CN105258115B - Porous wall wind couples the pulverized coal combustion system of air classification - Google Patents

Porous wall wind couples the pulverized coal combustion system of air classification Download PDF

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Publication number
CN105258115B
CN105258115B CN201510685385.4A CN201510685385A CN105258115B CN 105258115 B CN105258115 B CN 105258115B CN 201510685385 A CN201510685385 A CN 201510685385A CN 105258115 B CN105258115 B CN 105258115B
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air
porous
furnace
wind
burning
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CN105258115A (en
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马红和
周璐
范江
马素霞
崔志刚
贾涛
尚福栋
欧聪
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Taiyuan University of Technology
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Taiyuan University of Technology
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Abstract

The invention belongs to the clean and effective combustion field of coal, more particularly to a kind of porous wall wind couples the pulverized coal combustion system of air classification.Porous wall wind couples the pulverized coal combustion system of air classification, air and coal dust intermixture light burning after entering burning furnace roof, from top to bottom by being burnt at porous wall wind coupling, by being burnt at complete burning, waste gas and waste residue are separated after furnace bottom discharge, and the waste gas isolated filters flying dust by filter, is cooled down through subcooler, detected by flue gas analyzer, be finally discharged into environment.The porous wall wind of the present invention can protect wall, prevent high temperature corrosion;Porous wall wind vertically blows to burner hearth, enhances the mixing of coal dust and air, promotes the burning of coal dust.

Description

Porous wall wind couples the pulverized coal combustion system of air classification
Technical field
The invention belongs to the clean and effective combustion field of coal, more particularly to a kind of porous wall wind couples the coal dust of air classification Combustion system.
Background technology
The air staged combustion technology of coal dust is the low nitrogen oxide burning technology being most widely used, it is characterized in that will combustion Partial air needed for burning(Also known as separate burnout degree)Introduced from away from main burner suitable distance, so that combustion zone be split as Combustion with meagre oxygen area(Also known as reducing zone)And oxygen-rich area.Pulverized coal air grading combustion technology has very much for reduction discharged nitrous oxides Effect, but there is also following shortcoming:1)High temperature corrosion easily occurs for water-cooling wall.Using Researched of Air Staging Combustion Burning Pulverized Coal, the combustion with meagre oxygen of burner hearth Area generates the reducing substanceses such as substantial amounts of hydrogen sulfide, CO, carbon residue.Once glancing off, air-flow just will consumingly hit water-cooled Wall, triggers water wall high temperature corrosion and slagging scorification.2)Combustion Efficiency of Coal Powder is reduced.Using Researched of Air Staging Combustion Burning Pulverized Coal, coal dust combustion has been postponed Burn, unburned carbon in flue dust increase reduces efficiency of combustion.
In order to prevent high temperature corrosion, people install adherent wind additional to improve the oxidizing atmosphere on water-cooling wall in burner hearth side wall, with The reducibility gas such as removal of hydrogen sulfide, carbon monoxide.But, the introducing of adherent wind usually triggers following problem:1)Adherent wind is Horizontal direction, and it is parallel with wall-cooling surface, it is a kind of invalid wind for coal dust firing, it is impossible to improve efficiency of combustion;2)Patch Wall wind is consentrated air supply, and the skewness in burner hearth result in the fast skewness of furnace outlet gas temperature, cigarette, aggravate heating surface Heat absorption deviation, easily trigger security incident.Why adherent wind produces above mentioned problem, and reason has two:1)Wind direction is parallel to water Cold wall, causes it to participate in coal dust firing;2)The air distribution mode of air intake is concentrated, causes air distribution skewness in stove.
The content of the invention
The technical problems to be solved by the invention are:How the coal dust firing that a kind of porous wall wind couples air classification is provided System, the system can realize low-nitrogen oxide discharging and coal dust efficient burning simultaneously, will not produce again high temperature corrosion, dust stratification and By thermal deviation.
The technical solution adopted in the present invention is:Porous wall wind couples the pulverized coal combustion system of air classification, air and coal Powder mixture lights burning after entering burning furnace roof, from top to bottom by being burnt at porous wall wind coupling, at complete burning Burning, waste gas and waste residue are separated after furnace bottom discharge, and the waste gas isolated filters flying dust by filter, through subcooler Cooled down, detected by flue gas analyzer, be finally discharged into environment.
It is used as a kind of preferred embodiment:It is cavernous furnace wall to refer to combustion furnace the preceding paragraph furnace wall at porous wall wind coupling, many There is the rotary air around furnace wall to enter inside cavernous furnace wall on the outside of poroid furnace wall, on the outside of cavernous furnace wall There is flow valve rotary air porch.
It is used as a kind of preferred embodiment:Refer to there is air intlet on the cross section of combustion furnace the preceding paragraph furnace wall at complete burning, it is empty There is flow valve at gas import.
It is used as a kind of preferred embodiment:The air of all entrance combustion furnaces was all preheated.
The beneficial effects of the invention are as follows:The porous wall wind of the present invention can protect wall, prevent high temperature corrosion;Porous wall wind Burner hearth is vertically blowed to, the mixing of coal dust and air is enhanced, the burning of coal dust is promoted;Porous wall wind is equivalent to short transverse Upper to carry out multiple Researched of Air Staging Combustion Burning Pulverized Coal, advantageously being blown into reduction discharged nitrous oxides porous wall wind, also corresponds to carry out " soot blowing ", can effectively prevent fouling of heating surface;Porous wall wind is uniformly introduced by the aperture on wall, can eliminate the suction of heating surface Thermal deviation.The present invention is adjusted and flowed at flow valve and complete burning at porous wall wind coupling by flue gas analyzer testing result Amount valve can be burnt completely, so as to reduce the pollution to environment.
Brief description of the drawings
Fig. 1 is the schematic diagram of the pulverized coal combustion system of porous wall wind coupling air classification of the present invention;
In figure:1st, air compressor machine;2nd, air distributor box;3rd, the first air preheater;4th, the second air preheater;5th, the 3rd Air preheater;6th, the first three-way connection;7th, machine supplying powder;8th, porous wall coupling Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace;9th, the second threeway Joint;10th, air compartment;11st, the 3rd three-way connection;12nd, the 4th three-way connection;13rd, piping filter;14th, gas cooler;15、 5th three-way connection;16th, flue gas analyzer;17th, air-introduced machine;18th, grey slag bath;20th, porous wall wind inlet pipeline, 21, Secondary Air Inlet ductwork.
Embodiment
Reference picture 1, porous wall wind couples the pulverized coal combustion system of air classification, including air compressor machine 1, air distributor box 2, the One air preheater 3, the second air preheater 4, the 3rd air preheater 5, the first three-way connection 6, machine supplying powder 7, porous wall coupling Close Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8, the second three-way connection 9, air compartment 10, the 3rd three-way connection 11, the 4th three-way connection 12, pipeline Filter 13, gas cooler 14, the 5th three-way connection 15, flue gas analyzer 16, air-introduced machine 17, grey slag bath 18.Pressure fan 1 goes out Mouth is connected after pressure-reducing valve, three equipment of stop valve and mass air flow sensor with the entrance of air distributor box 2;Air distributor box 2 Export as three air passages, tie point is pre- with the first air after the regulating valve and mass air flow sensor on the branch road The hot entrance of device 3 connection, the first air preheater 3 outlet is connected after passing through stop valve with an interface of the first three-way connection 6, Machine supplying powder 7 convey coal dust be connected with another interface of the first three-way connection 6, the 3rd interface of the first three-way connection 6 with it is porous The top entry connection of wall wind coupling Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8;Second branch road regulating valve, air stream on the branch road is connected After gauge, it is connected with the entrance of the second air preheater 4, one of the second three-way connection 9 of the second air preheater outlet access Interface, two interfaces of the second three-way connection 9 are connected with two porous wall wind entrances of air compartment 10 respectively;3rd branch road is in connection After regulating