A smart pulverizing system flue gas furnace device and its working method

Abstract

This invention discloses an intelligent pulverizing system flue gas furnace device and its working method. The device includes a flue gas furnace, which has a furnace chamber and a flue gas mixing chamber. The furnace chamber is equipped with an ignition device and a nitrogen purging device. The ignition device includes an ignition burner and a main burner. The ignition burner is connected to a coke oven gas pipeline and an ignition combustion air pipeline, respectively. The main burner is connected to a blast furnace gas pipeline and a combustion air pipeline, respectively. The combustion air pipeline is connected to the ignition combustion air pipeline and a combustion air fan, respectively. The flue gas mixing chamber is connected to a hot blast stove exhaust gas pipeline, a cooling air pipeline, a flue gas venting pipeline, and a drying gas pipeline, respectively. The hot blast stove exhaust gas pipeline is connected to the hot blast stove exhaust gas discharge pipeline of the pulverized coal preparation system. The cooling air pipeline is connected to the combustion air fan. The flue gas venting pipeline is equipped with a venting valve and a suction valve. The drying gas pipeline is connected to the coal mill of the pulverized coal preparation system. This invention can realize automatic adjustment of the temperature and pressure of the drying gas and can solve the problems of high-temperature deformation and paint peeling of the flue gas venting pipeline.

Description

Technical Field

[0001] This invention relates to a pulverized coal preparation system, and more particularly to an intelligent pulverizing system flue gas furnace and its operating method. Background Technology

[0002] Nowadays, blast furnace pulverized coal preparation systems are generally equipped with flue gas generators, which feed the high-temperature flue gas generated in the flue gas generators into the coal mill to dry the raw coal.

[0003] With the development of technology, the flue gas generator of the blast furnace pulverized coal injection system needs to be able to automatically adjust the temperature and pressure of the dry gas, thereby creating conditions for the blast furnace pulverized coal injection system to achieve intelligent pulverization and one-click pulverization.

[0004] In addition, the current flue gas generator has problems such as deformation of the flue gas venting pipes due to high temperature and peeling of the pipe paint. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide an intelligent pulverizing system flue gas furnace device and its working method, which can realize the automatic adjustment of drying gas temperature and pressure, and solve the problems of flue gas venting pipe deformation and paint peeling due to high temperature.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A smart pulverizing system flue gas furnace device includes a flue gas furnace, a furnace chamber at the front of the flue gas furnace, and a flue gas mixing chamber at the rear of the flue gas furnace. The characteristic feature is that the furnace chamber is equipped with an ignition device, a nitrogen purging device, and a furnace chamber pressure and temperature detection device.

[0008] The ignition device includes an ignition burner and a main burner. The ignition burner is connected to a coke oven gas pipeline and an ignition combustion air pipeline, respectively. The main burner is connected to a blast furnace gas pipeline and a combustion air pipeline, respectively. The coke oven gas pipeline is equipped with a coke oven gas control valve and a coke oven gas pressure and flow detection device. The blast furnace gas pipeline is equipped with a blast furnace gas control valve and a blast furnace gas pressure and flow detection device. The combustion air pipeline is connected to a combustion air fan and is equipped with a combustion air control valve and a combustion air pressure and flow detection device. The ignition combustion air pipeline is connected to a combustion air fan and is equipped with an ignition combustion air control valve.

[0009] The flue gas mixing chamber is connected to the hot blast stove exhaust gas pipeline, cooling air pipeline, flue gas venting pipeline, and drying gas pipeline respectively. The hot blast stove exhaust gas pipeline is connected to the hot blast stove exhaust gas discharge pipeline of the pulverized coal preparation system. The hot blast stove exhaust gas pipeline is equipped with a hot blast stove exhaust gas control valve, an exhaust gas fan, and hot blast stove exhaust gas temperature and pressure detection devices. The cooling air pipeline is connected to the combustion fan and is equipped with a cooling air control valve. The flue gas venting pipeline is equipped with a venting valve and an intake valve. The drying gas pipeline is connected to the coal mill of the pulverized coal preparation system. The drying gas pipeline is equipped with a drying gas control valve and drying gas temperature, pressure, oxygen, and carbon monoxide detection devices.

