CN220834878U - Pretreatment device for low-concentration gas for direct combustion heat supply - Google Patents
Pretreatment device for low-concentration gas for direct combustion heat supply Download PDFInfo
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- CN220834878U CN220834878U CN202322729534.5U CN202322729534U CN220834878U CN 220834878 U CN220834878 U CN 220834878U CN 202322729534 U CN202322729534 U CN 202322729534U CN 220834878 U CN220834878 U CN 220834878U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical group [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000779 smoke Substances 0.000 claims abstract description 51
- 230000018044 dehydration Effects 0.000 claims abstract description 38
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 38
- 238000005057 refrigeration Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 230000008929 regeneration Effects 0.000 claims abstract description 3
- 238000011069 regeneration method Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 34
- 230000005484 gravity Effects 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 25
- 239000006260 foam Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 143
- 238000000034 method Methods 0.000 abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000012535 impurity Substances 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008258 liquid foam Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a pretreatment device of low-concentration gas for direct combustion heat supply, belonging to the technical field of low-concentration gas direct combustion heat production; the device comprises a primary mechanical dehydration unit, a secondary lithium bromide refrigeration dehydration unit, a smoke heat regeneration unit and a filtering unit which are sequentially connected; the air inlet end of the primary mechanical dehydration unit is connected with a low-concentration gas outlet pipeline; the outlet of the filtering unit is connected with low-concentration gas direct-combustion heating equipment; the utility model dehydrates the low-concentration gas by two-stage dehydration equipment; after dehydration, heating and backheating are carried out by adopting a flue gas backheating device, the heat source is flue gas of the heating device, the relative moisture content of the gas is reduced, and free water of low-concentration gas is fully removed; the device effectively removes the water in the low-concentration gas and reduces the energy consumption in the low-concentration gas treatment process; the efficiency of the low-concentration gas direct-fired heating equipment is improved, and the safe, stable and efficient operation is ensured.
Description
Technical Field
The utility model belongs to the technical field of low-concentration gas direct-fired heating, and particularly relates to a low-concentration gas pretreatment device for direct-fired heat supply.
Background
The combustible component in the coal mine gas is mainly methane. For a long time, coal mine gas with methane concentration of 8% or more is mainly used for power generation, and gas with methane concentration of less than 8% is basically rarely utilized, is usually directly emptied, and is wasteful of energy and pollutes the environment. In recent years, the low-concentration gas direct combustion heat supply technology utilizes coal mine gas with methane concentration of 6% -8% to directly burn, replaces an electric boiler and a gas boiler to prepare hot water or steam, thereby meeting the requirements of mine heat, having the advantages of low cost, high heat conversion rate and the like, filling the blank of comprehensive utilization of the gas in the section, having wide application space and good social, environmental and economic benefits, and entering the engineering scientific research demonstration stage.
However, because the gas pumped by the coal mine gas drainage pump station carries a large amount of water and a small amount of dust underground, on one hand, the gas enters a metal fiber burner in the low-concentration gas direct-fired heating equipment, is easy to block, has poor combustion effect and high accident stopping rate, and affects the coal mine production; on the other hand, the combustion performance of the gas is directly affected by the moisture contained in the gas. In the low-concentration gas direct-fired heat supply equipment in the demonstration stage of engineering scientific research, only mechanical dehydration equipment is usually considered at the front section of the metal fiber burner, part of liquid water in the gas is removed, but the metal fiber burner is blocked after running for a period of time due to residual moisture and dust, so that the combustion effect is poor, and the shutdown times are high. At present, corresponding treatment equipment is provided for the treatment of water and impurities in the low-concentration gas, but the energy consumption is high, and the utilization value of the low-concentration gas is reduced intangibly.
Disclosure of utility model
The utility model overcomes the defects of the prior art and provides a pretreatment device for low-concentration gas for direct combustion heat supply. So as to effectively remove the water in the low-concentration gas and reduce the energy consumption in the treatment process of the low-concentration gas.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme.
