Heating furnace burner control device

Abstract

The utility model relates to a heating furnace burner control device, which is characterized in that the input end of a total gas regulating valve is connected with a mixed gas pipeline, the output end of the total gas regulating valve is connected with a plurality of subsection gas pipelines, and each subsection gas pipeline is sequentially connected with a subsection gas regulating valve I, a subsection gas butterfly valve and a subsection gas regulating valve II; and the output end of the second sectional gas regulating valve is connected with the gas inlet of the burner of the corresponding section through a pipeline. The utility model has the advantages that the PLC master station gives opening instructions to the second segmented gas regulating valve, the first segmented gas regulating valve, the total gas regulating valve, the total air regulating valve, the first segmented air regulating valve and the second segmented air regulating valve through the HMI human-computer interaction screen, so that the opening of the regulating valves is adjusted, the opening of a hand valve does not need to be manually adjusted on site, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating furnaces, in particular to a burner control device for a heating furnace. Background Art

[0002] The heating furnace is one of the main energy-consuming equipment in the steel rolling process of steel enterprises. The main function of the heating furnace is to heat steel billets of various specifications, and enter the rolling mill to be rolled into steel after meeting the corresponding rolling temperature. The burner is the heating device of the heating furnace, which plays a vital role in the safe operation of the heating furnace. In some hot-rolled steel workshops, the fuel mixed gas and combustion-supporting air provide heat by manually opening and closing the valve in front of the burner. The operating personnel manually adjust the valve opening on site to adjust the flow of the mixed gas and combustion-supporting air. The flow adjustment of the mixed gas and combustion-supporting air is inaccurate and untimely, and the control opening accuracy is insufficient, resulting in energy waste. Summary of the invention

[0003] The utility model aims to provide a burner control device for a heating furnace, in which a manual valve is eliminated, and regulating valves and gate valves are added to a mixed coal gas pipeline, a combustion-supporting air pipeline, and a central air pipeline, and the regulating valves and gate valves are connected to a control unit. An operator can operate the control device through an HMI human-machine interaction screen in a central control room to adjust the flow of the mixed coal gas and the combustion-supporting air, without the need to manually adjust the opening of the manual valve on site.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A heating furnace burner control device comprises a burner, a second segmented gas regulating valve, a segmented gas butterfly valve, a first segmented gas regulating valve, a total gas regulating valve, a total air regulating valve, a first segmented air regulating valve, a segmented air gate valve, a second segmented air regulating valve, a central air gate valve, a main circuit, and a control unit. The input end of the total gas regulating valve is connected to a mixed gas pipeline, and the output end of the total gas regulating valve is connected to a plurality of segmented gas pipelines. Each segmented gas pipeline is sequentially connected with the first segmented gas regulating valve, the segmented gas butterfly valve, and the second segmented gas regulating valve. The output end of the gas regulating valve 2 is connected to the gas inlet of the burner of the corresponding section through a pipeline; the input end of the main air regulating valve is connected to the combustion-supporting air pipeline, and the output end of the main air regulating valve is connected to a plurality of segmented combustion-supporting pipelines, each of which is sequentially connected with a segmented air regulating valve 1, a segmented air gate valve, and a segmented air regulating valve 2, and the output end of the segmented air regulating valve 2 is connected to the air inlet 1 of the burner of the corresponding section through a pipeline; the output end of the main air regulating valve is connected to the air inlet 2 of the burner of the corresponding section through a pipeline via a central air gate valve;

[0006] The sectional gas butterfly valve, sectional air gate valve and central air gate valve are connected to the main circuit of the corresponding section; the sectional gas regulating valve 2, sectional gas butterfly valve, sectional gas regulating valve 1, total gas regulating valve, total air regulating valve, sectional air regulating valve 1, sectional air gate valve, sectional air regulating valve 2 and central air gate valve are connected to the control unit of the corresponding section; the main circuit of the corresponding section and the control unit of the corresponding section are connected.