[0010] Furthermore, the coke oven gas control valve includes a manual regulating valve and a shut-off valve; the coke oven gas pressure and flow detection device includes a pressure gauge and a flow meter.

[0011] Furthermore, the blast furnace gas control valve includes a manual regulating valve, an automatic regulating valve, and a shut-off valve; the blast furnace gas pressure and flow detection device includes a pressure gauge and a flow meter.

[0012] Furthermore, the combustion air control valve includes a manual regulating valve and an automatic regulating valve; the combustion air pressure and flow detection device includes a pressure gauge and a flow meter.

[0013] Furthermore, the ignition and combustion-supporting air control valve includes a shut-off valve.

[0014] Furthermore, the hot blast stove exhaust gas control valve includes an automatic regulating valve; the hot blast stove exhaust gas temperature and pressure detection device includes a thermometer and a pressure gauge.

[0015] Furthermore, the cooling air control valve includes an automatic regulating valve.

[0016] Furthermore, the drying gas control valve includes an automatic regulating valve; the drying gas temperature, pressure, oxygen, and carbon monoxide detection device includes a thermometer, a pressure gauge, and oxygen and carbon monoxide gas detectors.

[0017] The working method of the above-mentioned intelligent pulverizing system flue gas furnace device includes:

[0018] Before the pulverizing system begins production, close the drying gas control valve, hot blast stove exhaust gas control valve, blast furnace gas control valve, and combustion air control valve. Open the venting valve and nitrogen purging device, and use nitrogen to purge the furnace. After purging the furnace with nitrogen, close the nitrogen purging device. Open the combustion air fan and combustion air control valve, and use air to purge the furnace. After purging the furnace with air, close the combustion air control valve, open the coke oven gas control valve and ignition combustion air control valve, and start the ignition burner to complete the automatic ignition of the flue gas furnace.

[0019] During pulverization, the blast furnace gas control valve and combustion air control valve are opened, and the main burner is started. After the main burner starts, the ignition burner is closed. The blast furnace gas flow rate is adjusted through the blast furnace gas control valve to ensure that the drying gas temperature reaches the set value. At the same time as adjusting the blast furnace gas flow rate, the combustion air flow rate is adjusted synchronously through the combustion air control valve to maintain the air-fuel ratio of blast furnace gas and combustion air at the set value. The hot blast stove exhaust gas control valve is opened to allow the hot blast stove exhaust gas from the pulverized coal preparation system to be introduced into the flue gas mixing chamber and mixed with the high-temperature flue gas generated in the furnace. After mixing, the mixture is introduced into the coal mill through the drying gas pipeline. Based on the furnace negative pressure, the flow rate of the hot blast stove exhaust gas entering the flue gas mixing chamber is adjusted through the hot blast stove exhaust gas control valve to achieve automatic regulation of the drying gas temperature and pressure.

[0020] When the pulverizing system stops and the flue gas furnace is in a heat preservation state, the valve opening of the combustion air control valve is reduced, and the cooling air control valve is opened to send excess air to the flue gas furnace mixing chamber, thereby reducing the exhaust temperature of the flue gas venting pipe. The intake valve of the flue gas furnace venting pipe is kept open to draw in the surrounding cold air into the flue gas venting pipe, thereby reducing the temperature of the flue gas venting pipe and achieving the cooling and protection function of the flue gas venting pipe.

[0021] Furthermore, during the adjustment of the temperature and pressure of the drying gas, the oxygen content and carbon monoxide concentration of the drying gas are monitored simultaneously. If the oxygen content is too high, the air-fuel ratio of blast furnace gas and combustion air is reduced; if the carbon monoxide concentration is too high, the air-fuel ratio of blast furnace gas and combustion air is increased.

[0022] Beneficial effects:

[0023] 1. By using this flue gas furnace device, the blast furnace gas and combustion air flow can be automatically controlled according to a certain air-fuel ratio based on the detection of blast furnace gas and combustion air flow.

