CN111765488A - Primary air secondary preheating system - Google Patents

Primary air secondary preheating system Download PDF

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Publication number
CN111765488A
CN111765488A CN202010630317.9A CN202010630317A CN111765488A CN 111765488 A CN111765488 A CN 111765488A CN 202010630317 A CN202010630317 A CN 202010630317A CN 111765488 A CN111765488 A CN 111765488A
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China
Prior art keywords
primary air
pipeline
methane
air
combustion
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CN202010630317.9A
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CN111765488B (en
Inventor
华银锋
苏醒
施艇
何一鸣
蔡金华
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Shanghai Liming Resources Reuse Co ltd
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Shanghai Liming Resources Reuse Co ltd
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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
    • F23L15/02—Arrangements of regenerators
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/08—Production of synthetic natural gas
    • C—CHEMISTRY; METALLURGY
    • 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
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • 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
    • C12M43/00—Combinations of bioreactors or fermenters with other apparatus
    • C12M43/04—Bioreactors or fermenters combined with combustion devices or plants, e.g. for carbon dioxide removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • 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
    • Y02E20/12—Heat utilisation in combustion or incineration of waste
    • 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
    • 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
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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  • Biotechnology (AREA)
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Abstract

The invention discloses a primary air secondary preheating system, which comprises an anaerobic system, a transmission system, a burner, a primary air main pipe and an air preheater, wherein the primary air main pipe is connected with the anaerobic system; the primary air main pipe is provided with a primary fan, the air preheater is provided with an air inlet end and an air outlet end, the primary air main pipe is connected with the air inlet end, the anaerobic system is provided with a first methane output end, the transmission system is provided with a first methane inlet end and a second methane output end, the combustor is provided with a second methane inlet end and a combustion end, the first methane output end is connected with the first methane inlet end, the second methane output end is connected with the second methane inlet end, the side wall of the primary air main pipe is provided with a preheating port, and the combustion end penetrates through the preheating port and then is located in the primary air main pipe. The invention utilizes the excess biogas combustion to improve the primary air temperature, reduce the steam usage amount, improve the recycling efficiency of biogas resources and increase the generated energy.

Description

Primary air secondary preheating system
Technical Field
The invention relates to the field of garbage power generation, in particular to a primary air secondary preheating system.
Background
The garbage incineration power generation is one of effective means for harmlessness and reduction of garbage, and the main equipment of the garbage incineration process is an incinerator which converts the internal energy of the garbage into heat energy and gradually converts the heat energy into electric energy through subsequent processes and equipment. The incinerator can be classified into: in the mechanical grate furnace incineration process, hearth air is an important factor influencing the efficiency of the incinerator for treating household garbage, and is divided into primary air and secondary air according to sources, wherein the primary air is mainly combustion air and comes from cooling air outside the hearth, the secondary air is combustion-supporting air and comes from air at the top of a boiler room and flue gas of a slag extractor, and the primary air enters the hearth through a primary air main pipe communicated with a furnace wall under the action of a primary fan.
In order to ensure the temperature in the hearth, the entering primary air needs to be preheated in advance, and at present, a mature and widely applied preheating process in the thermal power plant industry is an air preheater. The air preheater is a kind of equipment used for improving the heat exchange performance of the boiler, reduce energy consumption, the air preheater both ends respectively with burn burning furnace, the female union coupling of primary air, the primary air gets into the air preheater, gets into furnace after the air preheater preheats, the air preheater uses the steam in the boiler as the heat transfer source usually, but has shunted the steam volume that drives generating set through the heating method of steam as the heat transfer source, therefore this mode can cause the problem that the generated energy reduces.
The existing waste incineration power plant is usually provided with biogas power generation equipment at the same time based on different types of waste, biogas power generation usually produces biogas through an anaerobic system in a waste water station tower, the produced biogas (the effective component is methane) is desulfurized through a desulfurization system and then is sent to a biogas power generation unit for combustion and power generation, the biogas amount used by the biogas power generation unit is determined, but due to different contents of organic pollutants in waste liquid sent into the anaerobic system, the biogas sometimes has surplus capacity, and for safety, the surplus biogas in the prior art generally enters torch equipment for direct combustion, so that resource waste is caused.
