CN108592071A - A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling - Google Patents
A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling Download PDFInfo
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- CN108592071A CN108592071A CN201810322779.7A CN201810322779A CN108592071A CN 108592071 A CN108592071 A CN 108592071A CN 201810322779 A CN201810322779 A CN 201810322779A CN 108592071 A CN108592071 A CN 108592071A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Drying Of Solid Materials (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling, the system includes the boiler being sequentially communicated, steam turbine, condenser, condensate pump and heat regenerative system, further includes the lignite upgrading system that steam dryer, flue gas drying stove, pyrolysis oven, separator are sequentially communicated；The flue gas flow of pyrolysis oven, flue gas drying stove is adjusted by flue gas drying stokehold regulating valve, reflux branch regulating valve, by constant pressure valve, opposing steam flow branch regulating valve to steam pumping parameter regulation, target is：The temperature of pyrolysis oven maintains optimum temperature, and flue gas drying outlet of still lignite temperature and water content are constant, and drying machine inlet pressure is kept constant；The water supply heated and steam exhaust flow are adjusted by the regulating valve and each steam exhaust regulating valve of water supply branch road, target is：The feedwater flow of suction steam exhaust cooler is as big as possible and is heated to the temperature of deaerator feedwater.The present invention realizes the Poly-generation of electricity and fuel, and system investments are small, capacity usage ratio is high.
Description
Technical field
The present invention relates to lignite predrying, lignite pyrolytic technique fields, and in particular to carries the steam of steam exhaust recovering device
Predrying and low temperature pyrogenation coupled system and operation method.
Background technology
Fossil fuel based on coal occupies leading position in China's energy resource structure, and lignite storage has been verified in wherein China
Amount is more than 130,000,000,000 tons.Lignite is the minimum pit coal of degree of coalification, high volatile, high ash content, high-moisture and low heat value
The characteristics of makes direct combusting brown coal power generation, and there are all multi-environment and efficiencies；Therefore, it is one that the clean and effective of lignite, which utilizes,
The vital technology of item.Lignite pyrolysis Poly-generation is to improve the effective means of its utilization ratio.But current lignite low temperature pyrogenation
Heat source or come from the part semicoke that directly burning generates, or directly burning generation coal gas etc., this process causes greatly
The waste for measuring high-grade heat, does not meet the principle of cascaded utilization of energy；Meanwhile direct extraction section boiler smoke carries out lignite
Predrying, low temperature pyrogenation be faced with extract exhaust gas volumn it is excessive and caused by problems.Realize steam predrying and Low Temperature Thermal
It is decoupling, the tow taste heat and boiler smoke process recycling that further utilize bleeder steam are sought to, realizes energy ladder
Grade utilizes, while improving unit electromotive power output as possible, and problem to be solved includes：
(1) cascade utilization for realizing energy as possible, excavates the utility value of the low-grade pumping of steam turbine, reasonable distribution boiler
The heat of flue gas carries out the low temperature pyrogenation of lignite using flue gas under the premise of not influencing boiler normal operation；
(2) more as possible using the waste heat water supply in predrying and Low Temperature Pyrolysis Process, to improve energy utilization
Efficiency.
Invention content
In order to solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of with steam exhaust recycling
Predrying and pyrolysis coupling system and operation method, the tow taste heat which absorbs bleeder steam first exist
Steam drying stove machine carries out preliminary predrying, and predrying lignite puts into flue gas drying stove and carries out further upgrading, after parameter is up to standard
Be pyrolyzed into pyrolysis oven, this process using the form of boiler smoke recycling to flue gas drying stove and pyrolysis oven heat supply, generation
Semicoke is used for combustion power generation, and tar and coal gas are used as output of products, it is dry be used for the steam exhaust generated in pyrolytic process heating to
Water, to significantly improve unit electrical efficiency；The present invention realizes electricity and the Poly-generation of fuel, and system investments are small, energy utilization
It is efficient.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling, including it is sequentially connected logical boiler
2, steam turbine high-pressure cylinder 4, Steam Turbine Through IP Admission 5, turbine low pressure cylinder 6, condenser 8, condensate pump 9, low pressure heat regenerative system 10,
Oxygen-eliminating device 11, water pump 12 and mesohigh heat regenerative system 13, the air preheater 3 and and steam turbine being arranged on 2 back-end ductwork of boiler
The generator system 7 that low pressure (LP) cylinder 6 connects；Further include steam dryer 101, flue gas drying stove 104, low temperature pyrogenation stove 105 and point
From the lignite upgrading system that device 106 is sequentially connected logical composition, separator 106 is connected with 2 burner hearth of boiler；Separator 106 passes through
Semicoke regulating valve 122 is connected to external environment；Steam dryer 101 passes through constant pressure with 6 exhaust pipe of the turbine low pressure cylinder
Valve 111 is connected, and is connected with oxygen-eliminating device 11；Condensation is installed on the pipeline that oxygen-eliminating device 11 is connect with steam dryer 101
Water return valve 110；2 flue of the boiler by wind turbine 107 successively with 104 phase of low temperature pyrogenation stove 105 and flue gas drying stove
Connection, flue gas drying stove 104 are connected to by 109 pipeline of wind turbine with 3 front position of air preheater on 2 back-end ductwork of boiler；Low Temperature Thermal
The outlet of solution stove 105 is directly connected with boiler flue by wind turbine 108；Before flue gas drying stove 104,108 place branch road of wind turbine
Dry regulating valve 103 and return valve 102 are installed；8 outlet conduit of condenser by feed pump 9, feed-regulating valve 118 according to
It is secondary to be connected with low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler 121 and oxygen-eliminating device 11；
101 exhaust steam pipeline of steam dryer, 104 exhaust steam pipeline of flue gas drying stove and 105 exhaust steam pipeline of low temperature pyrogenation stove are respectively by low
Warm steam exhaust regulating valve 113, medium temperature steam exhaust regulating valve 115 and high temperature steam exhaust regulating valve 117 and low-temperature steam exhaust cooler 119, medium temperature
Steam exhaust cooler 120 is connected with high temperature steam exhaust cooler 121, to further increase the complex energy utilization ratio of system；
101 exhaust steam pipeline of steam dryer, 104 exhaust steam pipeline of flue gas drying stove and 105 exhaust steam pipeline of low temperature pyrogenation stove are arranged by low temperature
Air valve 112, medium temperature air bleeding valve 114 and high-temperature exhaust air valve 116 are connected to external environment.
Steam dryer 101 does heat source, steam and lignite dividing wall type using the pumping of a 6 level V part of turbine low pressure cylinder
Heat exchange, realizes the primary predrying of lignite.
Low temperature pyrogenation stove 105 does heat source, flue gas and lignite wall-type heat exchange using a part of high-temperature flue gas in boiler 2, real
The low temperature pyrogenation of existing lignite；A 105 exiting flue gas part of low temperature pyrogenation stove enters flue gas drying stove 104, flue gas and lignite partition
Formula exchanges heat, and realizes that the further predrying of lignite, exiting flue gas are ultimately discharged into flue before air preheater 3；Low temperature pyrogenation stove 105 goes out
Mouth remainder flue gas is directly back to boiler flue.
Former lignite through steam dryer 101, the upgrading twice of flue gas drying stove 104 to specified parameter, in low temperature pyrogenation stove 105
Middle to be pyrolyzed, thermal decomposition product is detached in separator 106, and semicoke puts into boiler 2 and final output electric energy, coal gas and coke
Oil is exported as product fuel；The steam exhaust generated in dry and pyrolytic process from low to high, is passed through low-temperature steam exhaust successively by temperature
The 121 heating part water supply of cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler, it is final to realize electricity and fuel
Poly-generation technology.
A kind of predrying with steam exhaust recycling and pyrolysis coupling system and the operation method of operation method, pass through
Adjust the matching that constant pressure valve 111 realizes the constant and flow of steam pumping pressure with condensate return regulating valve 110；It is dry by adjusting
Dry regulating valve 103 realizes the matching of low temperature pyrogenation stove 105 and flue gas flow in flue gas drying stove 104 with return valve 102, from
And keep the constant of lignite upgrading parameter and thermal decomposition product parameter；Pass through the feed-regulating valve before water supply branch road steam exhaust cooler
118, the feedwater flow of low-temperature steam exhaust regulating valve 113, medium temperature steam exhaust regulating valve 115 and high temperature steam exhaust regulating valve 117 to being heated
And it is passed through the steam exhaust flow progress of low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler 121
It adjusts, adjusting target is：It is pumped into low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler 121
Feedwater flow is as big as possible, and is heated to the temperature of 11 water supply of oxygen-eliminating device；By adjusting cryopumping valve 112, medium temperature exhaust
Valve 114 realizes the flexibility of water supply heating and system operation with high-temperature exhaust air valve 116.
Compared to the prior art, the present invention has the following advantages：
(1) predrying by the recycling of part boiler smoke for lignite and low temperature pyrogenation realize the step profit of energy
With compared with direct combusting brown coal, significantly improving energy utilization efficiency.
(2) due to increasing steam predry drying system, the low-grade energy of steam turbine low-pressure pumping is further utilized, together
Shi great great reduces the thermic load of flue gas drying stove so that the amount of smoking gas substantially reduces, and ensure that the normal operation of boiler.
(3) the two-stage predrying of lignite and low temperature pyrogenation system so that steam predrying and flue gas predrying load are flexible
Distribution.
(4) dry steam exhaust carries out internal recovering by grade height, heats water supply, considerably improves the electrical efficiency of unit.
Description of the drawings
Fig. 1 is the present invention a kind of predrying and pyrolysis coupling system and operation method figure with steam exhaust recycling.
Specific implementation mode
The present invention is described in further details with reference to the accompanying drawings and detailed description.
As shown in Figure 1, the present invention a kind of predrying and pyrolysis coupling system with steam exhaust recycling, including be sequentially connected logical
Boiler 2, steam turbine high-pressure cylinder 4, Steam Turbine Through IP Admission 5,6 condenser 8 of turbine low pressure cylinder, condensate pump 9, low pressure backheat system
System 10, oxygen-eliminating device 11, water pump 12 and mesohigh heat regenerative system 13, the air preheater 3 and and vapour being arranged on 2 back-end ductwork of boiler
The generator system 7 that turbine low pressure (LP) cylinder 6 connects, further includes steam dryer 101, flue gas drying stove 104, low temperature pyrogenation stove 105
The lignite upgrading system of logical composition is sequentially connected with separator 106, separator 106 is connected with 2 burner hearth of boiler；Separator 106
It is connected to external environment by semicoke regulating valve 122；Steam dryer 101 passes through with 6 exhaust pipe of the turbine low pressure cylinder
Constant pressure valve 111 is connected, and is connected with oxygen-eliminating device 11；It is equipped on the pipeline that oxygen-eliminating device 11 is connect with steam dryer 101
Condensate return regulating valve 110；2 flue of the boiler by wind turbine 107 successively with low temperature pyrogenation stove 105 and flue gas drying stove
104 are connected, and flue gas drying stove 104 is connected to by 109 pipeline of wind turbine with 3 front position of air preheater on 2 back-end ductwork of boiler；It is low
The outlet of warm pyrolysis oven 105 is directly connected with boiler flue by wind turbine 108；It is propped up before flue gas drying stove 104, where wind turbine 108
Road is equipped with dry regulating valve 103 and return valve 102；8 outlet conduit of condenser passes through feed pump 9, feed-regulating valve
118 successively with 11 phase of low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler 121 and oxygen-eliminating device
Connection；101 exhaust steam pipeline of steam dryer, 104 exhaust steam pipeline of flue gas drying stove and 105 exhaust steam pipeline of low temperature pyrogenation stove are led to respectively
Cross low-temperature steam exhaust regulating valve 113, medium temperature steam exhaust regulating valve 115 and high temperature steam exhaust regulating valve 117 and low-temperature steam exhaust cooler 119,
Medium temperature steam exhaust cooler 120 is connected with high temperature steam exhaust cooler 121, and the complex energy to further increase system utilizes effect
Rate；101 exhaust steam pipeline of steam dryer, 104 exhaust steam pipeline of flue gas drying stove and 105 exhaust steam pipeline of low temperature pyrogenation stove pass through low temperature
Air bleeding valve 112, medium temperature air bleeding valve 114 and high-temperature exhaust air valve 116 are connected to external environment.
As the preferred embodiment of the present invention, steam dryer 101 is taken out using a 6 level V part of turbine low pressure cylinder
Gas does heat source, steam and lignite wall-type heat exchange, realizes the primary predrying of lignite.
As the preferred embodiment of the present invention, low temperature pyrogenation stove 105 does heat using a part of high-temperature flue gas in boiler 2
Source, flue gas and lignite wall-type heat exchange, realize the low temperature pyrogenation of lignite；A 105 exiting flue gas part of low temperature pyrogenation stove enters cigarette
Gas drying oven 104, flue gas and lignite wall-type heat exchange realize that the further predrying of lignite, exiting flue gas are ultimately discharged into empty pre-
Flue before device 3；Low temperature pyrogenation stove 105 exports remainder flue gas and is directly back to boiler flue.
As the preferred embodiment of the present invention, former lignite is reasonable twice through steam dryer 101, flue gas drying stove 104
Matchingly upgrading is pyrolyzed to specified parameter in low temperature pyrogenation stove 105, and thermal decomposition product is detached in separator 106,
Semicoke puts into boiler 2 and final output electric energy, and coal gas is exported with tar as product fuel；It is generated in dry and pyrolytic process
Steam exhaust from low to high, is passed through low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooling successively by temperature
121 heating part water supply of device, the final Poly-generation technology for realizing electricity and fuel.Lignite predrying degree steam dryer 101,
The condensate return regulating valve 110 that fits through in flue gas drying stove 104 is regulated and controled with dry regulating valve 103.
As shown in Figure 1, a kind of predrying with steam exhaust recycling of the present invention and pyrolysis coupling system and the fortune of operation method
Row method：By for adjusting constant pressure valve 111 and the constant and flow of the realization steam pumping pressure of condensate return regulating valve 110
Match；By the dry regulating valve 103 of adjusting low temperature pyrogenation stove 105 and flue gas in flue gas drying stove 104 are realized with return valve 102
The matching of flow, to keep the constant of lignite upgrading parameter and thermal decomposition product parameter；Pass through water supply branch road steam exhaust cooler
Preceding feed-regulating valve 118, low-temperature steam exhaust regulating valve 113, medium temperature steam exhaust regulating valve 115 and high temperature steam exhaust regulating valve 117 is to quilt
The feedwater flow of heating and it is passed through low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature steam exhaust cooler 121
Steam exhaust flow be adjusted, adjust target be：It is weary to be pumped into low-temperature steam exhaust cooler 119, medium temperature steam exhaust cooler 120 and high temperature
The feedwater flow of vapour cooler 121 is as big as possible, and is heated to the temperature of 11 water supply of oxygen-eliminating device；By adjusting cryopumping valve
112, medium temperature air bleeding valve 114 realizes the flexibility of water supply heating and system operation with high-temperature exhaust air valve (116).
Claims (5)
1. a kind of predrying and pyrolysis coupling system with steam exhaust recycling, including it is sequentially connected logical boiler (2), steam turbine height
Cylinder pressure (4), Steam Turbine Through IP Admission (5), turbine low pressure cylinder (6), condenser (8), condensate pump (9), low pressure heat regenerative system
(10), oxygen-eliminating device (11), water pump (12) and mesohigh heat regenerative system (13), the air preheater being arranged on boiler (2) back-end ductwork
(3) and with turbine low pressure cylinder (6) generator system (7) connecting；It is characterized in that：Further include steam dryer (101),
Flue gas drying stove (104), low temperature pyrogenation stove (105) and separator (106) are sequentially connected the lignite upgrading system of logical composition, separation
Device (106) is connected with boiler (2) burner hearth；Separator (106) is connected to by semicoke regulating valve (122) with external environment；Steam
Drying machine (101) is connected with the turbine low pressure cylinder (6) exhaust pipe by constant pressure valve (111), and with oxygen-eliminating device (11)
It is connected；Condensate return regulating valve (110) is installed on the pipeline that oxygen-eliminating device (11) is connect with steam dryer (101)；Institute
It states boiler (2) flue by wind turbine (107) to be successively connected with low temperature pyrogenation stove (105) and flue gas drying stove (104), flue gas is dry
Dry stove (104) is connected to by wind turbine (109) pipeline with air preheater (3) front position on boiler (2) back-end ductwork；Low temperature pyrogenation stove
(105) outlet is directly connected with boiler flue by wind turbine (108)；It is propped up before flue gas drying stove (104), where wind turbine (108)
Road is equipped with dry regulating valve (103) and return valve (102)；Condenser (8) outlet conduit by feed pump (9), give
Water regulating valve (118) successively with low-temperature steam exhaust cooler (119), medium temperature steam exhaust cooler (120) and high temperature steam exhaust cooler
(121) and oxygen-eliminating device (11) is connected；Steam dryer (101) exhaust steam pipeline, flue gas drying stove (104) exhaust steam pipeline with it is low
Warm pyrolysis oven (105) exhaust steam pipeline is weary by low-temperature steam exhaust regulating valve (113), medium temperature steam exhaust regulating valve (115) and high temperature respectively
Steam control valve (117) and low-temperature steam exhaust cooler (119), medium temperature steam exhaust cooler (120) and high temperature steam exhaust cooler (121) phase
Connection, to further increase the complex energy utilization ratio of system；Steam dryer (101) exhaust steam pipeline, flue gas drying stove
(104) exhaust steam pipeline passes through cryopumping valve (112), medium temperature air bleeding valve (114) and height with low temperature pyrogenation stove (105) exhaust steam pipeline
Warm air bleeding valve (116) is connected to external environment.
2. a kind of predrying and pyrolysis coupling system with steam exhaust recycling according to claim 1, it is characterised in that：It steams
Vapour drying machine (101) does heat source, steam and lignite wall-type heat exchange using the pumping of turbine low pressure cylinder (6) level V part,
Realize the primary predrying of lignite.
3. a kind of predrying and pyrolysis coupling system with steam exhaust recycling according to claim 1, it is characterised in that：It is low
Warm pyrolysis oven (105) uses a part of high-temperature flue gas in boiler (2) to do heat source, flue gas and lignite wall-type heat exchange, realizes lignite
Low temperature pyrogenation；Low temperature pyrogenation stove (105) exiting flue gas part enters flue gas drying stove (104), flue gas and lignite dividing wall type
Heat exchange realizes that the further predrying of lignite, exiting flue gas are ultimately discharged into flue before air preheater (3)；Low temperature pyrogenation stove (105)
Outlet remainder flue gas is directly back to boiler flue.
4. a kind of predrying and pyrolysis coupling system with steam exhaust recycling according to claim 1, it is characterised in that：It is former
Lignite is through steam dryer (101), flue gas drying stove (104) upgrading twice to specified parameter, the hair in low temperature pyrogenation stove (105)
Heat solution, thermal decomposition product are detached in separator (106), and semicoke puts into boiler (2) and final output electric energy, coal gas and coke
Oil is exported as product fuel；The steam exhaust generated in dry and pyrolytic process from low to high, is passed through low-temperature steam exhaust successively by temperature
Cooler (119), medium temperature steam exhaust cooler (120) and high temperature steam exhaust cooler (121) heating part water supply, it is final realize electricity with
The Poly-generation technology of fuel.
5. a kind of operation side of predrying and pyrolysis coupling system with steam exhaust recycling of Claims 1-4 any one of them
Method, it is characterised in that：By adjusting constant pressure valve (111) the constant of steam pumping pressure is realized with condensate return regulating valve (110)
With the matching of flow；By the dry regulating valve (103) of adjusting low temperature pyrogenation stove (105) and cigarette are realized with return valve (102)
The matching of flue gas flow in gas drying oven (104), to keep the constant of lignite upgrading parameter and thermal decomposition product parameter；By giving
Feed-regulating valve (118), low-temperature steam exhaust regulating valve (113) before water branch road steam exhaust cooler, medium temperature steam exhaust regulating valve (115)
With high temperature steam exhaust regulating valve (117) is to the feedwater flow that is heated and to be passed through low-temperature steam exhaust cooler (119), medium temperature steam exhaust cold
But the steam exhaust flow of device (120) and high temperature steam exhaust cooler (121) is adjusted, and adjusts target and is：It is pumped into low-temperature steam exhaust cooling
The feedwater flow of device (119), medium temperature steam exhaust cooler (120) and high temperature steam exhaust cooler (121) is as big as possible, and is heated to
The temperature of oxygen-eliminating device (11) water supply；By adjusting cryopumping valve (112), medium temperature air bleeding valve (114) and high-temperature exhaust air valve (116)
Realize the flexibility of water supply heating and system operation.
Priority Applications (1)
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| CN201810322779.7A CN108592071B (en) | 2018-04-11 | 2018-04-11 | A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling |
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| CN201810322779.7A CN108592071B (en) | 2018-04-11 | 2018-04-11 | A kind of predrying and pyrolysis coupling system and operation method with steam exhaust recycling |
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| CN108592071B CN108592071B (en) | 2019-08-13 |
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