CN204923923U - Realize device of ultralow nitrogen oxide of heating furnace emission - Google Patents
Realize device of ultralow nitrogen oxide of heating furnace emission Download PDFInfo
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- CN204923923U CN204923923U CN201520671599.1U CN201520671599U CN204923923U CN 204923923 U CN204923923 U CN 204923923U CN 201520671599 U CN201520671599 U CN 201520671599U CN 204923923 U CN204923923 U CN 204923923U
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- catalytic oxidizer
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- air preheater
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model relates to a realize device of ultralow nitrogen oxide of heating furnace emission, the device's chimney below is equipped with the convection chamber, and the convection chamber communicates with each other with the radiation chamber, be equipped with the combustor in the radiation chamber, combustor and air heater pass through the wind channel and connect, and draught fan and air heater pass through the wind channel and connect, air heater passes through the flue and the chimney is connected, air heater entry or exit are equipped with catalytic oxidizer, the air -blower is combustion -supporting air -blower, supplies with air heater and catalytic oxidizer air supply respectively, it supplies with the combustor combustion air governing valve of combustion air volume to be equipped with control on the wind channel for the catalytic oxidizer air feed, be equipped with the catalytic oxidizer air condition valve on the wind channel that combustor and air heater connect, the combustor is low nitrogen oxide combustor. The utility model discloses when realizing that ultralow nitrogen oxide discharges, CO2 and water is become with hydro carbons in the flue gas and the abundant oxidation of CO again, still the heating furnace thermal efficiency can be improved.
Description
Technical field
The utility model relates to the ultralow discharged nitrous oxides technical field of heating furnace, specifically a kind of device realizing the ultralow discharged nitrous oxides of heating furnace.
Background technology
Along with the raising day by day of environmental requirement.Petrochemical industry burner discharge index is all the more strict.In order to realize low-nitrogen oxide discharging, the low nitrogen oxide burning technology of industrial tube furnace burner obtains high speed development.Adopt and force the low nitrogen oxide burner of smoke backflow will control the discharge index of nitrogen oxides in effluent at about 30ppm.Substantially the limiting value controlling thermodynamics NO_x formation has been reached.If want nitrogen oxide to reduce lower level, reach below 10ppm.May be realized hardly by the technological innovation of burner.Low nitrogen oxide burner is along with the reduction of discharge index simultaneously, and flame holding is corresponding reduction also, and when particularly heating-furnace bore temperature is lower than 700 DEG C, flame there will be imperfect combustion, de-fire, flame-out phenomenon.There is a large amount of unburned hydrocarbon class and CO in flue gas of heating furnace, have a strong impact on thermal efficiency of heating furnace.There is the potential safety hazard of tail combustion simultaneously.
Utility model content
The utility model provides a kind of device realizing the ultralow discharged nitrous oxides of heating furnace, while realizing ultralow discharged nitrous oxides, again by fully oxidized to the hydro carbons in flue gas and CO become CO
2and water, improve thermal efficiency of heating furnace about 1% simultaneously.
The utility model for solving the problems of the technologies described above adopted technical scheme is: a kind of device realizing the ultralow discharged nitrous oxides of heating furnace, and this device comprises chimney, convection cell, radiation chamber, burner, air blast, air-introduced machine and air preheater; Be provided with convection cell below described chimney, convection cell communicates with radiation chamber; Burner is provided with in radiation chamber; Described burner is connected by air channel with air preheater, and air-introduced machine is connected by air channel with air preheater; Air preheater is connected with chimney by flue;
Described air preheater entrance is or/and exit is provided with catalytic oxidizer; Described air blast is combustion blower, respectively air supply preheater and catalytic oxidizer air supply; Air channel for catalytic oxidizer air feed is provided with the burner combustion air control valve controlling supply combustion-supporting air quantity; The air channel that described burner is connected with air preheater is provided with catalytic oxidizer air control valve; Described burner is low nitrogen oxide burner.
During convection cell exit gas temperature less than 450 DEG C, described catalytic oxidizer is arranged between convection cell outlet and air preheater entrance, utilizes uncombusted hydro carbons and carbon monoxide in catalyst oxidation flue gas.Described catalytic oxidizer is arranged between convection cell outlet and air preheater entrance.
During convection cell exit gas temperature more than 450 DEG C, described air preheater comprises high-temperature air preheater and low-temperature air preheater; Catalytic oxidizer is arranged between high-temperature air preheater and low-temperature air preheater.At convection cell outlet high-temperature air preheater, when flue-gas temperature being down to below 450 DEG C, then through catalytic oxidizer, after catalytic oxidizer, recycling low-temperature air preheater carry out waste heat recovery, improve furnace thermal efficiency.
