CN217877178U - Double-heat-storage heating furnace combustion control system - Google Patents
Double-heat-storage heating furnace combustion control system Download PDFInfo
- Publication number
- CN217877178U CN217877178U CN202221979085.9U CN202221979085U CN217877178U CN 217877178 U CN217877178 U CN 217877178U CN 202221979085 U CN202221979085 U CN 202221979085U CN 217877178 U CN217877178 U CN 217877178U
- Authority
- CN
- China
- Prior art keywords
- air
- heat
- pipeline
- accumulating type
- heat accumulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Abstract
The utility model discloses a two heat accumulation heating furnace control combustion system. The system at least comprises a heat supply section, wherein more than two groups of heat accumulating type burners arranged in pairs are arranged in the heat supply section; each pair of heat accumulating type burners consists of an air heat accumulating type burner and a coal gas heat accumulating type burner, and each air heat accumulating type burner is connected with an air inlet pipeline and an air exhaust pipeline through a switching valve; each coal gas heat accumulating type burner is connected with a coal gas inlet pipeline and a coal gas exhaust pipeline through a switching valve; wherein, a residual oxygen amount detection device is arranged in the air smoke exhaust pipeline or the gas smoke exhaust pipeline; and the control device controls the air inflow of the air pipeline according to the detection value of the residual oxygen amount detection device. The utility model discloses installed the incomplete oxygen check out test set of flue gas on each section exhaust pipe, the incomplete oxygen volume in the real-time detection pipeline utilizes the incomplete oxygen value reverse tracking control air regulating valve's that detects aperture, and the coal gas governing valve is then the orientation to be tracked each section and set for the furnace temperature and supply heat.
Description
Technical Field
The utility model relates to a blast furnace gas double heat accumulation total dispersion switching-over control heating furnace residual oxygen value reverse tracking control combustion system technology, the "air-fuel ratio" of accurate regulation and control air, blast furnace gas effectively reduces the lower oxidation loss of burning of steel billet after the stove is gone into to continuous casting heat-transfer red base (600-850 ℃), reduces the incomplete combustion of coal gas and polluted environment, realizes energy saving and consumption reduction when improving steel billet temperature homogeneity simultaneously.
Background
With the requirements of development of the steel industry and energy conservation and environmental protection, particularly the requirements of carbon neutralization and carbon peak reaching, higher requirements on energy conservation, environmental protection and consumption reduction of the steel industry are provided. Therefore, the continuous casting billet red-feeding hot-charging heating furnace in the steel rolling workshop gradually becomes the standard of steel enterprises.
The steel billet can generate iron scale in the heating furnace, the tissue of the steel is damaged, the oxide layer removing process is added, and the metal yield in the steel production process is reduced to a great extent. The oxidation burning loss rate of the steel billet in the domestic hot rolling heating furnace is approximately 0.5-1.5%, and the oxidation burning loss rate of the foreign steel rolling heating furnace is generally controlled to be about 0.5%.
Particularly, when the continuous casting hot-conveying red billet heating furnace is used for production, the feeding temperature of the billet is 750-850 ℃, and the internal temperature of the billet is 800-950 ℃, so that the temperature of the billet in the furnace is only 50-150 ℃, and therefore, only two heat supply sections of the heating furnace close to the discharging end are started for heat supply. Even so, the air and gas flow of the corresponding hot section is relatively small compared with the cold-charging billet, and the pressure of the air and gas is unstable at the moment, so that the actual flow can not be accurately reflected by the detection value of the flow detection equipment such as a pore plate and a bar flowmeter. Therefore, the fluctuation of the air-fuel ratio is large, the oxidation burning loss of the steel billet is obviously increased if the air is excessive, and the success rate of the continuously cast steel billet is low; if the gas is excessively and incompletely combusted, the waste of fuel and environmental pollution are caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model aims to provide a little two heat accumulation heating furnace control combustion system of air-fuel ratio fluctuation.
In order to achieve the purpose, the utility model discloses a double regenerative heating furnace control combustion system, the system at least comprises a heat supply section, more than two groups of heat regenerative burners arranged in pairs are arranged in the heat supply section; each pair of heat accumulating type burners consists of an air heat accumulating type burner and a coal gas heat accumulating type burner, and each air heat accumulating type burner is connected with an air inlet pipeline and an air exhaust pipeline through a switching valve; each coal gas heat accumulating type burner is connected with a coal gas inlet pipeline and a coal gas exhaust pipeline through a switching valve; wherein, a residual oxygen amount detection device is arranged in the air smoke exhaust pipeline or the gas smoke exhaust pipeline;
and the control device controls the air inflow of the air pipeline according to the detection value of the residual oxygen amount detection device.
