CN216924412U - Oxygen conveying system for oxygen-enriched ignition of sintering machine - Google Patents
Oxygen conveying system for oxygen-enriched ignition of sintering machine Download PDFInfo
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- CN216924412U CN216924412U CN202220468094.5U CN202220468094U CN216924412U CN 216924412 U CN216924412 U CN 216924412U CN 202220468094 U CN202220468094 U CN 202220468094U CN 216924412 U CN216924412 U CN 216924412U
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- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model relates to an oxygen conveying system for oxygen-enriched ignition of a sintering machine, which comprises an oxygen conveying pipeline arranged between an oxygen main pipeline and an air-oxygen mixer; the oxygen conveying pipeline is sequentially provided with a stop valve A, a stop valve B, a flowmeter, a pressure gauge I, a pressure regulating valve group, a flow regulating valve group, a stop valve C, an oxygen flame arrester, an oxygen fast-cutting valve, an orifice plate flowmeter, a dispersion port, a safety valve, a pressure gauge II and a check valve along the oxygen conveying direction; the diffusing port is connected with a diffusing pipeline, and a diffusing valve is arranged on the diffusing pipeline. The utility model reduces the pressure and stabilizes the flow of oxygen from the oxygen main pipe, and then sends the oxygen into the air-oxygen mixer to mix with air, so as to evenly and stably send combustion-supporting gas for the igniter, and realize effective oxygen-enriched ignition, thereby improving the combustion temperature of low-heat value gas and strengthening the ignition effect of the sintering charge level.
Description
Technical Field
The utility model relates to the technical field of iron ore sintering, in particular to an oxygen conveying system for oxygen-enriched ignition of a sintering machine.
Background
The sintering ignition energy consumption accounts for about 10% of the total sintering energy consumption; at present, the number of iron and steel enterprises provided with coking plants in China is only 70, and most of the coking plants are independent coking plants, so that most of ignition gas used for producing sintered ores by the iron and steel enterprises is blast furnace gas, converter gas or mixed gas of the blast furnace gas and the converter gas. Compared with the ignition sintering by using coke oven gas, the ignition sintering by using the low-heat value gas has the advantages that the quality of surface sintering ores is poorer, and the ignition quality is ensured, the ignition sintering is usually carried out at higher gas consumption. On one hand, the coal gas consumption in the sintering process is high (20-30 m)3Iron ore/t) and on the other hand, increases the unburned gas fraction, resulting in a higher CO content (up to 2 ppm or more) in the windbox in the front of the sintering machine, and thus in an increased CO content of the sintering waste gas. Therefore, for the sintering machine adopting low-heating value gas for ignition, effective measures for reducing the consumption of sintering gas and reducing the emission of pollutants are very necessary.
Practice shows that the combustion efficiency of the low-heat value gas can be effectively improved through oxygen-enriched ignition, so that the consumption of ignition gas is reduced, and the CO generation amount in the ignition process is reduced. The oxygen-enriched ignition is to introduce mixed gas of oxygen and air into an igniter (burner) to increase the oxygen content of combustion-supporting air in the igniter, thereby increasing the combustion temperature of low-heat value gas and strengthening the ignition effect of a sintered charge level. The oxygen and the air are uniformly mixed by a mixer according to a certain proportion and then are fed into the igniter. The oxygen pressure and flow introduced into the mixer directly influence the mixing effect of the gas, namely the oxygen-enriched ignition effect; the large proportion of oxygen can cause the flame temperature in the igniter to be higher and the reaction to be too violent; and if the oxygen proportion is small, the flame temperature is low, and the reaction is too mild. If the fluctuation of the oxygen pressure and flow is large, the ignition effect is poor due to the unstable flame.
Disclosure of Invention
The utility model provides an oxygen conveying system for oxygen-enriched ignition of a sintering machine, which is characterized in that oxygen from an oxygen main pipeline is decompressed and stabilized and then is fed into an air-oxygen mixer to be mixed with air, so that combustion-supporting gas is uniformly and stably conveyed to an igniter, effective oxygen-enriched ignition is realized, the combustion temperature of low-calorific-value gas is increased, and the ignition effect of a sintering charge level is enhanced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an oxygen conveying system for oxygen-enriched ignition of a sintering machine comprises an oxygen conveying pipeline arranged between an oxygen main pipeline and an air-oxygen mixer; the oxygen conveying pipeline is sequentially provided with a stop valve A, a stop valve B, a flowmeter, a pressure gauge I, a pressure regulating valve group, a flow regulating valve group, a stop valve C, an oxygen flame arrester, an oxygen quick-cutting valve, an orifice plate flowmeter, a dispersion port, a safety valve, a pressure gauge II and a check valve along the oxygen conveying direction; the bleeding opening is connected with a bleeding pipeline, and a bleeding valve is arranged on the bleeding pipeline.
