CN113188149A - System and method for improving inlet air temperature and fuel heat value of garbage power station by groove type solar energy - Google Patents
System and method for improving inlet air temperature and fuel heat value of garbage power station by groove type solar energy Download PDFInfo
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- CN113188149A CN113188149A CN202110469339.6A CN202110469339A CN113188149A CN 113188149 A CN113188149 A CN 113188149A CN 202110469339 A CN202110469339 A CN 202110469339A CN 113188149 A CN113188149 A CN 113188149A
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- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 195
- 239000000446 fuel Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005338 heat storage Methods 0.000 claims abstract description 11
- 238000000855 fermentation Methods 0.000 claims abstract description 9
- 230000004151 fermentation Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims description 129
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 230000007613 environmental effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 238000005286 illumination Methods 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 description 5
- 230000008676 import Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M1/00—Apparatus for enzymology or microbiology
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/30—Arrangements for concentrating solar-rays for solar heat collectors with lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
A groove type solar system and a method for improving inlet air temperature and fuel heat value of a garbage power station are characterized in that a groove type solar heat collection, heat storage and heat exchange system module is additionally arranged on the garbage power station, a garbage pool and a primary air system and a secondary air system of the existing garbage power station are improved, the garbage pool is designed into a closed system, a garbage inlet primary door and a garbage inlet secondary door of the garbage pool are arranged, the primary door and the garbage inlet secondary door are arranged at a feed hopper at an inlet of a hearth, an air inlet and the like are arranged at the bottom of the garbage pool, and therefore the purpose of heating the primary air and the secondary air of the garbage power station by utilizing solar energy is achieved. In addition, the temperature of the garbage pool can be increased by sending heated air into the garbage pool. The invention can obviously reduce or eliminate the consumption of main steam and one-section extraction steam for heating the air preheater, obviously improve the generating power and efficiency of the unit, promote the fermentation process of the garbage in the garbage pool by accurately controlling the temperature of the garbage in the garbage pool, effectively improve the heat value of fuel garbage and further improve the heat efficiency of the waste heat boiler.
Description
Technical Field
The invention relates to the technical field of garbage power generation, in particular to a system and a method for improving the inlet air temperature and the fuel heat value of a garbage power station by groove type solar energy.
Background
At present, the harmless treatment method of the household garbage mainly comprises 3 methods, namely sanitary landfill, biological treatment and incineration treatment. The waste incineration waste heat power generation treatment method is the most ideal treatment mode at present, and has the characteristics of small project occupation, high treatment speed, good reduction effect, good pollution control, high energy utilization and the like.
Among the garbage power station thermodynamic system that has put into production now, exhaust-heat boiler air heater all relies on main steam and one section steam extraction to heat exhaust-heat boiler inlet air temperature, is showing like this and has reduced garbage power station's generating capacity and generating efficiency, and take a garbage power station of 25MW grade as an example, exhaust-heat boiler air heater's steam consumption is about 12t/h, and this leads to unit generated power to reduce about 2.0MW, reduces about 8% relatively.
In addition, the waste incineration power plant discovers in operation that the waste in the waste pool is frozen due to low environmental temperature in winter, which causes insufficient fermentation of the waste in the waste pool, thereby reducing the heat value of the waste entering the waste heat boiler. The stable combustion of the boiler can be directly influenced by the reduction of the temperature and the heat value of the garbage, diesel oil combustion-supporting garbage needs to be frequently input, and the production cost is indirectly improved, the generated energy is reduced, and the garbage disposal capability is reduced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a system and a method for improving the inlet air temperature and the fuel heat value of a garbage power station by using trough solar energy.
