Electric pilot control method for continuous purification of raw coal gas in a test furnace

Abstract

The application discloses a continuous purification test furnace raw coal gas electric igniter and a control method. The electric igniter is provided with an electric heating wire embedded in a silicon-based ceramic heating body and hot-pressed and sintered into shape. A power supply module provides a working power source for the electric heating wire. A temperature control chip detects the temperature of the silicon-based ceramic heating body in real time and controls the output power of the electric heating wire through a power regulator. The method sets a temperature rising curve in the test furnace according to a production process, the temperature control chip communicates with a PLC controller of the test furnace, reads the set temperature rising curve of the test furnace, and controls the silicon-based ceramic heating body to output different powers through the power regulator according to each stage of the temperature rising curve, so that the raw coal gas produced in each stage is ignited and purified. The electric igniter and the control method overcome the defects of traditional raw coal gas combustion treatment, do not need to introduce external combustible gas, ensure reliable combustion of the raw coal gas, can work in a high-temperature and high-corrosion flue gas environment for a long time, improve the service life, and achieve the purpose of safe discharge of the raw coal gas.

Description

Technical Field

[0001] This invention relates to the field of coke oven raw gas treatment technology, and in particular to an electric igniter control method for continuously purifying raw gas from a test furnace. Background Technology

[0002] Raw coal gas refers to the gas produced during coal gasification, coking, and other processes. Its composition is complex, including combustible gases such as carbon monoxide, hydrogen, and methane. Raw coal gas cannot be directly released into the atmosphere and must be combusted before being released outdoors. Due to the combustion characteristics of raw coal gas, a highly efficient and stable igniter is required. Traditional ignition devices, upon receiving an ignition command, trigger an ignition controller to control an ignition transformer. An ignition needle then generates a spark, igniting an externally supplied combustible gas to continuously burn the raw coal gas produced during production. This externally supplied combustible gas is typically coke oven gas at a pressure of 0.4 MPa, which is then introduced from the coke oven for combustion. Because raw coal gas is generated and external combustible gas is used during production, carbon monoxide poisoning is a significant safety hazard in production areas.

[0003] Traditional ignition devices use an ignition transformer to excite the ignition needle to generate an electric arc to ignite the flue gas. Since the igniter is installed in the burner on the furnace top, the harmful gases (such as H2S, benzene, and CO) that overflow from the furnace top vent pipe over a long period of time are highly corrosive. In addition, the igniter is always in a combustion state during operation. Furthermore, due to the gradual blockage of the coke oven gas pipeline over the years, the original gas igniter is also prone to corrosion at high temperatures, resulting in malfunctions, such as small flames or even failure to ignite.

[0004] Furthermore, traditional igniters often use heating wires or spark plugs as ignition elements. These elements are easily damaged in harsh environments such as high temperatures and corrosion, resulting in a short service life. Moreover, because they require the introduction of combustible gas (such as CO or natural gas) from an external source, there are certain safety risks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an electric igniter control method for raw coal gas in a continuous purification test furnace. This electric igniter control method overcomes the defects of traditional raw coal gas combustion treatment, eliminates the need to introduce external combustible gas, ensures reliable combustion of raw coal gas, can work for a long time in a high-temperature and highly corrosive flue gas environment, improves service life, and achieves the goal of safe emission of raw coal gas.

[0006] To solve the above-mentioned technical problems, the electric igniter for the continuous purification test furnace raw gas of the present invention 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 has an embedded heating wire and is hot-pressed and sintered. The power supply module provides power to 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 housing, a heat insulation plate, and a heat sink. The rear end face of the housing is mounted on the support frame via a clamping block. The temperature control chip, power regulator, and power supply module are located inside the housing. The heat insulation plate is located on the front end face of the housing and has an opening in the middle. The silicon-based ceramic heating element is mounted at the opening of the heat insulation plate via a thermally conductive copper plate and extends out of the front end face of the housing. The heat sink is located inside the housing and cools the temperature control chip and the power regulator.

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

[0009] A method for controlling the electric igniter of the above-mentioned continuously purified test furnace raw gas includes the following steps:

[0010] Step 1: Set the heating curve of the test furnace according to the production process, and divide it into the heating section, the heat preservation section before the sample enters the furnace, the heat preservation section after the sample enters the furnace, the sample heating section, the test heating section, the heat preservation section before the end of the test, the cooling section, and the preparation section for entering the coke quenching furnace.

