CN113048460A - Adopt ultralow nitrogen emission boiler of E type combustor - Google Patents

Adopt ultralow nitrogen emission boiler of E type combustor Download PDF

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Publication number
CN113048460A
CN113048460A CN202110433250.4A CN202110433250A CN113048460A CN 113048460 A CN113048460 A CN 113048460A CN 202110433250 A CN202110433250 A CN 202110433250A CN 113048460 A CN113048460 A CN 113048460A
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China
Prior art keywords
boiler
conveying pipeline
phase conveying
water spray
flue gas
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CN202110433250.4A
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Chinese (zh)
Inventor
唐宏
韩晓菊
刘玉秋
沈学强
王思源
刘坐东
姜文娟
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Northeast Electric Power University
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Northeast Dianli University
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Priority to CN202110433250.4A priority Critical patent/CN113048460A/en
Publication of CN113048460A publication Critical patent/CN113048460A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • 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
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D1/00—Devices using naturally cold air or cold water
    • F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)

Abstract

The invention relates to an ultra-low nitrogen emission boiler adopting an E-type burner, which comprises: the powder feeding device, the boiler hearth, the E-shaped burner, the igniter and the water spraying desuperheater are arranged outside the hearth, the coal powder is pretreated, the ultralow emission of nitrogen oxides is realized, after combustion products enter the hearth according to different gas-solid component distribution ratios, the secondary removal of the nitrogen oxides can be realized through reduction combustion and the reasonable configuration of secondary air and over-fire air, and the problem that the existing coal-fired boiler is difficult to realize NO is solvedxThe technical dilemma of ultra-low emission can meet different coal types, and is stable, reliable and safe under different working conditionsThe coal-fired generator set has the advantages of full work and strong applicability, can reduce the pollution of the coal-fired generator set to the environment, and realizes the clean and efficient utilization of coal.

Description

Adopt ultralow nitrogen emission boiler of E type combustor
Technical Field
The invention relates to a coal-fired generator set, in particular to an ultra-low nitrogen emission boiler adopting an E-type combustor.
Background
Because the coal-fired generating set has the characteristics of high safety, high stability, easy control and the like, the coal-fired generating set is still an important component of the power generation industry for a long time in the future. The pollutant emission of coal-fired power generating units in the combustion process is still the focus of current attention, especially how to realize NOxIs particularly a hot spot problem therein. The prior art can effectively reduce NO by adopting a low-nitrogen burner and correspondingly adjusting the operation measures of a boilerxThe emission concentration of (2), but the low-nitrogen burner adopted by the coal-fired unit is difficult to realize NOxThe ultra-low emission of the fuel is realized by adopting post-treatment measures such as flue gas denitration and the like to control NOxThe emission causes great challenges to the safe and economic operation of the generating set and is accompanied by the problem of secondary pollution.
Disclosure of Invention
The invention discloses an ultra-low nitrogen emission boiler adopting an E-shaped burner, aiming at the technical problems in the prior art, the ultra-low nitrogen emission boiler can be used for preprocessing pulverized coal through the E-shaped burner to realize the ultra-low emission of nitrogen oxides, the aim of greatly reducing the emission of the nitrogen oxides of a coal-fired generator set is fulfilled, and the clean and efficient utilization of fuel is realized.
The technical scheme adopted for realizing the invention is as follows: an ultra-low nitrogen emission boiler using an E-type burner, comprising: some firearm 1, boiler furnace 7, air heater 11, give powder device 13, fan 15, bellows 16, wind power dynamic control valve 17 once, characterized by, it still includes: the E-shaped combustor 2, the water spray desuperheater 3, the water spray desuperheater electric regulating valve 24 and the water spray desuperheating water pump 25, wherein the E-shaped combustor 2 comprises: an inlet pipeline 28, an E-shaped burner body 27, a concentrated phase conveying pipeline 4, an intermediate concentrated phase conveying pipeline 5 and a dilute phase conveying pipeline 6, wherein a combustion chamber is arranged in the E-shaped burner body 27, the concentrated phase conveying pipeline 4, the intermediate concentrated phase conveying pipeline 5 and the dilute phase conveying pipeline 6 are sequentially arranged on one side of the E-shaped burner body 27 from bottom to top and are hermetically communicated with the combustion chamber, the inlet pipeline 28 is arranged on the other side of the E-shaped burner body 27 and is hermetically communicated with the combustion chamber, the inlet pipeline 28 of the E-shaped burner 2 is hermetically communicated with a powder feeding device 13, the concentrated phase conveying pipeline 4, the intermediate concentrated phase conveying pipeline 5 and the dilute phase conveying pipeline 6 of the E-shaped burner 2 are sequentially hermetically communicated with a boiler hearth 7 from bottom to top, a secondary boiler tuyere a8 is arranged at the upper end of the connection part of the boiler hearth 7 and the dilute phase conveying pipeline 6, the lower end of the joint of the boiler furnace 7 and the dense phase conveying pipeline 4 is provided with a boiler secondary air port b9 on the boiler furnace 7, an igniter 1 is arranged in an inlet pipeline 28 of the E-shaped combustor 2, a water spray desuperheater 3 is arranged in a combustion chamber between the inlet pipeline 28 of the E-shaped combustor 2 and the dilute phase conveying pipeline 6, a water spray desuperheater electric regulating valve 24 is communicated with the water spray desuperheater 3, and the water spray desuperheater electric regulating valve 24 is communicated with a water spray desuperheating water pump 25.
Further, it also includes: afterbody drainage flue gas electrical control valve 12 and flue gas recirculation fan 26, flue gas recirculation fan 26 pass through air heater flue gas drainage pipeline 14 and the airtight intercommunication of bellows 16, flue gas recirculation fan 26 and air heater export 20 intercommunication flue gas recirculation fan 26 and 16 between air heater flue gas drainage pipeline 14 on set up afterbody drainage flue gas electrical control valve 12.
Further, the inlet pipe 28 of the E-shaped burner 2 is eccentrically communicated with the E-shaped burner body 27.
The beneficial technical effects of the ultra-low nitrogen emission boiler adopting the E-shaped burner are as follows:
1. an ultra-low nitrogen emission boiler adopting an E-shaped burner is characterized in that the E-shaped burner is arranged outside a hearth, so that pulverized coal is incompletely combusted to generate a large amount of reducing gas and generate the first removal of nitrogen oxides, combustion products enter the hearth according to different gas-solid component ratios,through reduction combustion and reasonable configuration of secondary air and over-fire air, secondary removal of nitrogen oxides can be realized, and NO is realizedxUltra-low emission of (2);
2. an ultra-low nitrogen emission boiler adopting an E-shaped burner breaks through the difficulty in realizing NO in the existing coal-fired boilerxThe ultra-low emission technology dilemma can meet the requirements of different coal types and different output forces, and can work stably, reliably and safely under different working conditions, thereby being an ultra-low nitrogen emission boiler with practical application value;
3. the ultra-low nitrogen emission boiler adopting the E-type combustor is scientific and reasonable, has strong applicability and good effect, can reduce the pollution of a coal-fired power generation unit to the environment, and realizes the clean and efficient utilization of coal.
Drawings
FIG. 1 is a schematic view of an ultra-low nitrogen emission boiler employing an E-type burner;
FIG. 2 is a schematic view of an E-type burner configuration;
FIG. 3 is a schematic diagram showing the arrangement of thermocouples in a pretreatment device of an ultra-low nitrogen emission boiler using an E-type burner;
FIG. 4 is a schematic diagram of a temperature control system for an ultra-low nitrogen emissions boiler pretreatment unit using an E-burner;
in the figure: 1. igniter, 2, E type burner, 3, water spray desuperheater, 4, dense phase conveying pipeline, 5, middle dense phase conveying pipeline, 6, dilute phase conveying pipeline, 7, boiler furnace, 8, boiler secondary air inlet a, 9, boiler secondary air inlet b, 10, boiler furnace bottom, 11, air preheater, 12, tail-end-drainage smoke electric regulating valve, 13, powder feeding device, 14, air preheater smoke drainage pipeline, 15, fan, 16, air box, 17, primary wind electric regulating valve, 18, air box outlet pipeline, 19, air preheater inlet part, 20, air preheater outlet, 21, main combustion zone, 22, reduction zone, 23, burnout zone, 24, water spray desuperheating electric regulating valve, 25, water spray desuperheating water pump, 26, smoke recirculation fan, 27, E type burner body, 28, inlet pipeline, 29, first thermocouple, 30, second thermocouple, 31. the thermocouple system comprises a third thermocouple, 32, a fourth thermocouple, 33, a fifth thermocouple, 34, a sixth thermocouple, 35, a seventh thermocouple, 36, an eighth thermocouple, 37, a ninth thermocouple, 38, a tenth thermocouple, 39, a first proportional-derivative controller, 40, a second proportional-derivative controller, 41 and a third proportional-derivative controller.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, which are described herein for illustrative purposes only and are not intended to be limiting.
Referring to fig. 1 to 2, an ultra-low nitrogen emission boiler using an E-type burner, includes: some firearm 1, E type combustor 2, water spray desuperheater 3, boiler furnace 7, air heater 11, afterbody drainage flue gas electrical control valve 12, give powder device 13, air heater flue gas drainage pipeline 14, fan 15, bellows 16, wind box 17, wind box outlet pipe 18, air heater import part 19, air heater export 20, water spray desuperheating electrical control valve 24, water spray desuperheating water pump 25, flue gas recirculation fan 26, E type combustor 2 include: an inlet pipeline 28, an E-shaped burner body 27, a concentrated phase conveying pipeline 4, an intermediate concentrated phase conveying pipeline 5 and a dilute phase conveying pipeline 6, wherein a combustion chamber is arranged in the E-shaped burner body 27, the concentrated phase conveying pipeline 4, the intermediate concentrated phase conveying pipeline 5 and the dilute phase conveying pipeline 6 are sequentially arranged on one side of the E-shaped burner body 27 from bottom to top and are communicated with the combustion chamber, the inlet pipeline 28 is arranged on the other side of the E-shaped burner body 27 and is eccentrically communicated with the combustion chamber, the inlet pipeline 28 of the E-shaped burner 2 is hermetically communicated with a powder feeding device 13, the concentrated phase conveying pipeline 4, the intermediate concentrated phase conveying pipeline 5 and the dilute phase conveying pipeline 6 of the E-shaped burner 2 are sequentially communicated with a boiler hearth 7 from bottom to top, a boiler secondary air port a8 is arranged at the upper end of the communication part of the boiler hearth 7 and the dilute phase conveying pipeline 6, a boiler secondary air port b9 is arranged at the lower end of the communication part of the boiler hearth 7 and the concentrated phase conveying pipeline 4, an igniter 1 is arranged in an inlet pipeline 28 of the E-shaped combustor 2, a water spray desuperheater 3 is arranged in a combustion chamber between the inlet pipeline 28 of the E-shaped combustor 2 and the dilute phase conveying pipeline 6, an electric water spray desuperheater 24 is communicated with the water spray desuperheater 3, and the electric water spray desuperheater 24 is communicated with a water spray desuperheating water pump 25.
The working principle of the ultra-low nitrogen emission boiler adopting the E-type burner is as follows:
when the boiler operates, primary air carrying coal powder is ignited at the igniter 1 and then sent to the E-shaped combustor 2, and heat generated by combustion of the coal powder is used for pyrolysis of the coal powder and maintaining high-temperature thermodynamic balance (900-; because the combustion is carried out under the condition of oxygen deficiency and water content, the pulverized coal combustion can generate a large amount of reducing gases such as carbon monoxide, hydrogen, methane and the like; the reducing gas reacts with the nitrogen oxide generated by the combustion of the volatile matter at high temperature to reduce the nitrogen oxide, so that the nitrogen oxide is greatly removed for the first time; in order to realize the separation of combustion products, an inlet pipeline 28 of the E-shaped combustor 2 and an E-shaped combustor body 27 are arranged in an eccentric connection mode, so that pulverized coal airflow generates a rotational flow to promote gas-solid separation; most of the air-powder mixture (mainly coal powder) enters a concentrated phase conveying pipeline 4 and then is sent into a main combustion area 21; wherein, a part of the air-powder mixture (the coal powder accounts for a little higher) is sent into the main combustion zone 21 through the middle concentrated phase conveying pipe 5, part of the reducing gas enters the reducing zone 22 due to the action of gravity, and the rest solid coal powder falls into the main combustion zone 21 for full combustion; the rest wind-powder mixture (mainly reducing gas) enters the dilute phase conveying pipeline 6 and then is conveyed into the reducing zone 22. The fuel in the main combustion zone 21 is mixed with the secondary air and then continuously combusted, the excess air coefficient of the main combustion zone 21 is controlled to be still less than 1, and the flue gas generated by combustion flows through the reduction zone 22 to be mixed with the reducing gas generated by pyrolysis, so that the secondary reduction of the nitrogen oxide is realized. Because the main burning zone 21 and the reduction zone 22 are always in an oxygen-deficient burning state, in order to reduce incomplete burning loss, a burnout zone 23 is arranged above the reduction zone, and air is supplied through an over-fire air channel, so that the excess air coefficient of the burnout zone 23 is larger than 1, and the burnout of coal is ensured. When the carbon content of nitrogen oxide or fly ash at the outlet of the hearth is too high, the reduction reaction and the combustion efficiency can be ensured by adjusting the proportion of secondary air and over-fire air, the clean and efficient utilization of coal is realized, and the safe and controllable operation of the E-shaped combustor 2 is ensured by arranging the water spray desuperheater 3 and the flue gas recirculation in order to solve the over-temperature problem.
Referring to fig. 3, thermocouples are installed in the combustion chamber of the E-type combustor 2 to measure the temperature of the pyrolysis products in the combustion chamber, the combustion chamber is divided into three regions, the combustion chamber is uniformly divided into two regions according to the height, a first region with the height is arranged on the body of the E-type combustor between the middle dense-phase conveying pipeline 5 and the dilute-phase conveying pipeline 6, and a first thermocouple 29, a second thermocouple 30, a third thermocouple 31 and a fourth thermocouple 32 are uniformly installed; a second high area is arranged on the E-shaped burner body between the concentrated phase conveying pipeline 4 and the middle concentrated phase conveying pipeline 5, and a fifth thermocouple 33, a sixth thermocouple 34, a seventh thermocouple 35 and an eighth thermocouple 36 are uniformly arranged. Two thermocouples, namely a ninth thermocouple 37 and a tenth thermocouple 38 are uniformly installed on the concentrated phase conveying pipeline 4 which is provided with a transverse section.
Referring to fig. 4, the E-burner combustor operating temperature set point S1, the E-burner triggers a safety temperature set point S2 at which the water spray attemperation valve opens. The real-time temperature mean value P1 of the combustion chamber of the E-type combustor is the mean value of the measured values of the thermocouples 29-38.
1. The temperature inside the combustion chamber of the E-type combustor 2 is controlled by a PID controller, so that the average temperature of the operation process is kept between certain temperatures for stable operation. Temperature control has 3 means to choose:
the difference value E1 between the real-time temperature mean value P1 of the combustion chamber of the E-shaped combustor 2 and the operation temperature set value S1 is P1-S1, and the difference value E1 is used as the input of a first proportional integral controller 39, the opening degree of a primary wind power dynamic adjusting valve 17 is adjusted, the wind quantity of a primary fan 15 is controlled, the excess air coefficient in the combustion chamber of the E-shaped combustor 2 is changed, and the reaction intensity is adjusted to control the internal temperature of the combustion chamber of the E-shaped combustor 2;
and the difference E1 between the real-time temperature mean value P1 of the combustion chamber of the E-shaped combustor 2 and the operation temperature set value S1 is P1-S1 and is used as the input of the second proportional-integral controller 40 to adjust the opening of the tail-drainage flue gas electric adjusting valve 12 and control the amount of the recirculated flue gas of the flue gas recirculation fan 26. The temperature inside the combustion chamber of the E-shaped combustor 2 is reduced through convection heat exchange; and adjusting the reaction intensity to control the internal temperature of the combustion chamber of the E-shaped burner 2 by changing the internal oxygen concentration of the burner;
and thirdly, the difference E1 between the real-time temperature mean value P1 of the combustion chamber of the E-type combustor 2 and the operation temperature set value S1 is P1-S1 and is used as the input of the third proportional-integral controller 40 to adjust the opening of the water spraying temperature reduction electric regulating valve 24 and control the flow of the temperature reduction water of the water spraying temperature reduction water pump 25. Atomized cooling water is sprayed into the E-shaped combustor 2 through the water spray desuperheater 3 arranged at the top of the E-shaped combustor 2, is evaporated into water vapor and is well mixed with pyrolysis products in the combustion chamber of the E-shaped combustor 2, and the internal temperature of the combustion chamber of the E-shaped combustor 2 is reduced.
2. The safe temperature of the combustion chamber of the E-type combustor is controlled by a threshold value. When the real-time temperature mean value P1 of the combustion chamber of the E-shaped combustor 2 exceeds the safe temperature set value S2 for opening the water spray attemperator, the water spray attemperator electric regulating valve 24 is triggered to regulate the set accident large flow opening, and the water spray attemperator 3 arranged at the top of the E-shaped combustor 2 sprays a large amount of atomized cooling water into the combustion chamber, so that the combustion chamber is rapidly cooled, and the temperature of the E-shaped combustor 2 is prevented from exceeding the allowable range.
The temperature control technology of the ultra-low nitrogen emission boiler adopting the E-type combustor is the prior art.
Example 1:
the ultralow nitrogen that this embodiment adopted E type combustor discharges the boiler, and wherein, the boiler combustion mode is four corners tangential circle, and turbonator rated power 300 MW.
Firstly, referring to the attached figure 1, constructing an ultra-low nitrogen emission boiler adopting an E-shaped combustor 2, wherein the vertical height of the E-shaped combustor 2 is 9m, the diameter of the E-shaped combustor 2 is 1.2m, and the average temperature of the E-shaped combustor 2 is used as the temperature control quantity of the E-shaped combustor;
secondly, referring to fig. 3, installing a thermocouple outside the E-shaped combustor 2, dividing the thermocouple into three regions, uniformly dividing the regions into two regions according to the height, setting a first region with a height on the body of the E-shaped combustor between the middle concentrated phase conveying pipeline 5 and the dilute phase conveying pipeline 6, and uniformly installing a first thermocouple 29, a second thermocouple 30, a third thermocouple 31 and a fourth thermocouple 32; a second high area is arranged on the E-shaped burner body between the concentrated phase conveying pipeline 4 and the middle concentrated phase conveying pipeline 5, and a fifth thermocouple 33, a sixth thermocouple 34, a seventh thermocouple 35 and an eighth thermocouple 36 are uniformly arranged. A transverse section is arranged on the concentrated phase conveying pipeline 4, and two thermocouples, namely a ninth thermocouple 37 and a tenth thermocouple 38, are uniformly installed;
in the third step, the given operating temperature of the type E burner 2 was 950 ℃. The control mode selects one or more of the first proportional-integral controller, the second proportional-integral controller and the third proportional-integral controller. The three controllers adopt the difference value between the given operation temperature and the average value of the temperatures measured by 10 thermocouples as the input of a proportional-integral link. When the temperature of the combustion chamber is controlled by adopting a first proportional integral control mode, the output of a proportional integral link is used as a control quantity to control the opening degree of the primary wind electric control valve 17, so that the adjustment of primary wind flow is realized; when the temperature of the combustion chamber is controlled by adopting a second proportional-integral control mode, the output of a proportional-integral link is used as a control quantity to control the opening of the tail-part drainage flue gas electric regulating valve 12, so that the tail-part flue gas drainage flow is regulated; when the temperature of the combustion chamber is controlled by adopting a third proportional-integral control mode, the output of the proportional-integral link is used as a control quantity to control the opening degree of the water spraying temperature reduction electric regulating valve 24, so that the regulation of the flow of atomized cooling water is realized.
Fourthly, the water spray desuperheater 3 of the E-shaped combustor 2 gives a safety critical temperature of 1200 ℃, the difference value between the given safety critical temperature and the average value of the temperatures measured by 10 thermocouples is less than or equal to zero, the opening degree of the water spray desuperheater is controlled to be the set accident large flow opening degree, and the rapid cooling of the combustion chamber is realized;
fifthly, when the boiler unit is started, the E-shaped burner 2 is started to operate, and the pulverized coal enters the combustion chamber under the action of primary air and is ignited by the igniter 1; when the E-shaped combustor 2 reaches a certain output, namely the sprayed primary air powder realizes self-sustaining reaction, the igniter 1 stops working; an inlet pipeline 28 of the E-type igniter 2 and an E-type igniter body 27 are arranged in an eccentric connection mode, so that pulverized coal airflow generates rotational flow to promote gas-solid separation, most of the air-powder mixture (pulverized coal is taken as the main part) is sent into the main combustion area through a concentrated phase conveying pipeline 4, a small part of the air-powder mixture is sent into the main combustion area 21 through an intermediate concentrated phase conveying pipeline 5, the rest of the air-powder mixture (reducing gas is taken as the main part) enters the reduction area 22 through a dilute phase conveying pipeline 6, and in order to reduce incomplete combustion loss, a burnout area 23 is arranged above the reduction area, so that burnout of the pulverized coal is ensured;
finally, pulverized coal is blown into the furnace, ignited and combusted, pyrolyzed by an E-shaped combustor, separated from gas and solid, combusted in a main combustion area, combusted in a reduction area and combusted in a burnout area to form the whole process of pulverized coal combustion; wherein E-type burner 2 accomplishes the pair NOxThe first reduction of (a); the NO is burnt in the hearth through three stages of the main burning zone 21, the reduction zone 22 and the burnout zone 23xBy secondary reduction of NOxThe emission is greatly reduced; effectively reduces the emission of coal combustion pollutants to a certain extent and improves the clean utilization efficiency of coal.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and these should be considered as the protection scope of the present invention.

Claims (3)

1. An ultra-low nitrogen emission boiler using an E-type burner, comprising: some firearm (1), boiler furnace (7), air heater (11), give powder device (13), fan (15), bellows (16), wind electrical control valve (17), characterized by, it still includes: e type combustor (2), water spray desuperheater (3), water spray desuperheater electrical control valve (24), water spray desuperheating water pump (25), E type combustor (2) include: an inlet pipeline (28), an E-shaped burner body (27), a concentrated phase conveying pipeline (4), a middle concentrated phase conveying pipeline (5) and a dilute phase conveying pipeline (6), wherein a combustion chamber is arranged in the E-shaped burner body (27), the concentrated phase conveying pipeline (4), the middle concentrated phase conveying pipeline (5) and the dilute phase conveying pipeline (6) are sequentially arranged on one side of the E-shaped burner body (27) from bottom to top and are hermetically communicated with the combustion chamber, an inlet pipeline (28) is arranged on the other side of the E-shaped burner body (27) and is hermetically communicated with the combustion chamber, the inlet pipeline (28) of the E-shaped burner (2) is hermetically communicated with a powder feeding device (13), the concentrated phase conveying pipeline (4), the middle concentrated phase conveying pipeline (5) and the dilute phase conveying pipeline (6) of the E-shaped burner (2) are sequentially and hermetically communicated with a boiler hearth (7) from bottom to top, boiler furnace (7) and dilute phase conveying pipeline (6) junction upper end are equipped with boiler secondary wind gap a (8) on boiler furnace (7) and concentrated phase conveying pipeline (4) junction lower extreme are equipped with boiler secondary wind gap b (9) on boiler furnace (7) be equipped with some firearm (1) in inlet pipeline (28) of E type combustor (2) be equipped with in the combustion chamber between inlet pipeline (28) and dilute phase conveying pipeline (6) of E type combustor (2) water spray desuperheater (3), water spray desuperheater electrical control valve (24) and water spray desuperheater (3) intercommunication, water spray desuperheater electrical control valve (24) and water spray desuperheating water pump (25) intercommunication.
2. The ultra-low nitrogen emissions boiler using the type-E burner as set forth in claim 1, further comprising: afterbody drainage flue gas electrical control valve (12) and flue gas recirculation fan (26), flue gas recirculation fan (26) pass through air heater flue gas drainage pipeline (14) and the airtight intercommunication of bellows (16), flue gas recirculation fan (26) and air heater export (20) intercommunication flue gas recirculation fan (26) and air heater flue gas drainage pipeline (14) between bellows (16) on set up afterbody drainage flue gas electrical control valve (12).
3. The ultra-low nitrogen emissions boiler using E-type burner as set forth in claim 1, wherein the inlet duct (28) of the E-type burner (2) is eccentrically communicated with the E-type burner body (27).
CN202110433250.4A 2021-04-22 2021-04-22 Adopt ultralow nitrogen emission boiler of E type combustor Pending CN113048460A (en)

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