[0007] The main gas regulating valve is a pneumatic regulating valve, the section gas regulating valve one is a pneumatic regulating valve, the section gas regulating valve two is an electric regulating valve, the main air regulating valve is an electric regulating valve, and the section air regulating valve one and the section air regulating valve two are both electric regulating valves.

[0008] The main circuit includes main circuit one, main circuit two and main circuit three. The input ends of main circuit one, main circuit two and main circuit three are all connected to the three-phase AC power supply. Main circuit one, main circuit two and main circuit three all include an overheating relay, a forward contactor and a circuit breaker connected to the valve motor in sequence. Main circuit one, main circuit two and main circuit three also include a reverse contactor. The main contacts of the forward contactor are connected between the three-phase AC power supply and the valve motor to form a forward connection mode. The main contacts of the reverse contactor are connected between the three-phase AC power supply and the valve motor to form a reverse connection mode. Main circuit one, main circuit two and main circuit three are all connected to the control unit; the valve motor includes a segmented gas butterfly valve motor, a segmented air gate valve motor and a central air gate valve motor, which are respectively used to drive the switching actions of the segmented gas butterfly valve, the segmented air gate valve and the central air gate valve.

[0009] The control unit includes a digital input module, a digital output module, an analog input module, an analog output module, a communication module, and a power module. The digital input module, the digital output module, the analog input module, the analog output module, the communication module, and the power module are connected through ports. The power module is used to provide working power. The normally open auxiliary contacts of the forward contactor, the normally open auxiliary contacts of the reverse contactor, the normally open auxiliary contacts of the overheating relay, and the normally open auxiliary contacts of the circuit breaker are respectively connected to the digital input module through ports. The digital output module is connected to the relay group. The coils are connected through ports, and the normally open contacts of the relay group are respectively connected to the coils of the forward contactor and the reverse contactor; the analog output modules are respectively connected to the input ends of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the main gas regulating valve, the main air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2, and the analog input modules are respectively connected to the output ends of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the main gas regulating valve, the main air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2; the communication module is used to connect to the PLC master station.

[0010] A relay group includes several relays.

[0011] The control unit is PLC.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The PLC master station gives opening instructions to the segmented gas regulating valve 2, segmented gas regulating valve 1, total gas regulating valve, total air regulating valve, segmented air regulating valve 1, and segmented air regulating valve 2 through the HMI human-machine interactive screen to adjust the opening of the regulating valve. There is no need to manually adjust the opening of the manual valve on site, saving time and effort.

[0014] 2. The PLC master station gives the gas butterfly valve motor, the sectional air gate valve motor, and the central air gate valve motor forward and reverse commands through the HMI human-machine interactive screen. There is no need to manually start the equipment on site, and the operation is convenient;

[0015] 3. The analog input module is respectively connected to the output ends of the segmented gas regulating valve 2, segmented gas regulating valve 1, total gas regulating valve, total air regulating valve, segmented air regulating valve 1, and segmented air regulating valve 2. The operator can check the opening of the regulating valve on the HMI human-machine interaction screen at any time. The operation is intuitive, convenient and fast.

[0016] 4. The digital output module is connected to the relay group, and the normally open contact of the relay group is connected to the coil of the contactor to prevent the contactor from short-circuiting and burning the digital output module. The structure is simple and easy to promote;

[0017] 5. Use a total gas pneumatic quick-cut regulating valve to adjust the fuel flow rate during normal production and to quickly cut off the gas in an accident state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the burner control device of the heating furnace.