Utilize the described discharge technology realizing the device of the ultralow discharged nitrous oxides of heating furnace, technical process is as follows: air blast provides combustion air for burner; The combustion air that air blast bloats is divided into two-way, a road combustion air by after air preheater through control valve, allocate low nitrogen oxide burner into according to equivalent or secondary equivalent; In radiation chamber, complete the burning with fuel, burn for combustion with meagre oxygen, reduce partial pressure of oxygen, the thermodynamics nitrogen oxide that effective control combustion produces; The heated medium of the hot heating radiation indoor that burning produces; Due to combustion with meagre oxygen, combustion process there will be a part of uncompleted burned carbon hydrogen compound and CO; Flue gas containing uncompleted burned carbon hydrogen compound and CO, when the temperature of the flue gas of convection cell outlet containing uncompleted burned carbon hydrogen compound and CO is lower than 450 DEG C, directly enters catalytic oxidizer; When the temperature that convection cell outlet contains the flue gas of uncompleted burned carbon hydrogen compound and CO is spent higher than 450 DEG C, after high-temperature air preheater, cool the temperature to after below 450 DEG C and enter catalytic oxidizer again;
Another road combustion air that air blast bloats, by passing into catalytic oxidizer after catalytic oxidizer air conditioning valve regulation, utilizes the oxygen in catalyst and air that the unburned hydrocarbon in flue gas and CO are oxidized to CO in catalytic oxidizer
2and H
2o, the heat that oxidation generates directly improves flue-gas temperature; The flue gas generated in catalytic oxidizer, by after catalytic oxidizer, under the effect of air-introduced machine, entering low air preheater to carrying out waste heat recovery with after improving furnace thermal efficiency, being discharged by chimney.
Beneficial effect is:
Compared with denitrating flue gas, directly control NO_x formation by combustion with meagre oxygen, there is not the escaping of ammonia, there is no secondary pollution.This utility model is applicable to the heating-furnace bore temperature of various operating mode, and the heating furnace of various load can adopt.Strong adaptability.Heating furnace can control to work under low excess air coefficient condition, reduces heating furnace heat loss, improves heater efficiency.Catalytic oxidizer can carry out oxidation Decomposition to the combustible component in flue gas completely, and reaction heat makes full use of, and there is not the situation that combustible component exceeds standard.Make full use of low oxygen combustion and control NO_x formation, make the nitrogen oxide in fume emission reach below 10ppm.The utility model to realize in the device of the ultralow discharged nitrous oxides of heating furnace in catalytic oxidizer exiting flue gas Control for Oxygen Content in butt oxygen content 3%.In catalytic oxidizer exiting flue gas, CO content is lower than 50ppm.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1 of the present utility model;
Fig. 2 is the structural representation of embodiment 2 of the present utility model;
Fig. 3 is that oxygen concentration is to NO in combustion product
xthe effect diagram formed;
In figure, mark is: 1, chimney, 2, and convection cell, 3, radiation chamber, 4, burner, 5, catalytic oxidizer, 6, air blast, 7, air-introduced machine, 8, air preheater, 8-1, high-temperature air preheater; 8-2, low-temperature air preheater, 9, catalytic oxidizer air control valve, 10, burner combustion air control valve.
Detailed description of the invention
As shown in the figure, a kind of device realizing the ultralow discharged nitrous oxides of heating furnace, this device comprises chimney 1, convection cell 2, radiation chamber 3, burner 4, air blast 6, air-introduced machine 7 and air preheater 8; Be provided with convection cell below described chimney, convection cell communicates with radiation chamber; Burner is provided with in radiation chamber; Described burner is connected by air channel with air preheater, and air-introduced machine is connected by air channel with air preheater; Air preheater is connected with chimney by flue;
Described air preheater entrance is or/and exit is provided with catalytic oxidizer 5; Described air blast is combustion blower, respectively air supply preheater and catalytic oxidizer air supply; Air channel for catalytic oxidizer air feed is provided with the burner combustion air control valve 10 controlling supply combustion-supporting air quantity; The air channel that described burner is connected with air preheater is provided with catalytic oxidizer air control valve; Burner described in 9 is low nitrogen oxide burner.
During convection cell exit gas temperature less than 450 DEG C, described catalytic oxidizer 5 is arranged on convection cell 2 and exports between air preheater 8 entrance, utilizes uncombusted hydro carbons and carbon monoxide in catalyst oxidation flue gas.Described catalytic oxidizer is arranged between convection cell outlet and air preheater entrance.