An explosion-proof wall is arranged on the periphery of the oxygen conveying pipeline from the upstream of the stop valve B to the downstream of the diffusion port.
The oxygen conveying pipeline at the upstream of the stop valve B is a carbon steel pipeline, and the oxygen conveying pipeline at the downstream of the stop valve B is a stainless steel pipeline.
The pressure regulating valve group and the flow regulating valve group are made of stainless steel.
The nominal diameter of the oxygen delivery pipeline at the upstream of the pressure regulating valve group is DN50, the nominal diameter of the oxygen delivery pipeline at the downstream of the flow regulating valve group is DN100, and the nominal diameters of the bleeding valve and the safety valve are DN 32.
The air-oxygen mixer is internally provided with an oxygen content tester, the air-oxygen mixer is additionally connected with an air conveying pipeline, and the air conveying pipeline is provided with a gate valve at the position close to the air-oxygen mixer.
An oxygen conveying system for oxygen-enriched ignition of a sintering machine also comprises a PLC control system; the orifice plate flowmeter and the flow regulating valve group are controlled in an interlocking manner through a PLC control system, and the second pressure gauge and the pressure regulating valve group are controlled in an interlocking manner through the PLC control system; and the PLC control system is in communication connection with the sintering main control system.
Compared with the prior art, the utility model has the beneficial effects that:
1) the oxygen from the oxygen main pipeline is decompressed and stabilized and then is sent into the air-oxygen mixer to be mixed with the air, so as to evenly and stably send combustion-supporting gas for the igniter, and realize effective oxygen-enriched ignition, thereby improving the combustion temperature of low-heat value gas and strengthening the ignition effect of the sintering charge level.
2) The oxygen delivery system is ensured to have reliable safety by the measures of arranging an oxygen flame arrester, a bleeding valve, a safety valve, an explosion-proof wall and the like;
3) the automatic control can be conveniently realized through the control system, and the monitoring and remote operation functions of the system can be realized after related control pictures are additionally arranged in the sintering main control chamber.
Drawings
FIG. 1 is a schematic diagram of the oxygen delivery system for oxygen-rich ignition of a sintering machine according to the present invention.
In the figure: 1. the oxygen main pipeline 2, the oxygen delivery pipeline 3, the stop valve A4, the stop valve B5, the flowmeter 6, the pressure gauge I7, the pressure regulating valve group 8, the flow regulating valve group 9, the stop valve C10, the oxygen flame arrester 11, the oxygen fast-cutting valve 12, the orifice plate flowmeter 13, the relief valve 14, the safety valve 15, the pressure gauge II 16, the check valve 17, the air-oxygen mixer 18, the oxygen content detector 19, the air delivery pipeline 20, the gate valve 21 and the explosion-proof wall
Detailed Description
The following further describes embodiments of the present invention in conjunction with the attached figures:
as shown in FIG. 1, the oxygen delivery system for oxygen-enriched ignition of a sintering machine comprises an oxygen delivery pipeline 2 arranged between an oxygen main pipeline 1 and an air-oxygen mixer 17; the oxygen conveying pipeline 2 is sequentially provided with a stop valve A3, a stop valve B4, a flowmeter 5, a pressure gauge I6, a pressure regulating valve group 7, a flow regulating valve group 8, a stop valve C9, an oxygen flame arrester 10, an oxygen fast-cutting valve 11, an orifice plate flowmeter 12, a dispersion port, a safety valve 14, a pressure gauge II 15 and a check valve 16 along the oxygen conveying direction; the bleeding opening is connected with a bleeding pipeline, and a bleeding valve 13 is arranged on the bleeding pipeline.
An explosion-proof wall 21 is arranged on the periphery of the oxygen conveying pipeline 2 from the upstream of the stop valve B4 to the downstream of the bleeding port.
The oxygen conveying pipeline 2 at the upstream of the stop valve B4 is a carbon steel pipeline, and the oxygen conveying pipeline 2 at the downstream of the stop valve B4 is a stainless steel pipeline.
The pressure regulating valve group 7 and the flow regulating valve group 8 are made of stainless steel.
The nominal diameter of the oxygen conveying pipeline 2 at the upstream of the pressure regulating valve group 7 is DN50, the nominal diameter of the oxygen conveying pipeline 2 at the downstream of the flow regulating valve group 8 is DN100, and the nominal diameters of the bleeding valve 13 and the safety valve 14 are DN 32.
The air-oxygen mixer 17 is internally provided with an oxygen content measuring instrument 18, the air-oxygen mixer 17 is additionally connected with an air conveying pipeline 19, and the air conveying pipeline 19 is provided with a gate valve 20 at the position close to the air-oxygen mixer 17.