The pretreatment device for low-concentration gas for direct combustion heat supply comprises a primary mechanical dehydration unit, a secondary lithium bromide refrigeration dehydration unit, a smoke heat regeneration unit and a filtering unit; the air inlet end of the primary mechanical dehydration unit is connected with a low-concentration gas outlet pipeline; the secondary lithium bromide refrigeration dehydration unit comprises a cooling heat exchanger and a steam type lithium bromide refrigeration unit which are connected; the gas outlet end of the primary mechanical dehydration unit is connected with a gas side inlet of the cooling heat exchanger; the inlet of the condenser side of the steam type lithium bromide refrigerating unit is connected with the steam pipeline of the low-concentration gas direct-combustion heating equipment through the steam pipeline, and the outlet of the condenser side of the steam type lithium bromide refrigerating unit is connected with the condensate tank through the condensate pipeline.
The smoke heat recovery unit comprises smoke heat recovery equipment, a high-temperature smoke pipeline and a low-temperature smoke pipeline; the gas side outlet of the cooling heat exchanger is connected with the gas side inlet of the smoke heat recovery device through a pipeline, the gas side inlet of the smoke heat recovery device is connected with the smoke pipeline of the low-concentration gas direct-fired heating device through a high-temperature smoke pipeline, and the gas side outlet of the smoke heat recovery device is communicated with the atmosphere through a low-temperature smoke pipeline; the gas side outlet of the smoke heat recovery device is connected with a filtering unit, and the outlet of the filtering unit is connected with a low-concentration gas direct-combustion heating device.
Further, the primary mechanical dewatering unit comprises a cyclone dewatering device and a gravity dewatering device; the low-concentration gas inlet pipeline is communicated with the side end of the upper part of the cyclone dehydrator, one end of the low-concentration gas outlet pipeline is inserted into the lower end of the cyclone dehydrator, the other end of the low-concentration gas outlet pipeline is connected with the side inlet of the gravity dehydrator through a pipeline, the pipeline at the inlet of the gravity dehydrator is inserted into the lower end of the gravity dehydrator, and the upper part of the gravity dehydrator is provided with a silk screen foam remover.
Furthermore, the cyclone dehydrator is tower-shaped, and the side end of the bottom of the cyclone dehydrator is connected with a first drainage pipeline through a first ball valve; the side end of the bottom of the gravity dehydrator is connected with a second drainage pipeline through a second ball valve.
Further, the upper side end of the silk screen demister is connected to a gas side inlet of the cooling heat exchanger through a pipeline, and the bottom of the cooling heat exchanger is connected with a third drainage pipeline through a third ball valve.
Further, the outlet of the water side of the cooling heat exchanger is connected with the inlet of the evaporator side of the steam type lithium bromide refrigeration unit through a circulating chilled water pump, the outlet of the generator side of the steam type lithium bromide refrigeration unit is connected with the inlet of the cooling tower through a pipeline, and the outlet of the cooling tower is connected with the inlet of the generator side of the steam type lithium bromide refrigeration unit through a lithium bromide circulating water pump.
Further, the filtering unit comprises a wire mesh filter; the gas side outlet of the smoke heat recovery device is connected with the inlet of the silk screen filter through a pipeline by using a butterfly valve, the outlet of the silk screen filter is connected with the inlet of the low-concentration gas direct-fired heating device through a pipeline by using a butterfly valve, and the inlet and the outlet of the silk screen filter are respectively provided with a pressure gauge.
Compared with the prior art, the utility model has the following beneficial effects:
1. The utility model dehydrates the low-concentration gas by two-stage dehydration equipment; after dehydration, heating and backheating are carried out by adopting a flue gas backheating device, the heat source is flue gas of the heating device, the relative moisture content of the gas is reduced, and free water of low-concentration gas is fully removed; the dust of low-concentration gas is removed by utilizing the screen filter, so that the efficiency of the low-concentration gas direct-fired heating equipment can be effectively improved, the safe, stable and efficient operation of the equipment is ensured, the moisture in the low-concentration gas is effectively removed in the process, and the energy consumption in the low-concentration gas treatment process is reduced.
