CN211692405U - Shaft anti-freezing system for gradient utilization of return air waste heat - Google Patents
Shaft anti-freezing system for gradient utilization of return air waste heat Download PDFInfo
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- CN211692405U CN211692405U CN202020251494.1U CN202020251494U CN211692405U CN 211692405 U CN211692405 U CN 211692405U CN 202020251494 U CN202020251494 U CN 202020251494U CN 211692405 U CN211692405 U CN 211692405U
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Abstract
The utility model belongs to the technical field of the colliery heating, concretely relates to return air waste heat gradient utilization's pit shaft anti-freezing system, it has solved the problem that prior art exists. The utility model comprises a return air shaft, a primary heat exchange system, a secondary heating system, a return air channel, an air inlet shaft and a well mouth heating room arranged on the mouth of the air inlet shaft; the primary heat exchange system comprises a spray row, a spray water collecting tank and a heat exchange heater; the spraying row is positioned on the air outlet side of the air return channel; the dividing wall heat exchanger, the water source heat pump unit and the energy storage water tank of the secondary heating system are sequentially communicated through pipelines; the dividing wall heat exchanger is positioned at the air outlet side of the air return channel; a heat pump condenser of the water source heat pump unit and a heat exchange heater of the primary heat exchange system are both positioned in the wellhead heating room and are close to a fresh air inlet of the wellhead heating room; the utility model selects different equipment according to the change of the heat load, thereby saving energy systematically and lowering the operating cost; the coal mine coal-saving emission reduction device can also realize coal reduction and emission reduction of a coal mine, reduce environmental pollution, save energy and protect environment.
Description
Technical Field
The utility model belongs to the technical field of the colliery heating, concretely relates to return air waste heat gradient utilization's pit shaft anti-freezing system.
Background
The existing mine return air waste heat utilization technology mainly has three different technical routes:
firstly, the spray type heat taking has the defects that the heat taking quantity is small, a large amount of coal dust is easy to accumulate on a nozzle and block, and meanwhile, after the return air temperature is lower than 10 ℃, an antifreeze agent needs to be continuously added to ensure that the heat can be continuously taken, the operation cost is high, the antifreeze agent is corroded, and the like.
The direct evaporation type heat extraction has the problems that a return air heat exchanger is easy to block and the air resistance of the return air heat exchanger is large due to the fact that more dust is mixed in return air, meanwhile, the direct evaporation type heat extraction also has the defects that the heat exchange area of a single evaporator is small, the heating efficiency of the return air source heat pump is affected by frosting and defrosting of the evaporator when the temperature of the return air is low, and the application and popularization of the direct evaporation type return air source heat pump are limited.
And thirdly, glycol solution partition-wall type heat exchange, namely, the glycol solution is adopted as cold-carrying, and the partition-wall type heat exchange is utilized as a heat source of the low-temperature water source heat pump. The heat exchange mode avoids the defects of the two technical routes, but if the heat load required by shaft anti-freezing is large, and the deep heat extraction of return air is required, the problems of difficult defrosting and higher cleaning and operating cost of the dividing wall type heat exchanger exist.
The three return air waste heat utilization technologies all have the problem of low energy saving rate, basically save coal and save no energy when applied in some occasions, only solve the problem of replacing a coal-fired boiler, and have no obvious energy-saving benefit. Therefore, the problems of low market competitiveness, high popularization difficulty and the like exist, and the full and effective utilization of the return air waste heat resource cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the existing return air waste heat utilization technology can not be put into operation in a segmented mode according to the anti-freezing heat load requirement of a shaft; different return air utilization technical routes have different advantages and disadvantages and cannot be organically combined; the problem that the return air waste heat resource cannot be effectively and fully utilized is solved, and the shaft antifreezing system which is low in comprehensive energy consumption, high in heat exchange efficiency, free from the limitation of use regions, capable of saving a large amount of energy and reducing environmental pollution and capable of utilizing the return air waste heat in a gradient manner is provided.
The utility model discloses a following technical scheme realizes: a shaft anti-freezing system for gradient utilization of return air waste heat comprises a return air shaft, a primary heat exchange system, a secondary heating system, a return air channel, an air inlet shaft and a shaft mouth heating room arranged at the shaft mouth of the air inlet shaft;
the air return channel comprises an air inlet side and an air outlet side, the air inlet side of the air return channel is positioned at the top of the air return shaft, the air outlet side of the air return channel is positioned at the rear ends of the primary heat exchange system and the secondary heating system, and the tail end of the air outlet side of the air return channel is provided with an air outlet; a main fan is arranged between the air inlet side and the air outlet side of the air return channel;
fresh air inlets are formed in the periphery of the wellhead heating room;
the primary heat exchange system comprises a spray row, a spray water collecting tank and a heat exchange heater; the spray row is positioned on the air outlet side of the air return channel, and the heat exchange heater is positioned in the wellhead heating room and close to a fresh air inlet of the wellhead heating room; the top of the spray row is communicated with the heat exchange heater through a pipeline; the spraying water collecting tank is positioned at the bottom of the spraying row and is communicated with the heat exchange heater through a pipeline, and a heat exchange circulating pump and a sedimentation tank are arranged on the pipeline through which the spraying water collecting tank is communicated with the heat exchange heater; the bottom of the sedimentation tank is communicated with a sewage tank through a sewage discharge pipe, and a sewage discharge pump is arranged on the sewage discharge pipe;
the secondary heating system comprises a dividing wall heat exchanger, a water source heat pump unit and an energy storage water tank, the dividing wall heat exchanger, the water source heat pump unit and the energy storage water tank are sequentially communicated through pipelines, and a source side circulating pump is arranged on a pipeline through which the energy storage water tank is communicated with the water source heat pump unit; the water source heat pump unit comprises a heat pump condenser, an expansion valve, a shell and tube evaporator and a compressor; the dividing wall heat exchanger is positioned on the air outlet side of the air return channel and between the air outlet of the air return channel and the spray row of the primary heat exchange system; the heat pump condenser is positioned in the wellhead heating room and close to a fresh air inlet of the wellhead heating room; the dividing wall heat exchanger is communicated with one end of a shell-and-tube evaporator of the water source heat pump unit, and the energy storage water tank is communicated with the other end of the shell-and-tube evaporator of the water source heat pump unit;
a bypass air port is arranged at the top of the air outlet side of the air return channel, and a bypass air door is arranged at one side of the bypass air port; the bypass air port is positioned above the spray row of the first-stage heat exchange system and the partition wall heat exchanger of the second-stage heating system.
Furthermore, the sedimentation tank comprises a sedimentation tank clear water side and a sedimentation tank sewage side, a partition plate is arranged between the sedimentation tank clear water side and the sedimentation tank sewage side, and the top of the partition plate is lower than the top of the sedimentation tank; the bottom of the sewage side of the sedimentation tank is communicated with the sewage tank through a sewage discharge pipe.
Furthermore, a water baffle is arranged between the spraying row of the primary heat exchange system and the dividing wall heat exchanger of the secondary heating system.
Further, the water source heat pump unit is a flooded water source heat pump unit, a dry water source heat pump unit or a falling film water source heat pump unit.
Furthermore, the air return channel is provided with two sets of air return channels, one set of air return channels is used and the other set of air return channels is standby, and an air return diffusion tower is further arranged in the air return channels.
The utility model discloses compare prior art's beneficial effect:
the utility model can be put into operation according to the shaft anti-freezing heat load demand in grades, when the heat load is smaller, the primary heat exchange system is started to directly heat the fresh air, but when the heat load is larger, the secondary heating is started to deeply heat the fresh air from the return air to heat the fresh air again; the utility model selects different equipment according to the change of the heat load, thereby saving energy systematically and lowering the operating cost;
the primary heat exchange system directly heats fresh air by using the waste heat of return air through the heat exchange heater, basically does not consume electricity, and is favorable for saving a large amount of electric energy;
the secondary heat exchange system starts a water source heat pump unit, low-temperature secondary refrigerant (low-temperature solution) flows into the dividing wall heat exchanger to exchange heat with return air, and then the heat is a low-temperature heat source, and fresh air is directly heated; the heat pump system takes the waste heat of return air as a heat source, and saves energy by more than 60 percent compared with the direct electric heating;
the utility model can fully and effectively utilize the return air waste heat resource, can realize coal reduction and emission reduction of the coal mine, reduce environmental pollution, save energy and protect environment; the device can reliably and stably take heat from the return air of the coal mine in an energy-saving way, has remarkable energy saving effect and ensures the anti-freezing function of the shaft.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-a wellhead heating room, 2-an air inlet well, 3-a heat pump condenser, 4-a heat exchange heater, 5-a compressor, 6-a shell-and-tube evaporator, 7-an expansion valve, 8-a source side circulating pump, 9-an energy storage water tank, 10-a spray collecting tank, 11-a main fan, 12-a dividing wall heat exchanger, 13-a water source heat pump unit, 14-a bypass air port, 15-a bypass air door, 16-a water baffle, 17-an air return well, 18-a spray row, 19-a sedimentation tank, 20-a heat exchange circulating pump, 21-a sedimentation tank clear water side, 22-a sedimentation tank sewage side, 23-a sewage discharge pump, 24-a sewage discharge pipe, 25-an air return channel, 26-an air outlet and 27-a fresh air inlet.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
referring to fig. 1, the utility model provides a shaft antifreeze system for gradient utilization of return air waste heat, which comprises a return air shaft 17, a primary heat exchange system, a secondary heating system, a return air channel 25, an air inlet shaft 2 and a wellhead heating room 1 arranged at the wellhead of the air inlet shaft 2;
the air return channel 25 comprises an air inlet side and an air outlet side, the air inlet side of the air return channel 25 is positioned at the top of the air return shaft 17, the air outlet side of the air return channel 25 is positioned at the rear ends of the primary heat exchange system and the secondary heating system, and the tail end of the air outlet side of the air return channel 25 is provided with an air outlet 26; a main fan 11 is arranged between the air inlet side and the air outlet side of the air return channel 25;
the periphery of the wellhead heating room 1 is provided with a fresh air inlet 27;
the primary heat exchange system comprises a spray row 18, a spray water collecting tank 10 and a heat exchange heater 4; the spray row 18 is positioned at the air outlet side of the air return channel 25, and the heat exchange heater 4 is positioned in the wellhead heating room 1 and close to a fresh air inlet 27 of the wellhead heating room 1; the top of the spray row 18 is communicated with the heat exchange heater 4 through a pipeline; the spraying water collecting tank 10 is positioned at the bottom of the spraying row 18, the spraying water collecting tank 10 is communicated with the heat exchange heater 4 through a pipeline, and a heat exchange circulating pump 20 and a sedimentation tank 19 are arranged on the pipeline for communicating the spraying water collecting tank 10 with the heat exchange heater 4; the bottom of the sedimentation tank 19 is communicated with a sewage tank through a sewage discharge pipe 24, and a sewage discharge pump 23 is arranged on the sewage discharge pipe 24;