[0019] In the figure: 1- main gas pneumatic quick cut-off regulating valve 2- section gas pneumatic regulating valve 3- section gas butterfly valve 4- section gas electric regulating valve 5- burner 6- center air gate valve 7- main air electric regulating valve 8- section air electric regulating valve one 9- section air gate valve 10- section air electric regulating valve two. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0021] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0022] [Example 1]

[0023] See Figure 1A heating furnace burner 5 control device comprises a burner 5, a segmented gas electric regulating valve 4, a segmented gas butterfly valve 3, a segmented gas pneumatic regulating valve 2, a total gas pneumatic quick cut-off regulating valve 1, a total air electric regulating valve 7, a segmented air electric regulating valve 1 8, a segmented air gate valve 9, a segmented air electric regulating valve 2 10, a central air gate valve 6, a main circuit, and a control unit. The input end of the total gas pneumatic quick cut-off regulating valve 1 is connected to a mixed gas pipeline, and the output end of the total gas pneumatic quick cut-off regulating valve 1 is respectively connected to a lower heating section gas pipeline, a lower soaking section gas pipeline, an upper heating section gas pipeline, and an upper soaking section gas pipeline. The input end of the total air electric regulating valve 7 is connected to a combustion-supporting air pipeline. The total air electric regulating valve 7 The output ends are respectively connected to the lower heating section gas pipeline, the lower equalizing section gas pipeline, the upper heating section gas pipeline, and the upper equalizing section gas pipeline, wherein the lower heating section gas pipeline is sequentially connected with the Ⅰ# segmented gas pneumatic regulating valve 2, the Ⅰ# segmented gas butterfly valve 3, and the Ⅰ# segmented gas electric regulating valve 4, and the output end of the Ⅰ# segmented gas electric regulating valve 4 is connected to the gas inlet of the burner 5 of the lower heating section through a pipeline, and the lower heating section combustion-supporting pipeline is sequentially connected with the Ⅰ# segmented air electric regulating valve 1 8, the Ⅰ# segmented air gate valve 9, and the Ⅰ# segmented air electric regulating valve 2 10, and the output end of the Ⅰ# segmented air electric regulating valve 2 10 is connected to the air inlet 1 of the burner 5 of the lower heating section through a pipeline; the output end of the total air electric regulating valve 7 The central air gate valve 6 is connected to the air inlet 2 of the burner 5 of the lower heating section through a pipeline; wherein, the lower heat-averaging section gas pipeline is connected in sequence with the Ⅱ# segmented gas pneumatic regulating valve 2, Ⅱ# segmented gas butterfly valve 3, and Ⅱ# segmented gas electric regulating valve 4, and the output end of the Ⅱ# segmented gas electric regulating valve 4 is connected to the gas inlet of the burner 5 of the lower heat-averaging section through a pipeline, and the lower heat-averaging section combustion-supporting pipeline is connected in sequence with the Ⅱ# segmented air electric regulating valve 1 8, Ⅱ# segmented air gate valve 9, and Ⅱ# segmented air electric regulating valve 2 10, and the output end of the Ⅱ# segmented air electric regulating valve 2 10 is connected to the air inlet 1 of the burner 5 of the lower heat-averaging section through a pipeline; the output end of the total air electric regulating valve 7 is connected to the burner 1 of the lower heat-averaging section through the central air gate valve 6. The air inlet 2 of the burner 5 of the upper heating section is connected through a pipeline; wherein, the upper heating section gas pipeline is connected with the III# segmented gas pneumatic regulating valve 2, the III# segmented gas butterfly valve 3, and the III# segmented gas electric regulating valve 4 in sequence, and the output end of the III# segmented gas electric regulating valve 4 is connected to the gas inlet of the burner 5 of the upper heating section through a pipeline, and the upper heating section combustion-supporting pipeline is connected with the III# segmented air electric regulating valve 1 8, the III# segmented air gate valve 9, and the III# segmented air electric regulating valve 2 10 in sequence, and the output end of the III# segmented air electric regulating valve 2 10 is connected to the air inlet 1 of the burner 5 of the upper heating section through a pipeline; the output end of the total air electric regulating valve 7 is connected to the air inlet 2 of the burner 5 of the upper heating section through a pipeline via the central air gate valve 6;Among them, the upper heat-saturating section gas pipeline is connected with IV# segmented gas pneumatic regulating valve 2, IV# segmented gas butterfly valve 3, and IV# segmented gas electric regulating valve 4 in sequence, and the output end of IV# segmented gas electric regulating valve 4 is connected to the gas inlet of the burner 5 of the upper heat-saturating section through a pipeline, and the upper heat-saturating section combustion-supporting pipeline is connected with IV# segmented air electric regulating valve 1 8, IV# segmented air gate valve 9, and IV# segmented air electric regulating valve 2 10 in sequence, and the output end of IV# segmented air electric regulating valve 2 10 is connected to the air inlet 1 of the burner 5 of the upper heat-saturating section through a pipeline; the output end of the total air electric regulating valve 7 is connected to the air inlet 2 of the burner 5 of the upper heat-saturating section through a pipeline via the central air gate valve 6. ;

[0024] The main circuits of the lower heating section gas pipeline, the lower soaking section gas pipeline, the upper heating section gas pipeline and the upper soaking section gas pipeline all include main circuit one, main circuit two and main circuit three. The input ends of main circuit one, main circuit two and main circuit three are all connected to the three-phase AC power supply AC380V. The main circuit one includes an overheating relay KH1, a forward contactor KM1 and a circuit breaker QF1 which are sequentially connected to the motor of the segmented gas butterfly valve 3. The main circuit one also includes a reverse contactor KM2. The main contact of the forward contactor KM1 is connected between the three-phase AC power supply AC380V and the motor of the segmented gas butterfly valve 3 to form a forward connection mode. The main contact of the reverse contactor KM2 is connected between the three-phase AC power supply AC380V and the motor of the segmented gas butterfly valve 3 to form a reverse connection mode. The main circuit two includes an overheating relay KH2, a forward contactor KM3 and a circuit breaker QF2 which are sequentially connected to the motor of the segmented air gate valve 9. The main circuit one also includes a reverse contactor KM 4. The main contact of the forward contactor KM3 is connected between the three-phase AC power supply AC380V and the motor of the segmented air gate valve 9 to form a forward connection mode, and the main contact of the reverse contactor KM4 is connected between the three-phase AC power supply AC380V and the motor of the segmented air gate valve 9 to form a reverse connection mode; the main circuit three includes an overheating relay KH3, a forward contactor KM5, and a circuit breaker QF3 which are connected to the motor of the central air gate valve 6 in sequence, and the main circuit one also includes a reverse contactor KM6, the main contact of the forward contactor KM5 is connected between the three-phase AC power supply AC380V and the motor of the central air gate valve 6 to form a forward connection mode, and the main contact of the reverse contactor KM6 is connected between the three-phase AC power supply AC380V and the motor of the central air gate valve 6 to form a reverse connection mode; the gas butterfly valve motor, the segmented air gate valve 9 motor, and the central air gate valve 6 motor are used to drive the switching actions of the segmented gas butterfly valve 3, the segmented air gate valve 9, and the central air gate valve 6 respectively.

[0025] The control units of the lower heating section gas pipeline, the lower soaking section gas pipeline, the upper heating section gas pipeline, and the upper soaking section gas pipeline include a digital input module, a digital output module, an analog input module, an analog output module, a communication module, and a power module. The digital input module, the digital output module, the analog input module, the analog output module, the communication module, and the power module are connected through ports. The input end of the power module is connected to the AC power supply AC220V. The power module is used to provide working power. The normally open auxiliary contacts of the forward contactors KM1, KM3, and KM5, the normally open auxiliary contacts of the reverse contactors KM2, KM4, and KM6, the normally open auxiliary contacts of the overheating relays KH1, KH2, and KH3, and the normally open auxiliary contacts of the circuit breakers QF1, QF2, and QF3 are respectively connected to the digital input module through ports, the digital output module is connected to the coils of the relays K1 to K6 through ports, and the normally open contacts of the relays K1 to K6 are respectively connected to the digital input module through ports. The analog output modules are connected to the input terminals of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the total gas regulating valve, the total air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2 respectively. The PLC master station gives opening instructions to the segmented gas regulating valve 2, the segmented gas regulating valve 1, the total gas regulating valve, the total air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2 through the HMI human-machine interaction screen to adjust the opening of the regulating valve. The analog input modules are connected to the output terminals of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the total gas regulating valve, the total air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2 respectively, and are used to display the opening of the regulating valve in real time on the HMI human-machine interaction screen; the communication modules of the control units of the lower heating section gas pipeline, the lower soaking section gas pipeline, the upper heating section gas pipeline, and the upper soaking section gas pipeline are used to connect to the PLC master station; the control unit is a PLC.

[0026] Working principle:

[0027] The combustion system of the heating furnace is mainly composed of the burner, the air supply system of the combustion-supporting fan, the fuel supply system of the mixed gas, and the smoke exhaust system. The mixed gas is high-pressure and coke oven gas, and the calorific value is not less than 2000kcal / Nm3 according to the volume ratio. The high-pressure coke mixed gas is mixed by the gas system and then transported to the heating furnace users through the mixed gas main pipeline. Electric regulating valves, blind plate eye valves and quick-cut regulating valves entering the steel rolling heating furnace users are installed on the main pipeline. The quick-cut regulating valve is a pneumatically controlled regulating valve, which adopts the total gas pneumatic quick-cut regulating valve. It is used to adjust the fuel flow size during normal production and is used for quick gas cut-off in the accident state; after entering from the main pipeline, the fuel enters the pneumatic regulating valve for flow control regulation in each section. After entering the section pneumatic regulating valve, the fuel enters the gas butterfly valve and electric regulating valve in front of the burner, and the valve opening is controlled according to the amount of fuel required. Air enters from all sides of the burner, and gas enters from the middle of the burner. In order to protect the metal parts of the burner from damage, a central wind is supplied at the center of the burner; the air and mixed gas are preheated by the preheater to 500℃ and 300℃ respectively. The air and gas valves of each section and the air gate valve (or gas butterfly valve) and electric regulating valve in front of the burner are all valves resistant to high temperature and corrosion. The fuel mixed gas enters from the main pipeline, and is divided into up, down, left and right segmented control after entering the main pipeline, and then enters the valve in front of the burner in segments to control the flow size. The combustion air is also controlled in segments after entering the main pipeline to the control in front of the burner. The structure of the burner is suitable for segmented combustion. The air enters through the outside of the burner, and the mixed gas enters through the inside. The central wind passes through the inside of the metal parts. The air and mixed gas entering the burner are ejected from their respective nozzles and mixed and burned in the furnace. The heat generated by the combustion is used to heat the continuous casting slab in the heating furnace, providing qualified continuous casting slabs that meet the rolling temperature for the next rolling process.

[0028] The utility model PLC master station gives opening instructions to the segmented gas regulating valve 2, the segmented gas regulating valve 1, the total gas regulating valve, the total air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2 through the HMI human-machine interaction screen, so as to adjust the opening of the regulating valve, and there is no need to manually adjust the opening of the manual valve on site, which saves time and effort; the analog input module is respectively connected to the output ends of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the total gas regulating valve, the total air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2, and the operating personnel can check the opening of the regulating valve on the HMI human-machine interaction screen at any time, and the operation is intuitive, convenient and fast; the digital output module is connected to the relay group, and is connected to the coil of the contactor through the normally open contact of the relay group, so as to prevent the contactor from short-circuiting and burning the digital output module, and the structure is simple and easy to promote; the total gas pneumatic quick-cut regulating valve is adopted, which is used to adjust the fuel flow size during normal production and is used for quick gas cut-off under accident conditions.

Claims

1. A heating furnace burner control device, characterized in that: It includes a burner, a segmented gas regulating valve 2, a segmented gas butterfly valve, a segmented gas regulating valve 1, a total gas regulating valve, a total air regulating valve, a segmented air regulating valve 1, a segmented air gate valve, a segmented air regulating valve 2, a central air gate valve, a main circuit, and a control unit. The input end of the total gas regulating valve is connected to the mixed gas pipeline, and the output end of the total gas regulating valve is connected to several segmented gas pipelines. Each segmented gas pipeline is connected in sequence with the segmented gas regulating valve 1, the segmented gas butterfly valve, the segmented gas regulating valve 2, and the segmented gas regulating valve 2. The output end of the main air regulating valve is connected to the gas inlet of the burner of the corresponding section through a pipeline; the input end of the main air regulating valve is connected to the combustion-supporting air pipeline, and the output end of the main air regulating valve is connected to a number of segmented combustion-supporting pipelines, each of which is sequentially connected with a segmented air regulating valve 1, a segmented air gate valve, and a segmented air regulating valve 2, and the output end of the segmented air regulating valve 2 is connected to the air inlet 1 of the burner of the corresponding section through a pipeline; the output end of the main air regulating valve is connected to the air inlet 2 of the burner of the corresponding section through a pipeline via the central air gate valve; The sectional gas butterfly valve, sectional air gate valve and central air gate valve are connected to the main circuit of the corresponding section; the sectional gas regulating valve 2, sectional gas butterfly valve, sectional gas regulating valve 1, total gas regulating valve, total air regulating valve, sectional air regulating valve 1, sectional air gate valve, sectional air regulating valve 2 and central air gate valve are connected to the control unit of the corresponding section; the main circuit of the corresponding section and the control unit of the corresponding section are connected.

2. A heating furnace burner control device according to claim 1, characterized in that: The main gas regulating valve is a pneumatic regulating valve, the segmented gas regulating valve 1 is a pneumatic regulating valve, the segmented gas regulating valve 2 is an electric regulating valve, the main air regulating valve is an electric regulating valve, and the segmented air regulating valve 1 and the segmented air regulating valve 2 are both electric regulating valves.

3. A heating furnace burner control device according to claim 1, characterized in that: The main circuit includes main circuit one, main circuit two and main circuit three. The input ends of main circuit one, main circuit two and main circuit three are all connected to the three-phase AC power supply. Main circuit one, main circuit two and main circuit three all include an overheating relay, a forward contactor and a circuit breaker connected to the valve motor in sequence. Main circuit one, main circuit two and main circuit three also include a reverse contactor. The main contacts of the forward contactor are connected between the three-phase AC power supply and the valve motor to form a forward connection mode. The main contacts of the reverse contactor are connected between the three-phase AC power supply and the valve motor to form a reverse connection mode. Main circuit one, main circuit two and main circuit three are all connected to the control unit. The valve motor includes a segmented gas butterfly valve motor, a segmented air gate valve motor and a central air gate valve motor, which are respectively used to drive the switching actions of the segmented gas butterfly valve, the segmented air gate valve and the central air gate valve.

4. A heating furnace burner control device according to claim 3, characterized in that: The control unit includes a digital input module, a digital output module, an analog input module, an analog output module, a communication module, and a power module. The digital input module, the digital output module, the analog input module, the analog output module, the communication module, and the power module are connected through ports. The power module is used to provide working power. The normally open auxiliary contacts of the forward contactor, the normally open auxiliary contacts of the reverse contactor, the normally open auxiliary contacts of the overheating relay, and the normally open auxiliary contacts of the circuit breaker are respectively connected to the digital input module through ports. The digital output module is connected to the relay The coils of the group are connected through ports, and the normally open contacts of the relay group are respectively connected to the coils of the forward contactor and the reverse contactor; the analog output module is respectively connected to the input ends of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the main gas regulating valve, the main air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2, and the analog input module is respectively connected to the output ends of the segmented gas regulating valve 2, the segmented gas regulating valve 1, the main gas regulating valve, the main air regulating valve, the segmented air regulating valve 1, and the segmented air regulating valve 2; the communication module is used to connect to the PLC master station.

5. A heating furnace burner control device according to claim 4, characterized in that: The relay group includes a plurality of relays.

6. A heating furnace burner control device according to claim 4, characterized in that: The control unit is a PLC.

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