During convection cell exit gas temperature more than 450 DEG C, described air preheater 8 comprises high-temperature air preheater 8-1 and low-temperature air preheater 8-2; Described catalytic oxidizer 5 is arranged between high-temperature air preheater and low-temperature air preheater.At convection cell outlet high-temperature air preheater, when flue-gas temperature being down to below 450 DEG C, then through catalytic oxidizer, after catalytic oxidizer, recycling low-temperature air preheater carry out waste heat recovery, improve furnace thermal efficiency.
Utilize the described discharge technology realizing the device of the ultralow discharged nitrous oxides of heating furnace, technical process is as follows: air blast 6 provides combustion air for burner; The combustion air that air blast bloats is divided into two-way, a road combustion air by after air preheater through control valve, allocate low nitrogen oxide burner into according to equivalent or secondary equivalent; In radiation chamber, complete the burning with fuel, burn for combustion with meagre oxygen, reduce partial pressure of oxygen, the thermodynamics nitrogen oxide that effective control combustion produces; The heated medium of the hot heating radiation indoor that burning produces; Due to combustion with meagre oxygen, combustion process there will be a part of uncompleted burned carbon hydrogen compound and CO; Flue gas containing uncompleted burned carbon hydrogen compound and CO, when convection cell exit gas temperature is lower than 450 DEG C, directly enters catalytic oxidizer 5; When convection cell exit gas temperature is spent higher than 450 DEG C, after high-temperature air preheater 8-1, cool the temperature to after below 450 DEG C and enter catalytic oxidizer 5 again;
Another road combustion air that air blast bloats passes into catalytic oxidizer 5 after being regulated by catalytic oxidizer air control valve 9, utilizes the oxygen in catalyst and air that the unburned hydrocarbon in flue gas and CO are oxidized to CO in catalytic oxidizer
2and H
2o, the heat that oxidation generates directly improves flue-gas temperature; The flue gas generated in catalytic oxidizer, by after catalytic oxidizer 5, under the effect of air-introduced machine 7, entering low air preheater 8-2 to carrying out waste heat recovery with after improving furnace thermal efficiency, being discharged by chimney 1.
embodiment 1
As shown in Figure 1, the device realizing the ultralow discharged nitrous oxides of heating furnace comprises chimney 1, convection cell 2, radiation chamber 3, burner 4, air blast 6, air-introduced machine 7 and air preheater 8; Be provided with convection cell below described chimney, convection cell communicates with radiation chamber; Burner is provided with in radiation chamber; Described burner is connected by air channel with air preheater, and air-introduced machine is connected by air channel with air preheater; Air preheater is connected with chimney by flue;
Described air preheater entrance is or/and exit is provided with catalytic oxidizer 5; Described air blast is combustion blower, respectively air supply preheater and catalytic oxidizer air supply; Air channel for catalytic oxidizer air feed is provided with the burner combustion air control valve 10 controlling supply combustion-supporting air quantity; The air channel that described burner is connected with air preheater is provided with catalytic oxidizer air control valve; Burner described in 9 is low nitrogen oxide burner.
During convection cell exit gas temperature less than 450 DEG C, described catalytic oxidizer 5 is arranged on convection cell 2 and exports between air preheater 8 entrance, utilizes uncombusted hydro carbons and carbon monoxide in catalyst oxidation flue gas.Described catalytic oxidizer is arranged between convection cell outlet and air preheater entrance.
Utilize the described discharge technology realizing the device of the ultralow discharged nitrous oxides of heating furnace, technical process is as follows: air blast 6 provides combustion air for burner; The combustion air that air blast bloats is divided into two-way, a road combustion air by after air preheater through control valve, allocate low nitrogen oxide burner into according to equivalent or secondary equivalent; In radiation chamber, complete the burning with fuel, burn for combustion with meagre oxygen, reduce partial pressure of oxygen, the thermodynamics nitrogen oxide that effective control combustion produces; The heated medium of the hot heating radiation indoor that burning produces; Due to combustion with meagre oxygen, combustion process there will be a part of uncompleted burned carbon hydrogen compound and CO; Flue gas containing uncompleted burned carbon hydrogen compound and CO, convection cell exit gas temperature, lower than 450 DEG C, directly enters catalytic oxidizer 5; Another road combustion air that air blast bloats passes into catalytic oxidizer 5 after being regulated by catalytic oxidizer air control valve 9, utilizes the oxygen in catalyst and air that the unburned hydrocarbon in flue gas and CO are oxidized to CO in catalytic oxidizer
2and H
2o, the heat that oxidation generates directly improves flue-gas temperature; The flue gas generated in catalytic oxidizer, by after catalytic oxidizer 5, under the effect of air-introduced machine 7, entering low air preheater 8-2 to carrying out waste heat recovery with after improving furnace thermal efficiency, being discharged by chimney 1.
embodiment 2
As shown in Figure 2, a kind of device realizing the ultralow discharged nitrous oxides of heating furnace, this device comprises chimney, convection cell, radiation chamber, burner, air blast, air-introduced machine and air preheater; Be provided with convection cell below described chimney, convection cell communicates with radiation chamber; Burner is provided with in radiation chamber; Described burner is connected by air channel with air preheater, and air-introduced machine is connected by air channel with air preheater; Air preheater is connected with chimney by flue;
Described air preheater entrance is or/and exit is provided with catalytic oxidizer; Described air blast is combustion blower, respectively air supply preheater and catalytic oxidizer air supply; Air channel for catalytic oxidizer air feed is provided with the burner combustion air control valve controlling supply combustion-supporting air quantity; The air channel that described burner is connected with air preheater is provided with catalytic oxidizer air control valve; Described burner is low nitrogen oxide burner.
During convection cell exit gas temperature more than 450 DEG C, described air preheater 8 comprises high-temperature air preheater 8-1 and low-temperature air preheater 8-2; Described catalytic oxidizer 5 is arranged between high-temperature air preheater and low-temperature air preheater.At convection cell outlet high-temperature air preheater, when flue-gas temperature being down to below 450 DEG C, then through catalytic oxidizer, after catalytic oxidizer, recycling low-temperature air preheater carry out waste heat recovery, improve furnace thermal efficiency.
Utilize the described discharge technology realizing the device of the ultralow discharged nitrous oxides of heating furnace, technical process is as follows: air blast 6 provides combustion air for burner; The combustion air that air blast bloats is divided into two-way, a road combustion air by after air preheater through control valve, allocate low nitrogen oxide burner into according to equivalent or secondary equivalent; In radiation chamber, complete the burning with fuel, burn for combustion with meagre oxygen, reduce partial pressure of oxygen, the thermodynamics nitrogen oxide that effective control combustion produces; The heated medium of the hot heating radiation indoor that burning produces; Due to combustion with meagre oxygen, combustion process there will be a part of uncompleted burned carbon hydrogen compound and CO; Flue gas containing uncompleted burned carbon hydrogen compound and CO; Convection cell exit gas temperature, higher than 450 DEG C of degree, after high-temperature air preheater 8-1, cools the temperature to after below 450 DEG C and enters catalytic oxidizer 5 again;
Another road combustion air that air blast bloats passes into catalytic oxidizer 5 after being regulated by catalytic oxidizer air control valve 9, utilizes the oxygen in catalyst and air that the unburned hydrocarbon in flue gas and CO are oxidized to CO in catalytic oxidizer
2and H
2o, the heat that oxidation generates directly improves flue-gas temperature; The flue gas generated in catalytic oxidizer, by after catalytic oxidizer 5, under the effect of air-introduced machine 7, entering low air preheater 8-2 to carrying out waste heat recovery with after improving furnace thermal efficiency, being discharged by chimney 1.
operation principle of the present utility model:
Heating furnace of the present utility model adopts conventional low nitrogen oxide burner, and air blast provides combustion air for burner, and the combustion air that air blast bloats first by air preheater preheating, then is sent into burner for fuel combustion and provided oxygen.The amount of burner combustion air relies on control valve to regulate, and burner controls under equivalent or secondary equivalent condition, and burner combustion is equivalent burning or micro-oxygen debt burning.
Mainly be divided three classes according to the mechanism that nitrogen oxide in combustion process produces: 1. fuel type NOx: the NOx that the fixed nitrogen in fuel generates.2. thermal NO x: N under high temperature
2with O
2the NOx that reaction generates.3. instantaneous NO: the NO owing to generating containing the existence of carbon radicals under cold flame.Wherein main based on thermodynamics nitrogen oxide in fuel gas buring.Affect the factor that NOx is formed: 1. air-fuel ratio; 2. combustion zone temperature and distribution thereof; 3. the cooling degree in after-combustion district; 4. burner form.
The nitrogen oxide that the utility model utilizes low air process factor running technology (low oxygen combustion) control combustion to produce.When flue gas butt oxygen content 3% and equivalent burning, nitrogen oxide emission reduces about 2 times as seen in Figure 3.NO
xdischarge capacity reduces along with the minimizing of excess air, in order to reduce NO
xdischarge capacity, heating furnace runs under the operating mode that excess air is lower.Adopt low coefficient of excess air running technology, not only can reduce NO
xdischarge, and decrease heating furnace heat loss due to exhaust gas, can thermal efficiency of heating furnace be improved.
