Electric igniter for continuously purifying raw gas of test furnace

Abstract

The utility model discloses an electric igniter for continuously purifying raw gas of a test furnace, which is characterized in that an electric heating wire is pre-embedded in a silicon-based ceramic heating body of the electric igniter and is formed by hot pressing and sintering, a power supply module provides a working power supply for the electric heating wire, a temperature control chip detects the temperature of the silicon-based ceramic heating body in real time, and the output power of the electric heating wire is controlled through a power regulator. Setting a heating curve in the test furnace according to a production process, communicating the temperature control chip with a PLC (Programmable Logic Controller) of the test furnace, and reading the set heating curve of the test furnace; and controlling the silicon-based ceramic heating body to output different powers through a power regulator according to each stage of the heating curve, so as to ensure that the raw gas generated in each stage is ignited and purified. According to the electric igniter and the control method, the defects of traditional raw gas combustion treatment are overcome, external combustible gas does not need to be introduced, reliable combustion of the raw gas is ensured, the electric igniter can work in a high-temperature and high-corrosion smoke environment for a long time, the service life is prolonged, and the purpose of safely discharging the raw gas is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven raw gas treatment, in particular to an electric igniter for continuously purifying the raw gas of a test coke oven. Background Art

[0002] Raw coal gas refers to the gas produced during processes such as coal gasification and coking. Its composition is complex, including combustible gases such as carbon monoxide, hydrogen, and methane. Raw coal gas cannot be discharged directly into the atmosphere and must be burned before being discharged outdoors. Due to the combustion characteristics of raw coal gas, an efficient and stable igniter is required for ignition. After receiving the ignition command, the traditional ignition device triggers the ignition controller to control the ignition transformer. The ignition needle strikes an electric spark, igniting the externally connected combustible gas to ignite the flame and continuously burn the raw coal gas generated during the production process. The externally connected combustible gas is usually introduced from the coke oven at a pressure of 0.4MPa coke oven gas, which is then burned. Because raw coal gas is generated and external combustible gas is used during the production process, gas poisoning is a major safety hazard in production areas.

[0003] The traditional ignition device uses an ignition transformer to excite the ignition needle to generate an arc to ignite the flue gas. Since the igniter is installed in the furnace top burner, the harmful gases (such as H2S, benzene, and CO) that overflow from the furnace top vent pipe for a long time are highly corrosive gases. The igniter is always in a burning state during operation. In addition, the original gas igniter has gradually become clogged due to the coke oven gas pipeline over the years. Therefore, the igniter is also prone to corrosion at high temperatures and malfunction, resulting in a small flame or even failure to ignite.

[0004] Furthermore, traditional igniters often use heating wires or spark plugs as ignition elements. These components are easily damaged in harsh environments such as high temperatures and corrosion, resulting in a short service life. Furthermore, the need to introduce external combustible gases (such as CO or natural gas) poses certain safety risks. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an electric igniter for continuously purifying the raw gas of a test furnace. The electric igniter overcomes the defects of traditional raw gas combustion treatment, does not require the introduction of external combustible gas, ensures the reliable combustion of the raw gas, can work for a long time in a high-temperature and highly corrosive flue gas environment, improves the service life, and achieves the purpose of safe discharge of raw gas.

[0006] In order to solve the above technical problems, the electric igniter of the continuous purification test furnace raw gas of the utility model includes a silicon-based ceramic heating element, a temperature control chip, a power regulator and a power supply module. The silicon-based ceramic heating element is pre-embedded with a heating wire and hot-pressed and sintered. The power supply module provides the working power for the heating wire. The temperature control chip detects the temperature of the silicon-based ceramic heating element in real time and controls the output power of the heating wire through the power regulator.

[0007] Furthermore, it also includes a support frame, a shell, a heat insulation plate and a radiator. The rear end face of the shell is arranged on the support frame through a clamping block, the temperature control chip, power regulator and power supply module are arranged in the shell, the heat insulation plate is arranged on the front end face of the shell and has an opening in the middle, the silicon-based ceramic heating element is arranged at the opening of the heat insulation plate through a heat-conducting copper plate and extends out of the front end face of the shell, and the radiator is arranged in the shell and cools the temperature control chip and power regulator.

[0008] Furthermore, the radiator is a cooling fan.

