CN112066407A - Tangential diffusion coupling flue gas extrinsic cycle multi-element adjustable low-nitrogen combustion equipment - Google Patents
Tangential diffusion coupling flue gas extrinsic cycle multi-element adjustable low-nitrogen combustion equipment Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
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- 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
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
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- 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
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- 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
- F23D14/60—Devices for simultaneous control of gas and combustion air
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- 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
- F23D14/70—Baffles or like flow-disturbing devices
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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
The invention relates to tangential diffusion coupling flue gas external circulation multielement adjustable low-nitrogen combustion equipment which comprises a fuel gas regulation and control system, a fresh air regulation and control system, a flue gas recovery regulation and control system, a fire-leading device, an multielement adjustable diffusion combustion device and a comprehensive control system, wherein the fuel gas regulation and control system is connected with the fresh air regulation and control system; the gas regulation and control system provides gas for the multi-element adjustable diffusion combustion device, the fresh air regulation and control system provides combustion-supporting air for the multi-element adjustable diffusion combustion device, and the flue gas recovery regulation and control system provides the multi-element adjustable diffusion combustion deviceSmoke generated by burning gas is sent back to the multielement adjustable diffusion combustion device again through the fresh air regulation and control system to burn and regulate the nitrogen content of the smoke; the comprehensive control system accurately controls each system and the multi-element adjustable diffusion combustion device, and the coupling boiler intelligently regulates and controls output power to match with energy consumption change of a user side. The invention can realize that the nitrogen oxide and the carbon monoxide in the natural gas combustion stock-out flue gas are both 30mg/Nm3。
Description
Technical Field
The invention relates to the technical field of clean energy, in particular to a tangential diffusion coupling flue gas external circulation multi-element adjustable low-nitrogen combustion device for realizing application of natural gas energy to vacuum of structures such as membrane walls and the like to realize low-nitrogen emission.
Background
With the development of economic society of China, the original energy development mode can not meet the social development requirements, and the energy utilization mode of energy conservation and environmental protection is the current development direction. The national long-term energy development strategy plans to reduce the primary energy consumption of compressed coal to below 50% by weight before 2030. And (3) displaying data: from 2006 to 2015, the global coal and oil consumption specific gravity decreased by about 2.3 percentage points, while the natural gas specific gravity increased by about 1 percentage point. In 2015, the consumption of natural gas in China is as high as 1931 billion cubic meters. The specific gravity of natural gas in primary energy consumption in 2015 is increased from 4.4% to 5.9% in 2010 by 1.5 percentage points. The consumption proportion of natural gas is close to doubling in 2015 in 2020, the natural gas is gradually developed into one of main energy sources in China, the natural gas is primary energy source which is mainly popularized in China, a gas boiler is important equipment for utilizing natural gas energy source in primary energy source application, the natural gas is clean energy source, NOx is generated by combustion in the energy source conversion process, the gas boiler can generate a large amount of nitrogen oxides during combustion, and in the atmospheric environment, the nitrogen oxides mainly have seven existing forms and respectively include: NO, NO2、N2O、NO3、N2O3、N2O4、N2O5. Wherein NO and NO2Under the conditions of photochemical reactions, they are collectively referred to as nitrogen oxides NOx, in order to be converted into each other. The production of nitrogen oxides mainly results from emissions from nature and human activities. In 2013, the emission of nitrogen oxides in the world is nearly 1300 million tons, wherein the fuel is combustedThe combustion emissions account for 29% of the total emissions of human activities. The power generation industry is the main source of NOx emission, and accounts for half of 370 ten thousand tons of total industrial emission, namely nearly 180 ten thousand tons. After nitrogen oxides enter the atmospheric environment, serious harm can be caused to the environment and human health: (1) toxic effect on human body, strong irritation of nitrogen oxide in a certain concentration range, and indication of NO in high concentration for a short time according to EPA report2Can induce respiratory diseases, and can increase the risk of respiratory diseases of children of 5-12 years old. EPA believes that NO is present for a long time2Can cause lung infection and form lesions in the lung. (2) Damaging effects on plants NO2Influence the growth of crops, inhibit the growth of peas and tomatoes and reduce the yield of oranges. (3) In combination with hydrocarbons, nitrogen oxides react under light conditions to form photochemical smog. (4) Nitrogen oxides are also the main cause of acid rain and acid mist formation, NO and NO2Will form NO with the moisture in the surrounding air3-and H+Resulting in severe corrosion of the metal surface. (5) NOx participates in the destruction of the ozone layer. Through studying the low-nitrogen combustion technology of the gas boiler, the condition of nitrogen oxides released in the combustion process of the gas boiler is effectively improved, the quality of the living environment of people can be effectively improved, and the threat of the environment to the health of people is reduced.
According to the article "notice on the pollutant emission standard of advanced gas (oil) boiler nitrogen oxide treatment" (hereinafter referred to as "notice") in 28 th 8 th 18 th in 2016 [ Beijing atmospheric work 2016 ] 34, boiler nitrogen oxide treatment works such as low-nitrogen modification and the like are comprehensively developed in Beijing market to ensure that the concentration of nitrogen oxide emission of a gas (oil) boiler is 80mg/m after 4 th 1 th 4 th in 20173Emission limit of 30mg/m for a newly built boiler3The emission limit of (c).
Disclosure of Invention
The invention designs tangential diffusion coupling flue gas external circulation multielement adjustable low-nitrogen combustion equipment, which solves the technical problems that the existing natural gas combustion device generates NOx in the combustion process, and a gas-fired boiler generates a large amount of nitrogen oxides during combustion.
In order to solve the technical problems, the invention adopts the following scheme:
a tangential diffusion coupling flue gas external circulation multi-element adjustable low-nitrogen combustion device comprises a fuel gas regulation and control system, a fresh air regulation and control system, a flue gas recovery regulation and control system, a fire-leading device, a multi-element adjustable diffusion combustion device and a comprehensive control system; the fuel gas regulation and control system provides fuel gas for the multi-element adjustable diffusion combustion device, the fresh air regulation and control system provides combustion-supporting air for the multi-element adjustable diffusion combustion device, and the flue gas recovery regulation and control system feeds flue gas generated by combustion of the fuel gas of the multi-element adjustable diffusion combustion device back to the multi-element adjustable diffusion combustion device through the fresh air regulation and control system to regulate the nitrogen content of the flue gas; the comprehensive control system accurately controls each system and the multielement adjustable diffusion combustion device, and the coupling boiler intelligently regulates and controls output power to match with energy use change of a user side.
Preferably, the gas regulation and control system comprises a manual cut-off ball valve, a filter, a primary gas direct-reading pressure meter, a gas overpressure detection sensor, a double-valve-body combined cut-off pressure regulating valve, an emergency cut-off actuator, a cut-off pressure regulating actuator, a gas leakage detection sensor, a gas low-pressure detection sensor, a secondary gas pressure direct-reading pressure meter, a gas flow regulating valve, a gas flow regulating actuator, a fire-firing pressure reducing valve and a fire-firing electromagnetic valve, and the components realize the full-proportion regulation of the gas safety monitoring and the full flow.
Preferably, the fresh air regulation and control system comprises a fresh air flow regulating valve, a fresh air flow regulating actuator, an air blower, an air box, a wind pressure sensor and a combustion cylinder, and the components realize the proportion regulation of the full flow of the fresh air system.
Preferably, the diameter, the length and the front end closing angle of the combustion cylinder have significant influence on the combustion efficiency and the emission of nitrogen oxides, and the values are verified through theoretical calculation and a large number of tests, so that the condition that the combustion assisting gas pipe moves axially to the foremost end and is parallel to the starting end face of the closing of the combustion cylinder is optimal, and the closing angle is 55 degrees and is the optimal value.
Preferably, the flue gas recovery regulation and control system comprises a flue gas recovery pipe, a flue gas flow regulating valve, a flue gas flow regulating actuator, a flue gas temperature sensor and a flue gas fresh air mixer, and the components realize the proportion regulation of the full flow of the flue gas recovery regulation and control system.
Preferably, many adjustable dispersion combustion device include the combustion cylinder, optical sensor, high-frequency ignition transformer, the point firearm, the burning torch, combustion-supporting wind radome fairing, central air supplement device, burner head regulator, adjustable burner head, adjustable steady flame dish, removable gas nozzle, the realization is to the effective mixture of combustion-supporting wind and gas, through many adjustable regulations messenger both guarantee the reaction intensity of diffusion combustion and reduce thermal type nitrogen oxide, guarantee the emission below 30mg/Nm year, guarantee the sufficiency and the stability of burning again, guarantee the emission of carbon monoxide below 30mg/Nm year.
Preferably, the multielement adjustable dispersion combustion device adjusts the axial movement of the combustion head through the combustion head adjuster, can adjust the diameter of the combustion flame and the length of the flame, and adjusts the temperature of the combustion core area to adjust the generation of thermal nitrogen oxides; or the multi-element adjustable dispersive combustion device adjusts the mixing of combustion-supporting air and fuel gas or flue gas, combustion-supporting air and fuel gas by adjusting the adjustable flame-stabilizing disc to move axially along the main fuel gas pipe, so as to ensure the uniformity of the mixing; or, the adjustable dispersed combustion device of many units adjusts combustion head axial displacement and adjustable steady flame dish through the combustion head regulator and adjusts through flame diameter, flame length and the regulation of mixing homogeneity linkage along main gas pipe axial displacement and guarantee that nitrogen oxide and carbon monoxide discharge all reduce to below 30 mg/Nm.
Preferably, the comprehensive control system can detect, alarm and display ultrahigh gas pressure, ultralow gas pressure, gas leakage and abnormal gas pressure through the gas regulation and control system, and controls the multielement adjustable dispersed combustion device according to the alarm condition; or/and the comprehensive control system can regulate and stabilize the pressure in a certain unit of the gas inlet pressure through the gas regulating and controlling system so as to ensure the stability and output of combustion; or/and the comprehensive control system senses the operation parameters of each sensor, immediately cuts off the gas emergency cut-off actuator when the operation safety state is threatened, and cuts off the gas supply to ensure safety.
Preferably, the gas flow regulating valve of the gas regulating and controlling system ensures the linearity of flow regulation by using a special-shaped design, the regulating precision of a gas flow regulating actuator reaches 0.001, and the linearity and the regulating precision of gas flow change are ensured; or/and the adjustment precision of a flow adjustment actuator of the fresh air regulation and control system reaches 0.001, so that the linearity of the change of the gas flow is ensured; or/and the flue gas flow regulating actuator of the flue gas recovery regulating and controlling system has the regulating precision of 0.001, so that the linearity of the change of the gas flow is ensured.
Preferably, the comprehensive control system comprehensively controls the combustion state to match with the output of a user through a furnace body sensor, a combustion device sensor and an ambient temperature sensor, and performs automatic compensation and safety detection according to a program; or/and the comprehensive control system carries out remote communication through a communication module; or/and the integrated control system has the following extended functions: the system comprises an Internet of things module, a plurality of joint control modules and a climate compensation module.
Preferably, the multiple adjustable diffusion combustion device comprises a main gas pipe (219), one end of the main gas pipe (219) is connected with an adjustable flame stabilizing disc (2113) through a multiple adjustable combustion head (2115), and the adjustable flame stabilizing disc (2113) and the multiple adjustable combustion head (2115) can move relatively to keep the connection but change the overall length; an adjusting plate is arranged on the adjustable flame stabilizing disc (2113), a plurality of position adjusting fixing holes (2112A) are formed in different positions of the adjusting plate, and the multi-element adjustable combustion head (2115) can be fixed with the adjusting fixing holes (2112A) in different positions through bolts; the other end of the main gas pipe (219) is connected with a fixing plate, an annular fairing (217) is connected onto the fixing plate, a plurality of combustion-supporting air spray holes (2113A) are formed in the adjustable flame stabilizing disc (2113) along the radius direction, and a plurality of surplus air overflow ports (2113B) are formed in the adjustable flame stabilizing disc (2113) in the circumferential direction at intervals; each surplus air volume overflow opening (2113B) is correspondingly provided with an adjustable gas nozzle (2114); the fixed plate is provided with a pilot gun gas interface (215) and a high-pressure igniter interface (216), one end of the pilot gun is connected with the pilot gun gas interface (215), the other end of the pilot gun is connected with a pilot gun combustion head (2116), and the pilot gun combustion head (2116) is connected with the high-pressure igniter interface (216) through a lead; one end of a combustion head adjusting pull rod (218) is connected with the outer wall of the multi-element adjustable combustion head (2115) through a multi-element adjustable combustion head fixing frame (2110), the other end of the combustion head adjusting pull rod (218) is connected with a combustion head position adjuster (213) on the fixing plate, and the combustion head position adjuster (213) rotates to enable the fixing plate to move axially along the main gas pipe (219) so as to drive the multi-element adjustable combustion head (2115) and the adjustable flame stabilizing disc (2113) to move; the multi-element adjustable combustion head (2115) is further provided with a central air supplement port (2111), and the fixing plate is further provided with a photoelectric sensor (212) and a flame observation hole (214).
The tangential diffusion coupling flue gas external circulation multi-element adjustable low-nitrogen combustion equipment has the following beneficial effects:
(1) the invention can realize that the nitrogen oxide and the carbon monoxide in the natural gas combustion stock-out flue gas are both 30mg/Nm3。
(2) The multi-element adjustable dispersive combustion device provided by the invention is provided with the adjustable combustion head and the adjustable flame stabilizing disc coupled combustion cylinder, so that the combustion state can be adjusted in multiple targets, and the amount of carbon monoxide and nitrogen oxide in the discharged flue gas is ensured.
(3) The specially-arranged fairing is designed in the multielement adjustable dispersed combustion device, so that the combustion-supporting air and the externally-circulated flue gas can be rectified, and the mixed effect of the rectified combustion-supporting air is better.
(4) The central air supply port is designed in the multielement adjustable dispersion combustion device, and two-stage air distribution inside and outside is formed through the central air supply port, so that the combustion efficiency is improved, and the carbon monoxide emission is reduced.
(5) The multi-element adjustable dispersive combustion device has the advantages of full-proportional adjustment among combustion participating elements of fuel gas, combustion-supporting air and flue gas recovery, flexible matching, high adjustment progress and good linearity.
(6) The multielement adjustable dispersed combustion device can be highly coupled with the furnace body through the integrated control system to automatically adjust the output load according to the change of the user requirements, has various expansion functions, and can be flexibly combined to meet the requirements of different users.
Drawings
FIG. 1: the invention relates to a structural schematic diagram of tangential diffusion coupling flue gas external circulation multi-element adjustable low-nitrogen combustion equipment;
FIG. 2: the structure of the multi-element adjustable burner in figure 1 is schematically shown.
FIG. 3: FIG. 1 is a schematic view of a combustion can
FIG. 4: FIG. 2 is a schematic view of a flame stabilizing disc
Description of reference numerals:
1, connecting a gas inlet with a flange; 2-gas manual valve; 3-a first gas pressure gauge; 4-gas emergency cut-off actuator; 5-gas overpressure detecting sensor; 6-gas filter; 7-gas pressure sensor; 8-gas pressure regulating and cutting off actuator; 9-gas leakage detection sensor; 10, cutting off the pressure regulating valve by the double-valve body combination; 11-a second gas pressure gauge; 12-gas flow regulating actuator; 13-gas flow regulating valve; 14-a pilot fire pressure reducing valve; 15-ignition electromagnetic valve; 16-a comprehensive controller; 17-combustion-supporting air blower; 18-a combustion can; 19-fresh air flow adjusting actuator; 20-a wind box; 21-a multi-element adjustable burner; 22-blower amortization cover; 23-flue gas flow regulating valve; 24-flue gas flow rate adjusting actuator; 25-gas-water separation box; 26-external flue gas circulation pipe; 27-equipment fixing base; 28-tail smoke box;
181-closing up the combustion cylinder; 182-a fixed flange;
211-gas interface flange; 212-a photosensor; 213-burner position regulator; 214-flame viewing aperture; 215-pilot gun gas interface; 216 — high pressure igniter interface; 217-cowling; 218-combustion head adjusting tie rod; 219-main gas pipe; 2110-multiple adjustable burner fixing frames; 2111 — central air supply; 2112-adjustable flame stabilizing disc regulator; 2112A-position adjustment fixing hole; 2113-adjustable flame stabilizing disk; 2113A-hole for combustion supporting air; 2113B-excess air flow overflow; 2114 — adjustable gas nozzle; 2115-multiple adjustable burner head; 2116-pilot burner.
Detailed Description
The invention is further illustrated below with reference to fig. 1 to 4:
the invention relates to tangential diffusion combustion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion equipment which comprises a fuel gas regulation and control system, a fresh air regulation and control system, a flue gas recovery regulation and control system, a fire-leading device, a combustion safety monitoring system, a recovered flue gas and fresh air mixing control system, a multi-element adjustable dispersion combustion device and a comprehensive control system.
The gas regulation and control system comprises a gas manual cut-off valve 2, a gas filter 6, a first gas pressure gauge 3, a gas overpressure detection sensor 5, a double-valve-body combined cut-off pressure regulating valve 10, a gas emergency cut-off actuator 4, a gas pressure regulating cut-off actuator 8, a gas leakage detection sensor 9, a gas low-pressure detection sensor 7, a second gas pressure gauge 11, a gas flow regulating valve 13, a gas flow regulating actuator 12, a fire-leading pressure reducing valve 14 and a fire-leading electromagnetic valve 15, and the full-proportion regulation of the gas safety monitoring and the full flow is realized.
The fresh air regulation and control system comprises a fresh air flow regulating valve, a fresh air flow regulating actuator 19, a combustion-supporting air blower 17, an air box 20, an air pressure sensor and a combustion cylinder 18, and realizes the proportion regulation of the total flow of the fresh air system.
The flue gas recycling regulation and control system comprises an external flue gas circulating pipe 26, a flue gas flow regulating valve 23, a flue gas flow regulating actuator 19, a flue gas temperature sensor and a flue gas fresh air mixer, and realizes the proportion regulation of the full flow of a fresh air system.
Many first adjustable combustors 21, it includes flame observation hole 214, photoelectric sensor 212, high frequency ignition transformer, some firearms, the burning torch, combustion-supporting wind radome fairing 217, the wind device is mended in the center, burner position regulator 213, adjustable burner 2115, adjustable steady flame dish 2113, adjustable gas nozzle 2114, the realization is to the effective mixture of combustion-supporting wind with the gas, make the reaction intensity who both guarantees the diffusion burning through many first regulations and reduce thermal type nitrogen oxide, guarantee the emission and manage below the year at 30mg/Nm, guarantee the sufficiency and the stability of burning again, guarantee the emission of carbon monoxide and manage below the year at 30 mg/Nm.
The comprehensive control system comprises a main controller, a flame detection signal converter, a communication module, a fan frequency converter, a touch screen, a buzzer, an alarm lamp, an environment temperature sensor, a repressing sensor, a furnace body temperature sensor and a water supply and return temperature sensor, realizes the accurate control of each composition system of the combustion device, and the energy consumption of the coupling boiler intelligent regulation output power matching user side is changed.
The gas enters a flange 1 through a gas inlet, enters a first gas pressure gauge 3 through a gas manual valve 2 and a gas filter 6, enters an inlet of a double-valve-body combined cut-off pressure regulating valve 10 through a gas overpressure detection sensor 5, the valve is in a double-valve closing state before the double-valve-body combined cut-off pressure regulating valve 10 is not started, when combustion equipment is started through a human-computer interaction interface touch screen of the integrated control system, the integrated control system firstly detects the gas pressure through a gas pressure sensor 7, the conditions including ultrahigh pressure, ultralow pressure, gas leakage and the like, and the integrated system can give out audible and visual alarm and interrupt operation when the gas pressure and the gas tightness are abnormal, displays alarm information and assists in solving fault points.
After confirming that gas system and gas pressure are normal, integrated control system starts combustion-supporting air blower 17 through the converter, and detect the wind pressure through air blower wind pressure sensor, also will shut down the warning and carry out alarm information display if the wind pressure is unusual, wind pressure is normal after through new trend flow control executor 19 drive new trend flow control valve with the governing valve position to open carry out the front blow replacement furnace interior gas to burner and furnace, reach integrated control system and set for after the time of sweeping, after the front blow is finished, new trend flow control executor 19 drives new trend flow control valve and transfers the governing valve position to the control valve position that the ignition needs the combustion-supporting amount of wind, and feed back valve position signal to integrated control system, valve position feedback precision reaches 0.001.
At the moment, the integrated control system opens a first cut-off valve of the double-valve-body combined cut-off pressure regulating valve 10 through the emergency cut-off actuator, gas enters the valve body through the first cut-off valve, enters the ignition pressure regulating valve 14 through the inlet of the ignition tube, enters the ignition electromagnetic valve 15 after pressure regulation, the integrated control system is switched on at the moment, the ignition transformer releases 8KV voltage at the end part of the ignition gun through the tip end of the ignition rod to ignite the gas entering the ignition gun, simultaneously the integrated control system converts the detected optical signal into an electric signal through the photoelectric sensor 212, the signal is subjected to noise reduction and isolation through the signal converter and then is sent to the integrated control system, the signal is sent after the ignition success is determined after the stable optical signal is obtained, a second valve of the double-valve-body combined cut-off pressure regulating valve 10 is opened through the gas flow regulating, Meanwhile, the gas flow regulating actuator 12 obtains a control signal of the integrated control system, sets a valve position for ignition regulated by the gas flow regulating valve 13 and feeds a valve position signal back to the integrated controller, and the position feedback precision reaches 0.001.
The gas enters the multi-element adjustable combustor 21 after passing through the gas flow regulating valve 13, the gas is ejected through the adjustable combustion nozzles 2114 matched with the combustion cylinder 18 in a grading manner, at the moment, the comprehensive control system sends a control signal to the fresh air flow regulating actuator 19, the fresh air flow regulating valve is driven to regulate the valve position of the regulating valve to an ignition set position and feed the valve position signal back to the comprehensive control system, the valve position feedback precision reaches 0.001, the fresh air enters the combustion cylinder 18 after passing through the regulating valve, is guided by the air box 20 and rectified by the fairing 217, is distributed by the special structural design adjustable flame stabilizing disc 2113, is mixed with the gas ejected by the adjustable gas nozzles 2114 in the tangential direction of the adjustable flame stabilizing disc 13, is further mixed through the special design closing of the combustion cylinder 18, and the mixed gas is ignited by the.
The specific structure of the combustion cylinder 18 is shown in fig. 3, the diameter, the length and the front end closing angle of the combustion cylinder have significant influence on the combustion efficiency and the emission of nitrogen oxides, and the values are verified through theoretical calculation and a large number of tests, so that the condition that the combustion assisting gas pipe moves to the foremost end in the axial direction and is parallel to the starting end face of the combustion cylinder closing 181 is optimal, and the closing angle is 55 degrees, which is the optimal value.
The structure of the flame stabilizing plate 2113 in fig. 2 is shown in fig. 4, circular holes with the same diameter are distributed on the flame stabilizing plate, and combustion-supporting air is blown by high-pressure combustion-supporting air, and the high-pressure combustion-supporting air and the gas sprayed from the auxiliary gas spraying holes form local jet flow and are mixed to form a plurality of dispersed flames for stable combustion. 10 notches are evenly distributed at the edge of the flame stabilizing disc 3113 and are combustion-supporting air overflow ports, combustion-supporting air and fuel gas sprayed from the main fuel gas spray holes form jet flow mixing through the overflow ports,
wherein, the integrated controller 16 detects a stable flame signal through the photoelectric sensor 212, senses the success of ignition, and closes the ignition solenoid valve and the ignition transformer.
After the ignition is successful, the process of turning the fire is started, the integrated controller 16 respectively sends control signals to the fresh air flow regulating actuator 19 and the gas flow regulator, the fresh air flow regulating valve and the gas flow regulating valve 13 are regulated to set valve positions, feedback signals are fed back to the integrated controller 16, the integrated controller 16 confirms the combustion state through photoelectric signals, and the combustion stability integrated controller 16 judges that the fire is successful and enters a stable combustion state. In the process, abnormal signals such as signal flame, wind pressure, actuator feedback and the like occur, the integrated controller 16 shuts down the double-valve-body combined cut-off pressure regulating valve 10, gives an audible and visual alarm, and displays the alarm content so as to be convenient for overhaul and investigation.
The fresh air flow regulating valve and the gas flow regulating valve 13 are adjusted through the discharged smoke component detection data to find the proper ratio of combustion-supporting air and gas, then the integrated controller 16 sends signals to a smoke flow regulating actuator 24 which drives the smoke flow regulating valve 23 to a set valve position, smoke generated by combustion enters an air blower air inlet silencing cover 22 through a smoke valve, an external smoke circulating pipe 26 and the smoke flow regulating valve 23 and enters a combustion-supporting air blower 17, the smoke enters an air box 20 through the fresh air flow regulating valve after being pressurized and enters a combustion cylinder 18 through a fairing 217 to be fully mixed, the combustion-supporting air with reduced oxygen content is mixed with the gas through a flame stabilizing disc 13 to carry out low-nitrogen combustion, and the ratio of the combustion-supporting air, the gas and the external circulation gas can be set through a human-computer interaction system touch screen of the integrated control system, so that the stepless ratio regulation is ensured, and the regulation.
Meanwhile, according to the emission data, the adjusting knob of the multi-element adjustable burner 21 is adjusted to drive the pilot burner combustion head 2116 to move through a pull rod to adjust the relative position of the pilot burner combustion head 2116 in the combustion cylinder 18, the relative position of the pilot burner combustion head 2116 has obvious influence on the combustion production of nitric oxide, carbon monoxide and combustion stability, the closing design of the flame stabilizing disc 2113 and the combustion cylinder 18 also has obvious influence on the combustion emission production of nitric oxide, carbon monoxide and combustion stability, the structures and the arrangement forms of the pilot burner combustion head 2116 and the gas nozzle 2114 and the arrangement form and the relative position of the flame stabilizing disc 2113 have obvious influence on the combustion production of nitric oxide, carbon monoxide and combustion stability, the relative position of the pilot burner combustion head 2116, the structure of the flame stabilizing disc, the closing of the combustion cylinder and the flame stabilizing disc and the arrangement and design of the nitrogen oxide and the like ensure that the emission of equipment and the carbon monoxide is below 30mg/Nm, and combustion stability is maintained.
The multi-element adjustable diffusion combustion device comprises a main gas pipe 219, one end of the main gas pipe 219 is connected with an adjustable flame stabilizing disc 2113 through a multi-element adjustable combustion head 2115, and the adjustable flame stabilizing disc 2113 and the multi-element adjustable combustion head 2115 can move relatively to enable the two to be kept connected but the overall length of the two to be changed; an adjusting plate is arranged on the adjustable flame stabilizing plate 2113, a plurality of position adjusting fixing holes 2112A are formed in different positions of the adjusting plate, and the multi-element adjustable combustion head 2115 can be fixed with the adjusting fixing holes 2112A in different positions through bolts. The other end of the main gas pipe 219 is connected with a fixing plate, the fixing plate is connected with an annular fairing 217, a plurality of combustion-supporting air spray holes 2113A are formed in the adjustable flame stabilizing disc 2113 along the radius direction, and a plurality of surplus air volume overflow ports 2113B are formed in the adjustable flame stabilizing disc 2113 at intervals in the circumferential direction; each surplus air flow overflow port 2113B is correspondingly provided with an adjustable gas nozzle 2114; the fixing plate is provided with a pilot gun gas interface 215 and a high-pressure igniter interface 216, one end of the pilot gun is connected with the pilot gun gas interface 215, the other end of the pilot gun is connected with a pilot gun combustion head 2116, and the pilot gun combustion head 2116 is connected with the high-pressure igniter interface 216 through a wire; one end of the combustion head adjusting pull rod 218 is connected with the outer wall of the multi-element adjustable combustion head 2115 through a multi-element adjustable combustion head fixing frame 2110, the other end of the combustion head adjusting pull rod 218 is connected with a combustion head position adjuster 213 on the fixing plate, and the combustion head position adjuster 213 rotates to enable the fixing plate to axially move along the main gas pipe 219 so as to drive the multi-element adjustable combustion head 2115 and the adjustable flame stabilizing disc 2113 to move; the multi-element adjustable combustion head 2115 is also provided with a central air supplement port 2111, and the fixing plate is also provided with a photoelectric sensor 212 and a flame observation hole 214.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (11)
1. A tangential diffusion coupling flue gas extrinsic cycle multi-element adjustable low-nitrogen combustion equipment is characterized in that: the system comprises a gas regulation and control system, a fresh air regulation and control system, a flue gas recovery regulation and control system, a priming device, a multi-element adjustable diffusion combustion device and a comprehensive control system;
the fuel gas regulation and control system provides fuel gas for the multi-element adjustable diffusion combustion device, the fresh air regulation and control system provides combustion-supporting air for the multi-element adjustable diffusion combustion device, and the flue gas recovery regulation and control system feeds flue gas generated by combustion of the fuel gas of the multi-element adjustable diffusion combustion device back to the multi-element adjustable diffusion combustion device through the fresh air regulation and control system to regulate the nitrogen content of the flue gas; the comprehensive control system accurately controls each system and the multielement adjustable diffusion combustion device, and the coupling boiler intelligently regulates and controls output power to match with energy use change of a user side.
2. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 1, wherein: the gas regulation and control system comprises a manual cut-off ball valve, a filter, a primary gas direct-reading pressure meter, a gas overpressure detection sensor, a double-valve-body combined cut-off pressure regulating valve, an emergency cut-off actuator, a cut-off pressure regulating actuator, a gas leakage detection sensor, a gas low-pressure detection sensor, a secondary gas pressure direct-reading pressure meter, a gas flow regulating valve, a gas flow regulating actuator, a fire-leading pressure reducing valve and a fire-leading electromagnetic valve, and the components realize the full-proportion regulation of the gas safety monitoring and the full flow.
3. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in any one of claims 1-2, wherein: the fresh air regulation and control system comprises a fresh air flow regulating valve, a fresh air flow regulating actuator, an air blower, an air box, a wind pressure sensor and a combustion cylinder, and the parts realize the proportion regulation of the full flow of the fresh air system.
4. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 3, wherein: the diameter, the length and the front end closing angle of the combustion cylinder have obvious influence on combustion efficiency and nitrogen oxide emission, and the values are verified through theoretical calculation and a large number of tests, so that the condition that the combustion assisting gas pipe moves axially to the foremost end and is parallel to the starting end face of the closing of the combustion cylinder is best, and the closing angle is 55 degrees and is the best value.
5. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as recited in any one of claims 1-4, wherein: the flue gas recovery regulation and control system comprises a flue gas recovery pipe, a flue gas flow regulating valve, a flue gas flow regulating actuator, a flue gas temperature sensor and a flue gas fresh air mixer, and the components are used for realizing the proportion regulation of the full flow of the flue gas recovery regulation and control system.
6. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in any one of claims 1 to 7, wherein: the multiple adjustable dispersion combustion device comprises a combustion cylinder, an optical sensor, a high-frequency ignition transformer, an igniter, an ignition gun, a combustion-supporting air fairing, a central air supplementing device, a combustion head regulator, an adjustable combustion head, an adjustable stable flame disc and a replaceable gas nozzle, and realizes effective mixing of combustion-supporting air and gas, reaction intensity of diffusion combustion is guaranteed to reduce thermal nitrogen oxides through multiple regulation, the emission is guaranteed to be below 30mg/Nm for labor, the sufficiency and stability of combustion are guaranteed, and the emission of carbon monoxide is guaranteed to be below 30mg/Nm for labor.
7. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 6, wherein:
the multi-element adjustable dispersive combustion device can adjust the axial movement of the combustion head through the combustion head adjuster and adjust the generation of thermal nitrogen oxide by adjusting the temperature of a combustion core area through the reduction of the flame diameter and the flame length under the coupling action of the combustion head and the combustion cylinder closing-in;
or the multi-element adjustable dispersive combustion device adjusts the mixing of combustion-supporting air and fuel gas or flue gas, combustion-supporting air and fuel gas by adjusting the adjustable flame-stabilizing disc to move axially along the main fuel gas pipe, so as to ensure the uniformity of the mixing;
or, the adjustable dispersed combustion device of many units adjusts combustion head axial displacement and adjustable steady flame dish through the combustion head regulator and adjusts through flame diameter, flame length and the regulation of mixing homogeneity linkage along main gas pipe axial displacement and guarantee that nitrogen oxide and carbon monoxide discharge all reduce to below 30 mg/Nm.
8. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 1, wherein:
the comprehensive control system can detect, alarm and display ultrahigh gas pressure, ultralow gas pressure, gas leakage and abnormal gas pressure through the gas regulation and control system, and controls the multielement adjustable dispersed combustion device according to the alarm condition;
or/and the comprehensive control system can regulate and stabilize the pressure in a certain unit of the gas inlet pressure through the gas regulating and controlling system so as to ensure the stability and output of combustion;
or/and the comprehensive control system senses the operation parameters of each sensor, immediately cuts off the gas emergency cut-off actuator when the operation safety state is threatened, and cuts off the gas supply to ensure safety.
9. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 6, wherein:
the gas flow regulating valve of the gas regulating and controlling system ensures the linearity of flow regulation by using a special-shaped design, the regulating precision of a gas flow regulating actuator reaches 0.001, and the linearity and the regulating precision of gas flow change are ensured;
or/and the adjustment precision of a flow adjustment actuator of the fresh air regulation and control system reaches 0.001, so that the linearity of the change of the gas flow is ensured;
or/and the flue gas flow regulating actuator of the flue gas recovery regulating and controlling system has the regulating precision of 0.001, so that the linearity of the change of the gas flow is ensured.
10. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 7, wherein:
the comprehensive control system comprehensively controls the combustion state to match with the user output through the furnace body sensor, the combustion device sensor and the environment temperature sensor, carries out automatic compensation and safety detection according to the program,
or/and the comprehensive control system carries out remote communication through a communication module;
or/and the integrated control system has the following extended functions: the system comprises an Internet of things module, a plurality of joint control modules and a climate compensation module.
11. The tangential diffusion coupled flue gas external circulation multi-element adjustable low-nitrogen combustion device as claimed in claim 7, wherein:
the multi-element adjustable diffusion combustion device comprises a main gas pipe (219), one end of the main gas pipe (219) is connected with an adjustable flame stabilizing disc (2113) through a multi-element adjustable combustion head (2115), and the adjustable flame stabilizing disc (2113) and the multi-element adjustable combustion head (2115) can move relatively to enable the two to be kept connected but the overall length of the two to be changed; an adjusting plate is arranged on the adjustable flame stabilizing disc (2113), a plurality of position adjusting fixing holes (2112A) are formed in different positions of the adjusting plate, and the multi-element adjustable combustion head (2115) can be fixed with the adjusting fixing holes (2112A) in different positions through bolts; the other end of the main gas pipe (219) is connected with a fixing plate, an annular fairing (217) is connected onto the fixing plate, a plurality of combustion-supporting air spray holes (2113A) are formed in the adjustable flame stabilizing disc (2113) along the radius direction, and a plurality of surplus air overflow ports (2113B) are formed in the adjustable flame stabilizing disc (2113) in the circumferential direction at intervals; each surplus air volume overflow opening (2113B) is correspondingly provided with an adjustable gas nozzle (2114); the fixed plate is provided with a pilot gun gas interface (215) and a high-pressure igniter interface (216), one end of the pilot gun is connected with the pilot gun gas interface (215), the other end of the pilot gun is connected with a pilot gun combustion head (2116), and the pilot gun combustion head (2116) is connected with the high-pressure igniter interface (216) through a lead; one end of a combustion head adjusting pull rod (218) is connected with the outer wall of the multi-element adjustable combustion head (2115) through a multi-element adjustable combustion head fixing frame (2110), the other end of the combustion head adjusting pull rod (218) is connected with a combustion head position adjuster (213) on the fixing plate, and the combustion head position adjuster (213) rotates to enable the fixing plate to move axially along the main gas pipe (219) so as to drive the multi-element adjustable combustion head (2115) and the adjustable flame stabilizing disc (2113) to move; the multi-element adjustable combustion head (2115) is further provided with a central air supplement port (2111), and the fixing plate is further provided with a photoelectric sensor (212) and a flame observation hole (214).
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