Thermal efficiency of heating furnace is improved while reducing NOx; CO, hydrocarbon uncombusted material can increase, and in order to improve heater efficiency further, the catalytic oxidizer that the CO in flue gas, hydrocarbon uncombusted material are arranged by the utility model is fully oxidized resolves into CO
2and H
2o, the heat of oxidation Decomposition improves self flue-gas temperature.Because burning adopts (low oxygen combustion/combustion with meagre oxygen), unnecessary oxygen or the oxygen of trace is there is not in combustion product gases, CO in catalytic oxidizer oxidation flue gas, the oxygen of hydrocarbon uncombusted material demand are provided by air blast, adjust flux is carried out by control valve 9, chimney outlet carries out flue gas and detects in real time, if CO appears in detected value, hydrocarbon exceeds standard, feedback signal directly controls to adjust valve opening.The oxygen that strict control catalytic oxidation needs.Final with oxygen concentration in flue gas 1%, or CO volume fraction is the selection gist of 50ppm as minimum excess air coefficient.
Oxygen content of smoke gas is down to 1%(butt) comparatively oxygen content of smoke gas be down to 3%(butt) heater efficiency about 1% can be improved, nitrogen oxide can reduce about 50%, if adopt low nitrogen oxide burner, nitrogen oxide can control to below 10ppm.Catalytic oxidizer adopts catalytic combustion that fuel can be made to realize at a lower temperature burning completely.
Claims (3)
1. one kind realizes the device of the ultralow discharged nitrous oxides of heating furnace, this device comprises chimney (1), convection cell (2), radiation chamber (3), burner (4), air blast (6), air-introduced machine (7) and air preheater (8), it is characterized in that: be provided with convection cell below described chimney, convection cell communicates with radiation chamber; Burner is provided with in radiation chamber; Described burner is connected by air channel with air preheater, and air-introduced machine is connected by air channel with air preheater; Air preheater is connected with chimney by flue; Described air preheater entrance is or/and exit is provided with catalytic oxidizer (5); Described air blast is combustion blower, respectively air supply preheater and catalytic oxidizer air supply; Air channel for catalytic oxidizer air feed is provided with the burner combustion air control valve (10) controlling supply combustion-supporting air quantity; The air channel that described burner is connected with air preheater is provided with catalytic oxidizer air control valve (9); Described burner is low nitrogen oxide burner.
2. realize the device of the ultralow discharged nitrous oxides of heating furnace as claimed in claim 1, it is characterized in that: described catalytic oxidizer (5) is arranged between convection cell (2) outlet and air preheater (8) entrance.
3. realize the device of the ultralow discharged nitrous oxides of heating furnace as claimed in claim 1, it is characterized in that: described air preheater (8) comprises high-temperature air preheater (8-1) and low-temperature air preheater (8-2); Described catalytic oxidizer (5) is arranged between high-temperature air preheater and low-temperature air preheater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520671599.1U CN204923923U (en) | 2015-09-01 | 2015-09-01 | Realize device of ultralow nitrogen oxide of heating furnace emission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520671599.1U CN204923923U (en) | 2015-09-01 | 2015-09-01 | Realize device of ultralow nitrogen oxide of heating furnace emission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115309A (en) * | 2015-09-01 | 2015-12-02 | 洛阳瑞昌石油化工设备有限公司 | Device for achieving ultralow nitrogen oxide emission of heating furnace and process thereof |
| CN110531027A (en) * | 2018-05-28 | 2019-12-03 | 广东韶钢松山股份有限公司 | A kind of blast-furnace hot-air producer gas abnormal component diagnostic method |
-
2015
- 2015-09-01 CN CN201520671599.1U patent/CN204923923U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115309A (en) * | 2015-09-01 | 2015-12-02 | 洛阳瑞昌石油化工设备有限公司 | Device for achieving ultralow nitrogen oxide emission of heating furnace and process thereof |
| CN110531027A (en) * | 2018-05-28 | 2019-12-03 | 广东韶钢松山股份有限公司 | A kind of blast-furnace hot-air producer gas abnormal component diagnostic method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 471000 No. 8, Yan Guang road, high and new technology development zone, Luoyang, Henan Patentee after: Luoyang Ruichang Environmental Engineering Co., Ltd. Address before: 471000 No. 8, Yan Guang road, high and new technology development zone, Luoyang, Henan Patentee before: Luoyang Ruichang Petrochemical Equipment Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |