Ignition control system and control method for sludge combustible gas hot blast furnace

Abstract

The present invention relates to an ignition control system for a sludge combustible gas hot blast furnace, comprising a control cabinet and a hot blast furnace, a combustion-supporting system, a cracking gas system, a natural gas system, an ignition system and an air compression station system respectively connected to the control cabinet; the combustion-supporting system comprises a combustion-supporting fan and a combustion-supporting air duct; the cracking gas system comprises a cracking gas source, a cracking pipeline and a cracking venting pipeline; the natural gas system comprises a natural gas source, a natural gas main pipe connecting the natural gas source and a cracking gas mixer, a natural gas branch pipe, a venting pipe 1 and a venting pipe 2; the natural gas main pipe is connected to the natural gas branch pipe, and the natural gas branch pipe is connected to an igniter; the ignition system comprises an ignition fan and an ignition pipeline connecting the ignition fan and the hot blast furnace; the air compression station system is connected to the hot blast furnace. The present invention also relates to an ignition control method for a sludge combustible gas hot blast furnace. The present invention adopts different measures to achieve successful ignition and safety guarantee of sludge combustible gas.

Description

Technical Field

[0001] The invention relates to the technical field of municipal sludge pyrolysis and gasification, and in particular to an ignition control system and a control method for a sludge combustible gas hot blast furnace. Background Art

[0002] Sludge is the solid sediment produced during the sewage treatment process. The pollutants it contains generally have a high calorific value, but due to the presence of a large amount of water, this part of the calorific value cannot be utilized.

[0003] Sludge pyrolysis and gasification technology is a technology that makes large-scale sludge reduction, stabilization, harmlessness and resource utilization a reality under the premise of being odorless and pollution-free. Pyrolysis and gasification technology has high thermal efficiency. Under high temperature and oxygen deficiency, organic matter is pyrolyzed into combustible gases such as carbon monoxide, hydrogen, and hydrocarbons.

[0004] Due to the complex sludge pyrolysis reaction process, the combustible gas components produced are difficult to effectively control, the calorific value is unstable, and there are many unstable factors in the ignition process. In order to ensure the stability of ignition, high calorific value gas is used as the ignition source. After the hot air furnace temperature is raised to above 600℃, combustible gas is introduced for ignition. This is also the main way to ignite low calorific value gas.

[0005] At present, the traditional ignition method of low calorific value gas has certain requirements on the composition, pressure and flow rate of combustible gas. However, due to the complex reaction of sludge combustible gas, it is difficult to ensure that these indicators are always stable. Therefore, there are many emergencies that may occur during ignition, such as: combustible gas pressure fluctuations, composition fluctuations, calorific value fluctuations, etc. In order to cope with these situations, a sludge combustible gas hot blast furnace ignition control system and control method are proposed, and different measures are taken to ensure the success and safety of ignition. Summary of the invention

[0006] In order to solve the problem that the current traditional low calorific value gas ignition method is not suitable for sludge combustible gas ignition, the present invention provides a sludge combustible gas hot air furnace ignition control system and control method, and adopts different measures to achieve successful and safe ignition of sludge combustible gas.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] A sludge combustible gas hot blast furnace ignition control system, comprising a control cabinet and a hot blast furnace, a combustion-supporting system, a cracking gas system, a natural gas system, an ignition system and an air compression station system respectively connected to the control cabinet, wherein the hot blast furnace comprises a furnace body, a combustion-supporting air inlet, a cracking gas inlet, a compressed air inlet, an igniter and an ignition gun;

[0009] The combustion-supporting system includes a combustion-supporting fan and a combustion-supporting air duct connecting the combustion-supporting fan and the combustion-supporting air inlet, and the combustion-supporting air duct is sequentially provided with an HV-A1 manual regulating valve, a PG240301 pressure gauge, a PT240301 pressure transmitter, an FV240301 pneumatic regulating valve and an HV-A2 manual regulating valve;

[0010] The cracking gas system comprises a cracking gas source and a cracking pipeline connecting the cracking gas source and the cracking gas inlet, wherein the cracking pipeline is sequentially provided with an HV-G1 manual regulating valve, a PG240302 pressure gauge, a PT240302 pressure transmitter, a PV240302 pneumatic regulating valve, an XV240301 pneumatic switch valve, a PG240303 pressure gauge, an HV-G2 manual regulating valve, a cracking gas mixer, an HV-G3 manual regulating valve, a PT240303 pressure transmitter, an XV240302 pneumatic switch valve, an HV240301 pneumatic regulating valve and an HV-G4 manual regulating valve;

[0011] The cracking pipeline between the HV240301 pneumatic regulating valve and the HV-G4 manual regulating valve is connected with a cracking release pipeline, and the cracking release pipeline is sequentially provided with an HV-G5 manual release valve and an HV-G6 manual release valve;

[0012] The natural gas system comprises a natural gas source, a natural gas main pipe connecting the natural gas source and the cracking gas mixer, a natural gas branch pipe, a first vent pipe and a second vent pipe;

[0013] The natural gas main pipe is provided with an HV-L1 manual regulating valve, a PG240305 pressure gauge, an HV-L2 manual regulating valve, a PCV240301 natural gas pressure reducing valve, a PG240306 pressure gauge, an XV240304 main solenoid valve, a PT240304 pressure transmitter, an XV240303 main solenoid valve, a TV240301 pneumatic regulating valve and an HV-L3 manual regulating valve in sequence;

[0014] The natural gas main pipe between the PG240305 pressure gauge and the HV-L2 manual regulating valve is connected to the natural gas branch pipe, which is connected to the igniter. The natural gas branch pipe is sequentially provided with an HV-L4 manual regulating valve, a PCV240302 natural gas pressure reducing valve, a PG240308 pressure gauge, an SV240302 branch pipe solenoid valve and an HV-L6 manual regulating valve;

[0015] The natural gas main pipe between the TV240301 pneumatic regulating valve and the HV-L3 manual regulating valve is connected to the vent pipe 1, and the vent pipe 1 is provided with an HV-L8 manual vent valve; the natural gas branch pipe between the SV240302 branch pipe solenoid valve and the HV-L6 manual regulating valve is connected to the vent pipe 2, and the vent pipe 2 is provided with an HV-L7 manual vent valve;

[0016] The ignition system includes an ignition fan and an ignition pipeline connecting the ignition fan and the igniter, and a PG240309 pressure gauge, an HV-A3 manual regulating valve and an HV-A4 manual regulating valve are sequentially arranged on the ignition pipeline;

[0017] The air compression station system is connected to the compressed air inlet, and the air compression station system is also connected to each pneumatic valve to provide a power source.

[0018] Furthermore, a BE-602UV probe is provided at the combustion-supporting air inlet, and the ignition gun includes an IT-601 ignition transformer, an IP-601 ignition electrode and a BE-601UV probe.

[0019] Furthermore, the HV-A1 manual regulating valve, PG240301 pressure gauge, PT240301 pressure transmitter, FV240301 pneumatic regulating valve and HV-A2 manual regulating valve are arranged in sequence from the combustion air fan to the combustion-supporting air inlet.

[0020] Furthermore, the HV-G1 manual regulating valve, PG240302 pressure gauge, PT240302 pressure transmitter, PV240302 pneumatic regulating valve, XV240301 pneumatic switch valve, PG240303 pressure gauge, HV-G2 manual regulating valve, cracking gas mixer, HV-G3 manual regulating valve, PT240303 pressure transmitter, XV240302 pneumatic switch valve, HV240301 pneumatic regulating valve and HV-G4 manual regulating valve are arranged in sequence from the cracking gas source to the cracking gas inlet.

[0021] Further, the HV-L1 manual regulating valve, PG240305 pressure gauge, HV-L2 manual regulating valve, PCV240301 natural gas pressure reducing valve, PG240306 pressure gauge, XV240304 main solenoid valve, PT240304 pressure transmitter, XV240303 main solenoid valve, TV240301 pneumatic regulating valve and HV-L3 manual regulating valve are arranged in sequence from the natural gas source to the cracking gas mixer;

[0022] The HV-L4 manual regulating valve, PCV240302 natural gas pressure reducing valve, PG240308 pressure gauge, SV240302 branch pipe solenoid valve and HV-L6 manual regulating valve are arranged in sequence along the natural gas flow direction;

[0023] After the ends of the first and second emission pipes are connected, they are merged into the cracking emission pipeline.

[0024] Furthermore, the PG240309 pressure gauge, HV-A3 manual regulating valve and HV-A4 manual regulating valve are arranged in sequence from the ignition fan to the igniter.

[0025] Furthermore, the air compression station system includes an air compression station and an air supply main connecting the air compression station and the compressed air inlet, the air supply main is provided with an HV-C1 manual regulating valve and a PG240304 pressure gauge in sequence, and the air supply main is connected with multiple air supply branches, which are respectively connected with the PV240302 pneumatic regulating valve, XV240301 pneumatic switching valve, XV240302 pneumatic switching valve, HV240301 pneumatic regulating valve, FV240301 pneumatic regulating valve and TV240301 pneumatic regulating valve.

