Blast furnace gas emission control system

Abstract

The utility model relates to a blast furnace gas diffusion control system, and belongs to the technical field of gas equipment. According to the technical scheme, the top of a blast furnace (1) is connected with an inlet of an energy recovery coaxial unit BPRT (2) through a pipeline, a BPRT outlet valve set (3) is arranged at the rear end of the energy recovery coaxial unit BPRT (2) and connected with a gas pipe network (7), a three-pipe diffusion tower (4), a gas holder (5) and a gas user (8) are arranged on the gas pipe network (7), and a pressure transmitter (9) is arranged at the tail end of the gas pipe network (7). The utility model has the beneficial effects that the operation amount and the operation error of workers are reduced, and the stable state of the gas chamber piston and the stable pressure at the tail end of a gas pipe network are realized; meanwhile, the diffusion rate of coal gas can be greatly reduced, coal gas is saved, and benefits are created for companies.

Description

TECHNICAL FIELD

[0001] The utility model relates to a blast furnace gas diffusion control system and belongs to the technical field of gas equipment. BACKGROUND

[0002] In the industrial production process of metallurgy, equipment manufacturing and the like, blast furnace process production is the most important link of the metallurgical (iron and steel) industry. Blast furnace smelting is a continuous production process of reducing iron ore into pig iron. The iron element in the ore is extracted, and the main product produced is molten iron. By-products include water slag, slag wool and blast furnace gas and the like.

[0003] Among them, the main components of blast furnace gas include carbon monoxide, carbon dioxide, nitrogen, hydrogen and methane and the like. It can be used as a low-calorific-value gas fuel in hot blast furnaces, coke ovens, sintering, pelletizing, lime kilns, steel rolling heating furnaces, slag powder, boiler heating and the like in metallurgical enterprises.

[0004] The commonly used blast furnace gas diffusion tower is a three-pipe diffusion tower, and the chimney of the three-pipe diffusion tower is composed of three obliquely vertically arranged circular pipe chimneys. An adjusting butterfly valve, a cut-off butterfly valve and a blind plate valve are provided in series in each diffusion pipe. When the blast furnace produces more gas than the consumption of other furnace gas in the metallurgical enterprise, the blast furnace gas is burned and consumed through the gas diffusion tower. However, since the gas balance in the metallurgical enterprise is a dynamic balance, the blast furnace gas production and the gas consumption of each gas user are not constant. Although a gas tank and other buffer devices are provided in the gas pipe network to adjust the gas balance, the ideal effect cannot be achieved. The operators of the three-pipe diffusion tower adjust the adjusting butterfly valve, the cut-off butterfly valve and the blind plate valve of the diffusion pipe according to the tank capacity of the gas tank and the pressure at the end of the gas pipe network. If the operators do not operate in time, it will cause waste of gas, fluctuation of gas pressure and other consequences, and in severe cases, it may cause the gas tank to overflow or the gas tank to be on the ground (fall to the bottom), causing major equipment and safety accidents. The piston of the gas tank is always moving up and down due to the untimely operation of the valve of the diffusion tower. The rapid up-and-down movement of the piston will cause damage to the tank wall of the gas tank. Long-term piston movement will cause the tank wall of the gas tank to leak gas or seal oil, causing equipment failure and safety hazards, and adversely affecting the stable development of the metallurgical enterprise. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a blast furnace gas diffusion control system, reducing the operation amount and operation error of workers, realizing the stable state of the piston of the gas tank and the stable pressure at the end of the gas pipe network. At the same time, due to the continuity of the PID control, the diffusion rate of the gas can be greatly reduced, thereby realizing the concept of "using as much as possible and collecting as much as possible", and further realizing the saving of gas, creating benefits for the company and solving the above problems existing in the background technology.

[0006] The utility model discloses a technical scheme is: a blast furnace coal gas diffusion control system contains blast furnace, energy recovery coaxial unit BPRT, BPRT export valve group, three -tube diffusion tower, gas holder, gas pipe network, gas user and PLC, the top of blast furnace is connected with energy recovery coaxial unit BPRT inlet through the pipeline, and the rear end of energy recovery coaxial unit BPRT is connected with gas pipe network with BPRT export valve group, and three -tube diffusion tower, gas holder and gas user are respectively equipped on gas pipe network, and the terminal of gas pipe network is equipped with pressure transmitter, and PLC contains PLC input module and PLC output module, and PLC input module is connected with pressure transmitter and gas holder respectively through signal cable, and PLC output module is connected with three -tube diffusion tower, gas holder and BPRT export valve group respectively through control cable.

[0007] The gas holder is a dry gas holder, a piston is arranged in the gas holder, and the lower part of the piston stores blast furnace gas; a laser cabinet position instrument is further arranged in the gas holder, and the emitter and the receiving stage of the laser cabinet position instrument are vertically arranged on the top of the piston and the inner side of the top of the gas holder respectively; a gas holder diffusion pipe is arranged on the outer side of the top of the gas holder, and a gas holder inlet and outlet valve group is arranged at the inlet and outlet of the gas holder, and the other side of the gas holder inlet and outlet valve group is connected with the gas pipe network.

[0008] In the connection between the PLC and the gas holder, the PLC input module is connected with the laser cabinet position instrument through a signal cable, and the PLC output module is connected with the gas holder diffusion pipe and the gas holder inlet and outlet valve group respectively.

[0009] The three-tube diffusion tower comprises a diffusion A pipe, a diffusion B pipe and a diffusion C pipe, and the gas inlet side of the three-tube diffusion tower is connected with the gas pipe network; a diffusion A pipe regulating valve, a diffusion A pipe cut-off valve and a diffusion A pipe blind valve are connected in series on the diffusion A pipe; a diffusion B pipe regulating valve, a diffusion B pipe cut-off valve and a diffusion B pipe blind valve are connected in series on the diffusion B pipe; a diffusion C pipe regulating valve, a diffusion C pipe cut-off valve and a diffusion C pipe blind valve are connected in series on the diffusion C pipe.

[0010] In the connection between the PLC and the three-tube diffusion tower, the PLC output module is connected with the diffusion A pipe regulating valve, the diffusion A pipe cut-off valve, the diffusion A pipe blind valve, the diffusion B pipe regulating valve, the diffusion B pipe cut-off valve, the diffusion B pipe blind valve, the diffusion C pipe regulating valve, the diffusion C pipe cut-off valve and the diffusion C pipe blind valve through control cables respectively.

[0011] The diffusion A pipe, the diffusion B pipe and the diffusion C pipe are three inclined vertical circular pipe chimneys.

[0012] The number of the gas users is more than one.

[0013] The utility model discloses a beneficial effect is: reduce the operation amount and operation error of worker, realize the stable state of coal gas tank piston and the stable pressure of coal gas pipe network end, simultaneously owing to the continuity of PID control, can greatly reduce the diffusion rate of coal gas, thereby realize the concept of " can use, can collect the concept of " and realize the saving of coal gas, create the benefit for company. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the whole structure schematic diagram of the utility model;

[0015] In the drawing: blast furnace 1, energy recovery coaxial unit BPRT 2, BPRT export valve group 3, three pipe diffusion tower 4, diffusion A pipe regulating valve 4-1, diffusion A pipe cut-off valve 4-2, diffusion A pipe blind plate valve 4-3, diffusion B pipe regulating valve 4-4, diffusion B pipe cut-off valve 4-5, diffusion B pipe blind plate valve 4-6, diffusion C pipe regulating valve 4-7, diffusion C pipe cut-off valve 4-8, diffusion C pipe blind plate valve 4-9, coal gas tank 5, coal gas tank diffusion pipe 5-1, laser tank position instrument 5-2, coal gas tank entrance and exit valve group 6, coal gas pipe network 7, coal gas user 8, pressure transmitter 9, PLC 10. DETAILED DESCRIPTION

[0016] In order to make the utility model implementation case's purpose, technical scheme and advantage more clearly, the following will be combined with the drawing in implementation case, to the technical scheme in the utility model implementation case clear, complete description, obviously, the implementation case expressed is the utility model one small part implementation case, is not all implementation case, based on the implementation case in the utility model, all other implementation cases that the ordinary skill in the art person obtains under the premise of not making creative labor belong to the protection scope of the utility model.

[0017] A blast furnace coal gas diffusion control system, contain blast furnace 1, energy recovery coaxial unit BPRT 2, BPRT export valve group 3, three pipe diffusion tower 4, coal gas tank 5, coal gas pipe network 7, coal gas user 8 and PLC 10, blast furnace 1 top and energy recovery coaxial unit BPRT 2 entrance are connected through pipeline, and energy recovery coaxial unit BPRT 2 rear end is provided with BPRT export valve group 3 and is connected with coal gas pipe network 7, and three pipe diffusion tower 4, coal gas tank 5 and coal gas user 8 are respectively equipped on coal gas pipe network 7, and pressure transmitter 9 is equipped at the end of coal gas pipe network 7;PLC 10 contains PLC input module and PLC output module, and PLC input module is connected with pressure transmitter 9 and coal gas tank 5 through signal cable respectively;PLC output module is connected with three pipe diffusion tower 4, coal gas tank 5 and BPRT export valve group 3 through control cable respectively.

