CN108559542A - Steam predrying and low temperature pyrogenation coupled system and operation method - Google Patents
Steam predrying and low temperature pyrogenation coupled system and operation method Download PDFInfo
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- CN108559542A CN108559542A CN201810322200.7A CN201810322200A CN108559542A CN 108559542 A CN108559542 A CN 108559542A CN 201810322200 A CN201810322200 A CN 201810322200A CN 108559542 A CN108559542 A CN 108559542A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/14—Features of low-temperature carbonising processes
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Steam predrying and low temperature pyrogenation coupled system and operation method, the system includes being sequentially connected logical boiler, steam turbine high-pressure cylinder, steam turbine mesolow cylinder, condenser, condensate pump and heat regenerative system, further includes that steam dryer, flue gas drying stove, low temperature pyrogenation stove, separator are sequentially connected and logical constitute lignite upgrading system；The high-temperature flue gas flow for being pumped into pyrolysis oven, flue gas drying stove is adjusted by the regulating valve of flue gas drying stokehold, the regulating valve of smoke backflow branch, steam pumping flow and pressure is adjusted in the regulating valve of the constant pressure valve, opposing steam flow oxygen-eliminating device branch that are evacuated by turbine low pressure cylinder level V, and the target of adjusting is：The temperature of pyrolysis oven maintains best pyrolysis temperature, and flue gas drying outlet of still lignite temperature and water content are constant, and steam dryer inlet steam pressure is kept constant；The present invention realizes heat, the Poly-generation of electricity, fuel, and system investments are small, energy utilization efficiency is high.
Description
Technical field
The present invention relates to lignite predrying, lignite pyrolytic technique fields, and in particular to steam predrying is decoupled with Low Temperature Thermal
Collaboration is united 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 external heat supply of waste heat 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 steam predrying and Low Temperature Thermals
Decoupling system and operation method, the system Central Plains lignite absorb the tow taste heat of bleeder steam in steam drying stove first
Machine carries out preliminary predrying, and predrying lignite puts into flue gas drying stove and carries out further upgrading, enters pyrolysis oven after parameter is up to standard
Pyrolysis, this process is using the form of boiler smoke recycling to flue gas drying stove and pyrolysis oven heat supply, and the semicoke of generation is for firing
Power generation is burnt, for tar with coal gas as output of products, the steam exhaust generated in drying and pyrolytic process is used for heat supply；The present invention realizes
The Poly-generation of heat, electricity, fuel, system investments are small, energy utilization efficiency is high.
In order to achieve the above object, the present invention adopts the following technical scheme that：
Steam predrying and low temperature pyrogenation coupled system, including it is sequentially connected logical boiler 2, steam turbine high-pressure cylinder 4, steamer
Machine intermediate pressure cylinder 5,6 condenser 8 of turbine low pressure cylinder, condensate pump 9, low pressure heat regenerative system 10, oxygen-eliminating device 11, water pump 12 and middle height
Hot systems 13 are pushed back, the generator system that the air preheater 3 on 2 back-end ductwork of boiler is set and is connect with turbine low pressure cylinder 6
System 7；Further include dividing wall type steam dryer 101, dividing wall type flue gas drying stove 104, low temperature pyrogenation stove 105 and separator 106 according to
The lignite upgrading system of the secondary composition that is connected, separator 106 are connected with 2 burner hearth of boiler；Separator 106 passes through semicoke regulating valve
118 are connected with external environment；Steam dryer 101 is connected with 6 exhaust pipe of the turbine low pressure cylinder by constant pressure valve 111
It is logical, and be connected with oxygen-eliminating device 11；Condensate return adjusting is installed on the pipeline that oxygen-eliminating device 11 is connect with steam dryer 101
Valve 110；2 flue of the boiler is connected with low temperature pyrogenation stove 105 and flue gas drying stove 104 successively by wind turbine 107, and flue gas is dry
Dry 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；Low temperature pyrogenation stove 105 exports
Directly it is connected with boiler flue by wind turbine 108；Before flue gas drying stove 104,108 place branch road of wind turbine dry tune is installed
Save valve 103 and return valve 102；101 exhaust steam pipeline of steam dryer, 104 exhaust steam pipeline of flue gas drying stove and low temperature pyrogenation
105 exhaust steam pipeline of stove is connected by low temperature regulating valve 113, medium temperature regulating valve 115 and high temperature adjustable valve 117 with external heat supply network respectively
It is logical, to further increase the complex energy utilization ratio of system；Pass through cryopumping valve 112, medium temperature air bleeding valve 114 and high temperature
Air bleeding valve 116 is connected to external environment.
The steam dryer 101 does heat source using the pumping of a 6 level V part of turbine low pressure cylinder, between steam and lignite
Wall type exchanges heat, and realizes the primary predrying of lignite.
The low temperature pyrogenation stove 105 does heat source using a part of high-temperature flue gas in boiler 2, and flue gas is changed with lignite dividing wall type
Heat realizes the low temperature pyrogenation of lignite；A 105 exiting flue gas part of low temperature pyrogenation stove enters flue gas drying stove 104, flue gas and lignite
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 gases are directly back to boiler flue.
The original lignite through steam dryer 101, flue gas drying stove 104 twice Proper Match upgrading to specified parameter,
It is pyrolyzed in low temperature pyrogenation stove 105, thermal decomposition product is detached in separator 106, and it is simultaneously final defeated that semicoke puts into boiler 2
Go out electric energy, coal gas is exported with tar as product fuel；It is dry to be used for heat by temperature height with the steam exhaust generated in pyrolytic process
Net heat supply, it is final to realize heat, the Poly-generation technology of electricity, fuel.
The operation method of the steam predrying and low temperature pyrogenation coupled system：By adjusting constant pressure valve 111 and condensed water
Return valve 110 realizes the matching of the constant and flow of steam pumping pressure；It is adjusted with reflux by the dry regulating valve 103 of adjusting
Valve 102 realizes the matching of low temperature pyrogenation stove 105 and flue gas flow in flue gas drying stove 104, to keep lignite upgrading parameter with
Thermal decomposition product parameter it is constant；Heat supply network is realized by adjusting low temperature regulating valve 113, medium temperature regulating valve 115 and high temperature adjustable valve 117
The matching of heat supply；It realizes heat supply network heat supply by adjusting cryopumping valve 112, medium temperature air bleeding valve 114 and high-temperature exhaust air valve 116 and is
The flexibility of system operation.
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 realizes lignite heat, electric, fuel co-production technology, significantly improves the comprehensive utilization ratio of lignite.
Description of the drawings
Fig. 1 is steam predrying of the present invention and low temperature pyrogenation coupled system figure.
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, steam predrying of the present invention and low temperature pyrogenation coupled system, including it is sequentially connected logical boiler 2, vapour
Turbine high pressure cylinder 4, Steam Turbine Through IP Admission 5,6 condenser 8 of turbine low pressure cylinder, condensate pump 9, low pressure heat regenerative system 10, deoxygenation
Device 11, water pump 12 and mesohigh heat regenerative system 13, the air preheater 3 and and steam turbine low-pressure being arranged on 2 back-end ductwork of boiler
Cylinder 6 connect generator system 7, further include：Further include dividing wall type steam dryer 101, dividing wall type flue gas drying stove 104, low
Warm pyrolysis oven 105 and separator 106 are sequentially connected the lignite upgrading system of logical composition, and separator 106 is connected with 2 burner hearth of boiler
It is logical；Separator 106 is connected by semicoke regulating valve 118 with external environment；Steam dryer 101 and the turbine low pressure cylinder
6 exhaust pipes are connected by constant pressure valve 111, and are connected with oxygen-eliminating device 11；Oxygen-eliminating device 11 is connect with steam dryer 101
Condensate return regulating valve 110 is installed on pipeline；2 flue of the boiler by wind turbine 107 successively with low temperature pyrogenation stove 105 and
Flue gas drying stove 104 is connected, before flue gas drying stove 104 is by the air preheater 3 on 109 pipeline of wind turbine and 2 back-end ductwork of boiler
Position is connected to；The outlet of low temperature pyrogenation stove 105 is directly connected with boiler flue by wind turbine 108；Before flue gas drying stove 104, wind
108 place branch road of machine is equipped with dry regulating valve 103 and return valve 102；101 exhaust steam pipeline of steam dryer, flue gas
104 exhaust steam pipeline of drying oven and 105 exhaust steam pipeline of low temperature pyrogenation stove, pass through low temperature regulating valve 113, medium temperature regulating valve 115 respectively
It is connected with high temperature adjustable valve 117 with external heat supply network, to further increase the complex energy utilization ratio of system；Pass through low temperature
Air bleeding valve 112, medium temperature air bleeding valve 114 are connected to high-temperature exhaust air valve 116 with 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 is used for heat supply network heat supply by temperature height, final to realize heat, the Poly-generation technology of electricity, fuel.Lignite predrying degree is being steamed
The condensate return regulating valve 110 that fits through in vapour drying machine 101, flue gas drying stove 104 is adjusted with dry regulating valve 103
Control.
As shown in Figure 1, the operation method of steam predrying and low temperature pyrogenation coupled system of the present invention：By adjusting constant pressure valve
111 realize the matching of the constant and flow of steam pumping pressure with condensate return regulating valve 110；Pass through the dry regulating valve of adjusting
103 realize the matching of low temperature pyrogenation stove 105 and flue gas flow in flue gas drying stove 104 with return valve 102, to keep brown
Coal upgrading parameter is constant with thermal decomposition product parameter；It is adjusted by adjusting low temperature regulating valve 113, medium temperature regulating valve 115 and high temperature
Valve 117 realizes the matching of heat supply network heat supply；It is real by adjusting cryopumping valve 112, medium temperature air bleeding valve 114 and high-temperature exhaust air valve 116
The flexibility of existing heat supply network heat supply and system operation.
Claims (5)
1. steam predrying and low temperature pyrogenation coupled system, including it is sequentially connected logical boiler (2), steam turbine high-pressure cylinder (4), vapour
Turbine intermediate pressure cylinder (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 vapour being arranged on boiler (2) back-end ductwork
The generator system (7) of turbine low pressure (LP) cylinder (6) connection；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, separator (106) with
Boiler (2) burner hearth is connected；Separator (106) is connected by semicoke regulating valve (118) with external environment；Steam dryer
(101) it is connected by constant pressure valve (111) with the turbine low pressure cylinder (6) exhaust pipe, and is connected with oxygen-eliminating device (11)；
Condensate return regulating valve (110) is installed on the pipeline that oxygen-eliminating device (11) is connect with steam dryer (101)；The boiler
(2) flue is connected with low temperature pyrogenation stove (105) and flue gas drying stove (104) successively by wind turbine (107), flue gas drying stove
(104) it is connected to air preheater (3) front position on boiler (2) back-end ductwork by wind turbine (109) pipeline；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)；Steam dryer (101) exhaust steam pipeline, flue gas drying stove
(104) exhaust steam pipeline passes through low temperature regulating valve (113), medium temperature regulating valve (115) respectively with low temperature pyrogenation stove (105) exhaust steam pipeline
It is connected with high temperature adjustable valve (117) with external heat supply network, to further increase the complex energy utilization ratio of system；By low
Warm air bleeding valve (112), medium temperature air bleeding valve (114) are connected to high-temperature exhaust air valve (116) with external environment.
2. steam predrying according to claim 1 and low temperature pyrogenation coupled system, it is characterised in that：Steam dryer
(101) it uses the pumping of turbine low pressure cylinder (6) level V part to do heat source, steam and lignite wall-type heat exchange, realizes lignite
Primary predrying.
3. steam predrying according to claim 1 and low temperature pyrogenation coupled system, it is characterised in that：Low temperature pyrogenation stove
(105) it uses a part of high-temperature flue gas in boiler (2) to do heat source, flue gas and lignite wall-type heat exchange, realizes the Low Temperature Thermal of lignite
Solution；Low temperature pyrogenation stove (105) exiting flue gas part enters flue gas drying stove (104), flue gas and lignite wall-type heat exchange, realizes
The further predrying of lignite, exiting flue gas are ultimately discharged into flue before air preheater (3)；Low temperature pyrogenation stove (105) outlet is remaining
Partial fume is directly back to boiler flue.
4. steam predrying according to claim 1 and low temperature pyrogenation coupled system, it is characterised in that：Former lignite is through steam
Drying machine (101), flue gas drying stove (104) upgrading twice to specified parameter are pyrolyzed in low temperature pyrogenation stove (105), heat
Solution product is detached in separator (106), and semicoke puts into boiler (2) and final output electric energy, and coal gas is with tar as production
Product fuel exports；It is dry to be used for heat supply network heat supply by temperature height with the steam exhaust generated in pyrolytic process, it is final to realize heat, electricity, combustion
The Poly-generation technology of material.
5. the operation method of the Claims 1-4 predrying of any one of them steam and low temperature pyrogenation coupled system, feature exist
In：By for adjusting constant pressure valve (111) and the constant and flow of condensate return regulating valve (110) realization steam pumping pressure
Match；By the dry regulating valve (103) of adjusting low temperature pyrogenation stove (105) and flue gas drying stove are realized with return valve (102)
(104) matching of flue gas flow in, to keep the constant of lignite upgrading parameter and thermal decomposition product parameter；By adjusting low temperature tune
Save the matching that valve (113), medium temperature regulating valve (115) and high temperature adjustable valve (117) realize heat supply network heat supply；By adjusting cryopumping
Valve (112), medium temperature air bleeding valve (114) realize the flexibility of heat supply network heat supply and system operation with high-temperature exhaust air valve (116).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322200.7A CN108559542B (en) | 2018-04-11 | 2018-04-11 | Steam pre-drying and low-temperature pyrolysis coupling system and operation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322200.7A CN108559542B (en) | 2018-04-11 | 2018-04-11 | Steam pre-drying and low-temperature pyrolysis coupling system and operation method |
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| Publication Number | Publication Date |
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| CN108559542A true CN108559542A (en) | 2018-09-21 |
| CN108559542B CN108559542B (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262618A (en) * | 2021-12-24 | 2022-04-01 | 西安交通大学 | Pyrogenic upgrading device and method for high-chlorine coal |
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| CN114262618B (en) * | 2021-12-24 | 2022-08-26 | 西安交通大学 | Pyrogenic upgrading device and method for high-chlorine coal |
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| Publication number | Publication date |
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| CN108559542B (en) | 2020-07-28 |
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