Furthermore, a controlled valve is arranged on the air smoke exhaust pipeline, and the control device controls the opening degree of the controlled valve of the air pipeline according to the detection value of the residual oxygen amount detection device.
Furthermore, a controlled flow regulating valve is arranged on the coal gas inlet pipeline, and a furnace temperature detection device is arranged in the heat supply section; and the control device controls the opening of the controlled flow regulating valve on each gas inlet pipeline according to the detection data of the furnace temperature detection device.
Furthermore, flowmeters are arranged on the gas inlet pipeline and the air inlet pipe;
the gas inlet pipeline control device also comprises a comparison module, wherein the comparison module is used for comparing the value of a flow meter of the gas inlet pipeline with a preset value and outputting a result to the control device;
and the control device selects to control the air inflow of the air pipeline according to the result of the comparison module and the detection value of the flow meter on the air inlet pipe or the detection value of the residual oxygen amount detection device.
The utility model discloses method of two regenerative heating furnace control combustion system includes the following step at least:
1) Monitoring the residual oxygen amount in a smoke exhaust pipeline in a heat supply section in real time;
2) And controlling the air inlet amount of the heat supply section by using the measured residual oxygen amount.
Further, the method also comprises the following steps: 3) A flow regulating valve on the gas pipeline directionally tracks the set furnace temperature interval value A of the heat supply section, and data detected by a flow meter on the gas pipeline is used as a basis for starting the number of the air and gas heat storage burner groups in the section.
Further, the data detected by the flowmeter on the gas pipeline is used as the basis for starting the number of the air and gas heat accumulation burner groups at the section, and the method comprises the following steps:
set gas pipeline flow detection value Q Measuring /Q Forehead (forehead) ＝a：
(1) When a is more than or equal to 40%, the 3 groups of heat accumulating type burners work;
(2) when the content of a is more than or equal to 40% and more than or equal to 20%, the section 2 of the heat accumulating type burners work;
(3) when the rate is more than or equal to 20 percent and more than or equal to a and more than or equal to 0, the section 1 of the regenerative burners works.
Further, before step 1), the method further comprises:
detecting the flow value of a flowmeter on the heat supply section gas pipeline in real time, comparing the flow value with the total amount of the section gas burner, and if the ratio is smaller than a preset value, turning to the step 1); if the ratio is larger than the preset value, the air inlet quantity of the heating section is controlled by using the data detected by the flowmeter of the air inlet pipe.
Further, the method comprises the following steps: 4) The flow value detected by the flowmeter on the gas pipeline is compared with the total quota of the gas burner at the section, so that the heat supply capacity of the heat storage burner (8) is more than or equal to 20% of the rated capacity.
The utility model discloses installed the incomplete oxygen check out test set of flue gas on each section air exhaust pipe, the incomplete oxygen volume in the real-time detection air smoke pipeline utilizes the incomplete oxygen value reverse tracking control air regulating valve's that detects aperture, and the coal gas governing valve is then the orientation to be tracked each section and set for the furnace temperature and supply heat. Instead of simply tracking the gas flow detection value in proportion to the air flow detection value. Thereby the fluctuation of the air-fuel ratio is smaller, the oxidation burning loss of the used steel billet is obviously reduced, and the success rate of the continuous casting of the steel billet is high; effectively preventing the waste of fuel and environmental pollution.
Drawings
Fig. 1 is a diagram of a combustion system according to an embodiment of the present invention.
The device comprises an air pipeline (1), a flue gas pipeline (2), a gas pipeline (3), a soot pipeline (4), residual oxygen detection equipment (5), a flow control valve (6), a flowmeter (7), a heat storage burner (8), a two-position three-way reversing valve (9), a gas side induced draft fan (101), a gas side chimney (102), an air side induced draft fan (201) and an air side chimney (202).
