CN109578978B - Environment-friendly coal-fired boiler achieving staged combustion and treatment method thereof - Google Patents

Environment-friendly coal-fired boiler achieving staged combustion and treatment method thereof Download PDF

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Publication number
CN109578978B
CN109578978B CN201811405615.7A CN201811405615A CN109578978B CN 109578978 B CN109578978 B CN 109578978B CN 201811405615 A CN201811405615 A CN 201811405615A CN 109578978 B CN109578978 B CN 109578978B
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China
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partition plate
chamber
coal
fire
longitudinal partition
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CN109578978A (en
Inventor
刘忠攀
谭波
宋令坡
许义
郑元刚
司硕
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Yankuang Technology Co ltd
Shandong Energy Group Co Ltd
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Yankuang Technology Co ltd
Yankuang Group Corp Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B10/00—Combustion apparatus characterised by the combination of two or more combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B90/00—Combustion methods not related to a particular type of apparatus
    • F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B90/00—Combustion methods not related to a particular type of apparatus
    • F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
    • F23B90/06—Combustion methods not related to a particular type of apparatus including secondary combustion the primary combustion being a gasification or pyrolysis in a reductive atmosphere
    • 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 
    • F23L1/02—Passages or apertures for delivering primary air for combustion  by discharging the air below the fire
    • 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 
    • F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air above the fire
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Abstract

The invention provides an environment-friendly coal-fired boiler with staged combustion and a treatment method thereof, wherein the top of a boiler body is provided with a coal feeding port, and the bottom of a hearth is provided with a first longitudinal partition plate which divides the inside of the hearth into a first chamber and a second chamber, the tops of which are communicated; a fire tube is arranged on the upper part in the first chamber on the side of the first longitudinal partition plate, the top of the fire tube is fixed on the first longitudinal partition plate and the furnace top through a partition plate with a hole, the bottom of the fire tube is fixed on the first longitudinal partition plate through the hole partition plate, the unfixed end of the hole partition plate is downwards provided with a second longitudinal partition plate, the lower part of the first chamber is divided into a third chamber and a fourth chamber, the bottoms of the third chamber and the fourth chamber are communicated, an over-fire air inlet is formed in the fourth chamber, a fire grate is arranged at the bottom of the third chamber; a first inclined partition plate is arranged in a space far away from the first longitudinal partition plate in the first chamber. The invention eliminates the existence of oxygen in the dry distillation pyrolysis area through a heat conduction mode, thereby realizing the dry distillation pyrolysis in the real sense, reducing the influence of oxygen on the pyrolysis and effectively reducing the pollutant discharge.

Description

Environment-friendly coal-fired boiler achieving staged combustion and treatment method thereof
Technical Field
The invention belongs to the field of coal combustion equipment, relates to an environment-friendly coal-fired boiler for staged combustion and a treatment method thereof, and particularly relates to an environment-friendly coal-fired boiler for staged combustion improved through heat conduction and a treatment method thereof.
Background
At present, in a coal-fired boiler adopting a staged combustion technology, particularly a coal-fired boiler with a dry distillation pyrolysis zone and a semicoke combustion zone distributed up and down, the dry distillation pyrolysis zone and the semicoke combustion zone are generally arranged in a connection mode without obvious boundaries.
For example, CN 107238111A discloses a coal-fired heating stove, wherein a coal feeding port is arranged on one side of the top of a main body, and a chimney is arranged on the side of the top of the main body opposite to the coal feeding port; a water jacket partition plate is vertically arranged at the upper part in the coal-fired heating furnace main body, and the upper part in the coal-fired heating furnace main body is divided into a pyrolysis gasification zone connected with a coal feeding port and a flue gas burnout heat exchange zone connected with a chimney; the area of the lower part in the coal-fired heating furnace main body, which is not provided with the partition plate, is a semicoke combustion area; the lower part of the semicoke combustion area is obliquely provided with a grate, and a primary air port is arranged below the grate; a secondary air port is arranged in a burnout area at the upper part of the semicoke combustion area; and a heating water heat exchange pipe is arranged in the burnout zone.
For the staged combustion coal-fired boiler in the prior art, air pipes generally arranged in a dry distillation pyrolysis area or air in a semicoke combustion area can flow into the pyrolysis area, so that dry distillation pyrolysis in the true sense can not be realized, but the staged combustion coal-fired boiler is somewhat similar to oxygen-poor combustion and is easy to cause insufficient smoke elimination (black smoke emission), CO and NOxThe emission concentration rapidly increases. Meanwhile, the risk of hearth deflagration is also increased.
Disclosure of Invention
Aims at the problems that the carbonization pyrolysis and the semicoke combustion areas in the existing staged combustion boiler are connected and arranged, so that NO obvious boundary exists, the carbonization pyrolysis can not be realized in the true sense, and the smoke abatement deficiency (black smoke), CO and NO are easily causedxThe invention provides an environment-friendly coal-fired boiler with staged combustion and a treatment method thereof, and solves the problems that the emission concentration is rapidly increased, the deflagration risk of a hearth is high and the like. The invention eliminates the existence of oxygen in the dry distillation pyrolysis area through a heat conduction mode, thereby realizing the dry distillation pyrolysis in the real sense, reducing the influence of oxygen on the pyrolysis and effectively reducing the pollutant discharge.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a staged combustion coal-fired boiler, which comprises a boiler body and a hearth, wherein a coal feeding port is arranged at the top of the boiler body, a first longitudinal partition plate is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
the fire tube is arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the top of the fire tube is fixed on the first longitudinal partition plate and the furnace top through the first perforated partition plate, the bottom of the fire tube is fixed on the first longitudinal partition plate through the second perforated partition plate, one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate is downwards provided with the second longitudinal partition plate, the lower area of the first chamber is divided into two chambers with communicated bottoms, namely a third chamber and a fourth chamber, the fourth chamber is positioned below the fire tube, an over-fire air inlet is arranged in the fourth chamber, the bottom of the third chamber is provided with a fire grate, and a furnace body below the fire grate is provided with an air;
a first inclined clapboard is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal clapboard in the first chamber, the first inclined clapboard inclines towards the lower part of the furnace body, and a space for materials to pass is reserved between the first inclined clapboard and the fire tube;
the second chamber is internally provided with a heat exchange tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
In the present invention, the terms "first", "second", "third", and "fourth", etc. are used merely for the sake of distinction in nomenclature, and do not have any special meaning.
In the invention, the openings of the first perforated partition plate and the second perforated partition plate are matched with the fire tubes and are in sealed connection, so that gas can flow through the fire tubes, and the shell layer part in the fire tube array is used for coal to pass through;
in the present invention, when the first inclined partition is provided at both the upper end and the lower end thereof with downward partitions, it may be fixed by being connected to the sidewall.
In the invention, the space above the first inclined partition plate is a coal storage bin and a pyrolysis and gasification area, the coal storage bin is positioned at the upstream of the pyrolysis and gasification area, the heat required by the pyrolysis and gasification area is directly supplied by a fire tube in a heat conduction mode, so that the dry distillation and pyrolysis in the real sense are realized, and the heat in the fire tube comes from high-temperature flue gas and is combusted by over-fire air.
The area between the lower part of the first inclined partition plate and the fire grate is a semicoke combustion area, the semicoke combustion area adopts a bottom combustion mode, and pyrolysis gas produced in the pyrolysis gasification area flows into the semicoke combustion area from top to bottom under the action of negative pressure in the hearth to react with a semi-corner to be converted into harmless nitrogen.
The fourth chamber below the fire tube is a burnout chamber, so that on one hand, the burnout rate of combustible gas is improved, on the other hand, the combustion temperature of a fire area is improved, and the dry distillation pyrolysis degree is increased.
The heat exchange tube that the inside of second cavity set up can reduce exhaust gas temperature, increases boiler efficiency.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferable technical scheme of the invention, a feeding device is arranged at the coal feeding port to control the feeding amount of the fire coal.
Preferably, the coal feeding port is arranged at the top of the first chamber;
preferably, the coal charging port is arranged on the upper side wall of the second chamber.
In a preferred embodiment of the invention, the number of fire tubes is not less than 2, for example 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, and more, but is not limited to the values listed, and other values not listed in this range of values are equally applicable, preferably 12 to 16.
Preferably, the second partition plate with holes inclines towards the furnace bottom, so that materials borne by the second partition plate with holes can smoothly enter the half-angle combustion area downwards.
Preferably, the second perforated partition is inclined toward the furnace bottom at 60 ° to 70 °, for example, 60 °, 62 °, 64 °, 66 °, 68 ° or 70 ° to the first longitudinal partition, but is not limited to the values listed, and other values not listed in this numerical range are also applicable.
In a preferred embodiment of the present invention, the first inclined partition is inclined toward the lower part of the furnace body at an angle of 20 ° to 30 °, for example, 20 °, 22 °, 24 °, 26 °, 28 °, or 30 ° to the furnace wall, but the first inclined partition is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the first inclined partition top end is fixed to the furnace wall remote from the first longitudinal partition.
Preferably, the lower end of the first inclined partition plate is provided with a third longitudinal partition plate, a space for material circulation is reserved between the third longitudinal partition plate and the fire tube, and the third longitudinal partition plate can guide materials such as semicoke and the like generated in the dry flow pyrolysis process to downwards enter the semi-angle combustion area.
Preferably, a downward fourth longitudinal partition plate is arranged at the upper end of the first inclined partition plate, a space for gas circulation is reserved between the fourth longitudinal partition plate and the furnace wall, so that pyrolysis gas generated in the pyrolysis gasification process can downwards enter a semicoke combustion area through the space, and the possibility of hearth deflagration is further reduced.
As a preferable technical scheme of the invention, when the coal charging port is arranged on the upper side wall of the second chamber, the fire tube is arranged on the upper part of the second chamber, the top of the fire tube is fixed on the first longitudinal partition plate and the furnace top through the third partition plate with holes, the bottom of the fire tube is fixed on the first longitudinal partition plate through the fourth partition plate with holes, and the heat exchange tube in the second chamber is positioned in the space below the fire tube.
Preferably, the length of the fire tube arranged in the second chamber is not more than that of the fire tube arranged in the first chamber, otherwise, materials on the fourth perforated partition plate cannot smoothly move downwards to enter the semicoke combustion zone.
In the invention, the coal hopper is arranged at one side of the second chamber, namely opposite to the coal storage bin, and a pyrolysis and gasification area can be formed between the fire tubes (namely the space outside the tubes), so that the area of the pyrolysis and gasification area is enlarged, the heat exchange area of pyrolysis and dry distillation is increased, and the pyrolysis degree of the fuel is increased.
Preferably, the fourth perforated partition is inclined towards one side of the first longitudinal partition, so that the coal fed from the coal feeding port and the semicoke generated by pyrolysis and gasification can move downwards and enter the semicoke combustion area for combustion.
Preferably, the fourth perforated partition is inclined to the first longitudinal partition at an angle of 10 ° to 20 °, for example, 10 °, 12 °, 14 °, 16 °, 18 °, or 20 °, but not limited to the values listed, and other values not listed in this range are also applicable.
As a preferred technical scheme of the invention, the coal-fired boiler comprises a boiler body and a hearth, wherein a coal feeding port is arranged at the top of a first chamber in the boiler body, and a first longitudinal partition plate is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
at least 2 rows of fire tubes are arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the tops of the fire tubes are fixed on the first longitudinal partition plate and the furnace top through first perforated partition plates, the bottoms of the fire tubes are fixed on the first longitudinal partition plate through second perforated partition plates, and the second perforated partition plates incline to the furnace bottom and form an angle of 60-70 degrees with the first longitudinal partition plates; a second longitudinal partition plate is downwards arranged at one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate, the lower area of the first cavity is divided into two cavities with communicated bottoms, namely a third cavity and a fourth cavity, the fourth cavity is positioned below the fire tube, an over-fire air inlet is arranged in the fourth cavity, a fire grate is arranged at the bottom of the third cavity, and an air port is arranged on the furnace body below the fire grate;
a first inclined partition plate is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal partition plate in the first chamber, the top end of the first inclined partition plate is fixed on the furnace wall far away from the first longitudinal partition plate, the first inclined partition plate is inclined towards the lower part of the furnace body and forms a distance of 20-30 degrees with the furnace wall, a third longitudinal partition plate is arranged at the lower end of the first inclined partition plate, and a space for material circulation is reserved between the third longitudinal partition plate and the fire tube;
the second chamber is internally provided with a heat exchange tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
As a preferred technical scheme of the invention, the coal-fired boiler comprises a boiler body and a hearth, the side wall of the upper part of the second chamber is provided with a coal feeding port, and the hearth is internally provided with a first longitudinal partition plate at the bottom of the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
at least 2 rows of fire tubes are arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the tops of the fire tubes are fixed on the first longitudinal partition plate and the furnace top through first perforated partition plates, the bottoms of the fire tubes are fixed on the first longitudinal partition plate through second perforated partition plates, and the second perforated partition plates incline to the furnace bottom and form an angle of 60-70 degrees with the first longitudinal partition plates; a second longitudinal partition plate is downwards arranged at one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate, the lower area of the first cavity is divided into two cavities with communicated bottoms, namely a third cavity and a fourth cavity, the fourth cavity is positioned below the fire tube, an over-fire air inlet is arranged in the fourth cavity, a fire grate is arranged at the bottom of the third cavity, and an air port is arranged on the furnace body below the fire grate;
a first inclined partition plate is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal partition plate in the first chamber, the first inclined partition plate is inclined towards the lower part of the furnace body and forms a distance of 20-30 degrees with the furnace wall, a third longitudinal partition plate is arranged at the lower end of the first inclined partition plate, a space for material circulation is reserved between the third longitudinal partition plate and the fire tube, a downward fourth longitudinal partition plate is arranged at the upper end of the first inclined partition plate, and a space for gas circulation is reserved between the fourth longitudinal partition plate and the furnace wall;
at least 2 rows of fire tubes are arranged at the upper part of the second chamber, the length of the fire tubes is smaller than that of the fire tubes arranged in the first chamber, the top of the fire tubes in the second chamber is fixed on the first longitudinal partition plate and the furnace top through a third partition plate with holes, the bottom of the fire tubes is fixed on the first longitudinal partition plate through a fourth partition plate with holes, and the fourth partition plate with holes inclines to one side of the first longitudinal partition plate and forms an angle of 10-20 degrees with the first longitudinal partition plate;
the second chamber is internally provided with a heat exchange tube which is positioned in the space at the lower part of the fire tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
In a second aspect, the present invention provides a treatment method for the above coal-fired boiler, comprising the steps of:
(a) adding fuel from a coal feeding port, and carrying out pyrolysis gasification under the action of heat provided by a fuel fire tube to generate tar, pyrolysis gas and semicoke;
(b) the tar, the pyrolysis gas and the semicoke generated in the step (a) move downwards and enter a semicoke combustion area for semicoke combustion, and gas required by the semicoke combustion area for combustion is supplied through a tuyere below a fire grate;
(c) and (b) carrying out high-temperature combustion on the flue gas generated by the semicoke combustion in the step (b) under the action of over-fire air, supplying heat generated in the combustion process to pyrolysis gasification through a fire tube, and discharging the flue gas after heat exchange of the combusted flue gas out of the furnace body.
As a preferable technical scheme of the invention, the fuel in the step (a) is clean briquette.
Preferably, the volumetric oxygen content in the pyrolysis gasification in step (a) is < 3%, for example 2.5%, 2%, 1.5% or 1%, etc., but is not limited to the recited values, and other values not recited in this range are equally applicable.
Preferably, the pyrolysis gasification in step (a) is carried out at a temperature of 500 ℃ to 700 ℃, such as 500 ℃, 550 ℃, 600 ℃, 650 ℃ or 700 ℃, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the temperature of the semicoke combustion in step (b) is 870 ℃ to 950 ℃, such as 870 ℃, 900 ℃, 930 ℃ or 950 ℃, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the amount of oxygen in the char combustion in step (b) is from 6% to 8%, such as 6%, 6.5%, 7%, 7.5% or 8%, but not limited to the recited values, and other values not recited within this range are equally applicable.
Preferably, the high temperature combustion in step (c) has an oxygen content of 8% to 10%, for example 8%, 8.5%, 9%, 9.5% or 10%, but not limited to the recited values, and other values not recited within the range are equally applicable.