2. According to the utility model, the lithium bromide refrigeration dehydration device is used for refrigeration, the refrigeration is realized by virtue of the characteristic that a great deal of steam heat energy (latent heat) provided by low-concentration gas direct-fired heating equipment is absorbed during the phase change of lithium bromide (refrigerant), only a cooling tower cooling fan motor, a pump group motor and a control instrument are used for electricity in the whole set of lithium bromide refrigeration dehydration device, and compared with an electric refrigeration dehydration unit, the lithium bromide refrigeration dehydration device has less electricity consumption, and the lithium bromide steam refrigeration electricity consumption is about 1/30-1/40 of that of electric refrigeration under the condition of equal flow gas. In addition, the lithium bromide refrigeration dehydration device uses steam generated by the heating equipment as power, the smoke backheating equipment uses smoke exhausted from the tail part of the heating equipment as a heat source, and the smoke backheating equipment is self-generated heat energy, so that the operation cost is low.
3. The utility model can remove all liquid water in the coal mine gas, ensure that the temperature is less than or equal to 40 ℃, the relative humidity is less than or equal to 80 percent (40 ℃) and the impurity particle size is less than or equal to 5um, thereby improving the efficiency of the low-concentration gas direct-fired heating equipment and ensuring the safe, stable and efficient operation of the equipment.
Drawings
Fig. 1 is a schematic connection diagram of a pretreatment device for low-concentration gas for direct combustion heat supply according to the present utility model.
In the figure, a 1-stage mechanical dehydration unit, a 11-cyclone dehydrator, a 12-gravity dehydrator, a 13-wire mesh foam remover, a 14-first ball valve, a 15-first drainage pipeline, a 16-second ball valve and a 17-second drainage pipeline;
The device comprises a 2-secondary lithium bromide refrigeration dehydration unit, a 21-cooling heat exchanger, a 22-steam type lithium bromide refrigeration unit, a 23-lithium bromide circulating water pump, a 24-cooling tower, a 25-steam pipeline, a 26-condensed water pipeline, a 27-circulating chilled water pump, a 28-third ball valve and a 29-third drainage pipeline;
3-smoke heat recovery unit, 31-smoke heat recovery device, 32-high temperature smoke pipeline, 33-low temperature smoke pipeline;
4-filtering units, 41-wire mesh filters, 42-butterfly valves, 43-pressure gauges and 44-bypass pipelines;
5-low concentration gas direct combustion heating equipment.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. The following describes the technical scheme of the present utility model in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
Referring to fig. 1, the present embodiment proposes a pretreatment device for low-concentration gas for direct combustion heat supply, which includes a primary mechanical dehydration unit 1, a secondary lithium bromide refrigeration dehydration unit 2, a flue gas heat recovery unit 3 and a filtration unit 4, which are sequentially connected.
The primary mechanical dewatering unit 1 comprises a cyclone dewatering device 11 and a gravity dewatering device 12; the cyclone dehydrator 11 is tower-shaped, a low-concentration gas inlet pipeline is communicated with the upper side end of the cyclone dehydrator 11, one end of a low-concentration gas outlet pipeline is inserted into the lower end of the cyclone dehydrator 11, the other end of the low-concentration gas outlet pipeline is connected with the side inlet of the gravity dehydrator 12 through a pipeline, and the bottom side end of the cyclone dehydrator 11 is connected with the first drainage pipeline 15 through a first ball valve 14; the pipeline at the inlet of the gravity dehydrator 12 is inserted into the lower end of the gravity dehydrator 12, the side end of the bottom of the gravity dehydrator 12 is connected with a second drainage pipeline 17 through a second ball valve 16, and a silk screen foam remover 13 is arranged at the upper part of the gravity dehydrator 12.
The secondary lithium bromide refrigeration dehydration unit 2 comprises a cooling heat exchanger 21, a steam type lithium bromide refrigeration unit 22, a lithium bromide circulating water pump 23, a cooling tower 24, a steam pipeline 25, a condensed water pipeline 26, a circulating chilled water pump 27, a third ball valve 28 and a third drainage pipeline 29.