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
When the air-gas double heat accumulating type heating furnace is used for producing continuous casting hot-conveying red billets, the feeding temperature of the billets is 750-850 ℃, the air flow and the gas flow are small, and the pressure of air and the gas is unstable, so that the real flow cannot be accurately reflected by the detection value of each section of flow meter. Therefore, the fluctuation of the air-fuel ratio is large, if the air is excessive, the oxidation burning loss of the steel billet is increased, and the success rate of the continuous casting of the steel billet is low; if the gas is excessive and is not completely combusted, the waste of fuel and environmental pollution are caused.
The orifice plate flowmeter turndown ratio commonly used by us is typically 3:1, when the detection value of the orifice plate flowmeter is below 30%, the actual flow of air and coal gas cannot be truly reflected. And when the heating furnace produces the continuous casting hot-conveying red blank, the flow of the air and gas flow meter is low and basically below 30 percent of the measured value, and the actual flow cannot be reflected.
Fig. 1 is an embodiment of the present invention, which is described by taking an air-gas double heat accumulation type step heating furnace with four heat supplies in a soaking section, a first heating section, a second heating section and a preheating section as an example to produce a continuous casting hot-feeding red billet:
the utility model discloses an implementation mainly includes following content: the device comprises main components such as an air pipeline (1), a hollow smoke pipeline (2), a gas pipeline (3), a soot pipeline (4), a residual oxygen analyzer (5), a flow regulating valve (6), a flow meter (7), a heat storage burner (8), a two-position three-way reversing valve (9) and the like.
Residual oxygen analyzers (5) are mounted on the heat supply branch pipe section air smoke pipelines (2) connected with the air smoke induced draft fan to monitor the residual oxygen amount in the air smoke pipelines in real time.
The data monitored by the residual oxygen analyzer (5) in real time is used as the oxygen content value of the section of the air flue pipe (2) to be compared with a set value, and then the flow regulating valve (6) of the section of the air flue pipe (1) connected with the air blower is reversely tracked and controlled. The data detected by the air flow meter (7) on the air pipeline (1) is only used as a reference and does not participate in the control.
In the attached figure, 3 groups of air and gas heat accumulation burners are respectively arranged on one side of each heat supply section of the double heat accumulation heating furnace, the upper air heat accumulation burner and the lower air heat accumulation burner are respectively controlled by one set of two-position three-way reversing valve, namely, the upper air heat accumulation burner and the lower air heat accumulation burner are controlled by one set of air two-position three-way reversing valve, and the same is true for the gas heat accumulation burner. The upper air and the upper coal gas heat accumulation burner are paired for combustion. The heat supply process comprises the steps of burning one side of the furnace body and exhausting smoke from the other side of the furnace body, and the furnace body alternately work.
Therefore, the temperature regulation of each heating section in the attached figure directionally tracks the set furnace temperature interval value (plus or minus 15 ℃) of the section through the flow regulating valve (6) on the gas pipeline (3), and the flow meter on the pipeline measures and detects flow data in real time, and the data is used as the basis for opening 1 group, 2 group or 3 group of the air and gas heat accumulation burners (8) of the section.
Taking 3 groups of regenerative burners in each section in the attached drawing as an example, a gas pipeline flow detection value Qmeasure/Qamount = a is specified, wherein Qmeasure is a real-time detection value, and Qamount is a total rated value of the design burner capacity of the section.
(1) When a is more than or equal to 40%, the 3 groups of heat accumulating type burners work;
(2) when the content of a is more than or equal to 40% and more than or equal to 20%, the section 2 of the heat accumulating type burners work;
(3) when the ratio of a to a is more than or equal to 0% by 20%, the section 1 of heat accumulating type burners work;
the heat accumulation burners which are opened for ensuring the temperature uniformity of the hearth in the section adopt a section internal circulation alternate working system. When a is more than or equal to 40%, the detection value of the flow meter on the air and gas pipeline is more accurate, and a conventional combustion control technology is adopted; when the content of 30% is more than or equal to a and more than or equal to 0%, the detection value of the flow meter on the air and gas pipeline is inaccurate, the temperature regulation of each heating section directionally tracks the set furnace temperature interval value of the section through the flow regulating valve on the gas pipeline, and the residual oxygen detection equipment on each section of the air pipeline reversely tracks and controls the flow regulating valve on the air pipeline to regulate the air flow in real time. The problem that the environment is polluted due to oxidation burning loss of the steel billet or incomplete combustion of the coal gas is solved by the measures.