[0024] 2. By using this flue gas furnace device, the opening of valves for blast furnace gas, combustion air, and hot blast stove exhaust gas can be automatically adjusted based on the detection of flue gas furnace pressure and temperature, and drying gas pressure and temperature, thereby realizing automatic control and regulation of drying gas;

[0025] 3. This flue gas furnace device can achieve automatic ignition using coke oven gas or natural gas;

[0026] 4. By using this flue gas furnace device, the temperature of the flue gas venting gas is reduced during the flue gas furnace insulation, thereby protecting the flue gas venting pipeline. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] In the diagram: 1-Flue gas furnace; 2-Furnace chamber; 3-Flue gas mixing chamber; 4-Ignition device; 5-Nitrogen purging device; 6-Coke oven gas pipeline; 7-Ignition and combustion air pipeline; 8-Blast furnace gas pipeline; 9-Combustion air pipeline; 10-Combustion air fan; 11-Hot blast stove exhaust gas pipeline; 12-Cooling air pipeline; 13-Flue gas venting pipeline; 14-Intake valve; 15-Drying gas pipeline; 16-Exhaust gas fan. Detailed Implementation

[0029] The invention will now be further explained with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the present invention provides an intelligent pulverizing system flue gas furnace device, including a flue gas furnace 1, a furnace chamber 2 at the front of the flue gas furnace 1, a flue gas mixing chamber 3 at the rear of the flue gas furnace 2, an ignition device 4, a nitrogen purging device 5, and a furnace pressure and temperature detection device, the furnace pressure and temperature detection device including a pressure gauge and a thermometer.

[0031] The ignition device 4 includes an ignition burner and a main burner. The ignition burner is connected to the coke oven gas pipeline 6 and the ignition combustion air pipeline 7, respectively. The main burner is connected to the blast furnace gas pipeline 8 and the combustion air pipeline 9, respectively. The coke oven gas pipeline 6 is equipped with a coke oven gas control valve and a coke oven gas pressure and flow detection device. The gas control valve includes a manual regulating valve and a shut-off valve; the coke oven gas pressure and flow detection device includes a pressure gauge and a flow meter. The blast furnace gas pipeline 8 is equipped with a blast furnace gas control valve and a blast furnace gas pressure and flow detection device. The blast furnace gas control valve includes a manual regulating valve, an automatic regulating valve, and a shut-off valve; the blast furnace gas pressure and flow detection device includes a pressure gauge and a flow meter. The combustion air pipeline 9 is connected to the combustion air fan 10. The combustion air pipeline is equipped with a combustion air control valve and a combustion air pressure and flow detection device. The combustion air control valve includes a manual regulating valve and an automatic regulating valve; the combustion air pressure and flow detection device includes a pressure gauge and a flow meter. The ignition and combustion air duct 7 is connected to the combustion air fan 10, and the ignition and combustion air duct 7 is equipped with an ignition and combustion air control valve. The ignition and combustion air control valve includes a shut-off valve.

[0032] The flue gas mixing chamber 3 is connected to the hot blast stove exhaust gas duct 11, cooling air duct 12, flue gas venting duct 13, and drying gas duct 15. The hot blast stove exhaust gas duct 11 is connected to the hot blast stove exhaust gas discharge duct of the pulverized coal preparation system. The hot blast stove exhaust gas duct 11 is equipped with a hot blast stove exhaust gas control valve, an exhaust gas fan 16, and hot blast stove exhaust gas temperature and pressure detection devices. The hot blast stove exhaust gas control valve includes an automatic regulating valve; the hot blast stove exhaust gas temperature and pressure detection devices include a thermometer and a pressure gauge. The cooling air duct 12 is connected to the combustion fan 10. The cooling air duct 12 is equipped with a cooling air control valve, which includes an automatic regulating valve. The flue gas venting duct 13 is equipped with a venting valve and an intake valve 14. The drying gas duct 15 is connected to the coal mill of the pulverized coal preparation system. The drying gas duct 15 is equipped with a drying gas control valve and drying gas temperature, pressure, oxygen, and carbon monoxide detection devices. The drying gas control valve includes an automatic regulating valve; the drying gas temperature, pressure, oxygen, and carbon monoxide detection device includes a thermometer, a pressure gauge, and oxygen and carbon monoxide gas detectors.

[0033] In this invention, the air volume of the combustion fan 10 should be selected based on the maximum value of the gas air-fuel ratio and the cooling air during heat preservation, while retaining a safety margin.

[0034] The operating method of the intelligent pulverizing system flue gas furnace device of the present invention, as described above, includes:

[0035] Before the pulverizing system begins production, close the drying gas control valve, hot blast stove exhaust gas control valve, blast furnace gas control valve, and combustion air control valve. Open the venting valve and nitrogen purging device, and use nitrogen to purge the furnace. After purging the furnace with nitrogen, close the nitrogen purging device. Open the combustion air fan and combustion air control valve, and use air to purge the furnace. After purging the furnace with air, close the combustion air control valve, open the coke oven gas control valve and ignition combustion air control valve, and start the ignition burner to complete the automatic ignition of the flue gas furnace.

[0036] During pulverization, the blast furnace gas control valve and combustion air control valve are opened, and the main burner is started. After the main burner starts, the ignition burner is closed. The blast furnace gas flow rate is adjusted through the blast furnace gas control valve to ensure that the drying gas temperature reaches the set value. At the same time as adjusting the blast furnace gas flow rate, the combustion air flow rate is adjusted synchronously through the combustion air control valve to maintain the air-fuel ratio of blast furnace gas and combustion air at the set value. The hot blast stove exhaust gas control valve is opened to allow the hot blast stove exhaust gas from the pulverized coal preparation system to be introduced into the flue gas mixing chamber and mixed with the high-temperature flue gas generated in the furnace. After mixing, the mixture is introduced into the coal mill through the drying gas pipeline. Based on the furnace negative pressure, the flow rate of the hot blast stove exhaust gas entering the flue gas mixing chamber is adjusted through the hot blast stove exhaust gas control valve to achieve automatic regulation of the drying gas temperature and pressure.

[0037] When the pulverizing system stops and the flue gas furnace is in a heat preservation state, the valve opening of the combustion air control valve is reduced, and the cooling air control valve is opened to send excess air to the flue gas furnace mixing chamber, thereby reducing the exhaust temperature of the flue gas venting pipe. The intake valve of the flue gas furnace venting pipe is kept open to draw in the surrounding cold air into the flue gas venting pipe, thereby reducing the temperature of the flue gas venting pipe and achieving the cooling and protection function of the flue gas venting pipe.

[0038] During the adjustment of the temperature and pressure of the drying gas, the oxygen content and carbon monoxide concentration of the drying gas are monitored simultaneously. The normal oxygen content is 4.5% to 6%, and the normal carbon monoxide concentration is less than 1000 ppm. If the oxygen content is too high, the air-fuel ratio of blast furnace gas and combustion air is reduced. If the carbon monoxide concentration is too high, the air-fuel ratio of blast furnace gas and combustion air is increased.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for operating a flue gas furnace device in an intelligent pulverizing system, the flue gas furnace device comprising a flue gas furnace, a furnace chamber at the front of the flue gas furnace, and a flue gas mixing chamber at the rear of the flue gas furnace; the furnace chamber is equipped with an ignition device, a nitrogen purging device, and furnace pressure and temperature detection devices; the ignition device includes an ignition burner and a main burner, the ignition burner being connected to a coke oven gas pipeline and an ignition combustion air pipeline respectively, the main burner being connected to a blast furnace gas pipeline and a combustion air pipeline respectively, the coke oven gas pipeline being equipped with a coke oven gas control valve and a coke oven gas pressure and flow detection device, the blast furnace gas pipeline being equipped with a blast furnace gas control valve and a blast furnace gas pressure and flow detection device, and the combustion air pipeline being connected to a combustion air fan, the combustion air pipeline being equipped with a combustion air control valve and a combustion air pressure... The system includes a force and flow detection device; an ignition and combustion air duct connected to a combustion air fan; the ignition and combustion air duct is equipped with an ignition and combustion air control valve; the flue gas mixing chamber is connected to a hot blast stove exhaust gas duct, a cooling air duct, a flue gas venting duct, and a drying gas duct; the hot blast stove exhaust gas duct is connected to the hot blast stove exhaust gas discharge duct of the pulverized coal preparation system; the hot blast stove exhaust gas duct is equipped with a hot blast stove exhaust gas control valve, an exhaust gas fan, and a hot blast stove exhaust gas temperature and pressure detection device; the cooling air duct is connected to the combustion air fan; the cooling air duct is equipped with a cooling air control valve; the flue gas venting duct is equipped with a venting valve and an intake valve; and the drying gas duct is connected to the coal mill of the pulverized coal preparation system; the drying gas duct is equipped with a drying gas control valve and a drying gas temperature, pressure, oxygen, and carbon monoxide detection device. Its distinguishing feature is... This working method includes: Before the pulverizing system begins production, close the drying gas control valve, hot blast stove exhaust gas control valve, blast furnace gas control valve, and combustion air control valve. Open the venting valve and nitrogen purging device, and use nitrogen to purge the furnace. After purging the furnace with nitrogen, close the nitrogen purging device. Open the combustion air fan and combustion air control valve, and use air to purge the furnace. After purging the furnace with air, close the combustion air control valve, open the coke oven gas control valve and ignition combustion air control valve, and start the ignition burner to complete the automatic ignition of the flue gas furnace. During pulverization, the blast furnace gas control valve and combustion air control valve are opened, and the main burner is started. After the main burner starts, the ignition burner is closed. The blast furnace gas flow rate is adjusted through the blast furnace gas control valve to ensure that the drying gas temperature reaches the set value. At the same time as adjusting the blast furnace gas flow rate, the combustion air flow rate is adjusted synchronously through the combustion air control valve to maintain the air-fuel ratio of blast furnace gas and combustion air at the set value. The hot blast stove exhaust gas control valve is opened to allow the hot blast stove exhaust gas from the pulverized coal preparation system to be introduced into the flue gas mixing chamber and mixed with the high-temperature flue gas generated in the furnace. After mixing, the mixture is introduced into the coal mill through the drying gas pipeline. Based on the furnace negative pressure, the flow rate of the hot blast stove exhaust gas entering the flue gas mixing chamber is adjusted through the hot blast stove exhaust gas control valve to achieve automatic regulation of the drying gas temperature and pressure. When the pulverizing system stops and the flue gas furnace is in a heat preservation state, the valve opening of the combustion air control valve is reduced, and the cooling air control valve is opened to send excess air to the flue gas furnace mixing chamber, thereby reducing the exhaust temperature of the flue gas venting pipe. The intake valve of the flue gas furnace venting pipe is kept open to draw in the surrounding cold air into the flue gas venting pipe, thereby reducing the temperature of the flue gas venting pipe and achieving the cooling and protection function of the flue gas venting pipe.

2. The working method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The coke oven gas control valve includes a manual regulating valve and a shut-off valve; the coke oven gas pressure and flow detection device includes a pressure gauge and a flow meter.

3. The operating method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The blast furnace gas control valve includes a manual regulating valve, an automatic regulating valve, and a shut-off valve; the blast furnace gas pressure and flow detection device includes a pressure gauge and a flow meter.

4. The working method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The combustion air control valve includes a manual regulating valve and an automatic regulating valve; the combustion air pressure and flow detection device includes a pressure gauge and a flow meter.

5. The operating method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The ignition and combustion air control valve includes a shut-off valve.

6. The working method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The hot blast furnace exhaust gas control valve includes an automatic regulating valve; the hot blast furnace exhaust gas temperature and pressure detection device includes a thermometer and a pressure gauge.

7. The working method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The cooling air control valve includes an automatic regulating valve.

8. The working method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that: The drying gas control valve includes an automatic regulating valve; the drying gas temperature, pressure, oxygen, and carbon monoxide detection device includes a thermometer, a pressure gauge, and oxygen and carbon monoxide gas detectors.

9. The operating method of the intelligent pulverizing system flue gas furnace device according to claim 1, characterized in that, During the adjustment of the temperature and pressure of the drying gas, the oxygen content and carbon monoxide concentration of the drying gas are monitored simultaneously. If the oxygen content is too high, the air-fuel ratio of blast furnace gas and combustion air is reduced; if the carbon monoxide concentration is too high, the air-fuel ratio of blast furnace gas and combustion air is increased.

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