In order to achieve the purpose, the invention adopts the technical scheme that:
a system for improving the inlet air temperature and the fuel heat value of a garbage power station by groove type solar energy comprises a garbage pool of the garbage power station, a primary air system and a secondary air system, wherein groove type solar heat collection, heat storage and heat exchange systems are arranged on the garbage pool, the primary air system and the secondary air system;
the groove type solar heat collection, heat storage and heat exchange system comprises a groove type solar heat collection environmental field 1, a heat conduction oil heat absorption pipe 25 is arranged in the groove type solar heat collection environmental field 1, an outlet main pipe of the heat conduction oil heat absorption pipe 25 is connected with a high-temperature heat conduction oil inlet of an oil/molten salt heat exchanger 2, a low-temperature heat conduction oil outlet of the oil/molten salt heat exchanger 2 is connected with a heat conduction oil inlet of a gas-liquid separator 3 through a pipeline, an outlet of the gas-liquid separator 3 is connected with an inlet of a heat conduction oil filter 5 through a pipeline, an outlet of the heat conduction oil filter 5 is connected with an inlet of a heat conduction oil pump 6 through a pipeline, and an outlet of the heat conduction oil pump 6 is connected with an inlet heat conduction oil pipe entering the groove type solar heat collection environmental field 1 through a pipeline;
the outlet of the molten salt side of the oil/molten salt heat exchanger 2 is connected with a high-temperature molten salt tank 7 through a pipeline, the outlet of the high-temperature molten salt tank 7 is connected with the inlet of a high-temperature molten salt pump 8 through a pipeline, the outlet of the high-temperature molten salt pump 8 is connected with a molten salt/air heat exchanger 9 through a pipeline, the low-temperature outlet of the molten salt side of the molten salt/air heat exchanger 9 is connected with the inlet of a low-temperature molten salt tank 10 through a pipeline, the outlet of the low-temperature molten salt tank 10 is connected with the inlet of a low-temperature molten salt pump 11 through a pipeline, and the outlet of the low-temperature molten salt pump 11 is connected with the low-temperature molten salt side inlet of the oil/molten salt heat exchanger 2 through a pipeline;
an air side inlet of the fused salt/air heat exchanger 9 is connected with the atmosphere, an air side outlet air pipe of the fused salt/air heat exchanger 9 is divided into two paths, one path is connected with an air inlet adjusting air door 21 of the garbage pool through an air inlet pipe 12 of the garbage pool, and an outlet of the air inlet adjusting air door 21 of the garbage pool is connected with an air inlet at the bottom of the garbage pool through an air pipe; the other path is connected with a garbage pool air inlet bypass pipe adjusting air door 20 through a garbage pool air inlet bypass pipe 22, and the outlet of the garbage pool air inlet bypass pipe adjusting air door 20 is connected with a first air inlet pipe and a second air inlet pipe through air pipes.
An expansion tank 4 is attached to the gas-liquid separator 3.
The garbage pool, the primary air system and the secondary air system of the garbage power station are closed systems.
The garbage pool, the primary air system and the secondary air system of the garbage power station comprise a garbage pool, an air preheater, a primary air fan inlet and a secondary air fan inlet, wherein the garbage pool is arranged at a position from the garbage pool to a fuel inlet feed hopper of a boiler hearth; a first door 14 and a second door 13 are arranged at a garbage inlet of the garbage pool; a first gate 15 and a second gate 16 for feeding fuel are arranged at a feed hopper from the garbage pool to a fuel inlet of a boiler hearth; a bypass air duct 23 is arranged beside the air preheater, the front end of the air preheater is provided with an inlet air door 19, and the rear end of the air preheater is provided with an outlet air door 18; the bottom of the garbage pool is provided with an air inlet 27; the upper part of the garbage pool is provided with a primary air suction port and a secondary air suction port 24;
the primary air inlet is provided with a primary air temperature adjusting air door 28, the secondary air inlet is provided with a secondary air temperature adjusting air door 29, and the air inlet pipeline of the garbage pool is provided with a garbage pool air inlet temperature adjusting air door 30.
The groove type solar heat collection, heat storage and heat exchange system comprises a linear Fresnel solar heat collection system.