[0009] A method for controlling an electric igniter for continuously purifying raw gas in a test furnace comprises the following steps:

[0010] Step 1: Set the test furnace heating curve according to the production process, which is divided into heating section, holding section before sample enters the furnace, holding section after sample enters the furnace, sample heating section, test heating section, holding section before the end of the test, cooling section and coke oven preparation section;

[0011] Step 2: The electric igniter is mounted on the test furnace through a support frame, and the silicon-based ceramic heating element extends into the gas collecting hood in the test furnace;

[0012] Step 3: The temperature control chip communicates with the PLC controller of the test furnace to read the temperature rise curve set by the test furnace;

[0013] Step 4: During the heating period and the holding period before the sample enters the furnace, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to zero through the power regulator;

[0014] Step 5: During the heat preservation period after the sample is put into the furnace, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 30% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 300-350°C;

[0015] Step 6: During the sample heating stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 70% through the power regulator. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 800°C to ensure that the raw gas and organic volatiles generated in this stage are ignited and purified;

[0016] Step 7. During the test heating stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 90% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 1000°C, ensuring that the large amount of raw coal gas and H2 flue gas generated in this stage quickly reaches the ignition temperature and is ignited for purification;

[0017] Step 8. During the insulation period before the end of the test, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 65% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 750°C to ensure that the small amount of raw gas generated in this stage is ignited and purified;

[0018] Step 9: In the cooling stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve. No raw gas is generated in this stage, and the power regulator controls the output power of the silicon-based ceramic heating element to zero;

[0019] Step 10: In the coke oven preparation section, the temperature control chip automatically cuts off the power supply and the electric igniter stops working.

[0020] Since the electric igniter of the utility model for the continuous purification of raw gas in the test furnace adopts the above-mentioned technical solution, that is, the electric heating wire is pre-embedded in the silicon-based ceramic heating body of the electric igniter and is hot-pressed and sintered into shape, the power supply module provides the working power of the heating wire, the temperature control chip detects the temperature of the silicon-based ceramic heating body in real time, and controls the output power of the heating wire through the power regulator. The temperature rise curve in the test furnace is set according to the production process, the temperature control chip communicates with the PLC controller of the test furnace, and reads the temperature rise curve set by the test furnace; and the power regulator controls the silicon-based ceramic heating body to output different powers according to each stage of the temperature rise curve, ensuring the ignition and purification of the raw gas generated in each stage. This electric igniter overcomes the defects of traditional raw gas combustion treatment, does not require the introduction of external combustible gas, ensures the reliable combustion of raw gas, can work for a long time in a high-temperature and highly corrosive flue gas environment, improves its service life, and achieves the purpose of safe discharge of raw gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a structural diagram of the electric igniter for the continuous purification test furnace raw gas of the utility model;

[0023] Figure 2 This is a schematic diagram of the appearance of the electric igniter;

[0024] Figure 3 Schematic diagram of the temperature rise curve of the test furnace in this method. DETAILED DESCRIPTION

[0025] Implementation example Figure 1 As shown, the electric igniter of the continuous purification test furnace raw gas of the utility model includes a silicon-based ceramic heating element 1, a temperature control chip 2, a power regulator 3 and a power supply module 4. The silicon-based ceramic heating element 1 is pre-embedded with a heating wire 11 and is hot-pressed and sintered. The power supply module 4 provides working power to the heating wire 11. The temperature control chip 2 detects the temperature of the silicon-based ceramic heating element 1 in real time and controls the output power of the heating wire 11 through the power regulator 3.

[0026] like Figure 2 As shown, preferably, it also includes a support frame 5, a shell 6, a heat insulation plate 7 and a radiator 8. The rear end face of the shell 6 is arranged on the support frame 5 through a clamping block 61, the temperature control chip 2, the power regulator 3 and the power supply module 4 are arranged in the shell 6, the heat insulation plate 7 is arranged on the front end face of the shell 6 and has an opening in the middle, the silicon-based ceramic heating element 1 is arranged at the opening of the heat insulation plate 7 through a heat-conducting copper plate 12 and extends out of the front end face of the shell 6, the radiator 8 is arranged in the shell 6 and cools the temperature control chip 2 and the power regulator 3.

[0027] Preferably, the radiator 8 is a cooling fan.

[0028] Since the ignition point of raw gas is approximately 650°C, this electric igniter utilizes a silicon-based ceramic heating element. This element can heat the raw gas to approximately 1200°C within 10 seconds when powered on. It maintains its material properties at high temperatures and resists melting and deformation after exposure to heat. Furthermore, silicon-based ceramics exhibit excellent chemical corrosion resistance, allowing for long-term operation in both inorganic and organic acid environments, and can operate stably in coke oven raw gas environments. Using silicon-based ceramics as the heating element allows for rapid heat transfer to the heated gas medium, rapidly raising the raw gas temperature to its ignition point (above 650°C).