[0011] Step 2: The electric igniter is mounted on the test furnace via a support frame, and the silicon-based ceramic heating element extends into the gas collection hood inside 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: In the heating section and the heat preservation section before the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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: In the heat preservation section after the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 300-350℃.

[0015] Step 6: In the sample heating section, the temperature control chip feeds back the real-time temperature inside 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℃ to ensure that the raw coal gas and volatile organic compounds generated in this stage are ignited and purified.

[0016] Step 7: During the experimental heating stage, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 1000℃ to ensure that the large amount of raw coal gas and H2 flue gas generated in this stage quickly reach the ignition temperature for ignition and purification.

[0017] Step 8: During the heat preservation phase before the end of the test, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 750℃ to ensure that the small amount of raw coal gas generated in this stage is ignited and purified.

[0018] Step 9: During the cooling phase, the temperature control chip provides feedback on the real-time temperature inside the furnace based on the heating curve. No raw coal gas is generated during this phase, and the output power of the silicon-based ceramic heating element is controlled to be zero by the power regulator.

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

[0020] Because the electric igniter control method for the continuous purification test furnace raw coal gas of this invention adopts the above-mentioned technical solution, namely, the silicon-based ceramic heating element of this electric igniter is pre-embedded with an electric 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. This method sets the heating curve inside the test furnace according to the production process, the temperature control chip communicates with the PLC controller of the test furnace to read the set heating curve, and controls the silicon-based ceramic heating element to output different power according to each stage of the heating curve, ensuring the ignition and purification treatment of the raw coal gas generated at each stage. This electric igniter and control method overcome the defects of traditional raw coal gas combustion treatment, eliminates the need to introduce external combustible gas, ensures reliable combustion of raw coal gas, can work for a long time in a high-temperature and highly corrosive flue gas environment, improves service life, and achieves the goal of safe emission of raw coal gas. Attached Figure Description

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

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

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

[0024] Figure 3 This is a schematic diagram of the temperature rise curve of the experimental furnace in this method. Detailed Implementation

[0025] Implementation, for example Figure 1 As shown, the electric igniter for the continuous purification test furnace raw coal gas of the present invention 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 has a pre-embedded heating wire 11 and is hot-pressed and sintered. The power supply module 4 provides the heating wire 11 with working power. 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 housing 6, a heat insulation plate 7, and a heat sink 8. The rear end face of the housing 6 is mounted on the support frame 5 via a clamping block 61. The temperature control chip 2, the power regulator 3, and the power supply module 4 are located inside the housing 6. The heat insulation plate 7 is located on the front end face of the housing 6 and has an opening in the middle. The silicon-based ceramic heating element 1 is located at the opening of the heat insulation plate 7 via a thermally conductive copper plate 12 and extends out of the front end face of the housing 6. The heat sink 8 is located inside the housing 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 coke oven gas is approximately 650℃, this electric igniter uses a silicon-based ceramic heating element, which can heat up to about 1200℃ within 10 seconds when powered on, and can continuously maintain the material properties unchanged at high temperatures, without melting or deformation after heating. Furthermore, silicon-based ceramics have excellent chemical corrosion resistance, allowing for long-term operation in both inorganic and organic acid environments, and stable operation in the coke oven raw gas environment. Using silicon-based ceramics as the heating element allows for rapid heat transfer to the heated gas medium, thereby quickly raising the temperature of the coke oven raw gas to its ignition point (above 650℃).

[0029] The heating element uses silicon-based ceramic as the substrate and an electric heating wire as the heat source. The heating wire is pre-embedded in the substrate and hot-pressed and sintered. It features:

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

[0031] ② It has excellent electrical insulation properties, and the silicon-based ceramic matrix has strong oxidation resistance and a long service life;

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

[0033] When in use, the exposed end of the silicon-based ceramic heating element of the electric igniter is placed in the raw coal gas in the gas collection hood. The heating element is heated rapidly by the temperature control chip to reach the ignition temperature, thereby igniting the raw coal gas.

[0034] A method for controlling the electric igniter of the above-mentioned continuously purified test furnace raw gas includes the following steps:

[0035] Step 1, such as Figure 3 As shown, the heating curve of the test furnace is set according to the production process and is divided into heating section A, heat preservation section before sample enters the furnace B, heat preservation section after sample enters the furnace C, sample heating section D, test heating section E, heat preservation section before the end of the test F, cooling section G, and preparation section H for entering the coke quenching furnace.

[0036] Step 2: The electric igniter is mounted on the test furnace via a support frame, and the silicon-based ceramic heating element extends into the gas collection hood inside 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: In the heating section and the heat preservation section before the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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: In the heat preservation section after the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 300-350℃.

[0040] Step 6: In the sample heating section, the temperature control chip feeds back the real-time temperature inside 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℃ to ensure that the raw coal gas and volatile organic compounds generated in this stage are ignited and purified.

[0041] Step 7: During the experimental heating stage, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 1000℃ to ensure that the large amount of raw coal gas and H2 flue gas generated in this stage quickly reach the ignition temperature for ignition and purification.

[0042] Step 8: During the heat preservation phase before the end of the test, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 750℃ to ensure that the small amount of raw coal gas generated in this stage is ignited and purified.

[0043] Step 9: During the cooling phase, the temperature control chip provides feedback on the real-time temperature inside the furnace based on the heating curve. No raw coal gas is generated during this phase, and the output power of the silicon-based ceramic heating element is controlled to be zero by the power regulator.

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

[0045] The production process controls the furnace temperature by adjusting the electric heating device in the furnace body. The electric heating temperature rise curve is as follows: Figure 3 As shown. Based on the analysis of the flue gas composition generated in different heating stages according to the production process, raw coal gas begins to be generated gradually in the heat preservation section after the sample is put into the furnace, reaches its peak in the heating stage, and then gradually decreases. In the cooling stage, raw coal gas is basically no longer generated.

[0046] Therefore, this method uses a temperature control chip to control the output power of the silicon-based ceramic heating element at each stage of the heating curve through a power regulator. It effectively purifies the raw coal gas during the raw coal gas generation stage and can automatically adjust the output power at different stages, thus achieving both the purification of raw coal gas 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 be in good working order with no abnormalities. The on-site gas alarms have also not triggered, 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 coal gas purification and energy saving, extending the service life of the electric igniter, and eliminating the need to introduce additional coke oven gas.

Claims

1. A method for controlling an electric igniter for continuously purifying raw coal gas in a test furnace, the electric igniter comprising a silicon-based ceramic heating element, a temperature control chip, a power regulator, and a power supply module, wherein an electric heating wire is pre-embedded in the silicon-based ceramic heating element and hot-pressed and sintered, the power supply module provides power to the electric 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 electric heating wire through the power regulator; characterized in that... Includes the following steps: Step 1: Set the heating curve of the test furnace according to the production process, and divide it into the heating section, the heat preservation section before the sample enters the furnace, the heat preservation section after the sample enters the furnace, the sample heating section, the test heating section, the heat preservation section before the end of the test, the cooling section, and the preparation section for entering the coke quenching furnace. Step 2: The electric igniter is mounted on the test furnace via a support frame, and the silicon-based ceramic heating element extends into the gas collection hood inside the test furnace; 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; Step 4: In the heating section and the heat preservation section before the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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. Step 5: In the heat preservation section after the sample enters the furnace, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 300-350℃. Step 6: In the sample heating section, the temperature control chip feeds back the real-time temperature inside 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℃ to ensure that the raw coal gas and volatile organic compounds generated in this stage are ignited and purified. Step 7: During the experimental heating stage, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 1000℃ to ensure that the large amount of raw coal gas and H2 flue gas generated in this stage quickly reach the ignition temperature for ignition and purification. Step 8: During the heat preservation phase before the end of the test, the temperature control chip feeds back the real-time temperature inside 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. Based on the water vapor and sulfur substances generated in this stage, the temperature of the silicon-based ceramic heating element is maintained at 750℃ to ensure that the small amount of raw coal gas generated in this stage is ignited and purified. Step 9: During the cooling phase, the temperature control chip provides feedback on the real-time temperature inside the furnace based on the heating curve. No raw coal gas is generated during this phase, and the output power of the silicon-based ceramic heating element is controlled to be zero by the power regulator. Step 10: In the preparation section before entering the coke quenching oven, the temperature control chip automatically cuts off the power, and the electric igniter stops working.

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