valve, mass air flow sensor on the branch road, it is connected with the entrance of the 3rd air preheater 5, the 3rd air preheater 5 goes out Mouthful be connected with an interface of the 3rd three-way connection 11, the other two interface of the 3rd three-way connection 11 respectively with porous wall wind coupling Close two Secondary Air entrances connection of air classification reacting furnace 8;The outlet and the 4th of porous wall wind coupling air classification reacting furnace 8 The interface connection of three-way connection 12, the 4th another interface of three-way connection 12 is connected with the grey entrance of slag bath 18, and the 3rd connects Mouth is connected with the entrance of piping filter 13, and the outlet of piping filter 13 is connected with the entrance of gas cooler 14, gas cooler 14 Outlet is connected after passing through a stop valve with an interface of the 5th three-way connection 15, and another of the 5th three-way connection 15 connects Mouth is connected with the entrance of flue gas analyzer 16, and the 3rd interface is connected with the entrance of air-introduced machine 17, and flue gas is discharged into environment.
Reference picture 1, the porous wall wind for surrounding part by air compartment 10 is coupled uniformly to be opened on the wall of Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8 If a large amount of apertures, form porous wall.
Reference picture 1, two porous wall wind inlet ducts 20, is tangentially welded on air compartment 10 by same direction of rotation;As Further improvement project, porous wall wind inlet pipeline 20 can also be more than two, and should equidistantly be welded on the same of air compartment 10 On height, correspondingly, the second three-way connection 9 should be changed to the joint adapted to inlet pipeline number.
Two Secondary Air entrance pipes 21 are with the form cloth that liquidates on reference picture 1, porous wall wind coupling air classification reacting furnace 8 Put;As further improvement project, Secondary Air entrance number also may be greater than 2 even number, same using the arrangement that liquidates.
The workflow of the present invention can be described as:The compressed air come out from air compressor machine 1 is depressurized through pressure-reducing valve, Ran Houjing Cross stop valve and mass air flow sensor air inlet distributor box 2;The tie point air that air distributor box 2 is drawn is by the branch road Regulating valve and mass air flow sensor after, preheated into the first air preheater 3, then connected after stop valve into the one or three First 6, the coal dust that machine supplying powder 7 is conveyed also enters the first three-way connection 6, and the air and coal dust of tie point are in the first three-way connection 6 Interior mixing, the top entry for coupling Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8 by porous wall wind afterwards enters reacting furnace, and initial burning Burning;The the second branch road air drawn from air distributor box 2 is after regulating valve and mass air flow sensor on the branch road, into the Two air preheaters 4 are preheated, then enter the second three-way connection 9, two from the second three-way connection 9 of air by stop valve Outlet comes out, then the air entered by two porous wall wind inlet pipelines 20 in air compartment 10, air compartment 10 is by a large amount of of wall Aperture is equably blown into porous wall wind coupling Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8, and wall is isolated with the breeze airflow burnt Open, and participate in the burning of breeze airflow;The 3rd branch road air drawn from air distributor box 2 by the regulating valve on the branch road and After mass air flow sensor, preheated into the 3rd air preheater 5, then enter the 3rd three-way connection 11 by stop valve, it is empty Gas is drawn from two interfaces of the 3rd three-way connection 11, then enters porous wall wind coupling sky by two secondary air inlet pipelines 21 Qi leel level combustion reaction stove 8, then breeze airflow burns completely in the presence of Secondary Air;Combustion product is connected into the four or three First 12, solid product falls into grey slag bath 18 by the lower part outlet of the 4th three-way connection 12, and gas-phase product is through the 4th three-way connection 12 centre exit enters piping filter 13 and filters flying dust, and gas-phase product is cooled down into gas cooler 14 afterwards, cold But the gas-phase product after enters the 5th three-way connection 15 after stop valve, the gas-phase product come out from the 5th three-way connection 15, It is partly into flue gas analyzer 16 to be detected, remainder is by the row of air-introduced machine 17 to environment.
It is used as a kind of preferred embodiment:Have on the exit passageway of porous wall wind coupling Researched of Air Staging Combustion Burning Pulverized Coal reacting furnace 8 rotation to Under blade so that combustion product is separated in exit passageway by automatic centrifugation, and exit passageway has guiding in the middle part of vaned position Tube inlet, guide wire is drawn from exit passageway, after air blower, is connected to a porous wall wind inlet pipeline 20 of air compartment 10 On, the high portion gas containing carbonomonoxide concentration in the gaseous product of centrifugation is directed to pipe importing porous wall wind inlet pipe Road 20, so as to reduce the concentration of carbon monoxide in exit gas, solid product passes through the lower part outlet of the 4th three-way connection 12 Grey slag bath 18 is fallen into, centre exit of the remaining gas-phase product through the 4th three-way connection 12 enters piping filter 13 and filter flying dust, Gas-phase product is cooled down into gas cooler 14 afterwards, and the gas-phase product after cooling enters the 5th threeway after stop valve Joint 15, the gas-phase product come out from the 5th three-way connection 15, is partly into flue gas analyzer 16 and is detected, remainder By the row of air-introduced machine 17 to environment.
Porous wall wind couples the combustion technology of air classification, can not only realize that low-nitrogen oxide discharging and coal dust are efficient simultaneously Burning, and be prevented from high temperature corrosion, dust stratification and by thermal deviation, utilized for the clean and effective of coal resources with very heavy The application value wanted.It is uniformly to open up a large amount of apertures on the part wall of pulverized coal air fractional combustion reacting furnace reducing zone, Porous wall is formed, clean air, to be uniformly blown into reacting furnace perpendicular to wall-cooling surface direction, is incited somebody to action by the aperture on porous wall The reducing substanceses such as hydrogen sulfide are isolated with wall, prevent that water-cooling wall from occurring high temperature corrosion;These clean airs blending simultaneously enters Breeze airflow, enhances the disturbance of breeze airflow, improves Combustion Efficiency of Coal Powder;Moreover, porous wall wind is along reacting furnace height side Introduced to multilayer, equivalent to multiple Researched of Air Staging Combustion Burning Pulverized Coal, can further reduce discharged nitrous oxides;Porous wall wind is uniformly blown into instead Stove is answered, will be uniformly distributed in stove, will not be produced by thermal deviation;Being blown into for porous wall wind also corresponds to carry out soot blowing, can prevent Dust stratification.By porous wall wind be blown into and the air intake adjustment at the place of being blown into can reach complete burning completely at burning, reduce pair The pollution of air or the cost for reducing vent gas treatment.

Claims (1)

1. porous wall wind couples the pulverized coal combustion system of air classification, it is characterised in that:Air and coal dust intermixture enter burning Burning is lighted after furnace roof, from top to bottom by burning at porous wall wind coupling, by being burnt at complete burning, waste gas and waste residue from Separated after furnace bottom discharge, the waste gas isolated filters flying dust by filter, is cooled down through subcooler, by flue gas Analyzer is detected, is finally discharged at environment, porous wall wind coupling and is referred to that combustion furnace the preceding paragraph furnace wall is cavernous furnace wall, porous There is the rotary air around furnace wall to enter inside cavernous furnace wall on the outside of the furnace wall of shape, the rotation on the outside of cavernous furnace wall Turn have flow valve at air intake, refer to there is air intlet on the cross section of combustion furnace the preceding paragraph furnace wall at complete burning, air enters There is flow valve at mouthful, the air of all entrance combustion furnaces was all preheated.
CN201510685385.4A 2015-10-22 2015-10-22 Porous wall wind couples the pulverized coal combustion system of air classification Active CN105258115B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101942342A (en) * 2010-09-20 2011-01-12 张浩玥 Fixed-bed grading and gasifying continuous gas producing furnace
CN102585907A (en) * 2012-03-02 2012-07-18 上海交通大学 Step oxygen supply dry slag removal pressure gasification testing system
CN102818256A (en) * 2012-09-18 2012-12-12 曾巨泓 Combustor for gasification combustion of biomass formed particles
CN104819472A (en) * 2015-05-25 2015-08-05 山东百川同创能源有限公司 Biomass solid waste and hazardous waste combustion gas production system
CN104879746A (en) * 2015-06-03 2015-09-02 江西前程新能源科技有限公司 Biomass semi-gasification combustion equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101942342A (en) * 2010-09-20 2011-01-12 张浩玥 Fixed-bed grading and gasifying continuous gas producing furnace
CN102585907A (en) * 2012-03-02 2012-07-18 上海交通大学 Step oxygen supply dry slag removal pressure gasification testing system
CN102818256A (en) * 2012-09-18 2012-12-12 曾巨泓 Combustor for gasification combustion of biomass formed particles
CN104819472A (en) * 2015-05-25 2015-08-05 山东百川同创能源有限公司 Biomass solid waste and hazardous waste combustion gas production system
CN104879746A (en) * 2015-06-03 2015-09-02 江西前程新能源科技有限公司 Biomass semi-gasification combustion equipment

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