An operation method of a system for improving the inlet air temperature and the fuel heat value of a garbage power station by groove type solar energy comprises the following steps;
under the illumination condition in daytime, the groove type solar heat collection environmental field 1 focuses solar light on the heat absorption pipe 25, high-temperature heat conduction oil working medium in the heat absorption pipe enters the oil/molten salt heat exchanger 2 to heat low-temperature molten salt, the cooled heat conduction oil enters the gas-liquid separator 3 and is discharged by combining the expansion tank 4, the heat conduction oil passing through the gas-liquid separation 3 enters the filter 5, impurities are filtered, the filtered heat conduction oil enters the heat conduction oil pump 6, and the heat conduction oil enters the heat absorption pipe 25 of the groove type solar heat collection environmental field 1 under the pressurization of the heat conduction oil pump, so that the heat conduction oil working cycle is formed. At night, under the condition of no illumination, the heat conduction oil pump stops working, and the heat conduction oil working cycle stops;
under the condition of illumination in the daytime, the low-temperature molten salt pump 11 conveys low-temperature molten salt to the oil/molten salt heat exchanger 2, heat conducting oil transmits heat to the low-temperature molten salt through the oil/molten salt heat exchanger 2, the high-temperature molten salt is stored in the high-temperature molten salt tank 7, the high-temperature molten salt pump 8 conveys the high-temperature molten salt to the molten salt/air heat exchanger 9, the cooled high-temperature molten salt enters the low-temperature molten salt tank 10, air passing through the molten salt/air heat exchanger 9 is heated and then enters the garbage pool air inlet pipe 12 and the garbage pool air inlet bypass pipe 22, under the condition of no illumination at night, the low-temperature molten salt pump 11 stops working, and the heating process of the low-temperature molten salt stops;
after the air is heated by the fused salt/air heat exchanger 9, one path of the air enters the garbage pool through the garbage pool air inlet pipe 12, the garbage pool air inlet adjusting air door 21 and the garbage pool air inlet 27, the temperature of the garbage in the garbage pool can be accurately controlled by adjusting the opening degree of the garbage pool air inlet adjusting air door 21, the opening degree of the garbage pool air inlet bypass pipe adjusting air door 20 and the opening degree of the garbage pool air inlet temperature adjusting air door 30, so that the garbage fermentation is promoted, the garbage heat value is improved, and the air in the garbage pool enters the primary air inlet pipe and the secondary air inlet pipe through the primary air suction port and the secondary air suction port 24 on the upper part of the garbage pool; the other path of the air enters the primary air inlet pipe and the secondary air inlet pipe through the garbage pool air inlet bypass pipe 22 and the garbage pool air inlet bypass pipe adjusting air door 20;
in the normal operation process, the air preheater bypass air door 17 is always in an open state, the air preheater inlet air door 19 and the air preheater outlet air door 18 are in a closed state, the air preheater does not work, steam is not consumed to heat primary air, the primary air is boosted by the primary air fan, enters the air preheater bypass air duct 23 from the primary air inlet pipe and the secondary air inlet pipe, and enters the primary air distribution main pipe after passing through the air preheater bypass air door 17; when the fused salt/air heat exchanger 9 cannot work normally or the primary air temperature is low, an inlet air door 19 and an outlet air door 18 of the air preheater are partially or completely opened, an air preheater bypass air door 17 is closed or closed, the air preheater starts to work, and partial or all air is heated by the air preheater and then mixed with primary air of an air preheater bypass air pipe to enter a primary air distribution main pipe, so that the primary air temperature requirement of the boiler is met; the primary air temperature adjusting air door 28 is used for reducing the inlet air temperature of the primary air fan, and the air door can be opened in an emergency state;
in the normal operation process, secondary air is boosted by a secondary fan and enters a boiler hearth from a primary air inlet pipe and a secondary air inlet pipe to participate in boiler combustion; the secondary air temperature adjusting air door 29 is used for reducing the inlet air temperature of the secondary fan, and the air door can be opened in an emergency state;
the process that the garbage truck dumps rubbish to the rubbish pond does: firstly, opening the first door 14 and simultaneously closing the second door 13, and dumping the garbage between the first door 14 and the second door 13; next, closing the first door 14, then opening the second door 13, and enabling the garbage to enter the garbage pool; finally, closing the two doors 13, and finishing the garbage dumping process;
the process of garbage entering the boiler furnace is as follows: firstly, opening a door 15 at a feed hopper at a fuel inlet of a boiler hearth, and closing a second door 16 at the same time; then, the garbage grabbing hook grabs and then delivers the garbage into the feeding hopper, and the garbage is positioned between the first door 15 and the second door 16; finally, one door 15 is closed, and then two doors 16 are opened, so that the garbage enters the hearth of the boiler and participates in combustion.
Under the condition of illumination in the daytime, the temperature of heat-conducting oil at the G point of the outlet main pipe of the heat absorption pipe 25 of a heat collection environment field 1 can reach 390 ℃, the temperature of high-temperature molten salt at the A point of the outlet of an oil/molten salt heat exchanger 2 can reach 350 ℃, the temperature of air at the B point of the outlet of the molten salt/air heat exchanger 9 can reach 300 ℃, the temperature at the D point of an inlet air pipe of a primary air blower can reach 290 ℃, the temperature at the F point of a primary air distribution main pipe can reach 285 ℃, and the air temperature at the E point of an inlet of a secondary air blower can reach 293 ℃; the air temperature at the air inlet C of the garbage pool reaches the optimal temperature required by garbage fermentation.