The upper side end of the wire mesh foam remover 13 is connected to a gas side inlet of the cooling heat exchanger 21 through a pipeline, the bottom of the cooling heat exchanger 21 is connected with a third drainage pipeline 29 through a third ball valve 28, a water side outlet of the cooling heat exchanger 21 is connected with an inlet on the evaporator side of the steam type lithium bromide refrigerator set 22 through a circulating chilled water pump 27, the water side inlet of the cooling heat exchanger 21 is connected with an outlet on the evaporator side of the steam type lithium bromide refrigerator set 22 through a pipeline, a generator side outlet of the steam type lithium bromide refrigerator set 22 is connected with an inlet on the generator side of the cooling tower 24 through a pipeline, an outlet on the condenser side of the steam type lithium bromide refrigerator set 22 is connected with a steam pipeline of the low-concentration gas direct-fired heating device 5 through a steam pipeline 25, and a condenser side outlet of the steam type lithium bromide refrigerator set 22 is connected with a condensate tank through a condensate water pipeline 26.
The smoke heat recovery unit 3 comprises a smoke heat recovery device 31, a high-temperature smoke pipeline 32 and a low-temperature smoke pipeline 33; the filter unit 4 comprises a wire filter 41, a butterfly valve 42, a pressure gauge 43 and a bypass conduit 44. The gas side outlet of the cooling heat exchanger 21 is connected with the gas side inlet of the smoke heat recovery device 31 through a pipeline, the gas side outlet of the smoke heat recovery device 31 is connected with the inlet of the screen filter 41 through a butterfly valve 42 by utilizing a pipeline, the gas side inlet of the smoke heat recovery device 31 is connected with the gas pipeline of the low-concentration gas direct-fired heating device 5 through a high-temperature gas pipeline 32, and the gas side outlet of the smoke heat recovery device 31 is communicated with the atmosphere through a low-temperature gas pipeline 33.
The outlet of the screen filter 41 is connected with the inlet of the low-concentration gas direct-fired heating equipment 5 through a butterfly valve 42 by a pipeline, and the inlet and outlet of the screen filter 41 are respectively provided with a pressure gauge 43, a bypass pipeline 44 and the butterfly valve 42.
It should be noted that: the silk screen foam remover 13 mainly comprises a silk screen, a silk screen grating, a silk screen block and a supporting device for fixing the silk screen block, wherein the silk screen is a gas-liquid filter screen made of various materials, and the gas-liquid filter screen can be composed of metal or nonmetal wires; the lithium bromide circulating water pump 23 and the circulating chilled water pump 27 are both subjected to variable frequency regulation; the wire mesh in the wire mesh filter 41 is desirably composed of a non-metal mesh.
The specific working process of the pretreatment device in this embodiment is as follows:
The low-concentration gas containing excessive liquid water from a coal mine gas drainage pump station firstly enters a cyclone dehydrator 11, carried water drops collide with the inner wall of the cyclone dehydrator 11 under the action of centrifugal force, the kinetic energy is lost to separate from the gas, and the gas drops to the bottom of the cyclone dehydrator 11 to be discharged through a first drainage pipeline 15; the low-concentration gas separated from most of the liquid water enters the gravity dehydrator 12, and after the direction of the gas flow is changed, the rest small part of the liquid water is separated from the low-concentration gas under the action of gravity and inertia force and falls to the bottom of the gravity dehydrator 12 to be discharged by the second drainage pipeline 17; the low-concentration gas passes through a silk screen foam remover 13 at the upper part of the gravity dehydrator 12 to remove tiny liquid foam, so as to ensure that liquid water contained in the low-concentration gas is thoroughly removed, and then enters the secondary lithium bromide refrigeration dehydration unit 2.
The secondary lithium bromide refrigeration dehydration unit 2 adopts a steam type lithium bromide refrigeration unit 22, steam is provided by low-concentration gas direct-fired heating equipment 5, circulating cooling water of the steam type lithium bromide refrigeration unit 22 is provided by a cooling tower 24, the steam type lithium bromide refrigeration unit 22 provides 10/15 ℃ of chilled water and is communicated with a cooling heat exchanger 21, the low-concentration gas entering the cooling heat exchanger 21 is cooled, the temperature of the low-concentration gas is reduced from 40 ℃ to 25 ℃ and the temperature difference is 15 ℃, so that free water in the low-concentration gas is removed, and the removed free water is discharged from a third drainage pipeline 29 at the bottom end of the cooling heat exchanger 21.
The smoke backheating unit 3 adopts the smoke backheating equipment 31, the required heat source is the smoke exhausted from the tail of the low-concentration gas direct-fired heating equipment 5, the low-concentration gas entering the smoke backheating equipment 31 is heated, and the outlet temperature is ensured to be less than or equal to 40 ℃ and the relative humidity is ensured to be less than or equal to 80% (40 ℃).
Filtering residual fine impurities in the dehydrated low-concentration gas by a wire mesh filter 41 to ensure that the particle size of impurities contained in the gas at an outlet is less than or equal to 5 mu m so as to meet the requirement of the fuel quality of the low-concentration gas direct-fired heating equipment 5; the inlet and outlet of the screen filter 41 are provided with a pressure gauge 43 on site, and whether the screen needs to be replaced or not is judged according to the pressure difference; when the filter screen is replaced, the valve 42 on the bypass pipeline 44 is opened first, and then the inlet and outlet valves 42 of the screen filter 41 are closed, so that the normal operation of the low-concentration gas direct-fired heating equipment 5 is not affected.
Taking a 2t/h low-concentration gas steam boiler as an example: the rated pressure of the boiler is 1.25MPa, the low-concentration gas with the methane concentration of 8 percent is combusted, the rated gas quantity is about 1875Nm 3/h, saturated steam with the pressure of 0.6MPa (the temperature of 165 ℃) is produced, and the gas quantity generated by the low-concentration gas steam boiler is 2200Nm 3/h (157 ℃); the low-concentration gas passes through the first-stage mechanical dehydration unit 1, firstly enters the cyclone dehydrator 11, carried water drops collide with the inner wall of the cyclone dehydrator 11 under the action of centrifugal force, the kinetic energy is lost to be separated from the gas, the low-concentration gas separated from most of liquid water enters the gravity dehydrator 12, after the direction of the gas flow is changed, the rest small part of liquid water is separated from the low-concentration gas under the action of gravity and inertia force and falls to the bottom of the gravity dehydrator 12, the water separated from the cyclone dehydrator 11 and the gravity dehydrator 12 is discharged through a drain pipeline at the bottom, and the rated treatment capacity of the first-stage mechanical dehydration unit 1 is about 1875Nm 3/h; then the low-concentration gas enters a secondary lithium bromide refrigeration dehydration unit 2, the moisture content of the low-concentration gas is reduced by reducing the temperature, the temperature of the low-concentration gas is reduced from 40 ℃ to 25 ℃, the relative moisture content of the gas reaches 100%, all liquid water is removed, the water displacement in the cooling process is about 66kg/h, the refrigeration capacity of the secondary lithium bromide refrigeration dehydration unit 2 is 60kW, the water inlet and outlet temperature of chilled water is 15/10 ℃, the water flow rate of chilled water is 10.3m 3/h, the water inlet and outlet temperature of cooling water is 32/41 ℃, the water flow rate of cooling water is 14.8m 3/h, and the steam consumption is 0.157t/h; the low-concentration gas enters a smoke backheating unit 3, the temperature of the low-concentration gas is raised from 25 ℃ to 40 ℃ by using the smoke (2200 Nm 3/h, 157 ℃) at the outlet of a low-concentration gas steam boiler as a heat source, the relative moisture content of the gas is less than or equal to 80% (40 ℃) so as to ensure that no liquid water is separated out, the heat exchange amount of the smoke backheating unit 3 is 60kW, and the temperature of the smoke outlet is 85 ℃ after heat exchange; and then the low-concentration gas enters a filtering unit 4 to filter out part of impurities in the low-concentration gas, so that the particle size of the impurities in the gas at the outlet is less than or equal to 5 mu m, and the requirement of the fuel quality of the low-concentration gas direct-fired heating equipment is met.
Example 2
Taking a 4t/h low-concentration gas steam boiler as an example: the rated pressure of the boiler is 1.25MPa, the low-concentration gas with the methane concentration of 8 percent is combusted, the rated gas quantity is about 3750Nm 3/h, saturated steam with the pressure of 0.6MPa (the temperature is 165 ℃) is produced, and the gas quantity 4400Nm 3/h (157 ℃) is produced by the low-concentration gas steam boiler; the low-concentration gas passes through the first-stage mechanical dehydration unit 1, firstly enters the cyclone dehydrator 11, carried water drops collide with the inner wall of the cyclone dehydrator 11 under the action of centrifugal force, the kinetic energy is lost to be separated from the gas, the low-concentration gas separated from most of liquid water enters the gravity dehydrator 12, after the direction of the gas flow is changed, the rest small part of liquid water is separated from the low-concentration gas under the action of gravity and inertia force and falls to the bottom of the gravity dehydrator 12, the water separated from the cyclone dehydrator 11 and the gravity dehydrator 12 is discharged through a drain pipeline at the bottom, and the rated treatment capacity of the first-stage mechanical dehydration unit 1 is about 3750Nm 3/h; then the low-concentration gas enters a secondary lithium bromide refrigeration dehydration unit 2, the moisture content of the low-concentration gas is reduced by reducing the temperature, the temperature of the low-concentration gas is reduced from 40 ℃ to 25 ℃, the relative moisture content of the gas reaches 100%, all liquid water is removed, the water displacement in the cooling process is 132kg/h, the refrigeration capacity of the secondary lithium bromide refrigeration dehydration unit 2 is 120kW, the water inlet and outlet temperature of chilled water is 15/10 ℃, the water flow rate of chilled water is 20.6m 3/h, the water inlet and outlet temperature of cooling water is 32/41 ℃, the water flow rate of cooling water is 29.6m 3/h, and the steam consumption is 0.31t/h; the low-concentration gas enters a smoke heat recovery unit 3, the temperature of the low-concentration gas is increased from 25 ℃ to 40 ℃ by taking the smoke (4400 Nm 3/h, 157 ℃) at the outlet of a low-concentration gas steam boiler as a heat source, the relative moisture content of the gas is less than or equal to 80% (40 ℃) so as to ensure that no liquid water is separated out, the heat exchange amount of the smoke heat recovery unit 3 is 120kW, and the temperature of the smoke outlet is 85 ℃ after heat exchange; and then the low-concentration gas enters a filtering unit 4 to filter out part of impurities in the low-concentration gas, so that the particle size of the impurities in the gas at the outlet is less than or equal to 5 mu m, and the requirement of the fuel quality of the low-concentration gas direct-fired heating equipment is met.
While the utility model has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the utility model pertains without departing from the scope of the utility model defined by the appended claims.
Claims (6)
1. The pretreatment device for the low-concentration gas for direct combustion heat supply is characterized by comprising a primary mechanical dehydration unit (1), a secondary lithium bromide refrigeration dehydration unit (2), a smoke heat regeneration unit (3) and a filtering unit (4); the air inlet end of the primary mechanical dehydration unit (1) is connected with a low-concentration gas outlet pipeline; the secondary lithium bromide refrigeration dehydration unit (2) comprises a cooling heat exchanger (21) and a steam type lithium bromide refrigeration unit (22) which are connected; the air outlet end of the primary mechanical dehydration unit (1) is connected with the gas side inlet of the cooling heat exchanger (21); the inlet of the condenser side of the steam type lithium bromide refrigerating unit (22) is connected with a steam pipeline of the low-concentration gas direct-fired heating equipment (5) through a steam pipeline (25), and the outlet of the condenser side of the steam type lithium bromide refrigerating unit (22) is connected with a condensate tank through a condensate pipeline (26);
The smoke heat recovery unit (3) comprises smoke heat recovery equipment (31), a high-temperature smoke pipeline (32) and a low-temperature smoke pipeline (33); the gas side outlet of the cooling heat exchanger (21) is connected with the gas side inlet of the smoke heat recovery device (31) through a pipeline, the gas side inlet of the smoke heat recovery device (31) is connected with the gas pipeline of the low-concentration gas direct-fired heating device (5) through a high-temperature gas pipeline (32), and the gas side outlet of the smoke heat recovery device (31) is led to the atmosphere through a low-temperature gas pipeline (33); the gas side outlet of the smoke heat recovery device (31) is connected with the filtering unit (4), and the outlet of the filtering unit (4) is connected with the low-concentration gas direct-fired heating device (5).
2. Pretreatment device of low-concentration gas for direct combustion heating according to claim 1, characterized in that the primary mechanical dewatering unit (1) comprises a cyclone (11) and a gravity (12) dewaterer; the low-concentration gas inlet pipeline is communicated with the side end of the upper part of the cyclone dehydrator (11), one end of the low-concentration gas outlet pipeline is inserted into the lower end of the cyclone dehydrator (11), the other end of the low-concentration gas outlet pipeline is connected with the side inlet of the gravity dehydrator (12) through a pipeline, the pipeline at the inlet of the gravity dehydrator (12) is inserted into the lower end of the gravity dehydrator (12), and the upper part of the gravity dehydrator (12) is provided with a silk screen foam remover (13).
3. The pretreatment device of low-concentration gas for direct combustion heat supply according to claim 2, wherein the cyclone dehydrator (11) is tower-shaped, and the bottom side end of the cyclone dehydrator (11) is connected with the first drainage pipeline (15) through the first ball valve (14); the side end of the bottom of the gravity dehydrator (12) is connected with a second drainage pipeline (17) through a second ball valve (16).
4. The pretreatment device for low-concentration gas for direct combustion heat supply according to claim 2, wherein the upper side end of the wire mesh demister (13) is connected to the gas side inlet of the cooling heat exchanger (21) through a pipeline, and the bottom of the cooling heat exchanger (21) is connected with a third drainage pipeline (29) through a third ball valve (28).
5. The pretreatment device for low-concentration gas for direct combustion heat supply according to claim 1, wherein a water side outlet of the cooling heat exchanger (21) is connected with an inlet of an evaporator side of the steam type lithium bromide refrigeration unit (22) through a circulating chilled water pump (27), a generator side outlet of the steam type lithium bromide refrigeration unit (22) is connected with an inlet of a cooling tower (24) through a pipeline, and an outlet of the cooling tower (24) is connected with a generator side inlet of the steam type lithium bromide refrigeration unit (22) through a lithium bromide circulating water pump (23).
6. Pretreatment device for low-concentration gas for direct combustion heating according to claim 1, characterized in that the filtering unit (4) comprises a wire mesh filter (41); the gas side outlet of the smoke heat recovery device (31) is connected with the inlet of the screen filter (41) through a butterfly valve by using a pipeline, the outlet of the screen filter (41) is connected with the inlet of the low-concentration gas direct-fired heating device (5) through a butterfly valve by using a pipeline, and the inlets and outlets of the screen filter (41) are respectively provided with a pressure gauge (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322729534.5U CN220834878U (en) | 2023-10-11 | 2023-10-11 | Pretreatment device for low-concentration gas for direct combustion heat supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322729534.5U CN220834878U (en) | 2023-10-11 | 2023-10-11 | Pretreatment device for low-concentration gas for direct combustion heat supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220834878U true CN220834878U (en) | 2024-04-26 |
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|---|---|---|---|
| CN202322729534.5U Active CN220834878U (en) | 2023-10-11 | 2023-10-11 | Pretreatment device for low-concentration gas for direct combustion heat supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220834878U (en) |
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2023
- 2023-10-11 CN CN202322729534.5U patent/CN220834878U/en active Active
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