CN211692533U - Shaft anti-freezing system based on direct heat exchange type heat energy recovery - Google Patents
Shaft anti-freezing system based on direct heat exchange type heat energy recovery Download PDFInfo
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- CN211692533U CN211692533U CN202020251084.7U CN202020251084U CN211692533U CN 211692533 U CN211692533 U CN 211692533U CN 202020251084 U CN202020251084 U CN 202020251084U CN 211692533 U CN211692533 U CN 211692533U
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Abstract
The utility model belongs to colliery heating and ventilation field, concretely relates to pit shaft anti-freezing system based on direct heat transfer formula heat recovery, it is high, the working costs is high when having solved the heat pump technical route of adoption among the current mine return air waste heat utilization technique, adopts the big problem of the application degree of difficulty of heat pipe technique. The utility model comprises a return air shaft, a return air channel, an air heat exchange chamber, a first fresh air chamber, a second fresh air chamber positioned at the bottom of the air heat exchange chamber, a well mouth heating chamber and an air inlet shaft; the air-air heat exchange chamber is communicated with the air return shaft through an air return channel; the top of a circulation pipe in an air heat exchange pipe of the air heat exchange chamber is communicated with the first fresh air chamber, and the bottom of the circulation pipe is communicated with the second fresh air chamber; the air supply outlet is communicated with the wellhead heating room through an air supply channel, and the wellhead heating room is arranged at the top of the air inlet shaft. The utility model can realize energy conservation and emission reduction of coal mines, has low operating cost and more remarkable energy-saving effect; unpowered operation is realized, and the reliability is higher; there is no risk of freezing.
Description
Technical Field
The utility model belongs to colliery heating and ventilation field, concretely relates to pit shaft anti-freezing system based on direct heat transfer formula heat recovery.
Background
When low-grade heat energy such as mine return air, drainage, process cooling water and the like is applied, a heat pump unit is required to recover heat to prepare high-temperature hot water for shaft anti-freezing, a heat pump machine room is required to be built, the problem of high initial investment cost of a project exists, and meanwhile, because the coal mine condition changes greatly and waste heat resources are unstable, when part of coal mines are applied to heat pump technology to solve shaft anti-freezing, the problems that coal is saved, energy is not saved, only the problem of adopting clean energy to replace is solved, the energy-saving economic benefit is not obvious, the popularization difficulty is high and the like are solved; when far infrared electric heating, an electric heating furnace or an electromagnetic hot blast stove is applied to solve the problem of wellhead anti-freezing, the electric heating furnace or the electromagnetic hot blast stove has high power consumption, often needs to be simultaneously increased in capacity by matching with electric power, has higher running cost and poor economical efficiency, and causes running cost pressure for coal mines.
The existing mine return air waste heat utilization technology mainly has three different technical routes:
firstly, spray type heat extraction has the defects that the heat extraction amount is small, a large amount of coal dust is easy to accumulate on a nozzle and block, and an antifreeze agent is required to be continuously added after the return air temperature is lower than 10 ℃.
The direct evaporation type heat extraction has the problems that the return air heat exchanger is easy to block due to the fact that more dust is mixed in return air, the air resistance of the return air heat exchanger is large, meanwhile, the direct evaporation type heat extraction also has the defect 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 return air temperature is low, and application and popularization of the direct evaporation type return air source heat pump are restricted.
And thirdly, glycol solution dividing wall type heat exchange, namely, dividing wall type heat exchange is adopted and is used as a heat source of the low-temperature water source heat pump. The defects of the two technical routes are overcome by the heat exchange mode, but if the heat load required by shaft anti-freezing is large, the problems of difficult defrosting and high cleaning and operating cost exist when the heat needs to be raised to the depth of return air, and the heat supply requirement can be met by further improvement.
The three return air waste heat utilization technologies all have the problem of low energy saving rate, part of enterprises use low-temperature heat pipes as main heat exchange units, return air can be directly utilized to heat fresh air by utilizing the heat pipe technology, and the wellhead anti-freezing system is free of combustion, smoke discharge and waste generation in the operation process. However, mine return air has the characteristics of low air temperature and high humidity, the temperature of the mine return air is generally less than 18 ℃, and the relative humidity is more than 85% (the mine return air is usually discharged in an atomized state in winter); the mine return air is accompanied with technical difficulties of large dust content, corrosivity and the like, the application difficulty of the heat pipe heat exchange technology is increased undoubtedly, and the full and effective utilization of return air waste heat resources cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the initial investment is high, the working costs is high when solving and adopting the heat pump technology route among the current mine return air waste heat utilization technique, adopts the big problem of the application degree of difficulty of heat pipe technique, provides a pit shaft anti-freezing system based on direct heat transfer formula heat recovery.
The utility model discloses a following technical scheme realizes: a shaft anti-freezing system based on direct heat exchange type heat energy recovery comprises a return air shaft, a return air channel, an air-air heat exchange chamber, a first fresh air chamber positioned at the top of the air-air heat exchange chamber, a second fresh air chamber positioned at the bottom of the air-air heat exchange chamber, a wellhead heating chamber and an air inlet shaft;
the top of one end of the air-air heat exchange chamber is provided with a return air outlet for discharging return air after heat exchange, the bottom of the other end of the air-air heat exchange chamber is provided with a return air inlet, the return air inlet is communicated with a return air well through a return air channel, and a return air main fan is arranged in the return air channel;
one end of the first fresh air chamber is provided with a fresh air inlet, and a blower for conveying fresh air is arranged in the first fresh air chamber at a position close to the fresh air inlet; the air heat exchange chamber is internally and vertically provided with an air heat exchange device, the air heat exchange device comprises a plurality of air heat exchange tubes, circulation tubes are arranged in the air heat exchange tubes, the tops of the circulation tubes are communicated with the first fresh air chamber, and the bottoms of the circulation tubes are communicated with the second fresh air chamber; one end of the second fresh air chamber is provided with an air supply outlet which is communicated with a wellhead heating room through an air supply channel, and the wellhead heating room is arranged at the top of the air inlet shaft;
the bottom of the wind-wind heat exchange chamber is provided with a water collecting tank for collecting condensed water.
The system further comprises a condensed water discharge unit, wherein the condensed water discharge unit comprises a pre-sedimentation sewage tank, and the top of the pre-sedimentation sewage tank is communicated with the water collecting tank through a pipeline; the pre-precipitation sewage tank also discharges pre-precipitated sewage through a drainage pipeline, and a sewage discharge pump is arranged on the drainage pipeline; the bottom of the pre-precipitation sewage tank is provided with a sludge port for cleaning the pre-precipitated sludge.
Furthermore, a bypass air door is arranged on the return air channel, and the end part of the bypass air door is arranged at a bypass air outlet for discharging return air.
Furthermore, a guide plate is arranged in the first fresh air chamber and is positioned beside the air feeder.
Furthermore, the number of the air blowers is one or more.
Furthermore, the number of the wind heat exchange devices in the wind heat exchange chamber is one or more, and the multiple groups of wind heat exchange devices are arranged in the wind heat exchange chamber in parallel.
Furthermore, the material of a circulating pipe of the wind heat exchange pipe in the wind heat exchange chamber is stainless steel or a copper pipe; the distance between the circulating pipes is more than or equal to 5 mm.
The utility model discloses compare prior art's beneficial effect:
1. the utility model adopts the wind-wind heat exchange technology, no pollution, no combustion, no smoke discharge and no waste are generated in the actual operation process, the difficult problems of large dust content and corrosivity of mine return air are solved, only a small amount of electric energy is needed for the air feeder to supply fresh air, the installed power is small, the energy conservation and emission reduction of a coal mine can be realized, the operation cost is low, and the energy-saving effect is more remarkable;
2. the utility model fully utilizes the heat of the mine return air, utilizes the mine return air to directly heat the fresh air for preventing the shaft from freezing by a heat exchange technical means, has less intermediate links, realizes unpowered operation, has higher reliability, can be operated unattended and fully automatically;
3. the utility model effectively utilizes the low-grade heat source of the mine return air, the system is simple and reliable to operate, in addition, the utility model can selectively put the number or the rotating speed of the operating air feeder according to the change of the outdoor environment temperature and the anti-freezing heat load of the shaft, thereby further reducing the operating cost and having good practicability; meanwhile, because a wellhead heater is not needed, the risk of freezing does not exist, and the risk of frost cracking of the heat exchange tube in the wellhead heater caused by low water supply temperature in the replacement process of other clean energy sources can be avoided.
Drawings
FIG. 1 is a schematic diagram of the present invention;
in the figure: 1-a wellhead heating room, 2-an air inlet well, 3-an air outlet, 4-an air supply channel, 5-a return air outlet, 6-a first fresh air chamber, 7-a blower, 8-a fresh air inlet, 9-a return air inlet, 10-a return air channel, 11-a return air main fan, 12-a return air well, 13-a bypass air door, 14-a bypass air outlet, 15-a second fresh air chamber, 16-a sewage discharge pump, 17-a water discharge pipeline, 18-a sludge outlet, 19-a pre-precipitation sewage tank, 20-an air heat exchange pipe, 20.1-a circulating pipe, 20.2-a water collecting tank and 21-an air heat exchange chamber.
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 anti-freezing system based on direct heat exchange type heat energy recovery, which comprises a return air shaft 12, a return air channel 10, an air-air heat exchange chamber 21, a first fresh air chamber 6 positioned at the top of the air-air heat exchange chamber 21, a second fresh air chamber 15 positioned at the bottom of the air-air heat exchange chamber 21, a wellhead heating room 1 and an air inlet shaft 2;
the top of one end of the air-air heat exchange chamber 21 is provided with a return air outlet 5 for discharging return air after heat exchange, the bottom of the other end of the air-air heat exchange chamber 21 is provided with a return air inlet 9, the return air inlet 9 is communicated with a return air shaft 12 through a return air channel 10, and a return air main fan 11 is arranged in the return air channel 10;
one end of the first fresh air chamber 6 is provided with a fresh air inlet 8, and a blower 7 for conveying fresh air is arranged in the first fresh air chamber 6 and close to the fresh air inlet 8; an air heat exchange device is vertically arranged in the air heat exchange chamber 21 and comprises a plurality of air heat exchange tubes 20, circulation tubes 20.1 are arranged in the air heat exchange tubes 20, the tops of the circulation tubes 20.1 are communicated with the first fresh air chamber 6, and the bottoms of the circulation tubes 20.1 are communicated with the second fresh air chamber 15; one end of the second fresh air chamber 15 is provided with an air supply outlet 3, the air supply outlet 3 is communicated with a wellhead heating room 1 through an air supply channel 4, and the wellhead heating room 1 is arranged at the top of the air inlet shaft 2;
the bottom of the wind-wind heat exchange chamber 21 is provided with a water collecting tank 20.2 for collecting condensed water.
The utility model also comprises a condensed water discharge unit, wherein the condensed water discharge unit comprises a pre-sedimentation sewage tank 19, and the top of the pre-sedimentation sewage tank is communicated with a water collecting tank 20.2 through a pipeline; the pre-precipitation sewage tank 19 also discharges pre-precipitated sewage through a drainage pipeline 17, and a sewage pump 16 is arranged on the drainage pipeline 17; the bottom of the pre-precipitation sewage tank 19 is provided with a sludge port 18 for cleaning the pre-precipitated sludge; the condensed water dropping from the circulating pipe 20.1 of the wind heat exchange pipe 20 is pre-precipitated by the condensed water discharge unit and then discharged, so that the pipeline is prevented from being blocked by the impurities of the condensed water.
A bypass air door 13 is arranged on the air return channel 10, the end part of the bypass air door 13 is arranged at a bypass air outlet 14 for discharging the return air, and the return air is directly discharged from the bypass air outlet 14 of the bypass air door 13 when the shaft is not required to be anti-frozen; when the shaft needs to be prevented from freezing in winter, the bypass exhaust outlet 14 is closed.
A guide plate is arranged in the first fresh air chamber 6 and is positioned beside the air feeder 7, and the guide plate reduces the resistance of the air feeder 7, thereby reducing the energy consumption of the air feeder 7.
The number of the blowers 7 is one or more, one or more blowers 7 are selected to be used according to the air supply quantity demand, and the rotating speed of the blowers 7 is adjusted according to the air supply quantity demand, so that the operation cost can be further reduced, and the practicability is good; the risk of freezing does not exist, and the system is further energy-saving.
The quantity of the wind and wind heat exchange devices in the wind and wind heat exchange chamber 21 is one group or multiple groups, the multiple groups of wind and wind heat exchange devices are arranged in the wind and wind heat exchange chamber 21 in parallel, and the anti-freezing heat load of a shaft is determined according to the outdoor environment temperature change, so that the quantity of the wind and wind heat exchange devices which are put into operation is selected.
The material of a circulating pipe 20.1 of the wind heat exchange pipe 20 in the wind heat exchange chamber 21 is stainless steel or copper pipe; the distance between the flow pipe 20.1 and the flow pipe 20.1 is more than or equal to 5 mm; can effectively avoid the gathering of buggy, effectively prevent the corrosion problems of comdenstion water, so the utility model discloses the problem of the dustiness big, corrosivity of having avoided the mine return air to accompany.
The utility model discloses in setting up in the wind heat transfer room 21 of near the outdoor open air ground of return air shaft or well head heating room, carry out abundant heat transfer with mine return air and outdoor new trend, the low-grade heat energy direct heating new trend in the usable mine return air is to satisfying the frost-proof requirement of pit shaft.
The utility model discloses a theory of operation:
mine return air of the return air shaft 12 enters the air-air heat exchange chamber 21 through the return air channel 10, the mine return air exchanges heat with fresh air in the circulating pipe 20.1 of the air-air heat exchange pipe 20 of the air-air heat exchange chamber 21, and the mine return air after heat exchange is discharged through the return air outlet 5 of the air-air heat exchange chamber 21;
fresh air enters the first fresh air chamber 6 through a fresh air inlet 8 of the first fresh air chamber 6, the fresh air enters a circulating pipe 20.1 of an air heat exchange pipe 20, the fresh air exchanges heat with mine return air in the circulating pipe 20.1 to heat up, the fresh air after heat exchange and temperature rise enters the second fresh air chamber 15, and then the fresh air is sent into the air inlet shaft 2 through the air supply channel 3 and the air return pipe 4.
The utility model discloses an useful part:
1. the utility model adopts the wind-wind heat exchange technology, no pollution, no combustion, no smoke discharge and no waste are generated in the actual operation process, the difficult problems of large dust content and corrosivity of mine return air are solved, only a small amount of electric energy is needed for the air feeder to supply fresh air, the installed power is small, the energy conservation and emission reduction of a coal mine can be realized, the operation cost is low, and the energy-saving effect is more remarkable;
2. the utility model fully utilizes the heat of the mine return air, utilizes the mine return air to directly heat the fresh air for preventing the shaft from freezing by a heat exchange technical means, has less intermediate links, realizes unpowered operation, has higher reliability, can be operated unattended and fully automatically;
3. the utility model effectively utilizes the low-grade heat source of the mine return air, the system is simple and reliable to operate, in addition, the utility model can selectively put the number or the rotating speed of the operating air feeder according to the change of the outdoor environment temperature and the anti-freezing heat load of the shaft, thereby further reducing the operating cost and having good practicability; meanwhile, because a wellhead heater is not needed, the risk of freezing does not exist, and the risk of frost cracking of the heat exchange tube in the wellhead heater caused by low water supply temperature in the replacement process of other clean energy sources can be avoided.
Claims (7)
1. The utility model provides a pit shaft anti-freezing system based on direct heat transfer formula heat recovery which characterized in that: the device comprises a return air shaft (12), a return air channel (10), an air-air heat exchange chamber (21), a first fresh air chamber (6) positioned at the top of the air-air heat exchange chamber (21), a second fresh air chamber (15) positioned at the bottom of the air-air heat exchange chamber (21), a wellhead heating room (1) and an air inlet shaft (2);
the top of one end of the air-air heat exchange chamber (21) is provided with a return air outlet (5) for discharging return air after heat exchange, the bottom of the other end of the air-air heat exchange chamber (21) is provided with a return air inlet (9), the return air inlet (9) is communicated with a return air shaft (12) through a return air channel (10), and a return air main fan (11) is arranged in the return air channel (10);
one end of the first fresh air chamber (6) is provided with a fresh air inlet (8), and a blower (7) for conveying fresh air is arranged in the first fresh air chamber (6) close to the fresh air inlet (8); an air heat exchange device is vertically arranged in the air heat exchange chamber (21), the air heat exchange device comprises a plurality of air heat exchange tubes (20), circulation tubes (20.1) are arranged in the air heat exchange tubes (20), the tops of the circulation tubes (20.1) are communicated with the first fresh air chamber (6), and the bottoms of the circulation tubes (20.1) are communicated with the second fresh air chamber (15); one end of the second fresh air chamber (15) is provided with an air supply outlet (3), the air supply outlet (3) is communicated with a wellhead heating room (1) through an air supply channel (4), and the wellhead heating room (1) is arranged at the top of the air inlet shaft (2);
the bottom of the wind-wind heat exchange chamber (21) is provided with a water collecting tank (20.2) for collecting condensed water.
2. The direct heat exchange heat energy recovery based wellbore freeze protection system of claim 1, wherein: the system also comprises a condensed water discharge unit, wherein the condensed water discharge unit comprises a pre-sedimentation sewage tank (19), and the top of the pre-sedimentation sewage tank is communicated with a water collecting tank (20.2) through a pipeline; the pre-precipitation sewage tank (19) also discharges pre-precipitated sewage through a drainage pipeline (17), and a sewage discharge pump (16) is arranged on the drainage pipeline (17); the bottom of the pre-sedimentation sewage tank (19) is provided with a sludge port (18) for cleaning the pre-precipitated sludge.
3. The direct heat exchange heat energy recovery based wellbore freeze protection system of claim 2, wherein: a bypass air door (13) is arranged on the return air channel (10), and the end part of the bypass air door (13) is arranged at a bypass air outlet (14) for discharging return air.
4. A wellbore freeze protection system based on direct heat exchange heat energy recovery according to any of claims 1-3, characterized in that: a guide plate is also arranged in the first fresh air chamber (6), and the guide plate is positioned at the side of the blower (7).
5. The direct heat exchange heat energy recovery based wellbore freeze protection system of claim 4, wherein: the number of the air blowers (7) is one or more.
6. The direct heat exchange heat energy recovery based wellbore freeze protection system of claim 5, wherein: the number of the wind and wind heat exchange devices in the wind and wind heat exchange chamber (21) is one group or multiple groups, and the multiple groups of wind and wind heat exchange devices are arranged in the wind and wind heat exchange chamber (21) in parallel.
7. The direct heat exchange heat energy recovery based wellbore freeze protection system of claim 6, wherein: the material of a circulating pipe (20.1) of the wind and wind heat exchange pipe (20) in the wind and wind heat exchange chamber (21) is stainless steel or a copper pipe; the distance between the circulating pipe (20.1) and the circulating pipe (20.1) is more than or equal to 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020251084.7U CN211692533U (en) | 2020-03-04 | 2020-03-04 | Shaft anti-freezing system based on direct heat exchange type heat energy recovery |
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| CN202020251084.7U CN211692533U (en) | 2020-03-04 | 2020-03-04 | Shaft anti-freezing system based on direct heat exchange type heat energy recovery |
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Cited By (3)
| 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 |
| CN113464189A (en) * | 2021-07-13 | 2021-10-01 | 中国矿业大学 | Automatic adjustable mine heat transfer device that airs exhaust that evenly distributes |
| CN114184064A (en) * | 2021-12-15 | 2022-03-15 | 中国矿业大学 | Vertical cross type mine return air heating fresh air heat exchanger and heat exchange method thereof |
-
2020
- 2020-03-04 CN CN202020251084.7U patent/CN211692533U/en active Active
Cited By (5)
| 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 |
| CN113464189A (en) * | 2021-07-13 | 2021-10-01 | 中国矿业大学 | Automatic adjustable mine heat transfer device that airs exhaust that evenly distributes |
| CN113464189B (en) * | 2021-07-13 | 2022-06-14 | 中国矿业大学 | Automatic adjustable mine heat transfer device that airs exhaust that evenly distributes |
| CN114184064A (en) * | 2021-12-15 | 2022-03-15 | 中国矿业大学 | Vertical cross type mine return air heating fresh air heat exchanger and heat exchange method thereof |
| CN114184064B (en) * | 2021-12-15 | 2024-03-08 | 中国矿业大学 | Vertical cross type mine return air heating fresh air heat exchanger and heat exchange method thereof |
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