CN103277979B - Deacidification device in cryogenic rectification treatment process of low-concentration oxygen-containing coal bed gas - Google Patents
Deacidification device in cryogenic rectification treatment process of low-concentration oxygen-containing coal bed gas Download PDFInfo
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- CN103277979B CN103277979B CN201310228095.8A CN201310228095A CN103277979B CN 103277979 B CN103277979 B CN 103277979B CN 201310228095 A CN201310228095 A CN 201310228095A CN 103277979 B CN103277979 B CN 103277979B
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- reboiler
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 30
- 239000001301 oxygen Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 title abstract description 12
- 239000003245 coal Substances 0.000 title abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000001179 sorption measurement Methods 0.000 claims abstract description 31
- 230000001172 regenerating effect Effects 0.000 claims abstract description 30
- 230000008929 regeneration Effects 0.000 claims abstract description 28
- 238000011069 regeneration method Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims abstract description 13
- 239000002918 waste heat Substances 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 62
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000007420 reactivation Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010019332 Heat exhaustion Diseases 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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Abstract
The invention discloses a deacidification device in a cryogenic rectification treatment process of low-concentration oxygen-containing coal bed gas, which comprises an MEA (membrane electrode assembly) solution circulating regeneration system, a heat conduction oil circulating system and a refrigerant waste heat recovery system; the MEA solution circulating regeneration system comprises an adsorption tower, a rich solution regeneration system connected with a liquid outlet of the adsorption tower and a lean solution cooling system connected with a liquid inlet of the adsorption tower; the rich liquid regeneration system comprises a regeneration tower for stripping and regenerating the rich liquid and a reboiler for heating and regenerating the rich liquid; the lean solution cooling system comprises a lean solution cooler arranged between a liquid outlet of the reboiler and a liquid inlet of the adsorption tower; a pipeline of the rich liquid regeneration system is provided with a rich liquid pump; the refrigerant waste heat recovery system comprises a high-temperature heat exchanger; the heat conduction oil circulating system comprises a heat conduction oil circulating pipeline arranged between the reboiler and the high-temperature heat exchanger, a heat conduction oil circulating pump is arranged on the heat conduction oil circulating pipeline, and a heat conduction oil air cooler and an electric heater are connected to the heat conduction oil circulating pipeline in parallel.
Description
Technical field
The invention belongs to low concentration coalbed methane containing oxygen cryogenic rectification processing technology field, be specifically related to the deacidifying device in a kind of low concentration coalbed methane containing oxygen cryogenic rectification treatment process.
Background technology
In order to the safe working in colliery, need extraction coal bed gas in the drive carrying out coal mining production.The coal bed gas methane content that this mode extraction obtains is low, usually between 30% ~ 70%.Containing air in this kind of coal bed gas, particularly methane content is less than to the coal bed gas of 50%, air content is higher, deals with dangerous property, so way is for a long time by this low concentration coalbed methane containing oxygen burning or directly discharges, causes energy waste and pollution.
At present, develop various apparatus and method on the market to recycle low concentration coalbed methane containing oxygen, have class methods to be utilize the methane in cryogenic rectification technology recovery coal bed gas, these class methods need coal bed gas to be cooled to less than-140 DEG C, and use aluminium alloy as heat exchange material.But under cryogenic, sour gas knows from experience frozen plug heat exchanger, and has corrosiveness to aluminium alloy, so must carry out depickling to coal bed gas, and then carries out cryogenic rectification process to it.
In current low concentration coalbed methane containing oxygen deacidifying device, main employing solution absorbing and removing sour gas method.Wherein MEA solution (ethanolamine solutions) because can meet under coal bed gas low-voltage operating conditions except acid purification requirement, so be widely used.But the regeneration energy consumption of MEA solution is high, heat exhaustion is large, generally needs to adopt electrical heating, the mode of Steam Heating or combustion heating obtains heat and complete regeneration to MEA solution from the external world, cause a large amount of energy resource consumptions.
On the other hand, refrigeration compressor in cryogenic rectification process is when compressed refrigerant, cold-producing medium can reach the temperature of 150 DEG C ~ 170 DEG C, then with cooling water by refrigerant cools to 40 DEG C, and in traditional low concentration coalbed methane containing oxygen cryogenic rectification treatment process, this part heat is not effectively recycled, and causes a large amount of heat wastes.
Summary of the invention
In view of this, the object of the present invention is to provide the deacidifying device in a kind of low concentration coalbed methane containing oxygen cryogenic rectification treatment process, the heat that compressed refrigerant produces can be used for the regeneration of MEA solution by this deacidifying device, realizes the comprehensive utilization of the energy, reduces energy resource consumption.
For achieving the above object, the invention provides following technical scheme:
A deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process, comprises MEA solution circulation regenerative system, Heat-conduction oil circulation system and cold-producing medium residual neat recovering system;
Described MEA solution circulation regenerative system comprises the lean solution cooling system utilizing the adsorption tower of sour gas in MEA solution removal coalbed methane containing oxygen, the rich solution regenerative system be connected with the liquid outlet of described adsorption tower and be connected with the inlet of described adsorption tower; Described rich solution regenerative system comprises for the regenerator to rich solution steam stripping regeneration with for the reboiler to rich solution thermal regeneration; Described lean solution cooling system comprises the lean solution cooler be arranged between described reboiler liquid outlet and described adsorption tower inlet; The pipeline of described rich solution regenerative system is provided with the rich solution pump for driving MEA solution circulation;
Described cold-producing medium residual neat recovering system comprises the high-temperature heat-exchanging for recycling cold-producing medium waste heat;
Described Heat-conduction oil circulation system comprises the conduction oil circulation line be arranged between described reboiler and described high-temperature heat-exchanging, and described conduction oil circulation line is provided with the heat conduction oil circulating pump for driving conduction oil to circulate, in parallelly on the conduction oil circulation line between the oil-in and the oil-out of high-temperature heat-exchanging of described reboiler be provided with conduction oil air cooler and electric heater.
Further, the liquid outlet of described reboiler is connected with the lean solution inlet of described regenerator, and the lean solution liquid outlet of described regenerator is connected with described lean solution cooler.
Further, described MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger, described adsorption tower liquid outlet is connected with the rich solution inlet of described regenerator after described poor rich liquid heat exchanger, and the lean solution liquid outlet of described regenerator is connected with described lean solution cooler after described poor rich liquid heat exchanger.
Further, described MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger, described adsorption tower liquid outlet is connected with the rich solution inlet of described regenerator after described poor rich liquid heat exchanger, and the liquid outlet of described reboiler is connected with described lean solution cooler after described poor rich liquid heat exchanger.
Further, described rich solution pump is arranged between described adsorption tower liquid outlet and the rich solution inlet of described poor rich liquid heat exchanger.
Further, described heat conduction oil circulating pump is arranged between described reboiler oil-out and the oil-in of described high-temperature heat-exchanging.
Further, the refrigerant outlet pipeline of described high-temperature heat-exchanging is provided with the water cooler for cooling refrigeration agent.
Beneficial effect of the present invention is:
Deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present invention, by arranging the circular regeneration of MEA solution circulation regenerative system for MEA solution, the MEA solution that liquid outlet flows out bottom adsorption tower is called rich solution, under the effect of rich solution regenerative system, rich solution is successively through regenerator steam stripping regeneration and reboiler thermal regeneration, sour gas in rich solution is resolved out, MEA solution has the ability of absorbing acid gases again, become lean solution, after the temperature range that lean solution cooling system is cooled to setting, circulation enters adsorption tower and removes sour gas in coalbed methane containing oxygen again, realize the circular regeneration of MEA solution,
By arranging cold-producing medium residual neat recovering system, high temperature refrigerant, by high-temperature heat-exchanging and conduction oil heat exchange, is entered reboiler by the conduction oil after heating through Heat-conduction oil circulation system, for the thermal regeneration of rich solution provides heat; In addition, by arranging conduction oil air cooler and electric heater, also can control the temperature of conduction oil, when the temperature of conduction oil is too high, open conduction oil air cooler, part conduction oil is cooled, when the temperature of conduction oil is too low, opening electric heater is to heat-conducting oil heating, and final control inputs to the conduction oil temperature in reboiler in the scope of setting, and by arranging electric heater, when refrigeration compressor does not work, electric heater also can work independently to heat-conducting oil heating, and provides reactivation heat for reboiler;
To sum up, by adopting the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present invention, the heat that compressed refrigerant produces can be used for the regeneration of MEA solution, realize the comprehensive utilization of the energy, reduce energy resource consumption.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the structural representation of the deacidifying device embodiment in low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present invention.
Description of reference numerals:
1-adsorption tower; 2-rich solution pump; 3-poor rich liquid heat exchanger; 4-regenerator; 5-reboiler; 6-lean solution cooler; 7-lean pump; 8-heat conduction oil circulating pump; 9-conduction oil air cooler; 10-electric heater; 11-high-temperature heat-exchanging; 12-water cooler.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in Figure 1, be the structural representation of the deacidifying device embodiment in low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present invention.Deacidifying device in the low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present embodiment, comprises MEA solution circulation regenerative system, Heat-conduction oil circulation system and cold-producing medium residual neat recovering system.
MEA solution circulation regenerative system comprises the lean solution cooling system utilizing the adsorption tower 1 of sour gas in MEA solution removal coalbed methane containing oxygen, the rich solution regenerative system be connected with the liquid outlet of adsorption tower 1 and be connected with the inlet of adsorption tower 1, the liquid outlet of adsorption tower 1 is positioned at bottom it, and inlet is positioned at its top.Rich solution regenerative system comprises for the regenerator 4 to rich solution steam stripping regeneration with for the reboiler 5 to rich solution thermal regeneration.Lean solution cooling system comprises the lean solution cooler 6 be arranged between reboiler 5 liquid outlet and adsorption tower 1 inlet.The pipeline of rich solution regenerative system is provided with the rich solution pump 2 for driving MEA solution circulation.
Cold-producing medium residual neat recovering system comprises the high-temperature heat-exchanging 11 for recycling cold-producing medium waste heat.
Heat-conduction oil circulation system comprises the conduction oil circulation line be arranged between reboiler 5 and high-temperature heat-exchanging 11, and conduction oil circulation line is provided with the heat conduction oil circulating pump 8 for driving conduction oil to circulate, in parallelly on the conduction oil circulation line between the oil-in and the oil-out of high-temperature heat-exchanging 11 of reboiler 5 be provided with conduction oil air cooler 9 and electric heater 10, corresponding, with conduction oil air cooler 9 with electric heater 10 is corresponding is provided with valve on conduction oil circulation line, the bypass of conduction oil air cooler 9 and electric heater 10 is also provided with valve.
Deacidifying device in the present embodiment low concentration coalbed methane containing oxygen cryogenic rectification treatment process, by arranging the circular regeneration of MEA solution circulation regenerative system for MEA solution, the MEA solution that liquid outlet flows out bottom adsorption tower 1 is called rich solution, under the effect of rich solution regenerative system, rich solution is successively through regenerator 4 steam stripping regeneration and reboiler 5 thermal regeneration, sour gas in rich solution is resolved out, MEA solution has the ability of absorbing acid gases again, become lean solution, after the temperature range that lean solution cooling system is cooled to setting, circulation enters adsorption tower 1 and removes sour gas in coalbed methane containing oxygen again, realize the circular regeneration of MEA solution.
By arranging cold-producing medium residual neat recovering system, high temperature refrigerant, by high-temperature heat-exchanging 11 and conduction oil heat exchange, is entered reboiler 5 by the conduction oil after heating through Heat-conduction oil circulation system, for the thermal regeneration of rich solution provides heat; In addition, by arranging conduction oil air cooler 9 and electric heater 10, also can control the temperature of conduction oil, when the temperature of conduction oil is too high, open conduction oil air cooler 9, part conduction oil is cooled, when the temperature of conduction oil is too low, opening electric heater 10 pairs of heat-conducting oil heating, and final control inputs to the conduction oil temperature in reboiler 5 in the scope of setting, and by arranging electric heater 10, when refrigeration compressor does not work, electric heater 10 also can work independently to heat-conducting oil heating, and provides reactivation heat for reboiler 5.
To sum up, by adopting the deacidifying device in the low concentration coalbed methane containing oxygen cryogenic rectification treatment process of the present embodiment, the heat that compressed refrigerant produces can be used for the regeneration of MEA solution, realize the comprehensive utilization of the energy, reduce energy resource consumption.
Further, be also provided with lean solution waste heat recycling system in MEA solution circulation regenerative system, lean solution waste heat recycling system can adopt implemented in many forms:
1) liquid outlet of reboiler 5 is connected with the lean solution inlet of regenerator 4, the lean solution liquid outlet of regenerator 4 is connected with lean solution cooler 6, by lean solution being connected with lean solution cooler 6 again after regenerator 4, can partially recycledly utilize the heat of lean solution for regenerator 4 heat supply;
2) MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger 3, adsorption tower 1 liquid outlet is connected with the rich solution inlet of regenerator 4 after poor rich liquid heat exchanger 3, the liquid outlet of reboiler 5 is connected with lean solution cooler 6 after poor rich liquid heat exchanger 3, by arranging poor rich liquid heat exchanger 3, the rich solution in circulation and lean solution can be made to carry out exchange heat, utilize the waste-heat rich solution of lean solution, be convenient to the regeneration of rich solution;
3) MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger 3, adsorption tower 1 liquid outlet is connected with the rich solution inlet of regenerator 4 after poor rich liquid heat exchanger 3, the liquid outlet of reboiler 5 is connected with the lean solution inlet of regenerator 4, the lean solution liquid outlet of regenerator 4 is connected with lean solution cooler 6 after poor rich liquid heat exchanger 3, adopt the MEA solution circulation regenerative system of this structure can in conjunction with the above-mentioned 1st) and the 2nd) advantage of the lean solution waste heat recycling system of two kinds of structures, utilize lean solution waste heat to regenerator 4 and rich solution heating simultaneously, the residual heat integrative usefulness of lean solution is higher.
The MEA solution circulation regenerative system of the present embodiment adopts the 3rd) plant structure, preferably, the rich solution pump 2 of the present embodiment is arranged between the rich solution inlet of adsorption tower 1 liquid outlet and poor rich liquid heat exchanger 3, can drive MEA solution circulation.Heat conduction oil circulating pump 8 is arranged between the oil-in of reboiler 5 oil-out and high-temperature heat-exchanging 11, and conduction oil can be driven to circulate.The refrigerant outlet pipeline of high-temperature heat-exchanging 11 is provided with the water cooler 12 for cooling refrigeration agent, can be used for subsequent handling by after refrigerant cools to design temperature.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (7)
1. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process, is characterized in that: comprise MEA solution circulation regenerative system, Heat-conduction oil circulation system and cold-producing medium residual neat recovering system;
Described MEA solution circulation regenerative system comprises the lean solution cooling system utilizing the adsorption tower of sour gas in MEA solution removal coalbed methane containing oxygen, the rich solution regenerative system be connected with the liquid outlet of described adsorption tower and be connected with the inlet of described adsorption tower; Described rich solution regenerative system comprises for the regenerator to rich solution steam stripping regeneration with for the reboiler to rich solution thermal regeneration; Described lean solution cooling system comprises the lean solution cooler be arranged between described reboiler liquid outlet and described adsorption tower inlet; The pipeline of described rich solution regenerative system is provided with the rich solution pump for driving MEA solution circulation;
Described cold-producing medium residual neat recovering system comprises the high-temperature heat-exchanging for recycling cold-producing medium waste heat;
Described Heat-conduction oil circulation system comprises the conduction oil circulation line be arranged between described reboiler and described high-temperature heat-exchanging, and described conduction oil circulation line is provided with the heat conduction oil circulating pump for driving conduction oil to circulate, in parallelly on the conduction oil circulation line between the oil-in and the oil-out of high-temperature heat-exchanging of described reboiler be provided with conduction oil air cooler and electric heater.
2. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 1, it is characterized in that: the liquid outlet of described reboiler is connected with the lean solution inlet of described regenerator, the lean solution liquid outlet of described regenerator is connected with described lean solution cooler.
3. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 2, it is characterized in that: described MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger, described adsorption tower liquid outlet is connected with the rich solution inlet of described regenerator after described poor rich liquid heat exchanger, and the lean solution liquid outlet of described regenerator is connected with described lean solution cooler after described poor rich liquid heat exchanger.
4. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 1, it is characterized in that: described MEA solution circulation regenerative system also comprises poor rich liquid heat exchanger, described adsorption tower liquid outlet is connected with the rich solution inlet of described regenerator after described poor rich liquid heat exchanger, and the liquid outlet of described reboiler is connected with described lean solution cooler after described poor rich liquid heat exchanger.
5. the deacidifying device in the low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 3 or 4, is characterized in that: described rich solution pump is arranged between described adsorption tower liquid outlet and the rich solution inlet of described poor rich liquid heat exchanger.
6. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 5, is characterized in that: described heat conduction oil circulating pump is arranged between described reboiler oil-out and the oil-in of described high-temperature heat-exchanging.
7. the deacidifying device in low concentration coalbed methane containing oxygen cryogenic rectification treatment process according to claim 1, is characterized in that: the refrigerant outlet pipeline of described high-temperature heat-exchanging is provided with the water cooler for cooling refrigeration agent.
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| CN201310228095.8A CN103277979B (en) | 2013-06-08 | 2013-06-08 | Deacidification device in cryogenic rectification treatment process of low-concentration oxygen-containing coal bed gas |
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2013
- 2013-06-08 CN CN201310228095.8A patent/CN103277979B/en active Active
Patent Citations (6)
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| JPH11228116A (en) * | 1998-02-12 | 1999-08-24 | Nippon Sanso Kk | Recovering and purifying method of argon and device therefor |
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