The invention has the beneficial effects that:
1. the trough type solar heat collection, heat storage and heat exchange system is arranged, so that the inlet air temperature entering the waste heat boiler can be obviously improved, and the system can be used for 24 hours, so that the consumption of main steam and one-section steam extraction for heating the air preheater is reduced or eliminated, and the generating power and the generating efficiency of a unit are obviously improved;
2. the system can accurately control the temperature of the garbage in the garbage pool, can promote the fermentation process of the garbage in the garbage pool by properly improving the air temperature of the garbage pool, and effectively improves the heat value of fuel garbage, thereby improving the heat efficiency of the waste heat boiler;
3. by adopting the invention, the temperature of the primary air and the secondary air of the refuse power station can be obviously improved, the temperature of the primary air distribution main pipe can reach 285 ℃, and the temperature of the secondary air inlet air can reach 293 ℃, thereby obviously improving the overall efficiency of the system.
Drawings
FIG. 1 is a system for increasing inlet air temperature and fuel calorific value of a refuse power station by using trough solar energy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a system for increasing inlet air temperature and fuel calorific value of a refuse power station by using trough solar energy needs to improve and design a refuse pool and a primary air system and a secondary air system of an existing refuse power station; in addition, a module 1-groove type solar heat collection, heat storage and heat exchange system is added.
Carry out the improved design to current garbage power station rubbish pond and one, overgrate air system and mainly include:
(1) the garbage pool is designed into a closed system and is not directly communicated with the atmospheric environment;
(2) arranging a first door 14 and a second door 13 of a garbage inlet of the garbage pool;
(3) a first gate 15 and a second gate 16 for feeding fuel are arranged at a feed hopper from the garbage pool to a fuel inlet of a boiler hearth;
(4) an air preheater bypass air duct 23 is added;
(5) adding an air preheater bypass damper 17;
(6) an inlet air door 19 and an outlet air door 18 of the air preheater are added;
(7) the bottom of the garbage pool is provided with an air inlet 27;
(8) the upper part of the garbage pool is provided with a primary air suction port and a secondary air suction port 24;
(9) a primary air temperature adjusting air door 28 is arranged at the inlet of the primary air fan;
(10) the inlet of the secondary fan is provided with a secondary air temperature adjusting air door 29; the air inlet pipeline of the garbage pool is provided with an air inlet temperature adjusting air door 30 of the garbage pool.
The added module 1-groove type solar heat collection, heat storage and heat exchange system comprises: the system comprises a groove type solar heat collection environmental field 1, a heat conduction oil heat absorption pipe 25, an oil/molten salt heat exchanger 2, a gas-liquid separator 3, an expansion groove 4, a heat conduction oil filter 5, a heat conduction oil pump 6, a high-temperature molten salt tank 7, a high-temperature molten salt pump 8, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a molten salt/air heat exchanger 9, a garbage pool air inlet pipe 12, a garbage pool air inlet bypass pipe 22, a garbage pool air inlet adjusting air door 21, a garbage pool air inlet bypass pipe adjusting air door 20 and the like.
The increased module 1-groove type solar heat collection, heat storage and heat exchange system has the following equipment connection modes:
(1) the heat conducting oil heat absorption pipe 25 is arranged in the groove type solar heat collection environmental field 1, an outlet main pipe of the heat conducting oil heat absorption pipe 25 is connected with a high-temperature heat conducting oil inlet of the oil/molten salt heat exchanger 2, a low-temperature heat conducting oil outlet of the oil/molten salt heat exchanger 2 is connected with a heat conducting oil inlet of the gas-liquid separator 3 through a pipeline, the expansion groove 4 is connected with the gas-liquid separator 3 through auxiliary equipment, an outlet of the gas-liquid separator 3 is connected with an inlet of the heat conducting oil filter 5 through a pipeline, an outlet of the heat conducting oil filter 5 is connected with an inlet of the heat conducting oil pump 6 through a pipeline, and an outlet of the heat conducting oil pump 6 is connected with an inlet heat conducting oil pipe entering the groove type solar heat collection environmental field 1 through a pipeline.
