taking side water pump and the hot water side circulating pump, so that the high-efficiency operation of the heat pump unit is realized.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. The utility model provides a coal fired boiler desulfurizing tower circulating water heat recovery system, a serial communication port, including heat pump set (1), water tank (2), desulfurizing tower circulating water pond (12) and control system (7), heat pump set (1) heat absorption side with desulfurizing tower circulating water pond (12) intercommunication to absorb the waste heat in the desulfurizing tower circulating water pond, heat pump set (1) heat release side with water tank (2) intercommunication, in order to right water in water tank (2) heats, control system (7) control between heat pump set (1) and desulfurizing tower circulating water pond (12) water tank (2) with break-make between heat pump set (1).
2. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 1, characterized in that heat pump set (1) is absorption water source heat pump system, heat pump set (1) includes evaporimeter (101), condenser (102), compressor and heat transfer working medium, evaporimeter (101) side with desulfurizing tower circulating water pond (12) intercommunication, heat transfer in the circulating water is for evaporimeter (101), condenser (102) with water tank (2) intercommunication, condenser (102) with the water tank (2) in the heat transfer of heat transfer.
3. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 1, characterized in that a water outlet pipeline and a water inlet pipeline are connected to the desulfurizing tower circulating water pool (12), the water inlet pipeline conveys circulating water to be in contact with the evaporator (101) of the heat pump unit (1), the water outlet pipeline conveys the circulating water after heat exchange with the evaporator (101) back to the desulfurizing tower circulating water pool (12), and a heat taking side circulating pump (6) is arranged on the water inlet pipeline and used for pumping the circulating water in the desulfurizing tower circulating water pool (12) to the heat pump unit (1).
4. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system according to claim 1, characterized in that the water tank (2) is set as a balance water tank, a heat preservation partition plate (201) is arranged inside the water tank (2), the partition plate (201) divides the water tank (2) into a first chamber (202) and a second chamber (203), the first chamber (202) is used for containing hot water, and the second chamber (203) is used for containing cold water.
5. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 4, characterized in that, the first chamber (202) is connected with the hot water outlet of the condenser (102) of the heat pump unit (1) through a hot water pipeline, the hot water after heat exchange by the condenser (102) returns to the inside of the first chamber (202) of the water tank (2), and the bottom outlets of the first chamber (202) and the second chamber (203) are connected with the condenser (102) through a main pipeline after meeting.
6. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 5, characterized in that a hot water side circulating pump (5) is arranged on the main pipeline, the hot water side circulating pump (5) is connected with a control system (7), the control system (7) controls the on-off between the bottom water outlet of the water tank (2) and the condenser (102), and the hot water side circulating pump (5) sends low-temperature clear water mixed from the first chamber (202) and the second chamber (203) of the water tank (2) into a heat pump unit for heat absorption, and then the low-temperature clear water enters the first chamber (202) of the water tank.
7. The system for recycling thermal energy of circulating water of a desulfurization tower of a coal-fired boiler as recited in claim 4, characterized in that a second regulating valve (9) is arranged at the bottom outlet of the first chamber (202), and a first regulating valve (8) is arranged at the bottom outlet of the second chamber (203) for respectively regulating the flow rate of the water discharged from the two chambers.
8. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 4, characterized in that, still be connected with the hot water outlet pipe on the first chamber (202), be provided with defeated pump (3) on the hot water outlet pipe, carry the clear water after the heating in the first chamber (202) to boiler feed water end through defeated pump (3) outward.
9. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system of claim 4, characterized in that, a water inlet pipeline is further connected to the second chamber (203), a water make-up pump (4) is arranged on the water inlet pipeline, and the low-temperature clean water is supplemented to the interior of the second chamber (203) through the water make-up pump (4).
10. The coal-fired boiler desulfurizing tower circulating water heat energy recovery system according to claim 4, characterized in that a first temperature controller (10) is provided on the side close to the first chamber (202) or the pipe wall of the first chamber (202) for measuring the temperature of water in the first chamber (202), and a second temperature controller (11) is provided on the side close to the second chamber (203) or the pipe wall of the second chamber (203) for measuring the temperature of water in the second chamber (203).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220944984.9U CN217082986U (en) | 2022-04-22 | 2022-04-22 | Circulating water heat energy recovery system of coal-fired boiler desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220944984.9U CN217082986U (en) | 2022-04-22 | 2022-04-22 | Circulating water heat energy recovery system of coal-fired boiler desulfurizing tower |
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| Publication Number | Publication Date |
|---|---|
| CN217082986U true CN217082986U (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220944984.9U Active CN217082986U (en) | 2022-04-22 | 2022-04-22 | Circulating water heat energy recovery system of coal-fired boiler desulfurizing tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217082986U (en) |
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2022
- 2022-04-22 CN CN202220944984.9U patent/CN217082986U/en active Active
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