Disclosure of Invention
The invention aims to provide a primary air secondary preheating system aiming at the defects of the prior art, which improves the primary air temperature by utilizing the excess methane combustion, reduces the steam usage amount, improves the methane resource recycling efficiency and increases the generated energy.
In order to achieve the purpose, the invention provides the following technical scheme: a primary air secondary preheating system comprises an anaerobic system for providing biogas, a transmission system for transmitting the biogas, a burner, a primary air main pipe and an air preheater, wherein a primary air fan for providing primary air into the primary air main pipe is arranged on the primary air main pipe;
the air preheater is provided with an air inlet end and an air outlet end, and the primary air main pipe is connected with the air inlet end;
the anaerobic system is provided with a first biogas output end, the transmission system is provided with a first biogas inlet end and a second biogas output end, and the combustor is provided with a second biogas inlet end and a combustion end;
the first methane output end is connected with the first methane inlet end, and the second methane output end is connected with the second methane inlet end;
the side wall of the primary air main pipe is provided with a preheating opening, and the combustion end penetrates through the preheating opening and then is positioned in the primary air main pipe.
Preferably, in the above-mentioned application, the biogas is introduced from the anaerobic system into the burner through the transport system, and finally introduced into the burning end for ignition.
Preferably, in the above content of the present application, the transmission system includes a booster fan and a gas-water separation device, and the anaerobic system, the booster fan, the gas-water separation device and the burner are sequentially communicated through a transmission pipeline.
Wherein, preferably, the gas-water separation device can realize gas-water separation by adsorbing water.
Preferably, in the above-mentioned content of the present application, the number of the preheating ports is two or more, and a plurality of preheating ports are arranged along the length direction of the primary air header, and the number of the burners corresponds to the number of the preheating ports one to one.
Preferably, in the above content of the present application, the transmission pipeline between the anaerobic system and the booster fan is a first transmission pipeline, the transmission pipeline between the booster fan and the gas-water separation device is a second transmission pipeline, the transmission pipeline between the gas-water separation device and the burner is a third transmission pipeline, the first biogas inlet end is an end of the first transmission pipeline connected with the anaerobic system, and the second biogas outlet end is an end of the third transmission pipeline connected with the burner.
Preferably, in the above-mentioned content of the present application, one or more of the first transfer pipe, the second transfer pipe and the third transfer pipe is provided with a nitrogen purge pipe.
Preferably, in the above description of the present application, the nitrogen purge line is provided with a manual ball valve.
Preferably, in the above-mentioned content of the present application, the first transmission pipeline is provided with a first pressure transmitter.
Preferably, in the above-mentioned content of the present application, a first pressure gauge is disposed on the first transmission pipeline.
Preferably, in the above content of the present application, the first transmission pipeline, the second transmission pipeline, and the third transmission pipeline are all provided with a manual ball valve.
Preferably, in the above-mentioned content of the present application, the nitrogen purging pipeline provided on the first transmission pipeline is a first nitrogen purging pipeline.
Preferably, in the above-mentioned context of the present application, the first nitrogen purge line is one or more.
Preferably, in the above-mentioned aspect of the present application, two manual ball valves are provided on the first transfer line, and the position of the first nitrogen purge line on the first transfer line is located between the two manual ball valves.
Preferably, in the above-mentioned content of the present application, one end of the first transmission pipeline close to the booster fan is provided with a filter.
Preferably, in the above-mentioned application, the number of the ports of the first transmission pipeline connected with the anaerobic system is two or more, and a plurality of the ports are arranged in parallel.
Preferably, in the above-mentioned content of the present application, the number of the booster fans arranged on the first transmission pipeline is two or more, and a plurality of booster fans are arranged in parallel.
Preferably, in the above-mentioned content of the present application, one end of the second transmission pipeline, which is close to the booster fan, is provided with a check valve.
Preferably, in the above content of the present application, the second transmission pipeline and the third transmission pipeline are both provided with a drain pipe, and the drain pipe is provided with a manual ball valve.
Preferably, in the above content of the present application, the drain pipe on the second conveying pipeline is a first drain pipe, and the drain pipe on the third conveying pipeline is a second drain pipe.