[0026] Furthermore, the air supply main pipe is also provided with an HV-C2 manual regulating valve and an HV-C3 manual regulating valve, and the HV-C1 manual regulating valve, the PG240304 pressure gauge, the HV-C2 manual regulating valve and the HV-C3 manual regulating valve are arranged in sequence from the air compression station to the compressed air inlet;

[0027] The gas supply main pipe between the PG240304 pressure gauge and the HV-C2 manual regulating valve is connected to the gas supply branch pipe, and manual valves are respectively provided on the multiple gas supply branch pipes to control on and off.

[0028] A sludge combustible gas hot blast furnace ignition control method comprises the following steps:

[0029] Step 1: Preparation before ignition:

[0030] Step 1.1, air compressor station, combustion and ignition system test:

[0031] Step 1.1a, air compressor station system test: start the air compressor station, open the HV-C1 manual regulating valve, and observe on-site that the PG240304 pressure gauge displays normal;

[0032] Step 1.1b, combustion-supporting system test: manually open the HV-A1 manual regulating valve to 60%, open the HV-A2 manual regulating valve to 60%; manually start the combustion-supporting fan in the control cabinet and adjust the frequency to 40Hz, check the pressure displayed by the PG240301 pressure gauge on site, and the display range is 3-4Kpa, and close it when it is normal;

[0033] Step 1.1c, ignition system test: manually open the HV-A3 manual regulating valve to 100%, open the HV-A4 manual regulating valve to 20%; manually start the ignition fan in the control cabinet and check the operation status, check the pressure displayed by the PG240309 pressure gauge on site, the display range is 9-10Kpa, and close it when it is normal;

[0034] Step 1.1d, test completed, waiting for ignition;

[0035] Step 1.2: Release natural gas:

[0036] Step 1.2a, manually open the HV-L1 manual regulating valve, check the pressure of the PG240305 pressure gauge on site, and it should show 0.1Mpa;

[0037] Step 1.2b, manually open the HV-L2 manual regulating valve, adjust the main PCV240301 natural gas pressure reducing valve, check the pressure of the PG240306 pressure gauge on site, and it should be 5Kpa;

[0038] Step 1.2c, manually open the HV-L4 manual regulating valve, adjust the branch pipe PCV240302 natural gas pressure reducing valve, check the pressure of the PG240308 pressure gauge on site, and it should be 5Kpa;

[0039] Step 1.2d, manually open the HV-L8 manual relief valve and the HV-L7 manual relief valve, and confirm that the HV-L3 manual regulating valve and the HV-L6 manual regulating valve are closed;

[0040] Step 1.2e, the control cabinet manually opens the XV240303 main solenoid valve and the XV240304 main solenoid valve, opens the TV240301 pneumatic regulating valve to 100%, and the control cabinet manually opens the SV240302 branch pipe solenoid valve to release the natural gas for 5 minutes;

[0041] Step 1.2f, close all manual relief valves opened in step 1.2d, close all solenoid valves and pneumatic control valves opened in step 1.2e; open the HV-L3 manual control valve to 50%, and open the HV-L6 manual control valve to 20%;

[0042] Step 1.2g, natural gas release is completed, waiting for ignition;

[0043] Step 1.3, release cracking gas:

[0044] Step 1.3a, manually open the HV-G1 manual regulating valve, check the pressure of the PG240302 pressure gauge on site, and the displayed range is 10-20Kpa;

[0045] Step 1.3b, manually open the HV-G2 manual regulating valve and the HV-G3 manual regulating valve to 50%, open the HV-G4 manual regulating valve to 20%, and open the HV-G6 manual relief valve;

[0046] At the same time, the PT240302 pressure transmitter is pre-set with a low pressure protection value of 2Kpa. If the detection pressure is 3-4Kpa, the pressure is normal and meets the ignition condition one; if the detection pressure is lower than 2Kpa, an alarm will be output, and the cause will be checked. The alarm will be automatically released after the pressure is normal;

[0047] Step 1.3c, manually open the HV-G5 manual relief valve and confirm that the HV-G4 manual regulating valve is closed;

[0048] Step 1.3d, the control cabinet manually opens the cracking gas XV240301 pneumatic switch valve, the cracking gas XV240302 pneumatic switch valve, and opens the cracking gas PV240302 pneumatic regulating valve and the cracking gas HV240301 pneumatic regulating valve to 100%, and releases the cracking gas for 5 minutes;

[0049] Step 1.3e, close all opened manual relief valves in step 1.3c, close all opened pneumatic switch valves and pneumatic regulating valves in step 1.3d, and open the HV-G4 manual regulating valve to 50%;

[0050] Step 1.3f, the cracking gas is released and waiting for ignition;

[0051] Step 2: Leak detection of natural gas system and cracking gas system and start-up of ignition and combustion-supporting system:

[0052] Step 2.1, natural gas system leak detection:

[0053] Step 2.1a, prepare for natural gas valve leak detection: automatically open the cracking gas HV240301 pneumatic regulating valve to 50%, automatically open the cracking gas XV240302 pneumatic switch valve, and automatically open the natural gas TV240301 pneumatic regulating valve to 20%;

[0054] Step 2.1b, perform natural gas valve leak detection: automatically open the natural gas XV240303 main solenoid valve for 3 seconds and then close it, and use the PT240304 pressure transmitter to detect the pressure change for 3 seconds after the XV240303 main solenoid valve is closed;

[0055] Step 2.1c: If the PT240304 pressure transmitter detects no pressure during the opening of the natural gas XV240303 main solenoid valve, the leak detection is successful; if the PT240304 pressure transmitter detects pressure, the leak detection fails and an alarm is output. At the same time, the XV240303 main solenoid valve is closed, the cause is checked and the process returns to step 2.1a.

[0056] Step 2.1d, perform natural gas valve leak detection again: automatically open the natural gas XV240304 main solenoid valve and close it after 3s, and use the PT240304 pressure transmitter to detect the pressure change after the XV240304 main solenoid valve is closed for 3s;

[0057] Step 2.1e: If the PT240304 pressure transmitter detects no pressure during the opening of the natural gas XV240304 main solenoid valve, the leak detection is successful; if the PT240304 pressure transmitter detects pressure, the leak detection fails and an alarm is output. At the same time, the XV240304 main solenoid valve is closed, the cause is checked and the process returns to step 2.1a.

[0058] Step 2.1f, open the natural gas XV240304 main solenoid valve, and the PT240304 pressure transmitter detects a normal pressure of 5Kpa, meeting the ignition condition three;

[0059] Step 2.2, cracking gas system leak detection:

[0060] Step 2.2a, prepare cracking gas valve leak detection: automatically close the cracking gas XV240302 pneumatic switch valve, open the cracking gas PV240302 pneumatic regulating valve to 50%;

[0061] Step 2.2b, perform cracking gas valve leak detection: automatically open the cracking gas XV240302 pneumatic switch valve and close it after 5s, and use the PT240303 pressure transmitter to detect the pressure change after the cracking gas XV240302 pneumatic switch valve is closed;

[0062] Step 2.2c: If the PT240303 pressure transmitter detects no pressure during the opening of the cracking gas XV240302 pneumatic switch valve, the leak detection is passed; if the PT240303 pressure transmitter detects pressure, the leak detection fails and an alarm is output, and the XV240302 pneumatic switch valve is closed at the same time, the cause is checked and the return is made to step 2.1a;

[0063] Step 2.2d, perform cracking gas valve leak detection again: automatically open the XV240301 pneumatic switch valve and close it after 5s, and use the PT240303 pressure transmitter to detect the pressure change after the cracking gas XV240301 pneumatic switch valve is closed;

[0064] Step 2.2e, if the PT240303 pressure transmitter detects no pressure during the opening of the cracking gas XV240301 pneumatic switch valve, the leak detection is passed; if the PT240303 pressure transmitter detects pressure, the leak detection fails and an alarm is output, and the XV240301 pneumatic switch valve is closed at the same time, the cause is checked and the return is made to step 2.1a;

[0065] Step 2.2f, open the XV240301 pneumatic switch valve to meet ignition condition four;

[0066] Step 2.3, ignition and combustion support system start:

[0067] Step 2.3a: Automatically start the ignition fan. If there is no return operation signal after 5 seconds after starting, the output alarm program stops, check the cause, and return to step 2.3a.

[0068] Step 2.3b, automatically start the combustion-supporting fan, adjust the frequency to 40Hz, automatically open the FV240301 pneumatic regulating valve to 20%, and pre-set the low pressure protection value of 2Kpa for the PT240301 pressure transmitter. If the detection pressure is 3-4Kpa, the pressure is normal and meets the ignition condition 2; if the detection pressure is lower than 2Kpa, the output alarm program stops, check the cause, and return to step 2.3a;

[0069] Step 3: Ignition of hot air furnace:

[0070] Step 3.1, after the four ignition conditions are met, start the pre-ignition purge: automatically open the FV240301 pneumatic regulating valve to 100%, purge for 180s and then close to 10% ignition opening;

[0071] Step 3.2, automatically open the IT-601 ignition transformer and IP-601 ignition electrode to discharge for 8 seconds, automatically open the SV240302 branch pipe solenoid valve for 3 seconds to ignite, and the BE-601UV probe detects the flame;

[0072] If the BE-601UV probe fails to detect flame, the SV240302 branch pipe solenoid valve will be automatically closed, and the ignition will be repeated 1-2 times after an interval of 5 seconds. After the flame is detected, the program will continue. If the BE-601UV probe still fails to detect flame, an alarm will be issued and the SV240302 branch pipe solenoid valve will be automatically closed. Check the cause and return to step 3.1.

[0073] When the BE-601UV probe detects a flame, the SV240302 branch pipe solenoid valve is normally open, and the cracking gas HV240301 pneumatic regulating valve is automatically opened to 15%, and the cracking gas XV240302 pneumatic switch valve is automatically opened for 10 seconds, and the BE-602UV probe detects the flame;

[0074] Step 3.3, if the BE-602UV probe does not detect a flame, the cracking gas XV240302 pneumatic switch valve is automatically closed, and after an interval of 15 seconds, the cracking gas XV240302 pneumatic switch valve is opened again for 10 seconds. After the flame is detected, the program continues;

[0075] If the BE-602UV probe still fails to detect a flame, an alarm is sounded and the cracking gas XV240302 pneumatic switch valve is automatically closed. Then, any of the following operations is performed: Operation 1: Check the cause and return to step 3.1; Operation 2: Switch the XV240302 pneumatic switch valve to manual mode, the program is paused, and after checking the cause, the XV240302 pneumatic switch valve is manually opened. After the BE-602UV probe detects a flame, the XV240302 pneumatic switch valve is switched to automatic mode, and the program continues.

[0076] The BE-602UV probe detects the flame, the cracking gas XV240302 pneumatic switch valve is normally open, and the cracking gas HV240301 pneumatic regulating valve is automatically opened to full open and then switched to manual mode. The ignition is successful and enters the automatic control program.

[0077] Through the above technical solution, the beneficial effects of the present invention are:

[0078] The structure of the present invention is reasonably designed. According to the characteristics of the sludge combustible gas, the conditions for meeting the ignition of the hot blast furnace are determined, and ignition preparation is performed before ignition. In view of the fluctuations in the composition and calorific value of the sludge combustible gas, the ignition furnace temperature is guaranteed by controlling the amount of natural gas during ignition. In view of the fluctuations in the pressure and flow of the sludge combustible gas, the amount of the sludge combustible gas is controlled to ensure that the gas pressure and flow meet the ignition requirements during ignition. The furnace temperature, the amount of sludge combustible gas, the flame and other indicators during ignition are monitored in real time, and the ignition process is terminated even when an abnormality occurs to ensure safety.

[0079] The air compressor station, combustion-supporting and ignition system tests of the present invention can ensure that these functions work normally during the ignition process. The natural gas and cracking gas release test can ensure that the release system can normally realize the release function when an abnormality occurs in the ignition. The natural gas and cracking gas leak detection is to ensure that the natural gas and cracking gas valves can normally realize the cut-off function to prevent the leakage of combustible gas. Alarm and safety interlock: If the natural gas and cracking gas leak detection fails, the ignition process stops, and the ignition command can be accepted again after the fault is eliminated. If the combustion-supporting fan fails, the ignition process stops, and the ignition command can be accepted again after the fault is eliminated. If the PT240301 pressure transmitter is lower than the set protection value, the ignition process stops, and the ignition command can be accepted again after the abnormality is eliminated. When the two fire detections, namely the BE-601UV probe and the BE-602UV probe, fail to detect the flame and continue for a certain period of time, a no-fire alarm is prompted and ignition is attempted again. If the flame cannot be detected after 1-2 attempts, a no-fire fault is reported and the ignition process is stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 The utility model is a schematic diagram of the overall structure of an ignition control system of a sludge combustible gas hot blast furnace of the present invention.

[0081] Figure 2 The invention discloses a hot blast furnace schematic diagram of an ignition control system for a sludge combustible gas hot blast furnace.

[0082] Figure 3 The invention discloses a combustion-supporting system for an ignition control system of a sludge combustible gas hot blast furnace.

[0083] Figure 4 The invention discloses a schematic diagram of a cracking gas system of an ignition control system for a sludge combustible gas hot blast furnace.

[0084] Figure 5The invention discloses a natural gas system schematic diagram of an ignition control system for a sludge combustible gas hot blast furnace.

[0085] Figure 6 The invention discloses an ignition system schematic diagram of an ignition control system for a sludge combustible gas hot blast furnace.

[0086] Figure 7 The present invention is a schematic diagram of an air compression station system of an ignition control system for a sludge combustible gas hot blast furnace.

[0087] Figure 8 The present invention is a control logic flow chart of step 1 of a sludge combustible gas hot blast furnace ignition control method.

[0088] Fig. 9 The present invention is a control logic flow chart of step 2 of a sludge combustible gas hot blast furnace ignition control method.

[0089] Fig.10 This is a control logic flow chart of step 3 of an ignition control method for a sludge combustible gas hot blast furnace of the present invention.

[0090] The reference numerals in the accompanying drawings are: 1 is a furnace body, 2 is a combustion-supporting air inlet, 3 is a cracking gas inlet, 4 is a compressed air inlet, 5 is an igniter, 6 is an ignition gun, 601 is an IT-601 ignition transformer, 602 is an IP-601 ignition electrode, 603 is a BE-601UV probe, 7 is a combustion-supporting fan, 8 is a combustion-supporting air duct, 9 is an HV-A1 manual regulating valve, 10 is a PG240301 pressure gauge, 11 is a PT240301 pressure transmitter, 12 is an FV240301 pneumatic regulating valve, 13 is an HV-A2 manual regulating valve, 14 is a cracking gas source, 15 is a cracking pipeline, 16 is an HV-G1 manual regulating valve, 17 is a PG240301 pressure gauge, 18 is a PT240301 pressure transmitter, 19 is an FV240301 pneumatic regulating valve, 20 is an HV-A2 manual regulating valve, 21 is an HV-G1 manual regulating valve, 22 is an HV-G2 manual regulating valve, 23 is an HV-G3 manual regulating valve, 24 is an HV-G4 manual regulating valve, 25 is an HV-G5 manual regulating valve, 26 is an HV-G6 manual regulating valve, 27 is an HV-G7 manual regulating valve, 28 is an HV-G8 manual regulating valve, 29 is an HV-G9 manual regulating valve, 30 is an HV-G11 manual regulating valve, 31 is an HV-G12 manual regulating valve, 32 is an HV-G13 manual regulating valve, 33 is an HV-G14 manual regulating valve, 34 is an HV-G15 manual 302 pressure gauge, 18 is PT240302 pressure transmitter, 19 is PV240302 pneumatic regulating valve, 20 is XV240301 pneumatic switch valve, 21 is PG240303 pressure gauge, 22 is HV-G2 manual regulating valve, 23 is cracking gas mixer, 24 is HV-G3 manual regulating valve, 25 is PT240303 pressure transmitter, 26 is XV240302 pneumatic switch valve, 27 is HV240301 pneumatic regulating valve, 28 is HV-G4 manual regulating valve, 29 is cracking release pipeline, 30 is HV-G5 manual release valve, 31 is HV-G6 manual release valve, 32 is natural gas source, 33 34 is the natural gas main pipe, 35 is the vent pipe 1, 36 is the vent pipe 2, 37 is the HV-L1 manual regulating valve, 38 is the PG240305 pressure gauge, 39 is the HV-L2 manual regulating valve, 40 is the PCV240301 natural gas pressure reducing valve, 41 is the PG240306 pressure gauge, 42 is the XV240304 main solenoid valve, 43 is the PT240304 pressure transmitter, 44 is the XV240303 main solenoid valve, 45 is the TV240301 pneumatic regulating valve, 46 is the HV-L3 manual regulating valve, 47 is the HV-L4 manual regulating valve, 48 is the PCV240302 natural gas pressure reducing valve, 49 is a PG240308 pressure gauge, 50 is a SV240302 branch pipe solenoid valve, 51 is an HV-L6 manual regulating valve, 52 is an HV-L8 manual relief valve, 53 is an HV-L7 manual relief valve, 54 is an ignition fan, 55 is an ignition pipeline, 56 is a PG240309 pressure gauge, 58 is an HV-A3 manual regulating valve, 59 is an HV-A4 manual regulating valve, 60 is a BE-602UV probe, 61 is an air compressor station, 62 is an air supply main pipe, 63 is an HV-C1 manual regulating valve, 64 is a PG240304 pressure gauge, 65 is a TT240301 thermocouple, and 66 is a TIC240301 temperature display. DETAILED DESCRIPTION

[0091] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0092] like Figure 1 to Figure 7As shown, a sludge combustible gas hot blast furnace ignition control system includes a control cabinet and a hot blast furnace, a combustion-supporting system, a cracking gas system, a natural gas system, an ignition system and an air compression station system respectively connected to the control cabinet, and the control cabinet controls the hot blast furnace, the combustion-supporting system, the cracking gas system, the natural gas system and the ignition system respectively.

[0093] The hot blast furnace comprises a furnace body 1 , a combustion-supporting air inlet 2 , a cracking gas inlet 3 , a compressed air inlet 4 , an igniter 5 and an ignition gun 6 .

[0094] The furnace body 1 is provided with a TT240301 thermocouple 65 for detecting the furnace temperature in the hot blast furnace, with a detection range of 0-1300°C. The furnace body 1 is also provided with a TIC240301 temperature display meter 66 for displaying the furnace temperature in real time. The TT240301 thermocouple 65 and the TIC240301 temperature display meter 66 are both connected to a thermostat, which is installed in a control cabinet.

[0095] Air and natural gas are introduced into the igniter 5, a BE-602 UV probe 60 is provided at the combustion-supporting air inlet 2, and the ignition gun 6 comprises an IT-601 ignition transformer 601, an IP-601 ignition electrode 602 and a BE-601 UV probe 603. The UV probe is used to detect whether a flame is generated, and the parameters of the IT-601 ignition transformer 601 are 220V, 50Hz.

[0096] The combustion-supporting system includes a combustion-supporting fan 7 and a combustion-supporting air duct 8 connecting the combustion-supporting fan 7 and the combustion-supporting air inlet 2, and the combustion-supporting air duct 8 is sequentially provided with an HV-A1 manual regulating valve 9, a PG240301 pressure gauge 10, a PT240301 pressure transmitter 11, an FV240301 pneumatic regulating valve 12 and an HV-A2 manual regulating valve 13.

[0097] The HV-A1 manual regulating valve 9, PG240301 pressure gauge 10, PT240301 pressure transmitter 11, FV240301 pneumatic regulating valve 12 and HV-A2 manual regulating valve 13 are arranged in sequence from the combustion air fan 7 to the combustion air inlet 2.

[0098] HV-A1 manual regulating valve 9 and HV-A2 manual regulating valve 13 are both DN200 manual butterfly valves, used to adjust the opening of the combustion air valve. PG240301 pressure gauge 10 displays the pressure range of 0-16Kpa, which can display the combustion air pressure on site. PT240301 pressure transmitter 11 has parameters of 0-16Kpa, DC24V, which is used to detect pipeline pressure and transmit the pressure signal to the control cabinet.

[0099] The cracking gas system includes a cracking gas source 14 and a cracking pipeline 15 connecting the cracking gas source 14 and the cracking gas inlet 3, and the cracking pipeline 15 is sequentially provided with an HV-G1 manual regulating valve 16, a PG240302 pressure gauge 17, a PT240302 pressure transmitter 18, a PV240302 pneumatic regulating valve 19, an XV240301 pneumatic switch valve 20, a PG240303 pressure gauge 21, an HV-G2 manual regulating valve 22, a cracking gas mixer 23, an HV-G3 manual regulating valve 24, a PT240303 pressure transmitter 25, an XV240302 pneumatic switch valve 26, an HV240301 pneumatic regulating valve 27 and an HV-G4 manual regulating valve 28.

[0100] The HV-G1 manual regulating valve 16, PG240302 pressure gauge 17, PT240302 pressure transmitter 18, PV240302 pneumatic regulating valve 19, XV240301 pneumatic switch valve 20, PG240303 pressure gauge 21, HV-G2 manual regulating valve 22, cracking gas mixer 23, HV-G3 manual regulating valve 24, PT240303 pressure transmitter 25, XV240302 pneumatic switch valve 26, HV240301 pneumatic regulating valve 27 and HV-G4 manual regulating valve 28 are arranged in sequence from the cracking gas source 14 to the cracking gas inlet 3.

[0101] The HV-G1 manual regulating valve 16, HV-G2 manual regulating valve 22, HV-G3 manual regulating valve 24 and HV-G4 manual regulating valve 28 are all DN250 manual turbine butterfly valves, which are used to adjust the cracking gas valve opening. The PG240302 pressure gauge 17 displays a pressure range of 0-25Kpa, and can display the cracking gas pressure on site. The PT240302 pressure transmitter 18 has parameters of 0-25Kpa, DC24V, which is used to detect the pressure of the cracking pipeline 15 and transmit the pressure signal to the control cabinet, thereby controlling the opening of the PV240302 pneumatic regulating valve 19; the PT240302 pressure transmitter 18 is provided with low pressure protection, which is interlocked with the XV240301 pneumatic switch valve 20 for safety. At the same time, the PT240301 pressure transmitter 11 of the combustion-supporting system is set with low pressure protection, which is also interlocked with the XV240301 pneumatic switch valve 20 for safety.

[0102] The parameters of PV240302 pneumatic regulating valve 19 are DC24V, 4-20ma. Combined with PT240302 pressure transmitter 18 and PT240303 pressure transmitter 25, it can adjust the cracking gas inlet pressure. The parameters of XV240301 pneumatic switch valve 20 are AC220V, 50Hz. It is set with low pressure protection, and is safely interlocked with PT240302 and PT240301 pressure transmitter 11. At the same time, it is combined with XV240302 pneumatic switch valve 26 and PT240303 pressure transmitter 25 to achieve valve leakage detection. PG240303 pressure gauge 21 displays a pressure range of 0-25Kpa, and can display the mixed gas pressure on site, that is, the mixed pressure of cracking gas and natural gas. The cracking gas mixer 23 is used to fully mix the cracking gas and natural gas. The parameters of PT240303 pressure transmitter 25 are 0-25Kpa, DC24V, which is used to detect the pressure of cracking pipeline 15 and transmit the pressure signal to the control cabinet, thereby controlling the opening of PV240302 pneumatic regulating valve 19; PT240303 pressure transmitter 25 and XV240301 and XV240302 pneumatic switch valves 26 achieve valve leak detection.

[0103] The parameters of XV240302 pneumatic switch valve 26 are AC220V, 50Hz, and are interlocked with BE-602UV probe 60 for safety, and are combined with XV240301 pneumatic switch valve 20 and PT240303 pressure transmitter 25 to achieve valve leakage detection. The parameters of HV240301 pneumatic regulating valve 27 are DC24V, 4-20ma, and its switch can be controlled through the control cabinet, and is normally open.

[0104] The cracking pipeline 15 between the HV240301 pneumatic regulating valve 27 and the HV-G4 manual regulating valve 28 is connected with a cracking release pipeline 29, and the cracking release pipeline 29 is sequentially provided with an HV-G5 manual release valve 30 and an HV-G6 manual release valve 31. The HV-G5 manual release valve 30 and the HV-G6 manual release valve 31 are both DN40 manual butterfly valves, which are used to release the cracking gas when the furnace is started or stopped.

[0105] The natural gas system includes a natural gas source 32 , a natural gas main pipe 33 connecting the natural gas source 32 and the cracking gas mixer 23 , a natural gas branch pipe 34 , a first vent pipe 35 and a second vent pipe 36 .

[0106] The natural gas main pipe 33 is provided with an HV-L1 manual regulating valve 37, a PG240305 pressure gauge 38, an HV-L2 manual regulating valve 39, a PCV240301 natural gas pressure reducing valve 40, a PG240306 pressure gauge 41, an XV240304 main pipe solenoid valve 42, a PT240304 pressure transmitter 43, an XV240303 main pipe solenoid valve 44, a TV240301 pneumatic regulating valve 45 and an HV-L3 manual regulating valve 46 in sequence.

[0107] The HV-L1 manual regulating valve 37, PG240305 pressure gauge 38, HV-L2 manual regulating valve 39, PCV240301 natural gas pressure reducing valve 40, PG240306 pressure gauge 41, XV240304 main solenoid valve 42, PT240304 pressure transmitter 43, XV240303 main solenoid valve 44, TV240301 pneumatic regulating valve 45 and HV-L3 manual regulating valve 46 are arranged in sequence from the natural gas source 32 to the cracking gas mixer 23.

[0108] The HV-L1 manual regulating valve 37, HV-L2 manual regulating valve 39 and HV-L3 manual regulating valve 46 are all DN40 manual valves, which are used to manually adjust the valve opening on the natural gas main 33. The PG240305 pressure gauge 38 displays a pressure range of 0-1.6Mpa and can display the natural gas pressure on site.

[0109] The PCV240301 natural gas pressure reducing valve 40 is used to reduce the pressure of the natural gas main pipe 33. The PG240306 pressure gauge 41 displays the pressure range of 0-25Kpa, and can display the pressure of the natural gas main pipe 33 after pressure reduction on site. The parameters of the XV240304 main pipe solenoid valve 42 are AC220V, 50Hz, and the valve leak detection is achieved by combining the XV240303 main pipe solenoid valve 44 with the PT240304 pressure transmitter 43.

[0110] The parameters of the PT240304 pressure transmitter 43 are 0-25Kpa, DC24V, and it is set with low pressure protection, which is used to display the pressure of the natural gas main 33 and transmit the pressure signal to the control cabinet. The PT240304 pressure transmitter 43 is safety interlocked with the XV240303 main solenoid valve 44. The parameters of the XV240303 main solenoid valve 44 are AC220V, 50Hz, and the XV240304 main solenoid valve 42 is combined with the PT240304 pressure transmitter 43 to achieve valve leakage detection.

[0111] The parameters of TV240301 pneumatic regulating valve 45 are DC24V, 4-20ma. Combined with TT240301 thermocouple 65, the amount of natural gas replenishment is controlled according to the temperature in the furnace, that is, the opening of natural gas TV240301 pneumatic regulating valve 45 is controlled.

[0112] The natural gas main pipe 33 between the PG240305 pressure gauge 38 and the HV-L2 manual regulating valve 39 is connected to the natural gas branch pipe 34, and the natural gas branch pipe 34 is connected to the igniter 5. The natural gas branch pipe 34 is sequentially provided with an HV-L4 manual regulating valve 47, a PCV240302 natural gas pressure reducing valve 48, a PG240308 pressure gauge 49, an SV240302 branch pipe solenoid valve 50 and an HV-L6 manual regulating valve 51.

[0113] The HV-L4 manual regulating valve 47, PCV240302 natural gas pressure reducing valve 48, PG240308 pressure gauge 49, SV240302 branch pipe solenoid valve 50 and HV-L6 manual regulating valve 51 are arranged in sequence along the natural gas flow direction.

[0114] The HV-L4 manual regulating valve 47 and the HV-L6 manual regulating valve 51 are both DN15 manual valves, which are used to manually adjust the valve opening on the natural gas branch pipe 34. The PCV240302 natural gas pressure reducing valve 48 is used to reduce the pressure of the natural gas branch pipe 34. The PG240308 pressure gauge 49 displays the pressure range of 0-25Kpa, and can display the pressure of the natural gas branch pipe 34 after pressure reduction on site. The parameters of the SV240302 branch pipe solenoid valve 50 are AC220V, 50Hz, and are safety interlocked with the BE-601UV probe 603.

[0115] The natural gas main pipe 33 between the TV240301 pneumatic regulating valve 45 and the HV-L3 manual regulating valve 46 is connected to the vent pipe 1 35, and an HV-L8 manual vent valve 52 is provided on the vent pipe 1 35; the natural gas branch pipe 34 between the SV240302 branch pipe solenoid valve 50 and the HV-L6 manual regulating valve 51 is connected to the vent pipe 2 36, and an HV-L7 manual vent valve 53 is provided on the vent pipe 2 36.

[0116] Specifically, the ends of the vent pipe 1 35 and the vent pipe 2 36 are connected and merged into the cracking vent pipeline 29. The HV-L7 manual vent valve 53 and the HV-L8 manual vent valve 52 are both DN20 manual valves, which are used to release natural gas when starting and stopping the furnace.

[0117] The ignition system includes an ignition fan 54 and an ignition pipeline 55 connecting the ignition fan 54 and the igniter 5. The ignition pipeline 55 is sequentially provided with a PG240309 pressure gauge 56, a HV-A3 manual regulating valve 58, and a HV-A4 manual regulating valve 59. The PG240309 pressure gauge 56, the HV-A3 manual regulating valve 58, and the HV-A4 manual regulating valve 59 are sequentially arranged from the ignition fan 54 to the igniter 5.

[0118] The PG240309 pressure gauge 56 displays a pressure range of 0-25Kpa and can display the ignition air pressure on site. The HV-A3 manual regulating valve 58 and the HV-A4 manual regulating valve 59 are both DN25 manual valves used to manually adjust the opening of the ignition air valve.

[0119] The air compression station system is connected to the compressed air inlet 4, and the air compression station system is also connected to each pneumatic valve to provide the power source required by the pneumatic valve.

[0120] Specifically, the air compressor station system includes an air compressor station 61 and an air supply pipe 62 connecting the air compressor station 61 and the compressed air inlet 4. The air supply pipe 62 is provided with an HV-C1 manual regulating valve 63 and a PG240304 pressure gauge 64 in sequence. The HV-C1 manual regulating valve 63 is a DN25 manual valve; the PG240304 pressure gauge 64 displays a pressure range of 0-1.6Mpa, and can display the compressed air pressure on site.

[0121] The air supply main pipe 62 is also provided with an HV-C2 manual regulating valve and an HV-C3 manual regulating valve. The HV-C1 manual regulating valve 63, the PG240304 pressure gauge 64, the HV-C2 manual regulating valve and the HV-C3 manual regulating valve are arranged in sequence from the air compression station 61 to the compressed air inlet 4.

[0122] The gas supply main pipe 62 is connected to a plurality of gas supply branches, and the gas supply main pipe 62 between the PG240304 pressure gauge 64 and the HV-C2 manual regulating valve is connected to the gas supply branch, and manual valves are respectively provided on the plurality of gas supply branches to control the on-off. The plurality of gas supply branches are respectively connected to the PV240302 pneumatic regulating valve 19, the XV240301 pneumatic switch valve 20, the XV240302 pneumatic switch valve 26, the HV240301 pneumatic regulating valve 27, the FV240301 pneumatic regulating valve 12 and the TV240301 pneumatic regulating valve 45.

[0123] like Figure 8~Figure 10 As shown, a method for controlling the ignition of a sludge combustible gas hot blast furnace comprises the following steps:

[0124] Step 1: Preparation before ignition:

[0125] Step 1.1, air compressor station 61, combustion and ignition system test:

[0126] Step 1.1a, air compressor station system test: start the air compressor station 61, open the HV-C1 manual regulating valve 63, and observe on-site that the PG240304 pressure gauge 64 displays normal.

[0127] Step 1.1b, combustion-supporting system test: manually open the HV-A1 manual regulating valve 9 to 60%, open the HV-A2 manual regulating valve 13 to 60%; manually start the combustion-supporting fan 7 in the control cabinet, adjust the frequency to 40Hz, check the pressure displayed by the PG240301 pressure gauge 10 on site, and the display range is 3-4Kpa, and close it after it is normal.

[0128] Step 1.1c, ignition system test: manually open the HV-A3 manual regulating valve 58 to 100%, open the HV-A4 manual regulating valve 59 to 20%; manually start the ignition fan 54 in the control cabinet and check the operation status, check the pressure displayed by the PG240309 pressure gauge 56 on site, the display range is 9-10Kpa, and close it after it is normal.

[0129] Step 1.1d, test completed, waiting for ignition.

[0130] Step 1.2: Release natural gas:

[0131] Step 1.2a, manually open the HV-L1 manual regulating valve 37, check the pressure of the PG240305 pressure gauge 38 on site, and the pressure displayed is 0.1Mpa.

[0132] Step 1.2b, manually open the HV-L2 manual regulating valve 39, adjust the main PCV240301 natural gas pressure reducing valve 40, check the pressure of the PG240306 pressure gauge 41 on site, and display 5Kpa.

[0133] Step 1.2c, manually open the HV-L4 manual regulating valve 47, adjust the branch pipe PCV240302 natural gas pressure reducing valve 48, check the pressure of the PG240308 pressure gauge 49 on site, and display 5Kpa.

[0134] Step 1.2d, manually open the manual relief valve 52 of the main pipe HV-L8 and the manual relief valve 53 of the branch pipe HV-L7, confirm that the manual regulating valve 46 of the main pipe HV-L3 and the manual regulating valve 51 of the branch pipe HV-L6 are closed, and prepare to release the natural gas.

[0135] Step 1.2e, the control cabinet manually opens the XV240303 main solenoid valve 44 and the XV240304 main solenoid valve 42, opens the TV240301 pneumatic regulating valve 45 to 100%, and manually opens the natural gas SV240302 branch pipe solenoid valve 50 to release the natural gas for 5 minutes.

[0136] Step 1.2f. After the release is completed, close all manual release valves opened in step 1.2d, close all solenoid valves and pneumatic control valves opened in step 1.2e; open the manual control valve of the main pipe HV-L3 by 46 to 50%, and open the manual control valve of the branch pipe HV-L6 by 51 to 20%.

[0137] Step 1.2g, natural gas release is completed, waiting for ignition.

[0138] Step 1.3, release cracking gas:

[0139] Step 1.3a. Manually open the HV-G1 manual regulating valve 16 and check the pressure of the PG240302 pressure gauge 17 on site. The displayed pressure is in the range of 10-20Kpa.

[0140] Step 1.3b, manually open the cracking gas HV-G2 manual regulating valve 22, HV-G3 manual regulating valve 24 to 50%, open the HV-G4 manual regulating valve 28 to 20%, and open the HV-G6 manual relief valve 31.

[0141] At the same time, the PT240302 pressure transmitter 18 pre-sets a low pressure protection value of 2Kpa. If the detection pressure is 3-4Kpa, the pressure is normal and meets the ignition condition one; if the detection pressure is lower than 2Kpa, an alarm is output, the cause is checked, and the alarm is automatically released after the pressure is normal.

[0142] Step 1.3c, manually open the cracking gas HV-G5 manual release valve 30, confirm that the HV-G4 manual regulating valve 28 is closed, and prepare to release the cracking gas.

[0143] Step 1.3d, the control cabinet manually opens the cracking gas XV240301 pneumatic switch valve 20, the cracking gas XV240302 pneumatic switch valve 26, opens the cracking gas PV240302 pneumatic regulating valve 19, and the cracking gas HV240301 pneumatic regulating valve 27 to 100%, and releases the cracking gas for 5 minutes.

[0144] Step 1.3e, after the release is completed, close all the manual release valves opened in step 1.3c, close all the pneumatic switch valves and pneumatic regulating valves opened in step 1.3d, and open the HV-G4 manual regulating valve by 28 to 50%.

[0145] Step 1.3f, cracking gas release is completed, waiting for ignition.

[0146] Step 2: Leak detection of natural gas system and cracking gas system and start-up of ignition and combustion-supporting system:

[0147] Step 2.1, natural gas system leak detection:

[0148] Step 2.1a, prepare for natural gas valve leak detection: automatically open the cracking gas HV240301 pneumatic regulating valve 27 to 50%, automatically open the cracking gas XV240302 pneumatic switch valve 26, and automatically open the natural gas TV240301 pneumatic regulating valve 45 to 20%.

[0149] Step 2.1b, perform natural gas valve leak detection: automatically open the natural gas XV240303 main solenoid valve 44 and then close it after 3s, and the PT240304 pressure transmitter 43 detects the pressure change 3s after the XV240303 main solenoid valve 44 is closed.

[0150] Step 2.1c: If the PT240304 pressure transmitter 43 detects no pressure while the natural gas XV240303 main solenoid valve 44 is open, the leak detection is successful and proceeds to the next step; if the PT240304 pressure transmitter 43 detects pressure, the leak detection fails and an alarm is output. At the same time, the XV240303 main solenoid valve 44 is closed, the cause is checked and the process returns to step 2.1a.

[0151] Step 2.1d, perform natural gas valve leak detection again: automatically open the natural gas XV240304 main solenoid valve 42 and then close it after 3s, and the PT240304 pressure transmitter 43 detects the pressure change 3s after the XV240304 main solenoid valve 42 is closed.

[0152] Step 2.1e, if the PT240304 pressure transmitter 43 detects no pressure while the natural gas XV240304 main solenoid valve 42 is open, the leak detection is successful and proceeds to the next step; if the PT240304 pressure transmitter 43 detects pressure, the leak detection fails and an alarm is output, and the XV240304 main solenoid valve 42 is closed at the same time, the cause is checked and the process returns to step 2.1a.

[0153] Step 2.1f, after the leak detection is successful, open the natural gas XV240304 main solenoid valve 42, and the PT240304 pressure transmitter 43 detects that the pressure is normal 5Kpa, meeting the ignition condition three.

[0154] Step 2.2, cracking gas system leak detection:

[0155] Step 2.2a, prepare cracking gas valve leak detection: automatically close the cracking gas XV240302 pneumatic switch valve 26, and open the cracking gas PV240302 pneumatic regulating valve 19 to 50%.

[0156] Step 2.2b, perform cracking gas valve leak detection: automatically open the cracking gas XV240302 pneumatic switch valve 265s and then close it, and the PT240303 pressure transmitter 25 detects the pressure change after the cracking gas XV240302 pneumatic switch valve 26 is closed.

[0157] Step 2.2c, if the PT240303 pressure transmitter 25 detects no pressure while the cracking gas XV240302 pneumatic switch valve 26 is open, the leak detection passes and proceeds to the next step; if the PT240303 pressure transmitter 25 detects pressure, the leak detection fails and an alarm is output, and the XV240302 pneumatic switch valve 26 is closed at the same time, the cause is checked and return to step 2.1a.

[0158] Step 2.2d, perform cracking gas valve leak detection again: automatically open the XV240301 pneumatic switch valve 205s and then close it, and the PT240303 pressure transmitter 25 detects the pressure change of the cracking gas XV240301 pneumatic switch valve 20 after closing.

[0159] Step 2.2e, if the PT240303 pressure transmitter 25 detects no pressure change during the opening of the cracking gas XV240301 pneumatic switch valve 20, the leak detection is passed and proceeds to the next step; if the PT240303 pressure transmitter 25 detects pressure, the leak detection fails and an alarm is output, and the XV240301 pneumatic switch valve 20 is closed at the same time, the cause is checked and return to step 2.1a.

[0160] Step 2.2f, after the leak test is passed, open the XV240301 pneumatic switch valve 20 to meet the ignition condition four.

[0161] Step 2.3, ignition and combustion support system start:

[0162] Step 2.3a, automatically start the ignition fan 54. If there is no return operation signal after 5 seconds after starting, the output alarm program stops, the cause is checked, and the process returns to step 2.3a.

[0163] Step 2.3b, automatically start the combustion-supporting fan 7, adjust the frequency to 40Hz, automatically open the FV240301 pneumatic regulating valve 12 to 20%, and pre-set the low-pressure protection value of 2Kpa for the PT240301 pressure transmitter 11. If the detection pressure is 3-4Kpa, the pressure is normal and meets the second ignition condition; if the detection pressure is lower than 2Kpa, the output alarm program stops, check the cause, and return to step 2.3a.

[0164] Step 3: Ignition of hot air furnace:

[0165] Step 3.1: After the four ignition conditions are met, start the pre-ignition purge: automatically open the FV240301 pneumatic regulating valve from 12 to 100%, purge for 180 seconds, and then close to 10% ignition opening.

[0166] Step 3.2, automatically open the IT-601 ignition transformer 601 and the IP-601 ignition electrode 602 to discharge for 8 seconds, automatically open the SV240302 branch pipe solenoid valve 503 seconds for ignition, and the BE-601UV probe 603 detects the flame.

[0167] If the BE-601UV probe 603 fails to detect flame, the SV240302 branch pipe solenoid valve 50 is automatically closed, and the ignition is repeated 1-2 times after an interval of 5 seconds. After the flame is detected, the program continues; if the BE-601UV probe 603 still fails to detect flame, an alarm is issued and the SV240302 branch pipe solenoid valve 50 is automatically closed. Check the cause and return to step 3.1.

[0168] When the BE-601UV probe 603 detects a flame, the SV240302 branch pipe solenoid valve 50 is normally open, and the cracking gas HV240301 pneumatic regulating valve 27 to 15% is automatically opened, and the cracking gas XV240302 pneumatic switch valve 2610s is automatically opened, and the BE-602UV probe 60 detects a flame.

[0169] Step 3.3, the BE-602UV probe 60 does not detect a flame, and automatically closes the cracking gas XV240302 pneumatic switch valve 26, and then opens the cracking gas XV240302 pneumatic switch valve 2610s after an interval of 15s. After a flame is detected, the program continues.

[0170] The BE-602UV probe 60 still fails to detect a flame, sounds an alarm and automatically closes the cracking gas XV240302 pneumatic switch valve 26, and then any of the following operations can be performed: Operation 1: Check the cause and return to step 3.1; Operation 2: Switch the XV240302 pneumatic switch valve 26 to manual, the program pauses, check the cause and manually open the XV240302 pneumatic switch valve 26. After the BE-602UV probe 60 detects a flame, the XV240302 pneumatic switch valve 26 switches to automatic and the program continues.

[0171] The BE-602UV probe 60 detects the flame, the cracking gas XV240302 pneumatic switch valve 26 is normally open, and the cracking gas HV240301 pneumatic regulating valve 27 is automatically opened to full open and then switched to manual mode. The ignition is successful and enters the automatic control program. The automatic control program includes furnace pressure control logic and furnace temperature control logic.

[0172] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A sludge combustible gas hot blast furnace ignition control system, comprising a control cabinet and a hot blast furnace, a combustion-supporting system, a cracking gas system, a natural gas system, an ignition system and an air compression station system respectively connected to the control cabinet, characterized in that: The hot air furnace comprises a furnace body (1), a combustion-supporting air inlet (2), a cracking gas inlet (3), a compressed air inlet (4), an igniter (5) and an ignition gun (6); The combustion-supporting system comprises a combustion-supporting fan (7) and a combustion-supporting air duct (8) connecting the combustion-supporting fan (7) and the combustion-supporting air inlet (2); the combustion-supporting air duct (8) is provided with an HV-A1 manual regulating valve (9), a PG240301 pressure gauge (10), a PT240301 pressure transmitter (11), an FV240301 pneumatic regulating valve (12) and an HV-A2 manual regulating valve (13) in sequence; The cracking gas system comprises a cracking gas source (14) and a cracking pipeline (15) connecting the cracking gas source (14) and a cracking gas inlet (3); the cracking pipeline (15) is provided with an HV-G1 manual regulating valve (16), a PG240302 pressure gauge (17), a PT240302 pressure transmitter (18), a PV240302 pneumatic regulating valve (19), an XV240301 pneumatic switch valve (20), a PG240303 pressure gauge (21), an HV-G2 manual regulating valve (22), a cracking gas mixer (23), an HV-G3 manual regulating valve (24), a PT240303 pressure transmitter (25), an XV240302 pneumatic switch valve (26), an HV240301 pneumatic regulating valve (27) and an HV-G4 manual regulating valve (28) in sequence; A cracking release pipeline (29) is connected to the cracking pipeline (15) between the HV240301 pneumatic regulating valve (27) and the HV-G4 manual regulating valve (28), and the cracking release pipeline (29) is provided with an HV-G5 manual release valve (30) and an HV-G6 manual release valve (31) in sequence; The natural gas system comprises a natural gas source (32), a natural gas main pipe (33) connecting the natural gas source (32) and the cracking gas mixer (23), a natural gas branch pipe (34), a first vent pipe (35) and a second vent pipe (36); The natural gas main pipe (33) is provided with an HV-L1 manual regulating valve (37), a PG240305 pressure gauge (38), an HV-L2 manual regulating valve (39), a PCV240301 natural gas pressure reducing valve (40), a PG240306 pressure gauge (41), an XV240304 main pipe solenoid valve (42), a PT240304 pressure transmitter (43), an XV240303 main pipe solenoid valve (44), a TV240301 pneumatic regulating valve (45) and an HV-L3 manual regulating valve (46) in sequence; The natural gas main pipe (33) between the PG240305 pressure gauge (38) and the HV-L2 manual regulating valve (39) is connected to the natural gas branch pipe (34), the natural gas branch pipe (34) is connected to the igniter (5), and the natural gas branch pipe (34) is provided with an HV-L4 manual regulating valve (47), a PCV240302 natural gas pressure reducing valve (48), a PG240308 pressure gauge (49), an SV240302 branch pipe solenoid valve (50) and an HV-L6 manual regulating valve (51) in sequence; The natural gas main pipe (33) between the TV240301 pneumatic regulating valve (45) and the HV-L3 manual regulating valve (46) is connected to the vent pipe 1 (35), and the vent pipe 1 (35) is provided with an HV-L8 manual vent valve (52); the natural gas branch pipe (34) between the SV240302 branch pipe solenoid valve (50) and the HV-L6 manual regulating valve (51) is connected to the vent pipe 2 (36), and the vent pipe 2 (36) is provided with an HV-L7 manual vent valve (53); The ignition system comprises an ignition fan (54) and an ignition pipeline (55) connecting the ignition fan (54) and the igniter (5), and a PG240309 pressure gauge (56), an HV-A3 manual regulating valve (58), and an HV-A4 manual regulating valve (59) are sequentially arranged on the ignition pipeline (55); The air compression station system is connected to the compressed air inlet (4), and the air compression station system is also connected to various pneumatic valves to provide a power source.

2. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: A BE-602 UV probe (60) is provided at the combustion-supporting air inlet (2), and the ignition gun (6) comprises an IT-601 ignition transformer (601), an IP-601 ignition electrode (602) and a BE-601 UV probe (603).

3. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: The HV-A1 manual regulating valve (9), PG240301 pressure gauge (10), PT240301 pressure transmitter (11), FV240301 pneumatic regulating valve (12) and HV-A2 manual regulating valve (13) are arranged in sequence from the combustion air fan (7) to the combustion air inlet (2).

4. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: The HV-G1 manual regulating valve (16), PG240302 pressure gauge (17), PT240302 pressure transmitter (18), PV240302 pneumatic regulating valve (19), XV240301 pneumatic switch valve (20), PG240303 pressure gauge (21), HV-G2 manual regulating valve (22), cracking gas mixer (23), HV-G3 manual regulating valve (24), PT240303 pressure transmitter (25), XV240302 pneumatic switch valve (26), HV240301 pneumatic regulating valve (27) and HV-G4 manual regulating valve (28) are arranged in sequence from the cracking gas source (14) to the cracking gas inlet (3).

5. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: The HV-L1 manual regulating valve (37), the PG240305 pressure gauge (38), the HV-L2 manual regulating valve (39), the PCV240301 natural gas pressure reducing valve (40), the PG240306 pressure gauge (41), the XV240304 main solenoid valve (42), the PT240304 pressure transmitter (43), the XV240303 main solenoid valve (44), the TV240301 pneumatic regulating valve (45) and the HV-L3 manual regulating valve (46) are arranged in sequence from the natural gas source (32) to the cracked gas mixer (23); The HV-L4 manual regulating valve (47), the PCV240302 natural gas pressure reducing valve (48), the PG240308 pressure gauge (49), the SV240302 branch pipe solenoid valve (50) and the HV-L6 manual regulating valve (51) are arranged in sequence along the natural gas flow direction; The ends of the first release pipe (35) and the second release pipe (36) are connected and then merged into the cracking release pipeline (29).

6. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: The PG240309 pressure gauge (56), the HV-A3 manual regulating valve (58) and the HV-A4 manual regulating valve (59) are arranged in sequence from the ignition fan (54) to the igniter (5).

7. The ignition control system of a sludge combustible gas hot blast furnace according to claim 1, characterized in that: The air compression station system comprises an air compression station (61) and an air supply main pipe (62) connecting the air compression station (61) and a compressed air inlet (4); an HV-C1 manual regulating valve (63) and a PG240304 pressure gauge (64) are arranged on the air supply main pipe (62) in sequence; a plurality of air supply branch pipes are connected to the air supply main pipe (62); the plurality of air supply branch pipes are respectively connected to a PV240302 pneumatic regulating valve (19), an XV240301 pneumatic switch valve (20), an XV240302 pneumatic switch valve (26), an HV240301 pneumatic regulating valve (27), an FV240301 pneumatic regulating valve (12) and a TV240301 pneumatic regulating valve (45).

8. The ignition control system for a sludge combustible gas hot blast furnace according to claim 7, characterized in that: The air supply main pipe (62) is also provided with an HV-C2 manual regulating valve and an HV-C3 manual regulating valve, and the HV-C1 manual regulating valve (63), the PG240304 pressure gauge (64), the HV-C2 manual regulating valve and the HV-C3 manual regulating valve are arranged in sequence from the air compression station (61) to the compressed air inlet (4); The gas supply main pipe (62) between the PG240304 pressure gauge (64) and the HV-C2 manual regulating valve is connected to the gas supply branch pipe, and manual valves are respectively provided on the multiple gas supply branch pipes to control on and off.

9. A sludge combustible gas hot blast furnace ignition control method based on a sludge combustible gas hot blast furnace ignition control system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Preparation before ignition: Step 1.1, air compressor station (61), combustion and ignition system test: Step 1.1a, air compressor station system test: start the air compressor station (61), open the HV-C1 manual regulating valve (63), and observe on-site that the PG240304 pressure gauge (64) shows normal; Step 1.1b, combustion-supporting system test: manually open the HV-A1 manual regulating valve (9) to 60%, open the HV-A2 manual regulating valve (13) to 60%; manually start the combustion-supporting fan (7) in the control cabinet, adjust the frequency to 40Hz, check the pressure displayed by the PG240301 pressure gauge (10) on site, and check the display range of 3-4Kpa. If normal, close it; Step 1.1c, ignition system test: manually open the HV-A3 manual regulating valve (58) to 100%, open the HV-A4 manual regulating valve (59) to 20%; manually start the ignition fan (54) in the control cabinet and check the operation status, check the pressure displayed by the PG240309 pressure gauge (56) on site, the display range is 9-10Kpa, and close it if it is normal; Step 1.1d, test completed, waiting for ignition; Step 1.2: Release natural gas: Step 1.2a, manually open the HV-L1 manual regulating valve (37), check the pressure of the PG240305 pressure gauge (38) on site, and the pressure displayed is 0.1Mpa; Step 1.2b, manually open the HV-L2 manual regulating valve (39), adjust the main PCV240301 natural gas pressure reducing valve (40), check the pressure of the PG240306 pressure gauge (41) on site, and the pressure displayed is 5Kpa; Step 1.2c, manually open the HV-L4 manual regulating valve (47), adjust the branch pipe PCV240302 natural gas pressure reducing valve (48), check the pressure of the PG240308 pressure gauge (49) on site, and display 5Kpa; Step 1.2d, manually open the HV-L8 manual relief valve (52) and the HV-L7 manual relief valve (53), and confirm that the HV-L3 manual regulating valve (46) and the HV-L6 manual regulating valve (51) are closed; Step 1.2e, the control cabinet manually opens the XV240303 main solenoid valve (44) and the XV240304 main solenoid valve (42), opens the TV240301 pneumatic control valve (45) to 100%, and manually opens the SV240302 branch pipe solenoid valve (50) to release the natural gas for 5 minutes; Step 1.2f, close all manual relief valves opened in step 1.2d, close all solenoid valves and pneumatic control valves opened in step 1.2e; open the HV-L3 manual control valve (46) to 50%, and open the HV-L6 manual control valve (51) to 20%; Step 1.2g, natural gas release is completed, waiting for ignition; Step 1.3, release cracking gas: Step 1.3a, manually open the HV-G1 manual regulating valve (16), check the pressure of the PG240302 pressure gauge (17) on site, and the displayed pressure is in the range of 10-20Kpa; Step 1.3b, manually open the HV-G2 manual regulating valve (22) and the HV-G3 manual regulating valve (24) to 50%, open the HV-G4 manual regulating valve (28) to 20%, and open the HV-G6 manual relief valve (31); At the same time, the PT240302 pressure transmitter (18) is pre-set with a low pressure protection value of 2Kpa. If the detection pressure is 3-4Kpa, the pressure is normal, and the ignition condition 1 is met; if the detection pressure is lower than 2Kpa, an alarm is output, and the cause is checked. The alarm is automatically released after the pressure is normal; Step 1.3c, manually open the HV-G5 manual relief valve (30) and confirm that the HV-G4 manual regulating valve (28) is closed; Step 1.3d, the control cabinet manually opens the cracking gas XV240301 pneumatic switch valve (20) and the cracking gas XV240302 pneumatic switch valve (26), opens the cracking gas PV240302 pneumatic regulating valve (19) and the cracking gas HV240301 pneumatic regulating valve (27) to 100%, and releases the cracking gas for 5 minutes; Step 1.3e, close all opened manual relief valves in step 1.3c, close all opened pneumatic switch valves and pneumatic regulating valves in step 1.3d, and open the HV-G4 manual regulating valve (28) to 50%; Step 1.3f, the cracking gas is released and waiting for ignition; Step 2: Leak detection of natural gas system and cracking gas system and start-up of ignition and combustion-supporting system: Step 2.1, natural gas system leak detection: Step 2.1a, prepare for natural gas valve leak detection: automatically open the cracked gas HV240301 pneumatic regulating valve (27) to 50%, automatically open the cracked gas XV240302 pneumatic switch valve (26), and automatically open the natural gas TV240301 pneumatic regulating valve (45) to 20%; Step 2.1b, perform natural gas valve leak detection: automatically open the natural gas XV240303 main solenoid valve (44) for 3 seconds and then close it, and the PT240304 pressure transmitter (43) detects the pressure change 3 seconds after the XV240303 main solenoid valve (44) is closed; Step 2.1c: If the PT240304 pressure transmitter (43) detects no pressure while the natural gas XV240303 main solenoid valve (44) is open, the leak detection is successful; if the PT240304 pressure transmitter (43) detects pressure, the leak detection fails and an alarm is output, and the XV240303 main solenoid valve (44) is closed at the same time, the cause is checked and the process returns to step 2.1a; Step 2.1d, perform a natural gas valve leak test again: automatically open the natural gas XV240304 main solenoid valve (42) and close it after 3 seconds, and use the PT240304 pressure transmitter (43) to detect the pressure change after the XV240304 main solenoid valve (42) is closed for 3 seconds; Step 2.1e: If the PT240304 pressure transmitter (43) detects no pressure while the natural gas XV240304 main solenoid valve (42) is open, the leak detection is successful; if the PT240304 pressure transmitter (43) detects pressure, the leak detection fails and an alarm is output, and the XV240304 main solenoid valve (42) is closed at the same time, the cause is checked and the process returns to step 2.1a; Step 2.1f, open the natural gas XV240304 main solenoid valve (42), and the PT240304 pressure transmitter (43) detects that the pressure is normal 5Kpa, meeting the ignition condition three; Step 2.2, cracking gas system leak detection: Step 2.2a, prepare cracking gas valve leak detection: automatically close the cracking gas XV240302 pneumatic switch valve (26), and open the cracking gas PV240302 pneumatic regulating valve (19) to 50%; Step 2.2b, perform cracking gas valve leak detection: automatically open the cracking gas XV240302 pneumatic switch valve (26) and close it after 5 seconds, and use the PT240303 pressure transmitter (25) to detect the pressure change after the cracking gas XV240302 pneumatic switch valve (26) is closed; Step 2.2c: If the PT240303 pressure transmitter (25) detects no pressure during the opening of the cracking gas XV240302 pneumatic switch valve (26), the leak detection is successful; if the PT240303 pressure transmitter (25) detects pressure, the leak detection fails and an alarm is output, and the XV240302 pneumatic switch valve (26) is closed at the same time, the cause is checked and the process returns to step 2.1a. Step 2.2d, perform cracking gas valve leak detection again: automatically open the XV240301 pneumatic switch valve (20) and close it after 5 seconds, and use the PT240303 pressure transmitter (25) to detect the pressure change of the cracking gas XV240301 pneumatic switch valve (20) after closing; Step 2.2e: If the PT240303 pressure transmitter (25) detects no pressure during the opening of the cracking gas XV240301 pneumatic switch valve (20), the leak detection is passed; if the PT240303 pressure transmitter (25) detects pressure, the leak detection fails and an alarm is output, and the XV240301 pneumatic switch valve (20) is closed at the same time, the cause is checked and the process returns to step 2.1a. Step 2.2f, open the XV240301 pneumatic switch valve (20) to meet the ignition condition four; Step 2.3, ignition and combustion support system start: Step 2.3a, automatically start the ignition fan (54). If there is no return operation signal after 5 seconds after the start, the output alarm program stops, the cause is checked, and the process returns to step 2.3a; Step 2.3b, automatically start the combustion-supporting fan (7), adjust the frequency to 40Hz, automatically open the FV240301 pneumatic regulating valve (12) to 20%, and pre-set the low pressure protection value of 2Kpa for the PT240301 pressure transmitter (11). If the detection pressure is 3-4Kpa, the pressure is normal and meets the second ignition condition; if the detection pressure is lower than 2Kpa, the output alarm program stops, check the cause, and return to step 2.3a; Step 3: Ignition of hot air furnace: Step 3.1, after the four ignition conditions are met, start the pre-ignition purge: automatically open the FV240301 pneumatic control valve (12) to 100%, purge for 180 seconds, and then close to 10% ignition opening; Step 3.2, automatically open the IT-601 ignition transformer (601) and the IP-601 ignition electrode (602) to discharge for 8 seconds, automatically open the SV240302 branch pipe solenoid valve (50) for 3 seconds to ignite, and the BE-601 UV probe (603) detects the flame; If the BE-601UV probe (603) fails to detect flame, the SV240302 branch pipe solenoid valve (50) is automatically closed, and the ignition is repeated 1-2 times after an interval of 5 seconds. After the flame is detected, the program continues; if the BE-601UV probe (603) still fails to detect flame, an alarm is issued and the SV240302 branch pipe solenoid valve (50) is automatically closed. Check the cause and return to step 3.1; When the BE-601UV probe (603) detects a flame, the SV240302 branch pipe solenoid valve (50) is normally open, and the cracking gas HV240301 pneumatic regulating valve (27) is automatically opened to 15%, and the cracking gas XV240302 pneumatic switch valve (26) is automatically opened for 10 seconds, and the BE-602UV probe (60) detects a flame; Step 3.3, if the BE-602UV probe (60) does not detect a flame, the cracking gas XV240302 pneumatic switch valve (26) is automatically closed, and after an interval of 15 seconds, the cracking gas XV240302 pneumatic switch valve (26) is opened again for 10 seconds, and the program continues after a flame is detected; The BE-602UV probe (60) still fails to detect a flame, sounds an alarm and automatically closes the cracking gas XV240302 pneumatic switch valve (26), and then performs any of the following operations: Operation 1: Check the cause and return to step 3.1; Operation 2: Switch the XV240302 pneumatic switch valve (26) to manual mode, the program is paused, and after checking the cause, manually open the XV240302 pneumatic switch valve (26). After the BE-602UV probe (60) detects a flame, the XV240302 pneumatic switch valve (26) is switched to automatic mode, and the program continues; The BE-602UV probe (60) detects the flame, the cracking gas XV240302 pneumatic switch valve (26) is normally open, and the cracking gas HV240301 pneumatic regulating valve (27) is automatically opened to full open and then switched to manual mode. The ignition is successful and the automatic control program is entered.

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