[0029] The heating element is based on silicon-based ceramics and uses electric heating wire as the heat source. The electric heating wire is pre-buried in the matrix and hot-pressed and sintered. It has:

[0030] ① Small size, light weight and good stability;

[0031] ② Excellent electrical insulation performance, strong oxidation resistance of silicon-based ceramic matrix and long service life;

[0032] ③ It has high strength at 1200℃ and will not produce creep, and can work for a long time in high temperature and highly corrosive flue gas environment.

[0033] When in use, the exposed end of the silicon-based ceramic heating element of the electric igniter is placed in the raw gas in the gas collecting hood, and the temperature control chip is used to control the heating element to quickly heat up to the ignition temperature, thereby igniting the raw gas.

[0034] A method for controlling an electric igniter for continuously purifying raw gas in a test furnace comprises the following steps:

[0035] Step 1: Figure 3 As shown in the figure, the test furnace temperature rise curve is set according to the production process, which is divided into the temperature rise section A, the heat preservation section B before the sample enters the furnace, the heat preservation section C after the sample enters the furnace, the sample temperature rise section D, the test temperature rise section E, the heat preservation section F before the end of the test, the temperature drop section G and the coke oven preparation section H;

[0036] Step 2: The electric igniter is mounted on the test furnace through a support frame, and the silicon-based ceramic heating element extends into the gas collecting hood in the test furnace;

[0037] Step 3: The temperature control chip communicates with the PLC controller of the test furnace to read the temperature rise curve set by the test furnace;

[0038] Step 4: During the heating period and the holding period before the sample enters the furnace, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to zero through the power regulator;

[0039] Step 5: During the heat preservation period after the sample is put into the furnace, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 30% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 300-350°C;

[0040] Step 6: During the sample heating stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 70% through the power regulator. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 800°C to ensure that the raw gas and organic volatiles generated in this stage are ignited and purified;

[0041] Step 7. During the test heating stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 90% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 1000°C, ensuring that the large amount of raw coal gas and H2 flue gas generated in this stage quickly reaches the ignition temperature and is ignited for purification;

[0042] Step 8. During the insulation period before the end of the test, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve, and controls the output power of the silicon-based ceramic heating element to 65% through the power regulator. According to the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 750°C to ensure that the small amount of raw gas generated in this stage is ignited and purified;

[0043] Step 9: In the cooling stage, the temperature control chip feeds back the real-time temperature in the furnace according to the heating curve. No raw gas is generated in this stage, and the power regulator controls the output power of the silicon-based ceramic heating element to zero;

[0044] Step 10: In the coke oven preparation section, the temperature control chip automatically cuts off the power supply and the electric igniter stops working.

[0045] The production process controls the temperature in the furnace by adjusting the electric heating device of the furnace body. The electric heating temperature rise curve is as follows: Figure 3 According to the analysis of the production process and the flue gas components generated at different heating stages, raw gas begins to be generated gradually during the insulation period after the sample is put into the furnace, reaches a peak during the test heating period, then gradually decreases, and basically no longer generates raw gas during the cooling period.

[0046] Therefore, in this method, the temperature control chip controls the output power of the silicon-based ceramic heating element through a power regulator at each stage of the heating curve, effectively purifies the raw gas during the generation stage, and can automatically adjust the output power at different stages, thereby achieving both raw gas purification and energy saving.

[0047] This electric igniter and control method have been in continuous production for nearly a year, and the equipment has been observed to operate flawlessly with no abnormalities. The on-site gas alarm has also not sounded, verifying its reliability, safety, and effectiveness. Through intelligent control, the power output of the silicon-based ceramic heating element is controlled in stages, achieving the goals of raw gas purification and energy conservation. This extends the service life of the electric igniter without requiring the introduction of additional coke oven gas.

Claims

1. An electric igniter for continuous purification of raw gas in a test furnace, characterized by: It includes a silicon-based ceramic heating element, a temperature control chip, a power regulator and a power supply module. The silicon-based ceramic heating element is pre-embedded with a heating wire and is hot-pressed and sintered. The power supply module provides working power for the heating wire. The temperature control chip detects the temperature of the silicon-based ceramic heating element in real time and controls the output power of the heating wire through the power regulator.

2. The electric igniter for continuous purification of raw gas in a test furnace according to claim 1, characterized in that: It also includes a support frame, a shell, a heat insulation plate and a radiator. The rear end face of the shell is arranged on the support frame through a clamping block. The temperature control chip, power regulator and power supply module are arranged in the shell. The heat insulation plate is arranged on the front end face of the shell and has an opening in the middle. The silicon-based ceramic heating element is arranged at the opening of the heat insulation plate through a heat-conducting copper plate and extends out of the front end face of the shell. The radiator is arranged in the shell and cools the temperature control chip and power regulator.

3. The electric igniter for continuous purification of raw gas in a test furnace according to claim 2, characterized in that: The heat sink is a cooling fan.

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