Preferably, in the above-mentioned aspect of the present application, the first drain pipe is located between the check valve and the gas-water separation device on the second transfer pipe.
Preferably, in the above-mentioned content of the present application, the nitrogen purge line provided on the third transfer line is a second nitrogen purge line.
Preferably, in the above-mentioned context of the present application, the number of the second nitrogen purge pipes is one or more.
Preferably, in the above-mentioned content of the present application, one or more pressure transmitters are disposed on the third transmission pipeline.
Preferably, in the above-mentioned content of the present application, one or more pressure gauges are disposed on the third conveying pipeline.
Preferably, in the above-mentioned content of the present application, the third conveying pipeline is provided with a pneumatic quick-closing valve.
Preferably, in the above-mentioned content of the present application, the third conveying pipeline is provided with a pneumatic regulating valve.
Preferably, in the above-mentioned content of the present application, a flow meter is disposed on the third transfer pipeline.
Preferably, in the above content of the present application, the burner includes an air-inducing pipeline, a combustion-supporting pipeline, a biogas spray gun and an ignition gun, the biogas spray gun and the ignition gun are parallel to the axis direction of the air-inducing pipeline respectively, two ends of the air-inducing pipeline are respectively a closed end and an open end, the open end of the air-inducing pipeline is a combustion end of the burner, the sidewall of the body of the biogas spray gun and the sidewall of the ignition gun are connected with the closed end respectively, the feed inlet of the biogas spray gun and the feed inlet of the ignition gun are located outside the air-inducing pipeline, the nozzle of the biogas spray gun and the nozzle of the ignition gun are located in the air-inducing pipeline near the open end, and the combustion-supporting pipeline is communicated.
Preferably, in the above-mentioned content of the present application, the outer wall of the combustion supporting cavity is provided with a connecting flange.
Preferably, in the above-mentioned context of the present application, the burner is flanged to the primary air header.
Preferably, in the above description of the present application, the side wall of the combustion supporting duct is provided with a damper actuator.
Preferably, in the above content of the present application, a main nozzle and a hose are disposed between the second output end of the third pipeline and the feed inlet of the biogas spray gun, and the biogas spray gun, the main nozzle, the hose and the third pipeline are sequentially connected.
Preferably, in the above-mentioned context of the present application, the burner is provided with a flame arrester.
Preferably, in the above content of the present application, the air preheater includes a tube box, a steam header and a drain header, the tube box is internally and fixedly provided with a preheating pipe, the two ends of the preheating pipe are respectively an air inlet end and a water discharge end, the steam header is fixedly connected with the tube box, the steam header is communicated with the air inlet end of the preheating pipe, the drain header is fixedly connected with the tube box, and the drain header is communicated with the water discharge end of the preheating pipe.
Preferably, in the above-mentioned application, the tube box is a cavity structure enclosed by an upper top plate, a lower bottom plate, a first baffle plate, a second baffle plate, a first side plate and a second side plate.
Preferably, in the above application, the upper top plate and the lower bottom plate, the first baffle plate and the second baffle plate, and the first side plate and the second side plate are respectively disposed oppositely, wherein the upper top plate is located above the lower bottom plate.
Preferably, in the above application, an upper tube plate and a lower tube plate are fixedly arranged in the tube box, the upper tube plate is parallel to the upper top plate, the lower tube plate is parallel to the lower bottom plate, and the gas inlet end and the water outlet end of the preheating tube are respectively connected with the upper tube plate and the lower tube plate.
Preferably, in the above application, the number of the preheating pipes is plural, and the plural preheating pipes are arranged in parallel with each other.
Preferably, in the above-mentioned aspect of the present invention, the steam header is provided with a steam inlet, the drain header is provided with a condensate outlet, and steam enters the preheating pipe from the steam inlet to exchange heat with the primary air through the inlet end of the preheating pipe, and after condensing, enters the drain header from the drain end of the preheating pipe, and is discharged through the condensate outlet.
Preferably, in the above-mentioned aspect of the present invention, the air inlet end is opened to the first baffle plate, and the air outlet end is opened to the second baffle plate.
Preferably, in the above-mentioned application, the number of the header, the steam header and the drain header is one or more, the air inlet end and the air outlet end of the plurality of sets of header are connected in series, and the steam header and the drain header provided on different header are independent of each other.
Preferably, in the above-mentioned aspect of the present application, the air preheater further includes a bracket, and the bracket is disposed at the bottom of the channel box.
The primary air secondary preheating system provided by the invention can carry out secondary heating on primary air, when the primary air passes through the combustor, the ignition gun ignites methane gushed from the nozzle of the methane spray gun, the nozzle of the methane spray gun continuously burns under the supply of methane, the burnt methane carries out primary heating on the primary air passing through the primary air main pipe, the air heated by the combustor enters the air preheater and passes through the preheating pipe in the pipe box, and steam in the preheating pipe carries out secondary heating on the primary air.
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention;
fig. 2 is a schematic diagram of the operation of the transmission system of the present invention;
FIG. 3 is a schematic view of the position of the equipment mounted on the first transport conduit in the present invention;
FIG. 4 is a schematic view of the position of the equipment installed on the second transport pipeline in the present invention;
FIG. 5 is a schematic view showing the position of the equipment installed on the third transfer pipe in the present invention
FIG. 6 is a schematic view of the structure of the burner of the present invention;
FIG. 7 is a schematic view showing the construction of an air preheater and a primary air header in the present invention.
Reference numerals: 1. an anaerobic system; 2. a transmission system; 201. a booster fan; 202. a gas-water separation device; 203. a first transfer conduit; 204. a second transport pipe; 205. a third transport pipe; 206. purging the pipeline with nitrogen; 207. a pressure transmitter; 208. a pressure gauge; 209. a filter; 210. a manual ball valve; 211. a blow-off pipe; 212. a check valve; 213. a flow meter; 214. a pneumatic quick-closing valve; 215. a pneumatic regulating valve; 3. a burner; 31. an air inducing duct; 32. a combustion-supporting conduit; 33. a biogas spray gun; 34. an ignition gun; 35. a connecting flange; 36. an air door actuator; 37. an extension duct; 4. a primary air main pipe; 41. preheating a port; 5. an air preheater; 51. a pipe box; 511. a first baffle plate; 512. a second baffle plate; 513. an upper tube sheet; 514. a lower tube plate; 52. a steam header; 521. a steam inlet port; 53. a drainage header; 531. a condensed water discharge port; 54. a preheating pipe; 58. a support; 6. a primary air blower.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a primary air secondary preheating system, as shown in figure 1, including anaerobic system 1, transmission system 2, combustor 3, the female pipe 4 of primary air, air heater 5, the female pipe 4 of primary air is connected with air heater 5, be provided with the primary air fan 6 that is used for producing the primary air on the female pipe 4 of primary air, anaerobic system 1, transmission system 2, combustor 3 connects gradually, combustor 3 and the female pipe 4 lateral wall intercommunication of primary air, the marsh gas that anaerobic system 1 produced is transmitted as preheating fuel entering combustor 3 through transmission system 2, the heat that marsh gas burning produced in combustor 3 preheats the primary air in the female pipe 4 of primary air for the first time, the primary air in the female pipe 4 of primary air gets into air heater 5 after, air heater 5 carries out the secondary preheating to the primary air.
As shown in fig. 2, the transmission system 2 includes a booster fan 201, a gas-water separation device 202 and a transmission pipeline, the anaerobic system 1, the booster fan 201, the gas-water separation device 202 and the burner 3 are sequentially communicated through the transmission pipeline, wherein the transmission pipeline between the anaerobic system 1 and the booster fan 201 is a first transmission pipeline 203, the transmission pipeline between the booster fan 201 and the gas-water separation device 202 is a second transmission pipeline 204, and the transmission pipeline between the gas-water separation device 202 and the burner 3 is a third transmission pipeline 205.
As shown in fig. 3, in order to ensure the safety when biogas is transmitted, a nitrogen purging pipeline 206 is arranged on the first transmission pipeline 203, air in the first transmission pipeline 203 is purged by nitrogen before operation, so as to reduce the amount of air mixed into biogas in the pipeline and reduce the possibility of explosion when biogas is ignited, a pressure transmitter 207 and a pressure gauge 208 are arranged on the first transmission pipeline 203 to observe the pressure in the first transmission pipeline 203, and a filter 209 is arranged at one end of the first transmission pipeline 203 close to the booster fan 201 to prevent impurities in biogas from entering the booster fan 201.
One end of the first transmission pipeline 203 is connected with the anaerobic system 1, the other end of the first transmission pipeline is connected with the booster fan 201, and one end is used and one is standby, two parallel ports are arranged at two ends of the first transmission pipeline 203, correspondingly, the anaerobic system 1 is provided with two interfaces, the booster fan 201 is arranged into two, the two parallel ports, close to the anaerobic system 1, of the first transmission pipeline 203 are respectively connected with the two interfaces, the two parallel ports, close to the booster fan 201, of the first transmission pipeline 203 are respectively connected with the two booster fans 201, four ports at two ends of the first transmission pipeline 203 are opened and closed by arranging the manual ball valve 210, and preferably, the booster fan 201 is a Roots booster fan 201.
As shown in fig. 4, two parallel ports are correspondingly arranged at one end of the second transmission pipeline 204 close to the booster fan 201 and connected with the two booster fans 201, the other end of the second transmission pipeline is connected with the gas-water separation device, the pressure of the biogas in the second transmission pipeline 204 is increased under the action of the booster fans 201, moisture in the wet biogas is condensed, the gas-water separation device can remove excessive moisture in the biogas, a drain pipe 211 is arranged at one end of the second transmission pipeline 204 close to the gas-water separation device, and the drain pipe 211 is used for assisting the gas-water separation device to work; the end of the second transmission pipeline 204 close to the booster fan 201 is provided with a check valve 212, the check valve 212 can prevent the high-pressure methane in the second transmission pipeline 204 from flowing back to the first transmission pipeline 203, and the second transmission pipeline is also provided with a manual ball valve 210 for closing the pipeline at a position close to the check valve 212.
As shown in fig. 2 and fig. 5, one end of the third transfer pipeline 205 is connected with the gas-water separation device 202, the other end is connected with the burner 3, the third transfer pipeline 205 is provided with a pneumatic quick-closing valve 214, a pneumatic regulating valve 215 and a manual ball valve 210 to manage the flow of biogas in the pipeline together, by arranging the flow meter 213, the pressure transmitter 207 and the pressure gauge 208 to observe the pressure in the pipe, the third transmission pipe 205 is long, in order to better observe the pressure in the pipeline, the third transmission pipeline 205 is provided with a plurality of pressure transmitters 207 and pressure gauges 208, in a preferred embodiment, the third transfer pipe 205 is provided with pressure transducers 207 and pressure gauges 208 at both end positions, and likewise, the third transfer pipe 205 reduces impurities contained in the biogas by being provided with a sewage drain 211 and a filter 209, respectively, the air in the third conveying pipeline 205 is purged by arranging a nitrogen purging device to reduce the content of the air in the pipeline.
In a preferred embodiment, the end of third transfer duct 205 facing burners 3 may be divided into a plurality of connected parallel ducts, the ports of which are connected to one burner 3 respectively.
As shown in fig. 6 and 7, the burner 3 includes an air inducing duct 31, a combustion supporting duct 32, a biogas spray gun 33 and an ignition gun 34, the air inducing duct 31 is a tubular structure, the biogas spray gun 33 and the ignition gun 34 are respectively parallel to the axial direction of the air inducing duct 31, two ends of the air inducing duct 31 are respectively a closed end and an open end with one closed end, the sidewall of the body of the biogas spray gun 33 and the sidewall of the body of the ignition gun 34 are respectively fixed with the closed end, the feed inlet of the biogas spray gun 33 and the feed inlet of the ignition gun 34 are respectively located outside the air inducing duct 31, the nozzle of the biogas spray gun 33 and the nozzle of the ignition gun 34 are located in the air inducing duct 31 near the open end, the feed inlet of the biogas spray gun 33 is connected with a third transmission channel through a main burner and a hose, the open end of the air inducing duct 31 is provided with a connecting flange 35, the sidewall of the primary air main duct 4 is, the opening end is communicated with the preheating port 41; the combustion-supporting pipeline 32 is communicated with the side wall of the air guiding pipeline 31, one end of the combustion-supporting pipeline 32, which is far away from the air guiding pipeline 31, is connected with a combustion-supporting fan, combustion-supporting air introduced by the combustion-supporting fan enters the air guiding pipeline 31 and is sprayed out from an opening of the air guiding pipeline 31, and an air door actuator 36 for controlling air volume is arranged on the side wall of the combustion-supporting pipeline 32.
In a preferred embodiment, the open end is semi-closed, the open end of the induced air pipeline 31 is coaxially provided with an extension pipeline 37, the extension pipeline 37 is communicated with the open end, one end of the extension pipeline 37 far away from the open end is a deep end, the port of the deep end is an opening, a nozzle of the biogas spray gun 33 and a nozzle of the ignition gun 34 protrude out of the deep end of the extension pipeline 37 and are exposed in the primary air main pipe 4, and when the burner 3 is installed on the primary air main pipe 4, the extension pipeline 37 is positioned inside the primary air main pipe 4; when the device is used, the feeding port of the ignition gun 34 is fed and ignited firstly, then the biogas enters the biogas spray gun 33, the ignition gun 34 ignites the biogas gushed from the nozzle of the biogas spray gun 33, the nozzle of the biogas spray gun 33 is continuously combusted under the supply of the biogas, and the combusted biogas directly heats the primary air passing through the primary air main pipe 4.
As shown in fig. 1 and 7, the air preheater 5 includes a pipe box 51, a steam header 52 and a drainage header 53, the steam header 52 and the drainage header 53 are respectively and fixedly connected to the pipe box 51, the pipe box 51 is a cavity structure enclosed by an upper top plate, a lower bottom plate, a first baffle 511, a second baffle 512, a first side plate and a second side plate, wherein the upper top plate and the lower bottom plate, the first baffle 511 and the second baffle 512, the first side plate and the second side plate are respectively and oppositely disposed, the upper top plate is located above the lower bottom plate, a support 58 is disposed below the pipe box 51, and the support 58 is welded to the lower bottom plate.
An upper tube plate 513, a lower tube plate 514 and a preheating tube 54 are fixedly arranged in the tube box 51, the upper tube plate 513 is parallel to an upper top plate, the lower tube plate 514 is parallel to a lower bottom plate, two ends of the preheating tube 54 are respectively a gas inlet end and a water outlet end, the preheating tube 54 is vertically arranged, a plurality of preheating tubes 54 are arranged, the preheating tubes 54 are arranged in parallel, the upper tube plate 513 and the lower tube plate 514 are used for fixing the preheating tube 54, the gas inlet end and the water outlet end of the preheating tube 54 are respectively connected with the upper tube plate 513 and the lower tube plate 514, the steam header 52 is in flange connection with the upper top plate, the steam header 52 is communicated with the gas inlet end of the preheating tube 54, the water drainage header 53 is in flange connection with the lower bottom plate, and the water drainage header 53 is communicated with the water outlet end of the.
An air inlet connected with the port 4 of the primary air main pipe is formed in the first baffle plate 511, an air outlet used for being connected with an incinerator is formed in the second baffle plate 512, a steam inlet 521 is formed in the steam header 52, a condensate water outlet 531 is formed in the water discharge header 53, when the steam boiler works, steam enters the steam header 52 from the steam inlet 521 and enters the preheating pipe 54 through the air inlet end of the preheating pipe 54, the steam exchanges heat with primary air entering from the air inlet in the pipe box 51, the primary air after heat exchange horizontally flows out from the air outlet, the steam and the primary air are condensed after repeated heat exchange, and condensate water enters the water discharge header 53 from the water discharge end of the preheating pipe 54 and is discharged through the condensate water outlet 531.
The plurality of the tube boxes 51 may be provided with a plurality of sets of the tube boxes 51, the air inlet ends and the air outlet ends of the tube boxes 51 are connected in series, the steam headers 52 and the drain headers 53 provided on different tube boxes 51 are independent of each other, in a preferred embodiment, the tube boxes 51 are provided with two sets, and the steam headers 52 in different tube boxes 51 can be connected with steam with different pressures.
The working conditions of the embodiment are as follows:
when primary air passes through the burner 3, the ignition gun 34 ignites biogas gushing out from the nozzle of the biogas spray gun 33, the biogas is continuously combusted at the nozzle of the biogas spray gun 33 under the supply of biogas, the combusted biogas firstly heats the primary air passing through the primary air main pipe 4, the air heated by the burner 3 enters the air preheater 5 and passes through the preheating pipe 54 in the pipe box 51, and steam in the preheating pipe 54 secondarily heats the primary air.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (10)

1. A primary air secondary preheating system is characterized by comprising an anaerobic system, a transmission system, a burner, a primary air main pipe and an air preheater;
the primary air main pipe is provided with a primary fan, the air preheater is provided with an air inlet end and an air outlet end, the primary air main pipe is connected with the air inlet end, the anaerobic system is provided with a first methane output end, the transmission system is provided with a first methane inlet end and a second methane output end, the combustor is provided with a second methane inlet end and a combustion end, the first methane output end is connected with the first methane inlet end, and the second methane output end is connected with the second methane inlet end;
the side wall of the primary air main pipe is provided with a preheating opening, and the combustion end penetrates through the preheating opening and then is positioned in the primary air main pipe.
2. The primary air secondary preheating system according to claim 1, wherein the transmission system comprises a booster fan and a gas-water separation device, and the anaerobic system, the booster fan, the gas-water separation device and the burner are sequentially communicated through a transmission pipeline;
the transmission pipeline between the anaerobic system and the booster fan is a first transmission pipeline, the transmission pipeline between the booster fan and the gas-water separation device is a second transmission pipeline, and the transmission pipeline between the gas-water separation device and the combustor is a third transmission pipeline.
3. The primary air secondary preheating system of claim 2, wherein one or more of the first transfer pipeline, the second transfer pipeline and the third transfer pipeline is provided with a nitrogen purge pipeline.
4. A primary air secondary preheating system according to claim 2, wherein one or more of the first transmission pipeline, the second transmission pipeline and the third transmission pipeline is provided with a testing device for displaying pressure, preferably, the testing device includes but not limited to a pressure transmitter and a pressure gauge.
5. A primary air secondary preheating system according to claim 2, wherein one or more of the first, second and third transport pipes is provided with a pollution discharge device, preferably the pollution discharge device includes but is not limited to a pollution discharge pipe and a filter.
6. A primary air secondary preheating system according to claim 2, wherein a pneumatic adjusting device is arranged in the third conveying pipeline, preferably, the pneumatic adjusting device includes, but is not limited to, a pneumatic adjusting valve and a pneumatic shutoff valve.
7. The primary air secondary preheating system according to claim 1, wherein the burner comprises a combustion-supporting pipeline, an air guide pipeline, a methane spray gun and an ignition gun, the methane spray gun and the ignition gun are respectively parallel to the axis direction of the combustion-supporting pipeline, two ends of the combustion-supporting pipeline are respectively a closed end and an open end, the open end is a combustion end of the burner, side walls of gun bodies of the methane spray gun and the ignition gun are respectively connected with the closed end, a feed inlet of the methane spray gun and a feed inlet of the ignition gun are positioned outside the combustion-supporting pipeline, a nozzle of the methane spray gun and a nozzle of the ignition gun are positioned in the combustion-supporting pipeline close to the open end, and the air guide pipeline is communicated with the side wall of the combustion-supporting pipeline.
8. The primary air secondary preheating system of claim 7, wherein the burner is flanged to the primary air header.
9. The primary air secondary preheating system of claim 1, wherein the air preheater comprises a tube box, a steam header and a drain header, the tube box is fixedly provided with a preheating tube, the preheating tube has an air inlet end and a water outlet end at two ends, the steam header is fixedly connected with the tube box and is communicated with the air inlet end of the preheating tube, the drain header is fixedly connected with the tube box and is communicated with the water outlet end of the preheating tube.
10. A primary air secondary preheating system according to claim 9, wherein the air preheater further comprises a bracket, the bracket being disposed at the bottom of the tube box.
CN202010630317.9A 2020-07-03 2020-07-03 Primary air secondary preheating system Active CN111765488B (en)

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