As another embodiment of the utility model, for the homogeneity that improves furnace temperature, ensure that the regenerative burner is in reasonable operating condition relatively, the flow value that the flowmeter detected on the gas pipeline is compared with this section gas burner gross quota ration, makes the heating capacity of regenerative burner more than or equal to 20% of rated capacity as far as possible.
Specifically, the following description is provided: when the heat value or pressure fluctuation of the gas is larger, the control mode can be adopted to reduce the oxidation burning loss of the steel billet and protect the environment.
The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A double-heat-storage heating furnace control combustion system is characterized by at least comprising a heat supply section, wherein more than two groups of heat storage type burners arranged in pairs are arranged in the heat supply section; each pair of heat accumulating type burners consists of an air heat accumulating type burner and a coal gas heat accumulating type burner, and each air heat accumulating type burner is connected with an air inlet pipeline and an air exhaust pipeline through a switching valve; each coal gas heat accumulating type burner is connected with a coal gas inlet pipeline and a coal gas exhaust pipeline through a switching valve; wherein, a residual oxygen amount detection device is arranged in the air smoke exhaust pipeline or the gas smoke exhaust pipeline;
and the control device controls the air inflow of the air pipeline according to the detection value of the residual oxygen amount detection device.
2. A controlled combustion system for a double regenerative furnace according to claim 1, wherein said air discharge flue is provided with a controlled flow control valve, and said control means controls the opening of said controlled flow control valve of said air flue based on the value detected by said residual oxygen amount detecting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221979085.9U CN217877178U (en) | 2022-07-28 | 2022-07-28 | Double-heat-storage heating furnace combustion control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221979085.9U CN217877178U (en) | 2022-07-28 | 2022-07-28 | Double-heat-storage heating furnace combustion control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217877178U true CN217877178U (en) | 2022-11-22 |
Family
ID=84057004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221979085.9U Active CN217877178U (en) | 2022-07-28 | 2022-07-28 | Double-heat-storage heating furnace combustion control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217877178U (en) |
-
2022
- 2022-07-28 CN CN202221979085.9U patent/CN217877178U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101118127B (en) | Full pre-mix condensing heating hot-water dual-purpose device | |
| CN103062790B (en) | Heating furnace combustion control method | |
| CN109269117B (en) | Method for determining operating state of heating furnace | |
| CN111396920A (en) | Thermal power generating unit and boiler combustion monitoring method and system based on CO measurement | |
| CN107166429A (en) | A kind of boiler furnace flame central position monitoring method | |
| CN104848247B (en) | A kind of furnace atmosphere station control system | |
| CN103712468A (en) | Combustion control system and method for lowering oxygenation burning losses of industrial furnace | |
| CN219433488U (en) | Hot-blast stove for pre-carbonization rotary kiln system | |
| CN101055090A (en) | Combustion quality analysis and control system for industrial kiln | |
| CN217877178U (en) | Double-heat-storage heating furnace combustion control system | |
| CN115341054A (en) | Method for reversely tracking and controlling combustion system by residual oxygen value of flue gas of double heat storage heating furnaces | |
| CN110017501B (en) | Control method for improving combustion efficiency of heat storage tank | |
| CN201062796Y (en) | Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace | |
| CN216845732U (en) | Double-heat-storage intelligent diagnosis combustion system | |
| WO2022088687A1 (en) | Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler | |
| CN205316379U (en) | Boiler operation oxygen volume automatic control system and boiler | |
| CN212988001U (en) | Combustion control system suitable for heat accumulating type smelting furnace | |
| CN113032970A (en) | Method and system for measuring oxygen content of flue gas of power station | |
| CN209341609U (en) | A kind of warm bath dual-purpose stove of novel low nitrogen condensed type combustion gas | |
| CN204006086U (en) | One can be controlled hydrogen manufacturing conversion furnace temperature flexibly, eliminates the air preheater of afterbody corrosion | |
| CN220867461U (en) | Low-gas-consumption gas baking system of iron-mixing furnace | |
| CN219367612U (en) | Low NOx combustion system of heating furnace | |
| KR100804230B1 (en) | Combustion control method for hot stove of blast furnace | |
| JP3500686B2 (en) | Operating method of cogeneration system | |
| CN201680699U (en) | Energy-saving reverberating furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |