CN210638473U - Flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas - Google Patents
Flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas Download PDFInfo
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- CN210638473U CN210638473U CN201920783401.7U CN201920783401U CN210638473U CN 210638473 U CN210638473 U CN 210638473U CN 201920783401 U CN201920783401 U CN 201920783401U CN 210638473 U CN210638473 U CN 210638473U
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Abstract
The utility model discloses an utilize low concentration gas to realize flue gas waste heat utilization equipment of wet material stoving in colliery, a serial communication port, it includes: the device comprises a mixing device, a heat storage oxidation device, a chimney, an internal combustion engine set, a first flue gas heat exchange device, a gas mixing device, a second flue gas heat exchange device, a scattering device, a first conveyor, a flue gas dryer, a second conveyor, a cyclone dust collector and a wet dust collector.
Description
Technical Field
The utility model belongs to colliery low concentration gas utilization, waste heat recovery utilize field, concretely relates to utilize low concentration gas to realize flue gas waste heat utilization equipment that colliery wet material was dried.
Background
Gas is the second only of the main greenhouse gas of carbon dioxide, and the greenhouse effect produced by unit mass of gas is equivalent to 21 times of that of the same mass of carbon dioxide. In coal mining, a large amount of gas is often associated at the same time, which is one of main gas industrial emission sources, so that the gas emission of a coal mine is reduced, and the emission of greenhouse gas can be effectively reduced. Meanwhile, the main component of coal mine gas is methane, which is a high-quality clean gas energy source. If the gas with different concentrations in the coal mine production process is collected and utilized, the coal mine gas accident can be effectively solved, the production living conditions of a mining area are improved, the increase of clean energy supply and the reduction of greenhouse gas emission are facilitated, and the multiple targets of life protection, resource saving and environment protection are achieved.
The regulation in the coal mine safety regulations in China is as follows: the concentration of methane in the ventilation gas is not higher than 0.75%, and actually, in order to ensure the production safety of mines, the concentration of each coal mine is generally controlled to be about 0.3%. Currently, due to the great reduction of the income of the international Clean Development Mechanism (CDM), the pure oxidation of the ventilation air methane has no economic benefit, for example, 6 ten thousand ventilation air methane oxidation projects of Chongqing Song algae Ministry and Zheng coal group are stopped. In addition, the oxygen content of hot wind discharged by the heat accumulation oxidation device is relatively high, and specific combustible materials such as coal slime are easily oxidized or spontaneously combusted.
At present, a patent technology for drying coal slime in a coal mine by using low-concentration gas oxidation is an integrated system of ultra-low-concentration gas oxidation power generation, coal slime drying and cooling heat (patent number 201610060288.0), and the system is mainly characterized in that high-temperature smoke generated by low-concentration oxidation drives a waste heat boiler to generate high-temperature high-pressure steam, then the high-temperature high-pressure steam is subjected to temperature and pressure reduction through a temperature and pressure reduction device, and the coal slime is dried by using the steam subjected to temperature and pressure reduction. The technology has the following technical limitations that firstly, high-temperature high-pressure steam is directly subjected to temperature reduction and pressure reduction to cause a large amount of high-quality energy waste, and secondly, aiming at coal slime with extremely high humidity, only superheated steam with lower pressure and temperature is utilized, so that complete drying of the coal slime cannot be realized.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in design, the dependable performance utilizes low concentration gas to realize the flue gas waste heat utilization equipment that the wet material in colliery was dried.
The utility model provides a technical scheme that above-mentioned problem adopted is: this utilize low concentration gas to realize flue gas waste heat utilization equipment of wet material stoving in colliery, its structural feature lies in that it includes: the system comprises a mixing device, a heat storage oxidation device, a chimney, an internal combustion engine set, a first flue gas heat exchange device, a gas mixing device, a second flue gas heat exchange device, a scattering device, a first conveyor, a flue gas dryer, a second conveyor, a cyclone dust collector and a wet dust collector, wherein a gas outlet of the mixing device is connected with a gas inlet of the heat storage oxidation device, a gas concentration measuring instrument is arranged at a gas outlet of the mixing device, a low-temperature flue gas outlet of the heat storage oxidation device is respectively connected with a flue gas inlet of the mixing device and a flue gas inlet of the chimney, a second valve and a third valve are respectively arranged at the flue gas inlet of the mixing device and the flue gas inlet of the chimney, a high-temperature flue gas outlet of the heat storage oxidation device is respectively connected with a high-temperature flue gas inlet of the gas mixing device and the flue gas inlet of the second flue gas heat exchange device, and a sixth valve and a seventh valve are respectively arranged at the high-, the smoke outlet of the internal combustion engine set is respectively connected with the low-temperature smoke inlet of the gas mixing device and the smoke inlet of the first smoke heat exchange device, the low-temperature smoke inlet of the gas mixing device and the smoke inlet of the first smoke heat exchange device are respectively provided with a fifth valve and a fourth valve, the smoke outlet of the first smoke heat exchange device and the smoke outlet of the second smoke heat exchange device are simultaneously connected with the smoke inlet of a chimney, the smoke outlet of the gas mixing device is connected with the smoke inlet of a smoke drier, the smoke outlet of the gas mixing device is provided with an oxygen concentration measuring instrument and a temperature measuring instrument, the feed inlet of the scattering device is connected with coal mine wet materials, the discharge outlet of the scattering device is connected with the feed inlet of a first conveyor, the discharge outlet of the first conveyor is connected with the feed inlet of the smoke drier, and the smoke outlet of the smoke drier is connected with the smoke inlet of a cyclone dust collector, the discharge port of the flue gas dryer is connected with the feed inlet of the second conveyor, the powder outlet of the cyclone dust collector is connected with the feed inlet of the second conveyor, the flue gas outlet of the cyclone dust collector is connected with the flue gas inlet of the wet dust collector, and the flue gas outlet of the wet dust collector is connected with the flue gas inlet of the chimney.
Further, the mixing device is provided with gas inlet, air intlet and gas access, the gas inlet of mixing device and heat accumulation oxidation unit's low temperature exhanst gas outlet are connected, and install the second valve at mixing device's gas inlet, mixing device's air intlet is connected with fresh air, and installs first valve at mixing device's air intlet, mixing device's gas access connection has low concentration gas, the concentration of low concentration gas is less than 8%.
Further, the internal combustion engine group is provided with a gas inlet, the gas inlet of the internal combustion engine group is connected with gas with other concentrations, and the concentration of the gas with other concentrations is greater than or equal to 8%.
Further, the first flue gas heat exchange device comprises a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger and the like, and is used for recycling flue gas waste heat and providing refrigeration, heating and domestic hot water for various users in coal mines.
Further, the second flue gas heat exchange device comprises a waste heat boiler, a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger and the like, and is used for recycling flue gas waste heat and providing electric power, refrigeration, heating and domestic hot water for various users in a coal mine.
Further, the exhaust gas of the flue gas dryer is dedusted by a two-stage dedusting device.
Furthermore, an oxygen concentration measuring instrument and a temperature measuring instrument are arranged at a flue gas outlet of the gas mixing device, the opening degrees of the sixth valve and the fifth valve are guided to be adjusted by measuring the oxygen concentration value and the temperature value, and the high-temperature flue gas flow and the low-temperature flue gas flow entering the gas mixing device are adjusted, so that the gas mixing device is controlled to obtain mixed flue gas with the oxygen concentration of less than 14%, the temperature of the mixed flue gas is controlled, and spontaneous combustion of coal mine wet materials in a flue gas dryer is prevented.
Furthermore, a gas concentration measuring instrument is arranged at an outlet of the blending device, the opening degrees of the first valve and the second valve are guided and adjusted by utilizing a gas concentration value measured by the gas concentration measuring instrument, and the flow of fresh air and the flow of low-temperature flue gas entering the blending device are adjusted, so that the blending device is controlled to obtain a gas mixture with the gas concentration ranging from 0.3% to 1.2%.
Compared with the prior art, the utility model, have following advantage and effect: reasonable in design, simple structure, the dependable performance, rational design utilizes low concentration gas to realize the waste heat comprehensive utilization system that the wet material in colliery was dried to realize: the gas concentration of the gas mixture entering the heat-storage oxidation device is reasonably controlled, so that the running performance and running safety and reliability of the heat-storage oxidation device are improved; the tail gas of the internal combustion engine with lower oxygen concentration and lower temperature is effectively utilized, the oxygen concentration and the mixed flue gas temperature in the mixed flue gas conveyed by the gas mixing device are reasonably controlled, the control on the oxygen concentration in the mixed flue gas is enhanced, the coal mine wet material is prevented from being combusted in the drying process, and the operation safety of the flue gas drying device is improved; when satisfying the wet material in colliery and carrying out the drying, abundant recycle has satisfied all kinds of user's in colliery power consumption, heating, refrigeration, life hot water etc. different with the ability demand, has increased the economic added value of this technique, it is from this visible, the utility model discloses great in-service use is worth having.
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Fig. 1 is the embodiment of the utility model provides an in utilize low concentration gas to realize the flue gas waste heat utilization equipment's of wet material stoving in colliery schematic diagram.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the flue gas waste heat utilization device for drying wet coal mine materials by using low-concentration gas in the embodiment includes a mixing device 1, a heat storage oxidation device 2, a chimney 3, an internal combustion engine group 4, a first flue gas heat exchange device 5, a gas mixing device 6, a second flue gas heat exchange device 7, a scattering device 8, a first conveyor 9, a flue gas dryer 10, a second conveyor 11, a cyclone dust collector 12 and a wet dust collector 13.
In this embodiment, the gas outlet of the blending device 1 is connected to the gas inlet of the thermal storage oxidation device 2, the gas concentration measuring instrument 25 is installed at the gas outlet of the blending device 1, the low-temperature flue gas outlet of the thermal storage oxidation device 2 is connected to the flue gas inlet of the blending device 1 and the flue gas inlet of the chimney 3, the second valve 22 and the third valve 23 are installed at the flue gas inlet of the blending device 1 and the flue gas inlet of the chimney 3, the high-temperature flue gas outlet of the thermal storage oxidation device 2 is connected to the high-temperature flue gas inlet of the gas mixing device 6 and the flue gas inlet of the second flue gas heat exchange device 7, and the sixth valve 28 and the seventh valve 29 are installed at the high-temperature flue gas inlet of the gas mixing device 6 and the flue gas inlet of the second flue gas heat.
In this embodiment, the flue gas outlet of the internal combustion engine group 4 is connected to the low-temperature flue gas inlet of the gas mixing device 6 and the flue gas inlet of the first flue gas heat exchange device 5, the low-temperature flue gas inlet of the gas mixing device 6 and the flue gas inlet of the first flue gas heat exchange device 5 are provided with the fifth valve 27 and the fourth valve 26, the flue gas outlet of the first flue gas heat exchange device 5 and the flue gas outlet of the second flue gas heat exchange device 7 are connected to the flue gas inlet of the chimney 3, the flue gas outlet of the gas mixing device 6 is connected to the flue gas inlet of the flue gas dryer 10, and the flue gas outlet of the gas mixing device 6 is provided with the oxygen concentration measuring instrument 30 and the temperature measuring instrument 31.
The feed inlet of the scattering device 8 in this embodiment is connected with coal mine wet materials 104, the discharge outlet of the scattering device 8 is connected with the feed inlet of the first conveyor 9, the discharge outlet of the first conveyor 9 is connected with the feed inlet of the flue gas dryer 10, the flue gas outlet of the flue gas dryer 10 is connected with the flue gas inlet of the cyclone dust collector 12, the discharge outlet of the flue gas dryer 10 is connected with the feed inlet of the second conveyor 11, the powder outlet of the cyclone dust collector 12 is connected with the feed inlet of the second conveyor 11, the flue gas outlet of the cyclone dust collector 12 is connected with the flue gas inlet of the wet dust collector 13, and the flue gas outlet of the wet dust collector 13 is connected with the flue gas inlet of the chimney 3.
In this embodiment, the blending device 1 is provided with a flue gas inlet, an air inlet and a gas inlet, the flue gas inlet of the blending device 1 is connected with the low-temperature flue gas outlet of the thermal storage oxidation device 2, a second valve 22 is installed at the flue gas inlet of the blending device 1, the air inlet of the blending device 1 is connected with fresh air 101, a first valve 21 is installed at the air inlet of the blending device 1, the gas inlet of the blending device 1 is connected with low-concentration gas 102, and the concentration of the low-concentration gas 102 is less than 8%.
In the embodiment, the internal combustion engine set 4 is provided with a gas inlet, the gas inlet of the internal combustion engine set 4 is connected with other gas concentration 103, and the concentration of the other gas concentration 103 is greater than or equal to 8%.
In this embodiment, the first flue gas heat exchange device 5 includes a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger, and is used for recycling flue gas waste heat and providing refrigeration, heating and domestic hot water for various users in a coal mine; the second flue gas heat exchange device 7 comprises a waste heat boiler, a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger and the like, and is used for recycling flue gas waste heat and providing electric power, refrigeration, heating and domestic hot water for various users in a coal mine.
In the present embodiment, the exhaust gas of the flue gas dryer 10 is dedusted by means of a two-stage dedusting device.
In this embodiment, the flue gas outlet of the gas mixing device 6 is provided with an oxygen concentration measuring instrument 30 and a temperature measuring instrument 31, and the opening degrees of the sixth valve 28 and the fifth valve 27 are guided to be adjusted by measuring the oxygen concentration value and the temperature value, and the flow rate of the high-temperature flue gas and the low-temperature flue gas entering the gas mixing device 6 are adjusted, so that the gas mixing device 6 is controlled to obtain the mixed flue gas with the oxygen concentration of less than 14%, the temperature of the mixed flue gas is controlled, and spontaneous combustion of the wet coal mine material in the flue gas drying machine 10 is prevented.
In this embodiment, a gas concentration measuring instrument 25 is disposed at an outlet of the blending device 1, and the opening degrees of the first valve 21 and the second valve 22 are guided and adjusted by using a gas concentration value measured by the gas concentration measuring instrument 25, and the flow rate of fresh air and the flow rate of low-temperature flue gas entering the blending device 1 are adjusted, so that the blending device 1 is controlled to obtain a gas mixture with a gas concentration range of 0.3-1.2%.
The adjusting method of the flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas comprises the following steps:
the first valve 21 and the second valve 22 are opened and adjusted, low-concentration gas 102 with the concentration less than 8% enters the mixing device 1 to be mixed with fresh air 101 and low-temperature flue gas from the thermal storage oxidation device 2 to obtain gas mixed gas with the gas concentration range of 0.3-1.2%, the gas mixed gas enters the thermal storage oxidation device 2 to be oxidized to generate high-temperature flue gas and low-temperature flue gas, the third valve 23 is opened and adjusted, redundant low-temperature flue gas is discharged through the chimney 3, the sixth valve 28 and the seventh valve 29 are opened and adjusted, the high-temperature flue gas respectively enters the gas mixing device 6 and the second flue gas heat exchange device 7, and the high-temperature flue gas generated by the thermal storage oxidation device 2 is subjected to waste heat recovery in the second flue gas heat exchange device 7 and then is discharged to the outside through the chimney 3.
And opening and adjusting the fourth valve 26 and the fifth valve 27, allowing the gas 103 with the concentration of more than 8% and other concentrations to enter the internal combustion engine set 4 for combustion and power application to generate flue gas, and allowing the flue gas to enter the first flue gas heat exchange device 5 and the gas mixing device 6 respectively, and allowing the flue gas generated by the internal combustion engine set 4 to be subjected to waste heat recovery in the first flue gas heat exchange device 5 and then to be discharged through the chimney 3.
The high-temperature flue gas from the thermal storage oxidation device 2 and the low-temperature flue gas from the internal combustion engine set 4 are mixed in the gas mixing device 6 to obtain mixed flue gas with the oxygen concentration less than 14 percent, the mixed flue gas enters the flue gas dryer 10, the coal mine wet material 104 enters the scattering device 8, crushing large-particle materials in the coal mine wet materials 104, conveying the crushed coal mine wet materials 104 to a flue gas dryer 10 through a first conveyor 9, heating the crushed coal mine wet materials 104 by mixed flue gas from a gas mixing device 6 to form dried materials, then the flue gas is conveyed to a material storage place by a second conveyor 11, the flue gas discharged by the flue gas drier 10 firstly passes through a cyclone dust collector 12 for primary dust removal, then the dust enters a wet dust collector 13 for secondary dust collection, and finally the dust is discharged through a chimney 3, and the dust material collected by the cyclone dust collector 12 is recovered and is conveyed to a material storage place through a second conveyor 11.
At this time, the opening degree of the first valve 21 and the opening degree of the second valve 22 are guided to be adjusted by using the gas concentration value measured by the gas concentration measuring instrument 25, and the flow rate of fresh air and the flow rate of low-temperature flue gas entering the blending device 1 are adjusted, so that the blending device 1 is controlled to obtain the gas mixture with the gas concentration range of 0.3-1.2%.
The oxygen concentration value and the temperature value measured by the oxygen concentration measuring instrument 30 and the temperature measuring instrument 31 are used for guiding and adjusting the opening degrees of the sixth valve 28 and the fifth valve 27, and the high-temperature flue gas flow and the low-temperature flue gas flow entering the gas mixing device 6 are adjusted, so that the gas mixing device 6 is controlled to obtain mixed flue gas with the oxygen concentration less than 14%, the temperature of the mixed flue gas is controlled, and spontaneous combustion of coal mine wet materials in the flue gas drying machine 10 is prevented.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The utility model provides an utilize low concentration gas to realize flue gas waste heat utilization equipment of wet material stoving in colliery which characterized in that includes: mixing device (1), heat accumulation oxidation unit (2), chimney (3), internal combustion engine group (4), first flue gas heat transfer device (5), mix gas device (6), second flue gas heat transfer device (7), break up device (8), first conveyer (9), flue gas drier (10), second conveyer (11), cyclone (12) and wet dust collector (13), the gas outlet of mixing device (1) is connected with the air inlet of heat accumulation oxidation unit (2), and installs gas concentration measurement appearance (25) at the gas outlet of mixing device (1), the low temperature exhanst gas outlet of heat accumulation oxidation unit (2) is connected with the gas inlet of mixing device (1) and the gas inlet of chimney (3) respectively, and installs third valve (23) at the gas inlet of chimney (3), the high temperature exhanst gas outlet of heat accumulation oxidation unit (2) respectively with the high temperature exhanst gas inlet of mixing device (6) and second flue gas heat transfer device (13) 7) The flue gas inlet of the gas mixing device (6) is connected, a sixth valve (28) and a seventh valve (29) are respectively arranged at a high-temperature flue gas inlet of the gas mixing device (6) and a flue gas inlet of the second flue gas heat exchange device (7), a flue gas outlet of the internal combustion engine set (4) is respectively connected with a low-temperature flue gas inlet of the gas mixing device (6) and a flue gas inlet of the first flue gas heat exchange device (5), a fifth valve (27) and a fourth valve (26) are respectively arranged at a low-temperature flue gas inlet of the gas mixing device (6) and a flue gas inlet of the first flue gas heat exchange device (5), a flue gas outlet of the first flue gas heat exchange device (5) and a flue gas outlet of the second flue gas heat exchange device (7) are simultaneously connected with a flue gas inlet of a chimney (3), a flue gas outlet of the gas mixing device (6) is connected with a flue gas inlet of a flue gas dryer (10), and an oxygen concentration measuring instrument (30) and a temperature measuring instrument (31) are arranged, the discharge gate of breaing up device (8) is connected with the feed inlet of first conveyer (9), the discharge gate of first conveyer (9) is connected with the feed inlet of flue gas drier (10), the exhanst gas outlet of flue gas drier (10) is connected with the flue gas inlet of cyclone (12), the discharge gate of flue gas drier (10) is connected with the feed inlet of second conveyer (11), the play powder mouth of cyclone (12) is connected with the feed inlet of second conveyer (11), the exhanst gas outlet of cyclone (12) is connected with the flue gas inlet of wet dust collector (13), the exhanst gas outlet of wet dust collector (13) is connected with the flue gas inlet of chimney (3).
2. The device for utilizing the residual heat of the flue gas to dry the wet coal mine materials by utilizing the low-concentration gas as claimed in claim 1, wherein the blending device (1) is provided with a flue gas inlet, an air inlet and a gas inlet, a second valve (22) is installed at the flue gas inlet of the blending device (1), and a first valve (21) is installed at the air inlet of the blending device (1).
3. The device for utilizing the residual heat of the flue gas generated by drying the wet materials in the coal mine by utilizing the low-concentration gas as claimed in claim 1, wherein the internal combustion engine set (4) is provided with a gas inlet.
4. The flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas as claimed in claim 1, wherein the first flue gas heat exchange device (5) comprises a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger.
5. The flue gas waste heat utilization device for drying wet materials in coal mines by using low-concentration gas as claimed in claim 1, wherein the second flue gas heat exchange device (7) comprises a waste heat boiler, a flue gas type absorption refrigerator, a flue gas type absorption heat pump or an indirect flue gas heat exchanger.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393259A (en) * | 2020-11-13 | 2021-02-23 | 山东四达工贸股份有限公司 | Drying and waste gas treatment method in phenolic resin coating operation |
| CN112387558A (en) * | 2020-11-13 | 2021-02-23 | 山东四达工贸股份有限公司 | Drying and waste gas treatment system in phenolic resin coating operation |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393259A (en) * | 2020-11-13 | 2021-02-23 | 山东四达工贸股份有限公司 | Drying and waste gas treatment method in phenolic resin coating operation |
| CN112387558A (en) * | 2020-11-13 | 2021-02-23 | 山东四达工贸股份有限公司 | Drying and waste gas treatment system in phenolic resin coating operation |
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