An oxygen conveying system for oxygen-enriched ignition of a sintering machine also comprises a PLC control system; the orifice plate flowmeter 12 and the flow regulating valve group 8 are in interlocking control through a PLC control system, and the second pressure gauge 15 and the pressure regulating valve group 7 are in interlocking control through the PLC control system; and the PLC control system is in communication connection with the sintering main control system.
The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.
[ examples ] A
According to the national environmental protection requirement, a sintering machine of a certain steel company adopts oxygen-enriched ignition in advance, and the technological parameters are as follows:
1) gas medium for ignition: blast furnace gas;
2) ignition gas heat value: not less than 750kcal/Nm3；
3) Ignition gas consumption: 19000-21000 Nm3/h；
4) Ignition combustion air consumption: 17000-19000 Nm3/h；
5) Ignition combustion-supporting wind pressure: 7046 to 7129 Pa;
6) ignition air-fuel ratio: 0.9;
7) oxygen pressure: 1.4MPa, pure oxygen is adopted;
8) blast furnace gas contact pressure: not less than 6 KPa.
The construction content of the oxygen conveying system comprises oxygen pipeline laying from an oxygen extraction point to a sintering machine, valve installation, relevant civil engineering and steel structure construction, electric automation design and construction, system installation debugging and trial production.
The implementation target is as follows: after the pressure of oxygen at an oxygen taking point (an oxygen main pipeline) is reduced to 0.2-0.25 MPa, the oxygen is uniformly fed into an air-oxygen mixer in front of an igniter, and the oxygen content in combustion-supporting gas fed into the igniter is increased to 26% -30%.
The process parameters were controlled as follows:
| item | Unit | Numerical value | Item | Unit of | Numerical value |
| Ignition air consumption | Nm3/h | 17000～19000 | Oxygen content of sintering combustion-supporting air | ％ | 19.8 |
| Oxygen concentration | ％ | 99.2 | Sinter yield | t/h | 442.8～524.8 |
| Oxygen content of oxygen-enriched ignition combustion-supporting gas | ％ | 26～30 | Main oxygen pipeline pressure | MPa | 1.4 |
| Flow rate of oxygen in oxygen delivery pipeline | m/s | ＜20 | Oxygen pressure before entering the mixer | MPa | 0.2～0.25 |
According to the actual situation on site, a coal gas conveying pipeline at the leading-out end of the oxygen main pipeline adopts a pipeline of DN50, and oxygen after pressure and flow regulation through the pressure reducing valve bank and the flow regulating valve bank enters the air-oxygen mixer after passing through the check valve (the diameter of the pipeline is DN 100).
The main contents of the electrical design include:
1) designing a low-voltage power supply and distribution system;
2) designing an electric transmission and automatic control system;
3) lighting design, lightning protection and grounding design.
And a low-voltage distribution room is newly added in the construction area range to supply power for low-voltage electrical equipment. The newly-added PLC control system is arranged in a low-voltage distribution room, a communication cable between the PLC control system and electrical equipment is laid along original cable facilities on site, and a support is locally added (a high-voltage cable, a low-voltage cable and a control cable are required to be laid in a layered mode). And the industrial control signal of the PLC control system is accessed to the original sintering control system.
The automatic control equipment comprises: detecting and controlling an oxygen-enriched ignition system: detecting oxygen content, pressure and flow; all the detection points are introduced into a sintering main control system of a sintering machine central control chamber, and the automatic control of the whole process flow is completed.
In this embodiment, the oxygen delivery system is specifically configured as follows:
as shown in fig. 1, a stop valve a, a stop valve B, a flowmeter, a first pressure gauge, a pressure regulating valve group, a flow regulating valve group, a stop valve C, an oxygen flame arrester, an oxygen fast-cutting valve, an orifice flowmeter, a dispersion port, a safety valve, a second pressure gauge and a check valve are sequentially arranged on an oxygen conveying pipeline along an oxygen conveying direction; the bleeding opening is connected with a bleeding pipeline, and a bleeding valve is arranged on the bleeding pipeline; an explosion-proof wall is arranged on the periphery of the oxygen conveying pipeline from the upstream of the stop valve B to the downstream of the diffusion port. The oxygen conveying pipeline at the upstream of the stop valve B is a carbon steel pipeline, and the oxygen conveying pipeline at the downstream of the stop valve B is a stainless steel pipeline. The pressure regulating valve group and the flow regulating valve group are made of stainless steel. The nominal diameter of the oxygen delivery pipeline at the upstream of the pressure regulating valve group is DN50, the nominal diameter of the oxygen delivery pipeline at the downstream of the flow regulating valve group is DN100, and the nominal diameters of the bleeding valve and the safety valve are DN 32. The air-oxygen mixer is internally provided with an oxygen content tester, the air-oxygen mixer is additionally connected with an air conveying pipeline, and the air conveying pipeline is provided with a gate valve at the position close to the air-oxygen mixer. The orifice plate flowmeter and the flow regulating valve set are controlled in an interlocking mode through a PLC control system, and the pressure gauge II and the pressure regulating valve set are controlled in an interlocking mode through the PLC control system.
The valve and the detecting instrument are selected from the following types and specifications:
a stop valve A: J41W-16T DN 50;
and a stop valve B: J41W-16T DN 50;
and (3) a stop valve C: J41W-06T DN 100;
a flow meter: FPQ 50-1.6/80S;
a first pressure gauge: 0-16 MPa;
oxygen flame arrester: PN0.6MPa;
oxygen fast-cutting valve: PN0.6MPa;
orifice plate flowmeter: 0.1 to 0.25MPa,200(Min) to 1800m3/h(Max)
A relief valve: OX-DN 32;
a safety valve: A42Y-06P DN32, the opening pressure is 0.28 MPa;
a second pressure gauge: 0 to 0.6 MPa;
check valve: H41W-16T DN 100;
the implementation effect is as follows: before the oxygen-enriched ignition process is implemented, the CO content of a sintering machine head is in the level of 29500ppm, the CO content is reduced to the level of 14000ppm after the oxygen-enriched ignition process is implemented, and the CO concentration is reduced by 52 percent integrally. The CO content of 5-6 bellows is also reduced, from 20000ppm to 12000ppm, by 40%; the CO content of the 7-18 windboxes is not changed greatly before and after oxygen enrichment ignition, and is reduced from 14700ppm to 13500 ppm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (7)
1. An oxygen conveying system for oxygen-enriched ignition of a sintering machine comprises an oxygen conveying pipeline arranged between an oxygen main pipeline and an air-oxygen mixer; the oxygen conveying pipeline is characterized in that a stop valve A, a stop valve B, a flowmeter, a pressure gauge I, a pressure regulating valve group, a flow regulating valve group, a stop valve C, an oxygen flame arrester, an oxygen fast-cutting valve, an orifice plate flowmeter, a dispersion port, a safety valve, a pressure gauge II and a check valve are sequentially arranged along the oxygen conveying direction on the oxygen conveying pipeline; the bleeding opening is connected with a bleeding pipeline, and a bleeding valve is arranged on the bleeding pipeline.
2. The oxygen conveying system for oxygen-enriched ignition of the sintering machine as claimed in claim 1, wherein the periphery of the oxygen conveying pipeline from the upstream of the stop valve B to the downstream of the diffusing port is provided with an explosion-proof wall.
3. The oxygen conveying system for oxygen-enriched ignition of the sintering machine as claimed in claim 1, wherein the oxygen conveying pipeline upstream of the stop valve B is a carbon steel pipeline, and the oxygen conveying pipeline downstream of the stop valve B is a stainless steel pipeline.
4. The oxygen delivery system for oxygen-enriched ignition of a sintering machine as claimed in claim 1, wherein the pressure regulating valve set and the flow regulating valve set are made of stainless steel.
5. The oxygen delivery system for oxygen-enriched ignition of the sintering machine as claimed in claim 1, wherein the nominal diameter of the oxygen delivery pipe upstream of the pressure regulating valve group is DN50, the nominal diameter of the oxygen delivery pipe downstream of the flow regulating valve group is DN100, and the nominal diameters of the bleeding valve and the safety valve are DN 32.
6. The oxygen conveying system for oxygen-enriched ignition of the sintering machine as claimed in claim 1, wherein an oxygen content tester is arranged in the air-oxygen mixer, the air-oxygen mixer is additionally connected with an air conveying pipeline, and the air conveying pipeline is provided with a gate valve at a position close to the air-oxygen mixer.
7. The oxygen delivery system for oxygen-enriched ignition of a sintering machine according to claim 1, further comprising a PLC control system; the orifice plate flowmeter and the flow regulating valve group are controlled in an interlocking manner through a PLC control system, and the second pressure gauge and the pressure regulating valve group are controlled in an interlocking manner through the PLC control system; and the PLC control system is in communication connection with the sintering main control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220468094.5U CN216924412U (en) | 2022-03-04 | 2022-03-04 | Oxygen conveying system for oxygen-enriched ignition of sintering machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220468094.5U CN216924412U (en) | 2022-03-04 | 2022-03-04 | Oxygen conveying system for oxygen-enriched ignition of sintering machine |
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| CN216924412U true CN216924412U (en) | 2022-07-08 |
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