Preferably, the combustion temperature of the high temperature combustion in step (c) is 900 ℃ to 1050 ℃, such as 900 ℃, 930 ℃, 950 ℃, 970 ℃, 1000 ℃, 1030 ℃ or 1050 ℃, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the CO concentration in the flue gas after combustion in the step (c) is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3。
As a preferred technical solution of the present invention, the processing method includes the steps of:
(a) adding fuel from a coal feeding port, and carrying out pyrolysis gasification under the action of heat provided by a fuel fire tube to generate tar, pyrolysis gas and semicoke, wherein the volume content of oxygen in the pyrolysis gasification is less than 3%, and the temperature of the pyrolysis gasification is 500-700 ℃;
(b) the tar, the pyrolysis gas and the semicoke generated in the step (a) move downwards and enter a semicoke combustion area for semicoke combustion, wherein the semicoke combustion temperature is 850-950 ℃, and the oxygen content in the semicoke combustion is 6-8%;
(c) performing high-temperature combustion on the flue gas generated by the semicoke combustion in the step (b) under the action of over-fire air, supplying heat generated in the combustion process to pyrolysis gasification through a fire tube, and discharging the flue gas after the combustion out of a furnace body after heat exchange, wherein the oxygen content in the high-temperature combustion is 8-10%, the combustion temperature of the high-temperature combustion is 900-1050 ℃, and the CO concentration in the flue gas after the combustion is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3。
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the fire tube is additionally arranged in the furnace body, and the existence of oxygen in the dry distillation pyrolysis area is eliminated by utilizing a heat conduction mode, so that the dry distillation pyrolysis is realized in a real sense, the influence of oxygen on the pyrolysis is reduced, and the pollutant discharge amount is effectively reduced;
(2) according to the invention, the fire tube is additionally arranged in the furnace body, so that the heat exchange area of pyrolysis and dry distillation is increased, and the pyrolysis degree of fuel is increased;
(3) the invention can effectively reduce the possibility of hearth deflagration by adding the pyrolysis gas circulation area;
(4) the CO concentration in the flue gas discharged from the furnace body of the coal-fired boiler is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3And the combustion efficiency of the boiler can be further improved to 85%.
Drawings
FIG. 1 is a schematic structural view of a coal-fired boiler described in example 1 of the present invention;
FIG. 2 is a schematic structural view of a coal-fired boiler described in example 2 of the present invention;
the device comprises a coal feeding port 1, a first longitudinal partition plate 2, a fire tube 3, a first perforated partition plate 4, a second perforated partition plate 5, a second longitudinal partition plate 6, a overfire air inlet 7, a grate 8, a tuyere 9, a first inclined partition plate 10, a heat exchange tube 11, a flue gas outlet 12, a third longitudinal partition plate 13, a fourth longitudinal partition plate 14, a third perforated partition plate 15 and a fourth perforated partition plate 16.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The embodiment of the invention provides a staged combustion coal-fired boiler, which comprises a boiler body and a hearth, wherein the top of the boiler body is provided with a coal feeding port 1, and the bottom of the hearth is internally provided with a first longitudinal partition plate 2 which divides the internal area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
the upper part in the first chamber is provided with a fire tube 3 on the side 2 of the first longitudinal partition plate, the top of the fire tube 3 is fixed on the first longitudinal partition plate and the furnace top through a first perforated partition plate 4, the bottom of the fire tube 3 is fixed on the first longitudinal partition plate 2 through a second perforated partition plate 5, one end of the second perforated partition plate 5, which is not fixed on the first longitudinal partition plate 2, is provided with a second longitudinal partition plate 6 downwards, the lower area of the first chamber is divided into two chambers with communicated bottoms, namely a third chamber and a fourth chamber, the fourth chamber is positioned below the fire tube 3, the fourth chamber is internally provided with an over-fired air inlet 7, the bottom of the third chamber is provided with a fire grate 8, and a furnace body below the fire grate 8 is provided with an air port 9;
a first inclined clapboard 10 is arranged in a space between the fire tube 3 and the furnace wall far away from the first longitudinal clapboard 1 in the first chamber, the first inclined clapboard 10 inclines towards the lower part of the furnace body, and a space for materials to pass is reserved between the first inclined clapboard 10 and the fire tube 3;
the inside of the second chamber is provided with a heat exchange tube 11, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet 12.
The treatment method of the coal-fired boiler comprises the following steps:
(a) adding fuel from the coal adding port 2, and carrying out pyrolysis gasification under the action of heat provided by the fuel fire tube 3 to generate tar, pyrolysis gas and semicoke;
(b) the tar, the pyrolysis gas and the semicoke generated in the step (a) move downwards and enter a semicoke combustion area for semicoke combustion;
(c) and (b) carrying out high-temperature combustion on the flue gas generated by the semicoke combustion in the step (b) under the action of over-fire air, supplying heat generated in the combustion process to pyrolysis gasification through a fire tube 3, and discharging the flue gas after heat exchange of the combusted flue gas out of the furnace body.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a coal-fired boiler with staged combustion, as shown in fig. 1, the coal-fired boiler comprises a boiler body and a hearth, a coal feeding port 1 is arranged at the top of a first chamber in the boiler body, a feeding device is arranged at the coal feeding port 1, and a first longitudinal partition plate 2 is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
wherein, in the upper part in the first chamber, 3-4 rows of fire tubes 3 are arranged on the side 2 of the first longitudinal clapboard, the tops of the fire tubes 3 are fixed on the first longitudinal clapboard 2 and the furnace top through a first perforated clapboard 4, the bottoms of the fire tubes 3 are fixed on the first longitudinal clapboard 2 through a second perforated clapboard 5, and the second perforated clapboard 5 inclines towards the furnace bottom and forms an angle of 65 degrees with the first longitudinal clapboard 2; a second longitudinal partition plate 6 is downwards arranged at one end, which is not fixed on the first longitudinal partition plate 2, of the second perforated partition plate 5, the lower area of the first chamber is divided into two chambers with communicated bottoms, namely a third chamber and a fourth chamber, the fourth chamber is positioned below the fire tube 3, an over-fire air inlet 7 is arranged in the fourth chamber, a fire grate 8 is arranged at the bottom of the third chamber, and an air port 9 is arranged on a furnace body below the fire grate 8;
a first inclined clapboard 10 is arranged in a space between the fire tube 3 and the furnace wall far away from the first longitudinal clapboard 2 in the first chamber, the top end of the first inclined clapboard 10 is fixed on the furnace wall far away from the first longitudinal clapboard 2, the first inclined clapboard 10 inclines towards the lower part of the furnace body and forms 25 degrees with the furnace wall, a third longitudinal clapboard 13 is arranged at the lower end of the first inclined clapboard 10, and a space for material circulation is reserved between the third longitudinal clapboard 13 and the fire tube 3;
the inside of the second chamber is provided with a heat exchange tube 11, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet 12.
The treatment method of the coal-fired boiler comprises the following steps:
(a) adding fuel from a coal adding port 2, enabling the fuel to fall onto a first inclined partition plate 10, and performing pyrolysis gasification under the action of heat provided by a fire tube 3 to generate tar, pyrolysis gas and semicoke, wherein the volume content of oxygen in the pyrolysis gasification is less than 3%, and the temperature of the pyrolysis gasification is 600 ℃;
(b) allowing the tar, pyrolysis gas and semicoke generated in the step (a) to move downwards through a space for material circulation between the third longitudinal partition plate 13 and the fire tube 3, and allowing the tar, pyrolysis gas and semicoke to enter a semicoke combustion area for semicoke combustion, wherein the semicoke combustion temperature is 900 ℃, and the oxygen content in the semicoke combustion is 7%;
(c) the flue gas generated by the semicoke combustion in the step (b) is subjected to high-temperature combustion under the action of the overfire air introduced from the overfire air inlet 7, the heat generated in the combustion process is supplied to pyrolysis gasification through the fire tube 3, the combusted flue gas passes through the fire tube 3 and is discharged out of the furnace body after heat exchange through the heat exchange tube 11, wherein the oxygen content in the high-temperature combustion is 9 percent, the combustion temperature of the high-temperature combustion is 1000 ℃, and the CO concentration in the combusted flue gas is less than 290mg/Nm3，NOxThe concentration is less than 180mg/Nm3，SO2The concentration is less than 360mg/Nm3。
The combustion efficiency of the boiler in the embodiment can be further improved to 86%.
Example 2:
the embodiment provides a coal-fired boiler with staged combustion, as shown in fig. 2, the coal-fired boiler comprises a boiler body and a hearth, a coal feeding port 1 is arranged at the top of a first chamber in the boiler body, a feeding device is arranged at the coal feeding port 1, and a first longitudinal partition plate 2 is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
wherein, 3-4 rows of fire tubes 3 are arranged at the side of the first longitudinal partition plate 2 at the upper part in the first chamber, the tops of the fire tubes 3 are fixed on the first longitudinal partition plate 2 and the furnace top through the first perforated partition plate 4, the bottoms of the fire tubes 3 are fixed on the first longitudinal partition plate 2 through the second perforated partition plate 5, and the second perforated partition plate 5 inclines towards the furnace bottom and forms an angle of 60 degrees with the first longitudinal partition plate; a second longitudinal partition plate 6 is downwards arranged at one end, which is not fixed on the first longitudinal partition plate 2, of the second perforated partition plate 5, the lower area of the first chamber is divided into two chambers with communicated bottoms, namely a third chamber and a fourth chamber, the fourth chamber is positioned below the fire tube 3, an over-fire air inlet 7 is arranged in the fourth chamber, a fire grate 8 is arranged at the bottom of the third chamber, and an air port 9 is arranged on a furnace body below the fire grate 8;
a first inclined partition plate 10 is arranged in a space between the fire tube 3 and the furnace wall far away from the first longitudinal partition plate 2 in the first chamber, the first inclined partition plate 10 inclines towards the lower part of the furnace body and forms an angle of 30 degrees with the first longitudinal partition plate at an angle of 70 degrees, a third longitudinal partition plate 13 is arranged at the lower end of the first inclined partition plate 10, a space for material circulation is reserved between the third longitudinal partition plate 13 and the fire tube 3, a downward fourth longitudinal partition plate 14 is arranged at the upper end of the first inclined partition plate 10, and a space for gas circulation is reserved between the fourth longitudinal partition plate 14 and the furnace wall;
arranging 3-4 rows of fire tubes 3 at the upper part of a second chamber, wherein the length of the fire tubes 3 is less than that of the fire tubes 3 arranged in the first chamber, the top of the fire tubes 3 in the second chamber is fixed on a first longitudinal partition plate 2 and a furnace top through a third perforated partition plate 15, the bottom of the fire tubes 3 is fixed on the first longitudinal partition plate through a fourth perforated partition plate 16, and the fourth perforated partition plate 16 inclines to one side of the first longitudinal partition plate 2 and forms an angle of 15 degrees with the first longitudinal partition plate 2;
the inside heat exchange tube 8 that is equipped with of second cavity, heat exchange tube 8 are located the space of firetube 3 lower part, are equipped with flue gas discharge port 12 on the oven of second cavity bottom.
The treatment method of the coal-fired boiler comprises the following steps:
(a) adding fuel from a coal adding port 2, passing through fire tubes 3 arranged in a second chamber and a first chamber, and performing pyrolysis gasification under the action of heat provided by the fire tubes 3 to generate tar, pyrolysis gas and semicoke, wherein the volume content of oxygen in the pyrolysis gasification is less than 3%, and the temperature of the pyrolysis gasification is 500 ℃;
(b) the tar and the pyrolysis gas semicoke generated in the step (a) move downwards through a space for the circulation of materials between the third longitudinal partition plate 13 and the fire tube 3, and meanwhile, the pyrolysis gas also enters a semicoke combustion area through a space for the circulation of gas between the fourth longitudinal partition plate 14 and the furnace wall to carry out semicoke combustion, wherein the semicoke combustion temperature is 850 ℃, and the oxygen content in the semicoke combustion is 6%;
(c) the flue gas generated by the semicoke combustion in the step (b) is subjected to high-temperature combustion under the action of the overfire air introduced from the overfire air inlet 7, the heat generated in the combustion process is supplied to pyrolysis gasification through the fire tube 3, the combusted flue gas passes through the fire tube 3 and is discharged out of the furnace body after heat exchange through the heat exchange tube 11, wherein the oxygen content in the high-temperature combustion is 8 percent, the combustion temperature of the high-temperature combustion is 900 ℃, and the CO concentration in the combusted flue gas is less than 280mg/Nm3，NOxThe concentration is less than 175mg/Nm3，SO2The concentration is less than 360mg/Nm3。
The combustion efficiency of the boiler of the embodiment can be further improved to 87%.
Example 3:
the present embodiment provides a coal-fired boiler for staged combustion, which is structured as described in embodiment 2, except that: the top end of the first inclined clapboard 10 is fixed on the furnace wall far away from the first longitudinal clapboard 2, the second clapboard with holes 5 inclines towards the furnace bottom and forms 70 degrees with the first longitudinal clapboard, the first inclined clapboard 10 inclines towards the lower part of the furnace body and forms 20 degrees with the furnace wall, and the fourth clapboard with holes 16 inclines towards one side of the first longitudinal clapboard 2 and forms 20 degrees with the first longitudinal clapboard 2.
The treatment of the coal-fired boiler was carried out in accordance with the method of example 2, except that: the pyrolysis and gasification temperature in the step (a) is 700 ℃, the burning temperature of the coke in the step (b) is 950 ℃, the oxygen content in the semicoke burning is 8%, the oxygen content in the high-temperature burning in the step (c) is 10%, and the burning temperature of the high-temperature burning is 1050 ℃.
In the embodiment, the CO concentration in the flue gas discharged by the boiler is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3The combustion efficiency can be further improved to 85%.
Comparative example 1:
this comparative example provides a staged combustion coal-fired boiler whose structure is similar to that of the boiler of example 1 except that: the fire tube 3 is not arranged in the first cavity, namely the fire tube 3 is not arranged any more to provide heat and eliminate oxygen for pyrolysis gasification, and the pyrolysis gasification is carried out under the condition of oxygen deficiency at 500-550 ℃.
In this comparative example, the absence of the fire tube 3 in the first chamber would prevent pyrolysis from being carried out effectively, and the CO concentration in the flue gas exiting the boiler would be greater than 450mg/Nm3，NOxThe concentration is more than 400mg/Nm3，SO2The concentration is more than 600mg/Nm3The combustion efficiency of the boiler is only 75%.
Comparative example 2:
this comparative example provides a staged combustion coal-fired boiler whose structure is similar to that of the boiler of example 2 except that: the fire tubes 3 are not arranged in the first cavity and the second cavity, namely the fire tubes 3 are not arranged any more to provide heat and eliminate oxygen for pyrolysis gasification, the pyrolysis gasification is carried out under the condition of oxygen deficiency at the temperature of 500-550 ℃, and the coal feeding port 1 is arranged at the upper part of the first cavity.
In this comparative example, the absence of fire tubes 3 in the first and second chambers would prevent the pyrolysis from proceeding effectively, and thus NO in the flue gas exiting the boilerxHigh CO concentration greater than 450mg/Nm3，NOxThe concentration is more than 450mg/Nm3，SO2The concentration is more than 600mg/Nm3The combustion efficiency of the boiler is only 75%.
The embodiment and the comparative example are integrated, so that the dry distillation pyrolysis is realized in a real sense, the influence of oxygen on the pyrolysis is reduced, and the pollutant discharge is effectively reduced by adding the fire tube in the furnace body and eliminating the existence of oxygen in a dry distillation pyrolysis area in a heat conduction mode;
according to the invention, the fire tube is additionally arranged in the furnace body, so that the heat exchange area of pyrolysis and dry distillation is increased, and the pyrolysis degree of fuel is increased;
the invention can effectively reduce the possibility of hearth deflagration by adding the pyrolysis gas circulation area;
the CO concentration in the flue gas discharged from the furnace body of the coal-fired boiler is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3And the combustion efficiency of the boiler can be further improved to 85%.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (28)

1. A coal-fired boiler with staged combustion is characterized by comprising a boiler body and a hearth, wherein a coal feeding port is formed in the top of the boiler body, a first longitudinal partition plate is arranged at the bottom of the hearth in the hearth and divides the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
the fire tube is arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the top of the fire tube is fixed on the first longitudinal partition plate and the furnace top through the first perforated partition plate, the bottom of the fire tube is fixed on the first longitudinal partition plate through the second perforated partition plate, one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate is downwards provided with the second longitudinal partition plate, the lower area of the first chamber is divided into two chambers with communicated bottoms, namely a third chamber and a fourth chamber, the fourth chamber is positioned below the fire tube, an over-fire air inlet is arranged in the fourth chamber, the bottom of the third chamber is provided with a fire grate, and a furnace body below the fire grate is provided with an air;
a first inclined clapboard is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal clapboard in the first chamber, the first inclined clapboard inclines towards the lower part of the furnace body, and a space for materials to pass is reserved between the first inclined clapboard and the fire tube;
the second chamber is internally provided with a heat exchange tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
2. The coal-fired boiler of claim 1, wherein a feeding device is provided at the coal charging port.
3. The coal fired boiler of claim 1, the coal feed port is disposed at a top of the first chamber.
4. The coal-fired boiler according to claim 1, the coal-charging port is provided at an upper side wall of the second chamber.
5. The coal-fired boiler according to claim 1, wherein the number of fire tubes is not less than 2.
6. The coal-fired boiler according to claim 5, wherein the number of fire tubes is 12 to 16.
7. The coal-fired boiler according to claim 1, wherein the second perforated partition plate is inclined toward the furnace bottom.
8. The coal-fired boiler according to claim 1, wherein the second perforated partition is inclined toward the furnace bottom at an angle of 60 ° to 70 ° with respect to the first longitudinal partition.
9. The coal-fired boiler according to claim 1, wherein the first inclined partition is inclined toward the lower portion of the furnace body at an angle of 20 ° to 30 ° with respect to the furnace wall.
10. The coal-fired boiler according to claim 1, wherein the first inclined partition top end is fixed to the wall of the furnace remote from the first longitudinal partition.
11. The coal-fired boiler according to claim 1, wherein the first inclined partition is provided at a lower end thereof with a third longitudinal partition, and a space for the circulation of the material is left between the third longitudinal partition and the fire tube.
12. The coal-fired boiler according to claim 1, wherein the first inclined partition is provided at an upper end thereof with a fourth longitudinal partition directed downward, and a space for gas to flow is provided between the fourth longitudinal partition and the wall of the furnace.
13. The coal-fired boiler according to claim 12, wherein when the port for charging coal is provided in the upper side wall of the second chamber, a fire tube is provided in the upper part of the second chamber, the top of the fire tube is fixed to the first longitudinal partition and the ceiling by a third perforated partition, the bottom of the fire tube is fixed to the first longitudinal partition by a fourth perforated partition, and the heat exchange tube in the second chamber is located in a space below the fire tube.
14. The coal fired boiler of claim 12, wherein the length of the fire tube disposed in the second chamber is not greater than the length of the fire tube disposed in the first chamber.
15. The coal-fired boiler according to claim 13, wherein the fourth perforated partition is inclined to the side of the first longitudinal partition.
16. The coal-fired boiler according to claim 13, wherein the fourth perforated partition is inclined to the first longitudinal partition at an angle of 10 ° to 20 °.
17. The coal-fired boiler according to claim 1, characterized in that the coal-fired boiler comprises a boiler body and a hearth, a coal feeding port is arranged at the top of a first chamber in the boiler body, a first longitudinal partition plate is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
at least 2 rows of fire tubes are arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the tops of the fire tubes are fixed on the first longitudinal partition plate and the furnace top through first perforated partition plates, the bottoms of the fire tubes are fixed on the first longitudinal partition plate through second perforated partition plates, and the second perforated partition plates incline to the furnace bottom and form an angle of 60-70 degrees with the first longitudinal partition plates; a second longitudinal partition plate is downwards arranged at one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate, the lower area of the first cavity is divided into two cavities with communicated bottoms, namely a third cavity and a fourth cavity, the fourth cavity is positioned below the fire tube, an over-fire air inlet is arranged in the fourth cavity, a fire grate is arranged at the bottom of the third cavity, and an air port is arranged on the furnace body below the fire grate;
a first inclined partition plate is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal partition plate in the first chamber, the top end of the first inclined partition plate is fixed on the furnace wall far away from the first longitudinal partition plate, the first inclined partition plate is inclined towards the lower part of the furnace body and forms a distance of 20-30 degrees with the furnace wall, a third longitudinal partition plate is arranged at the lower end of the first inclined partition plate, and a space for material circulation is reserved between the third longitudinal partition plate and the fire tube;
the second chamber is internally provided with a heat exchange tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
18. The coal-fired boiler according to claim 1, characterized in that the coal-fired boiler comprises a boiler body and a hearth, the upper side wall of the second chamber is provided with a coal feeding port, and a first longitudinal partition plate is arranged at the bottom of the hearth in the hearth to divide the inner area of the hearth into two chambers with communicated tops, namely a first chamber and a second chamber;
at least 2 rows of fire tubes are arranged on the side of the first longitudinal partition plate at the upper part in the first chamber, the tops of the fire tubes are fixed on the first longitudinal partition plate and the furnace top through first perforated partition plates, the bottoms of the fire tubes are fixed on the first longitudinal partition plate through second perforated partition plates, and the second perforated partition plates incline to the furnace bottom and form an angle of 60-70 degrees with the first longitudinal partition plates; a second longitudinal partition plate is downwards arranged at one end, which is not fixed on the first longitudinal partition plate, of the second perforated partition plate, the lower area of the first cavity is divided into two cavities with communicated bottoms, namely a third cavity and a fourth cavity, the fourth cavity is positioned below the fire tube, an over-fire air inlet is arranged in the fourth cavity, a fire grate is arranged at the bottom of the third cavity, and an air port is arranged on the furnace body below the fire grate;
a first inclined partition plate is arranged in a space between the fire tube and the furnace wall far away from the first longitudinal partition plate in the first chamber, the first inclined partition plate is inclined towards the lower part of the furnace body and forms a distance of 20-30 degrees with the furnace wall, a third longitudinal partition plate is arranged at the lower end of the first inclined partition plate, a space for material circulation is reserved between the third longitudinal partition plate and the fire tube, a downward fourth longitudinal partition plate is arranged at the upper end of the first inclined partition plate, and a space for gas circulation is reserved between the fourth longitudinal partition plate and the furnace wall;
at least 2 rows of fire tubes are arranged at the upper part of the second chamber, the length of the fire tubes is smaller than that of the fire tubes arranged in the first chamber, the top of the fire tubes in the second chamber is fixed on the first longitudinal partition plate and the furnace top through a third partition plate with holes, the bottom of the fire tubes is fixed on the first longitudinal partition plate through a fourth partition plate with holes, and the fourth partition plate with holes inclines to one side of the first longitudinal partition plate and forms an angle of 10-20 degrees with the first longitudinal partition plate;
the second chamber is internally provided with a heat exchange tube which is positioned in the space at the lower part of the fire tube, and the furnace wall at the bottom of the second chamber is provided with a flue gas outlet.
19. The method for treating a coal-fired boiler according to any one of claims 1 to 18, characterized in that the method for treating comprises the steps of:
(a) adding fuel from a coal feeding port, and carrying out pyrolysis gasification under the action of heat provided by a fuel fire tube to generate tar, pyrolysis gas and semicoke;
(b) the tar, the pyrolysis gas and the semicoke generated in the step (a) move downwards and enter a semicoke combustion area for semicoke combustion;
(c) and (b) carrying out high-temperature combustion on the flue gas generated by the semicoke combustion in the step (b) under the action of over-fire air, supplying heat generated in the combustion process to pyrolysis gasification through a fire tube, and discharging the flue gas after heat exchange of the combusted flue gas out of the furnace body.
20. The process of claim 19, wherein the fuel of step (a) is clean coal.
21. The process of claim 19, wherein the volumetric oxygen content in the pyrolysis gasification of step (a) is < 3%.
22. The process of claim 19, wherein the pyrolysis gasification temperature of step (a) is 500 ℃ to 700 ℃.
23. The process of claim 19, wherein the temperature of the semicoke combustion in step (b) is 870 ℃ to 950 ℃.
24. The process of claim 19, wherein the oxygen content in the char combustion of step (b) is from 6% to 8%.
25. The process of claim 19, wherein the oxygen content in the high temperature combustion in step (c) is 8% to 10%.
26. The process of claim 19, wherein the combustion temperature of the high temperature combustion in step (c) is 900 ℃ to 1050 ℃.
27. The process of claim 19 wherein the CO concentration in the flue gas after combustion in step (c) is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3。
28. A method of treatment according to any one of claims 19-27, characterized in that it comprises the steps of:
(a) adding fuel from a coal feeding port, and carrying out pyrolysis gasification under the action of heat provided by a fuel fire tube to generate tar, pyrolysis gas and semicoke, wherein the volume content of oxygen in the pyrolysis gasification is less than 3%, and the temperature of the pyrolysis gasification is 500-700 ℃;
(b) the tar, the pyrolysis gas and the semicoke generated in the step (a) move downwards and enter a semicoke combustion area for semicoke combustion, wherein the semicoke combustion temperature is 850-950 ℃, and the oxygen content in the semicoke combustion is 6-8%;
(c) performing high-temperature combustion on the flue gas generated by the semicoke combustion in the step (b) under the action of over-fire air, supplying heat generated in the combustion process to pyrolysis gasification through a fire tube, and discharging the flue gas after the combustion out of a furnace body after heat exchange, wherein the oxygen content in the high-temperature combustion is 8-10%, the combustion temperature of the high-temperature combustion is 900-1050 ℃, and the CO concentration in the flue gas after the combustion is less than 300mg/Nm3，NOxThe concentration is less than 200mg/Nm3，SO2The concentration is less than 400mg/Nm3。
CN201811405615.7A 2018-11-23 2018-11-23 Environment-friendly coal-fired boiler achieving staged combustion and treatment method thereof Active CN109578978B (en)

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CN2061173U (en) * 1989-09-23 1990-08-29 马东生 High efficiency energy-saving dual-purpose stove for drying and dry distillation
CN2124401U (en) * 1992-04-17 1992-12-09 李春霖 Domestic multipurpose coal stove
CN2784750Y (en) * 2004-11-23 2006-05-31 王旻 Clean coal-fired heat pipe hot-air furnace
CN2901154Y (en) * 2006-05-25 2007-05-16 崔洪清 Gasifying room burning boiler
JP4415087B2 (en) * 2006-08-10 2010-02-17 独立行政法人 宇宙航空研究開発機構 Incinerator
CN204513354U (en) * 2014-12-24 2015-07-29 海盐县吉能生物质燃料有限公司 A kind of biomass molding fuel burning boiler
CN107477569A (en) * 2017-09-13 2017-12-15 兖矿集团有限公司 The coal furnace and its cooking heating method and purposes of a kind of environmental protection and energy saving

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