the secondary heating system comprises a dividing wall heat exchanger 12, a water source heat pump unit 13 and an energy storage water tank 9, the dividing wall heat exchanger 12, the water source heat pump unit 13 and the energy storage water tank 9 are sequentially communicated through pipelines, and a source side circulating pump 8 is arranged on a pipeline through which the energy storage water tank 9 is communicated with the water source heat pump unit 13; the water source heat pump unit 13 comprises a heat pump condenser 3, an expansion valve 7, a shell-and-tube evaporator 6 and a compressor 5; the dividing wall heat exchanger 12 is positioned at the air outlet side of the air return channel 25, and the dividing wall heat exchanger 12 is positioned between the air outlet 26 of the air return channel 25 and the spray row 18 of the primary heat exchange system; the heat pump condenser 3 is positioned in the wellhead heating room 1 and close to a fresh air inlet 27 of the wellhead heating room 1; the dividing wall heat exchanger 12 is communicated with one end of a shell-and-tube evaporator 6 of the water source heat pump unit 13, and the energy storage water tank 9 is communicated with the other end of the shell-and-tube evaporator 6 of the water source heat pump unit 13;
a bypass air port 14 is arranged at the top of the air outlet side of the air return channel 25, and a bypass air door 15 is arranged at one side of the bypass air port 14; the bypass air port 14 is positioned above the space wall heat exchanger 12 of the secondary heating system and the spray row 18 of the primary heat exchange system; when a shaft is not needed to be prevented from freezing in summer, the secondary heating system is closed, the primary heat exchange system is started, return air in the return air shaft 17 falls into dust under the action of the spraying row 18 of the primary heat exchange system through the return air channel 25, and the return air after falling into dust is discharged outdoors through the bypass air door 15, so that the environment is protected.
The sedimentation tank 19 comprises a sedimentation tank clear water side 21 and a sedimentation tank sewage side 22, a partition plate is arranged between the sedimentation tank clear water side 21 and the sedimentation tank sewage side 22, and the top of the partition plate is lower than that of the sedimentation tank 19; the bottom of the sewage side 22 of the sedimentation tank is communicated with the sewage tank through a sewage discharge pipe 24; the cold water after absorbing heat directly enters the sewage side 22 of the sedimentation tank from the pipeline, overflows to the clear water side 21 of the sedimentation tank after being precipitated in the sewage side 22 of the sedimentation tank, and clear water overflowing to the clear water side 21 of the sedimentation tank circulates in a secondary heating system under the action of a heat exchange circulating pump 20; the sludge settled at the bottom of the sewage side 22 of the sedimentation tank is discharged into the sewage tank through a sewage discharge pipe 24 under the action of a sewage discharge pump 23.
A water baffle 16 is arranged between the spray row 18 of the primary heat exchange system and the dividing wall heat exchanger 12 of the secondary heating system, and the water baffle 16 is arranged to prevent spray water from entering the dividing wall heat exchanger 12.
The water source heat pump unit 13 is a flooded water source heat pump unit, a dry water source heat pump unit or a falling film water source heat pump unit.
The air return channels 25 are provided with two sets, one is used and the other is standby (for the safety of mines, the two air return channels 25 are consistent in structure and arrangement, the other one is put into use and the other one is standby), and the air return channels 25 are also provided with air return diffusion towers, so that the air in the air return shaft 17 can be diffused to the air outlet side of the air return channels 25 as soon as possible.
The utility model discloses a theory of operation:
the utility model discloses fully realized the gradient utilization of return air waste heat: the utility model is used for heating the fresh air of the air inlet shaft 2 under different heat load conditions, and when the heat load is small, the primary heat exchange system is started; when the heat load is large, a primary heat exchange system and a secondary heating system are started at the same time;
a primary heat exchange system: relatively low-temperature cold water is sprayed out from the spray rows 18 and then performs sufficient heat and mass exchange with mine return air from the return air channel 25, the temperature of the cold water rises after the heat of the return air is absorbed, and the cold water falls into the spray collecting tank 10 under the action of gravity and then enters the sedimentation tank 29; the heated water enters the heat exchange heater 4 from the sedimentation tank 29 under the action of the heat exchange circulating pump 20, the heat exchange heater 4 is used for directly heating fresh air, and the shaft antifreezing requirement can be met only by consuming a small amount of electric energy; the cold water of the heat exchange heater 4 enters the spray row 18 through a pipeline again, and the circulation is carried out in this way; the return air which passes through the spraying exhaust 18 of the primary heat exchange system and is subjected to dust fall is exhausted to the outside through a bypass air door 15 of a bypass air port 14;
a secondary heating system: the return air dedusted by the spray rows 18 of the primary heat exchange system enters the dividing wall heat exchanger 12, the low-temperature secondary refrigerant (low-temperature solution) in the dividing wall heat exchanger 12 and the return air further exchange heat under the action of the source side circulating pump 8, the temperature of the low-temperature secondary refrigerant (low-temperature solution) is raised, and the low-temperature secondary refrigerant enters the shell-and-tube evaporator 6 of the water source heat pump unit 13 to serve as a low-temperature heat source; the refrigeration working medium of the water source heat pump unit 13 is vaporized into low-temperature and low-pressure steam in the shell-and-tube evaporator 6 under the action of a low-temperature heat source, then the low-temperature and low-pressure steam is converted into high-temperature and high-pressure steam through the compressor 5 and then is discharged into the heat pump condenser 3, the refrigeration working medium of the water source heat pump unit 13 releases heat outwards in the heat pump condenser 3 (so as to heat fresh air passing through the side of the heat pump condenser 3) to form low-temperature and high-pressure liquid, the low-temperature and high-pressure liquid is throttled and; the return air after heat exchange by the dividing wall heat exchanger 12 is discharged to the outside through the air outlet 26.
The utility model discloses an useful part:
the utility model can be put into operation according to the shaft anti-freezing heat load demand in grades, when the heat load is smaller, the primary heat exchange system is started to directly heat the fresh air, but when the heat load is larger, the secondary heating is started to deeply heat the fresh air from the return air to heat the fresh air again; the utility model selects different equipment according to the change of the heat load, thereby saving energy systematically and lowering the operating cost;
the primary heat exchange system directly heats fresh air by using the waste heat of return air through the heat exchange heater, basically does not consume electricity, and is favorable for saving a large amount of electric energy;
the secondary heat exchange system starts a water source heat pump unit, low-temperature secondary refrigerant (low-temperature solution) flows into the dividing wall heat exchanger to exchange heat with return air, and then the heat is a low-temperature heat source, and fresh air is directly heated; the heat pump system takes the waste heat of return air as a heat source, and saves energy by more than 60 percent compared with the direct electric heating;
the utility model can fully and effectively utilize the return air waste heat resource, can realize coal reduction and emission reduction of the coal mine, reduce environmental pollution, save energy and protect environment; the device can reliably and stably take heat from the return air of the coal mine in an energy-saving way, has remarkable energy saving effect and ensures the anti-freezing function of the shaft.
Claims (5)
1. The utility model provides a return air waste heat gradient utilization's pit shaft system of preventing frostbite which characterized in that: comprises a return air shaft (17), a primary heat exchange system, a secondary heating system, a return air channel (25), an air inlet shaft (2) and a wellhead heating room (1) arranged at the wellhead of the air inlet shaft (2);
the air return channel (25) comprises an air inlet side and an air outlet side, the air inlet side of the air return channel (25) is positioned at the top of the air return shaft (17), the air outlet side of the air return channel (25) is positioned at the rear ends of the primary heat exchange system and the secondary heating system, and the tail end of the air outlet side of the air return channel (25) is provided with an air outlet (26); a main fan (11) is arranged between the air inlet side and the air outlet side of the air return channel (25);
fresh air inlets (27) are formed in the periphery of the wellhead heating room (1);
the primary heat exchange system comprises a spray row (18), a spray water collecting tank (10) and a heat exchange heater (4); the spray row (18) is positioned at the air outlet side of the air return channel (25), and the heat exchange heater (4) is positioned in the wellhead heating room (1) and close to a fresh air inlet (27) of the wellhead heating room (1); the top of the spray row (18) is communicated with the heat exchange heater (4) through a pipeline; the spraying water collecting tank (10) is positioned at the bottom of the spraying row (18), the spraying water collecting tank (10) is communicated with the heat exchange heater (4) through a pipeline, and a heat exchange circulating pump (20) and a sedimentation tank (19) are arranged on the pipeline for communicating the spraying water collecting tank (10) with the heat exchange heater (4); the bottom of the sedimentation tank (19) is communicated with a sewage tank through a sewage discharge pipe (24), and a sewage discharge pump (23) is arranged on the sewage discharge pipe (24);
the secondary heating system comprises a dividing wall heat exchanger (12), a water source heat pump unit (13) and an energy storage water tank (9), the dividing wall heat exchanger (12), the water source heat pump unit (13) and the energy storage water tank (9) are sequentially communicated through a pipeline, and a source side circulating pump (8) is arranged on the pipeline through which the energy storage water tank (9) is communicated with the water source heat pump unit (13); the water source heat pump unit (13) comprises a heat pump condenser (3), an expansion valve (7), a shell-and-tube evaporator (6) and a compressor (5); the dividing wall heat exchanger (12) is positioned on the air outlet side of the air return channel (25), and the dividing wall heat exchanger (12) is positioned between an air outlet (26) of the air return channel (25) and a spray row (18) of the primary heat exchange system; the heat pump condenser (3) is positioned in the wellhead heating room (1) and is close to a fresh air inlet (27) of the wellhead heating room (1); the dividing wall heat exchanger (12) is communicated with one end of a shell-and-tube evaporator (6) of the water source heat pump unit (13), and the energy storage water tank (9) is communicated with the other end of the shell-and-tube evaporator (6) of the water source heat pump unit (13);
a bypass air opening (14) is arranged at the top of the air outlet side of the air return channel (25), and a bypass air door (15) is arranged at one side of the bypass air opening (14); the bypass air opening (14) is positioned above the space wall heat exchanger (12) of the secondary heating system and the spray row (18) of the primary heat exchange system.
2. The return air residual heat gradient utilization wellbore anti-freezing system as claimed in claim 1, wherein: the sedimentation tank (19) comprises a sedimentation tank clear water side (21) and a sedimentation tank sewage side (22), a partition plate is arranged between the sedimentation tank clear water side (21) and the sedimentation tank sewage side (22), and the top of the partition plate is lower than that of the sedimentation tank (19); the bottom of the sewage side (22) of the sedimentation tank is communicated with the sewage tank through a sewage discharge pipe (24).
3. The return air residual heat gradient utilization shaft anti-freezing system as claimed in claim 1 or 2, characterized in that: a water baffle (16) is arranged between the spray row (18) of the primary heat exchange system and the dividing wall heat exchanger (12) of the secondary heating system.
4. The return air residual heat gradient utilization wellbore anti-freezing system as claimed in claim 3, wherein: the water source heat pump unit (13) is a flooded water source heat pump unit, a dry water source heat pump unit or a falling film water source heat pump unit.
5. The return air residual heat gradient utilization wellbore anti-freezing system as claimed in claim 4, wherein: the air return channel (25) is provided with two sets, one set is used and the other set is standby, and an air return diffusion tower is further arranged in the air return channel (25).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020251494.1U CN211692405U (en) | 2020-03-04 | 2020-03-04 | Shaft anti-freezing system for gradient utilization of return air waste heat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020251494.1U CN211692405U (en) | 2020-03-04 | 2020-03-04 | Shaft anti-freezing system for gradient utilization of return air waste heat |
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| CN211692405U true CN211692405U (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294195A (en) * | 2021-06-28 | 2021-08-24 | 中亘节能科技有限公司 | Ventilation air methane heat taking system and method for coal mine well mouth freeze prevention |
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2020
- 2020-03-04 CN CN202020251494.1U patent/CN211692405U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294195A (en) * | 2021-06-28 | 2021-08-24 | 中亘节能科技有限公司 | Ventilation air methane heat taking system and method for coal mine well mouth freeze prevention |
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