(2) 2 fused salt side exports of oil/fused salt heat exchanger are connected with high temperature fused salt jar 7 through the pipeline, 7 exports of high temperature fused salt jar are connected with 8 imports of high temperature fused salt pump through the pipeline, 8 exports of high temperature fused salt pump are connected with fused salt/air heat exchanger 9 through the pipeline, 9 fused salt side low temperature exports of fused salt/air heat exchanger are connected with 10 imports of low temperature fused salt jar through the pipeline, 10 exports of low temperature fused salt jar are connected with 11 imports of low temperature fused salt pump through the pipeline, 11 exports of low temperature fused salt pump are connected with 2 low temperature fused salt side entrys of oil/fused salt heat exchanger through the pipeline.
(3) An air side inlet of the fused salt/air heat exchanger 9 is connected with the atmosphere, an air side outlet air pipe of the fused salt/air heat exchanger 9 is divided into two paths, one path is connected with an air inlet adjusting air door 21 of the garbage pool through an air inlet pipe 12 of the garbage pool, and an outlet of the air inlet adjusting air door 21 of the garbage pool is connected with an air inlet at the bottom of the garbage pool through an air pipe; the other path is connected with a garbage pool air inlet bypass pipe adjusting air door 20 through a garbage pool air inlet bypass pipe 22, and the outlet of the garbage pool air inlet bypass pipe adjusting air door 20 is connected with a first air inlet pipe and a second air inlet pipe through air pipes.
The added module 1-groove type solar heat collection, heat storage and heat exchange system and the whole system working process after the improvement design is carried out on the garbage pool, the primary air system and the secondary air system of the existing garbage power station are as follows:
(1) under the illumination condition in daytime, the groove type solar heat collection environmental field 1 focuses solar light on the heat absorption pipe 25, high-temperature heat conduction oil working medium in the heat absorption pipe enters the oil/molten salt heat exchanger 2 to heat low-temperature molten salt, the cooled heat conduction oil enters the gas-liquid separator 3 and is discharged by combining the expansion tank 4, the heat conduction oil passing through the gas-liquid separation 3 enters the filter 5, impurities are filtered, the filtered heat conduction oil enters the heat conduction oil pump 6, and the heat conduction oil enters the heat absorption pipe 25 of the groove type solar heat collection environmental field 1 under the pressurization of the heat conduction oil pump, so that the heat conduction oil working cycle is formed. And at night, under the condition of no illumination, the heat conduction oil pump stops working, and the heat conduction oil working cycle stops.
(2) Under the condition of illumination in the daytime, the low-temperature molten salt pump 11 conveys low-temperature molten salt to the oil/molten salt heat exchanger 2, heat conducting oil transmits heat to the low-temperature molten salt through the oil/molten salt heat exchanger 2, the high-temperature molten salt is stored in the high-temperature molten salt tank 7, the high-temperature molten salt pump 8 conveys the high-temperature molten salt to the molten salt/air heat exchanger 9, the cooled high-temperature molten salt enters the low-temperature molten salt tank 10, and air passing through the molten salt/air heat exchanger 9 enters the air inlet pipe 12 of the garbage pool and the air inlet bypass pipe 22 of the garbage pool after being heated by the heater. And under the condition of no illumination at night, the low-temperature molten salt pump 11 stops working, and the heating process of the low-temperature molten salt stops.
(3) After the air is heated by the fused salt/air heat exchanger 9, one path of the air enters the garbage pool through the garbage pool air inlet pipe 12, the garbage pool air inlet adjusting air door 21 and the garbage pool air inlet 27, the temperature of the garbage in the garbage pool can be accurately controlled by adjusting the opening degree of the garbage pool air inlet adjusting air door 21, the opening degree of the garbage pool air inlet bypass pipe adjusting air door 20 and the opening degree of the garbage pool air inlet temperature adjusting air door 30, so that the garbage fermentation is promoted, the garbage heat value is improved, and the air in the garbage pool enters the primary air inlet pipe and the secondary air inlet pipe through the primary air suction port and the secondary air suction port 24 on the upper part of the garbage pool; the other path of the air flow enters the primary air inlet pipe and the secondary air inlet pipe through the garbage pool air inlet bypass pipe 22 and the garbage pool air inlet bypass pipe adjusting air door 20.
(4) In the normal operation process, the air preheater bypass air door 17 is always in an open state, the air preheater inlet air door 19 and the air preheater outlet air door 18 are in a closed state, the air preheater does not work, steam is not consumed to heat primary air, the primary air is boosted by the primary air fan, enters the air preheater bypass air duct 23 from the primary air inlet pipe and the secondary air inlet pipe, and enters the primary air distribution main pipe after passing through the air preheater bypass air door 17; when the fused salt/air heat exchanger 9 cannot work normally or the primary air temperature is low, an inlet air door 19 and an outlet air door 18 of the air preheater are partially or completely opened, an air preheater bypass air door 17 is closed or closed, the air preheater starts to work, and partial or all air is heated by the air preheater and then mixed with primary air of an air preheater bypass air pipe to enter a primary air distribution main pipe, so that the primary air temperature requirement of the boiler is met; the primary air temperature damper 28 is used to reduce the temperature of the primary air inlet of the primary air blower and is opened in case of an emergency.
(5) In the normal operation process, secondary air is boosted by a secondary fan and enters a boiler hearth from a primary air inlet pipe and a secondary air inlet pipe to participate in boiler combustion; the secondary air temperature adjusting air door 29 is used for reducing the inlet air temperature of the secondary air fan, and can be opened in an emergency state.
(6) The process that the garbage truck dumps rubbish to the rubbish pond does: firstly, opening the first door 14 and simultaneously closing the second door 13, and dumping the garbage between the first door 14 and the second door 13; next, closing the first door 14, then opening the second door 13, and enabling the garbage to enter the garbage pool; finally, the two doors 13 are closed, and the garbage dumping process is finished.
(7) The process of garbage entering the boiler furnace is as follows: firstly, opening a door 15 at a feed hopper at a fuel inlet of a boiler hearth, and closing a second door 16 at the same time; then, the garbage grabbing hook grabs and then delivers the garbage into the feeding hopper, and the garbage is positioned between the first door 15 and the second door 16; finally, one door 15 is closed, and then two doors 16 are opened, so that the garbage enters the hearth of the boiler and participates in combustion.
Under the condition of illumination in the daytime, the temperature of heat-conducting oil at the G point of the outlet main pipe of the heat absorption pipe 25 of a heat collection environment field 1 can reach 390 ℃, the temperature of high-temperature molten salt at the A point of the outlet of an oil/molten salt heat exchanger 2 can reach 350 ℃, the temperature of air at the B point of the outlet of the molten salt/air heat exchanger 9 can reach 300 ℃, the temperature at the D point of an inlet air pipe of a primary air blower can reach 290 ℃, the temperature at the F point of a primary air distribution main pipe can reach 285 ℃, and the air temperature at the E point of an inlet of a secondary air blower can reach 293 ℃; the air temperature at the air inlet C of the garbage pool reaches the optimal temperature required by garbage fermentation.
The linear Fresnel type heat collecting device is simplified as a groove type system, and essentially adopts a plane mirror to replace a curved mirror, and sunlight is reflected to the heat collecting tube 25 to heat working media by adjusting the inclination angle of the plane mirror, so that the groove type solar energy comprises the linear Fresnel solar heat collecting system.
Claims (7)
1. A system for improving the inlet air temperature and the fuel heat value of a garbage power station by groove type solar energy is characterized by comprising a groove type solar heat collection, heat storage and heat exchange system arranged on a garbage pool, a primary air system and a secondary air system of the garbage power station;
the groove type solar heat collection, heat storage and heat exchange system comprises a groove type solar heat collection environmental field (1), a heat conduction oil heat absorption pipe (25) is arranged in the groove type solar heat collection environmental field (1), an outlet main pipe of the heat conduction oil heat absorption pipe (25) is connected with a high-temperature heat conduction oil inlet of an oil/molten salt heat exchanger (2), a low-temperature heat conduction oil outlet of the oil/molten salt heat exchanger (2) is connected with a heat conduction oil inlet of a gas-liquid separator (3) through a pipeline, an outlet of the gas-liquid separator (3) is connected with an inlet of a heat conduction oil filter (5) through a pipeline, an outlet of the heat conduction oil filter (5) is connected with an inlet of a heat conduction oil pump (6) through a pipeline, and an outlet of the heat conduction oil pump (6) is connected with a heat conduction oil pipe entering the groove type solar heat collection environmental field (1) through a pipeline;
the outlet of the molten salt side of the oil/molten salt heat exchanger (2) is connected with a high-temperature molten salt tank (7) through a pipeline, the outlet of the high-temperature molten salt tank (7) is connected with the inlet of a high-temperature molten salt pump (8) through a pipeline, the outlet of the high-temperature molten salt pump (8) is connected with a molten salt/air heat exchanger (9) through a pipeline, the low-temperature outlet of the molten salt side of the molten salt/air heat exchanger (9) is connected with the inlet of a low-temperature molten salt tank (10) through a pipeline, the outlet of the low-temperature molten salt tank (10) is connected with the inlet of a low-temperature molten salt pump (11) through a pipeline, and the outlet of the low-temperature molten salt pump (11) is connected with the low-temperature molten salt side inlet of the oil/molten salt heat exchanger (2) through a pipeline;
an air side inlet of the molten salt/air heat exchanger (9) is connected with the atmosphere, an air side outlet air pipe of the molten salt/air heat exchanger (9) is divided into two paths, one path is connected with a garbage pool air inlet adjusting air door (21) through a garbage pool air inlet pipe (12), and an outlet of the garbage pool air inlet adjusting air door (21) is connected with an air inlet at the bottom of the garbage pool through an air pipe; the other path is connected with a garbage pool air inlet bypass pipe adjusting air door (20) through a garbage pool air inlet bypass pipe (22), and the outlet of the garbage pool air inlet bypass pipe adjusting air door (20) is connected with a first air inlet pipe and a second air inlet pipe through air pipes.
2. The system for increasing the inlet air temperature and the fuel calorific value of the refuse power station by using the trough type solar energy as claimed in claim 1, wherein an expansion tank (4) is additionally connected to the gas-liquid separator (3).
3. The system for increasing the inlet air temperature and the fuel calorific value of the refuse power station by using the trough type solar energy as claimed in claim 1, wherein the refuse pool and the primary and secondary air systems of the refuse power station are closed systems.
4. The system for increasing the inlet air temperature and the fuel calorific value of the refuse power station by the trough solar energy as claimed in claim 1, wherein the refuse pool of the refuse power station and the primary and secondary air systems comprise a feed hopper from the refuse pool to the fuel inlet of the boiler hearth, an air preheater, a primary air fan inlet and a secondary air fan inlet; a first door (14) and a second door (13) are arranged at a garbage inlet of the garbage pool; a first gate (15) and a second gate (16) for feeding fuel are arranged at a feed hopper from the garbage pool to a fuel inlet of a boiler hearth; a bypass air duct (23) is arranged beside the air preheater, the front end of the air preheater is provided with an inlet air door (19), and the rear end of the air preheater is provided with an outlet air door (18); the bottom of the garbage pool is provided with an air inlet (27); the upper part of the garbage pool is provided with a primary air suction port and a secondary air suction port (24);
the primary air inlet is provided with a primary air temperature adjusting air door (28), the secondary air inlet is provided with a secondary air temperature adjusting air door (29), and the air inlet pipeline of the garbage pool is provided with a garbage pool air inlet temperature adjusting air door (30).
5. The system of claim 1, wherein the trough solar heat collection, storage and exchange system comprises a linear fresnel solar heat collection system.
6. The operation method of the system for increasing the inlet air temperature and the fuel heat value of the refuse power station by the trough type solar energy based on any one of claims 1 to 5 is characterized by comprising the following steps;
under the condition of illumination in the daytime, solar light is focused on a heat absorption pipe (25) by the groove type solar heat collection environmental field (1), a high-temperature heat conduction oil working medium in the heat absorption pipe enters the oil/molten salt heat exchanger (2) to heat low-temperature molten salt, the cooled heat conduction oil enters the gas-liquid separator (3) to be discharged by combining with the expansion groove (4), the heat conduction oil subjected to gas-liquid separation (3) enters the filter (5) to filter impurities, the filtered heat conduction oil enters the heat conduction oil pump (6) to enter the heat absorption pipe (25) of the groove type solar heat collection environmental field (1) under the pressurization of the heat conduction oil pump to form a heat conduction oil working cycle, and the heat conduction oil pump stops working and stops working under the condition of no illumination at night;
under the condition of illumination in the daytime, the low-temperature molten salt pump (11) conveys low-temperature molten salt to the oil/molten salt heat exchanger (2), heat conducting oil transmits heat to the low-temperature molten salt through the oil/molten salt heat exchanger (2), the high-temperature molten salt is stored in the high-temperature molten salt tank (7), the high-temperature molten salt pump (8) conveys the high-temperature molten salt to the molten salt/air heat exchanger (9), the cooled high-temperature molten salt enters the low-temperature molten salt tank (10), air passing through the molten salt/air heat exchanger (9) is heated and then enters the garbage pool air inlet pipe (12) and the garbage pool air inlet bypass pipe (22), the low-temperature molten salt pump (11) stops working under the condition of no illumination at night, and the heating process of the low-temperature molten salt stops;
after air is heated by a fused salt/air heat exchanger (9), one path of air enters a garbage pool through a garbage pool air inlet pipe (12), a garbage pool air inlet adjusting air door (21) and a garbage pool air inlet (27), the temperature of garbage in the garbage pool is accurately controlled by adjusting the opening degree of the garbage pool air inlet adjusting air door (21), the opening degree of a garbage pool air inlet bypass pipe adjusting air door (20) and the opening degree of a garbage pool air inlet temperature adjusting air door (30), so that garbage fermentation is promoted, the garbage heat value is improved, and the air in the garbage pool enters a primary air inlet pipe and a secondary air inlet pipe through a primary air suction port and a secondary air suction port (24) at the upper part of the garbage pool; the other path of the air enters the primary air inlet pipe and the secondary air inlet pipe through a garbage pool air inlet bypass pipe (22) and a garbage pool air inlet bypass pipe air damper (20);
in the normal operation process, an air preheater bypass air door (17) is always in an open state, an air preheater inlet air door (19) and an air preheater outlet air door (18) are in a closed state, the air preheater does not work, steam is not consumed to heat primary air, the primary air is boosted through a primary air blower, enters an air preheater bypass air duct (23) from a primary air inlet pipe and a secondary air inlet pipe, and enters a primary air distribution main pipe after passing through the air preheater bypass air door (17); when the fused salt/air heat exchanger (9) cannot work normally or the primary air temperature is low, an inlet air door (19) and an outlet air door (18) of the air preheater are partially or completely opened, an air preheater bypass air door (17) is closed or closed, the air preheater starts to work, and partial or all air is heated by the air preheater and then mixed with primary air of an air preheater bypass air pipe to enter a primary air distribution main pipe, so that the primary air temperature requirement of the boiler is met; the primary air temperature adjusting air door (28) is used for reducing the inlet air temperature of the primary fan, and the air door can be opened in an emergency state;
in the normal operation process, secondary air is boosted by a secondary fan and enters a boiler hearth from a primary air inlet pipe and a secondary air inlet pipe to participate in boiler combustion; the secondary air temperature adjusting air door (29) is used for reducing the inlet air temperature of the secondary fan, and the air door can be opened in an emergency state;
the process that the garbage truck dumps rubbish to the rubbish pond does: firstly, opening a first door (14) and closing a second door (13) at the same time, and dumping garbage between the first door (14) and the second door (13); then, closing one door (14), and then opening two doors (13), so that the garbage enters the garbage pool; finally, closing the two doors (13) and finishing the garbage dumping process;
the process of garbage entering the boiler furnace is as follows: firstly, opening a door (15) at a feed hopper of a fuel inlet of a boiler hearth, and closing two doors (16) at the same time; then, the garbage grabbing hook grabs and then delivers the garbage into the feeding hopper, and the garbage is positioned between the first door (15) and the second door (16); finally, one door (15) is closed, and then two doors (16) are opened, so that the garbage enters the hearth of the boiler and participates in combustion.
7. The operation method of the system for increasing the inlet air temperature and the fuel heat value of the refuse power station by using the groove type solar energy as claimed in claim 6 is characterized in that under the condition of illumination in the daytime, the temperature of heat conducting oil at the G point of the outlet main pipe of the heat absorption pipe (25) of the heat collection environmental field (1) can reach 390 ℃, the temperature of high-temperature molten salt at the A point of the outlet of the oil/molten salt heat exchanger (2) can reach 350 ℃, the temperature of air at the B point of the outlet of the molten salt/air heat exchanger (9) can reach 300 ℃, the temperature at the D point of the inlet air pipe of the primary air fan can reach 290 ℃, the temperature at the F point of the primary air distribution main pipe can reach 285 ℃, and the air temperature at the E point of the inlet of the secondary air fan can reach 293 ℃; the air temperature at the air inlet C of the garbage pool reaches the optimal temperature required by garbage fermentation.
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