[0018] The coal gas tank 5 is a dry coal gas tank, and a piston is arranged in the coal gas tank 5, and the lower part of the piston stores blast furnace gas; a laser tank position instrument 5-2 is further arranged in the coal gas tank 5, and the emitter and the receiving stage of the laser tank position instrument 5-2 are vertically arranged on the top of the piston and the inner side of the top of the coal gas tank 5 respectively; a coal gas tank diffusing pipe 5-1 is arranged on the outer side of the top of the coal gas tank 5, and a coal gas tank inlet and outlet valve group 6 is arranged at the inlet and outlet of the coal gas tank 5, and the other side of the coal gas tank inlet and outlet valve group 6 is connected with a coal gas pipe network 7;

[0019] In the connection between the PLC 10 and the coal gas tank 5, the PLC input module is connected with the laser tank position instrument 5-2 through a signal cable, and the PLC output module is connected with the coal gas tank diffusing pipe 5-1 and the coal gas tank inlet and outlet valve group 6 respectively.

[0020] The three-pipe diffusing tower 4 comprises a diffusing A pipe, a diffusing B pipe and a diffusing C pipe, and the three-pipe diffusing tower 4 is connected with the coal gas pipe network 7 at the gas inlet side; the diffusing A pipe is serially connected with a diffusing A pipe regulating valve 4-1, a diffusing A pipe cut-off valve 4-2 and a diffusing A pipe blind valve 4-3; the diffusing B pipe is serially connected with a diffusing B pipe regulating valve 4-4, a diffusing B pipe cut-off valve 4-5 and a diffusing B pipe blind valve 4-6; and the diffusing C pipe is serially connected with a diffusing C pipe regulating valve 4-7, a diffusing C pipe cut-off valve 4-8 and a diffusing C pipe blind valve 4-9.

[0021] In the connection between the PLC 10 and the three-pipe diffusing tower 4, the PLC output module is connected with the diffusing A pipe regulating valve 4-1, the diffusing A pipe cut-off valve 4-2, the diffusing A pipe blind valve 4-3, the diffusing B pipe regulating valve 4-4, the diffusing B pipe cut-off valve 4-5, the diffusing B pipe blind valve 4-6, the diffusing C pipe regulating valve 4-7, the diffusing C pipe cut-off valve 4-8 and the diffusing C pipe blind valve 4-9 through control cables respectively.

[0022] The diffusing A pipe, the diffusing B pipe and the diffusing C pipe are three inclined vertically arranged circular pipe chimneys.

[0023] The number of the coal gas users 8 is more than one.

[0024] In actual application, the coal gas tank 5 can effectively alleviate the pressure fluctuation of the coal gas pipe network 7 as a buffer device of the coal gas pressure, but the buffering capacity is limited. Taking a 100,000 cubic meter coal gas tank 5 as an example, in order to prevent the coal gas tank 5 from falling to the bottom and hitting the top, the effective adjustment range of the tank capacity is 10,000 to 85,000 cubic meters, and the tank capacity of the coal gas tank 5 is controlled at 75,000 cubic meters per day, and the coal gas pressure of 10 Kpa is the best. When the blast furnace 1 fails, the coal gas in the coal gas tank 5 can be used as a buffer time for the load reduction operation or the process shutdown operation of the coal gas users 8, so as not to be forced to cut off the coal gas.

[0025] The utility model discloses a control in daily life, when the gas consumption of gas user 8 is general consumption, when the cabinet capacity of gas cabinet 5 is lower than 7.5 million cubic meters, the opening of diffusion A pipe regulating valve 4-1 and diffusion B pipe regulating valve 4-4 gradually reduces, reduces the diffusion of gas, makes the cabinet capacity of gas cabinet 5 rise to 7.5 million cubic meters, on the contrary, when the cabinet capacity of gas cabinet 5 is higher than 7.5 million cubic meters, the opening of diffusion A pipe regulating valve 4-1 and diffusion B pipe regulating valve 4-4 gradually becomes big, increases the diffusion of gas, makes the cabinet capacity of gas cabinet 5 drop to 7.5 million cubic meters. Through the uninterrupted PID regulation of PLC 10, the program in PLC 10 will automatically control the opening of diffusion A pipe regulating valve 4-1 and diffusion B pipe regulating valve 4-4, keep the cabinet capacity of gas cabinet 5 at 7.5 million cubic meters, make the pressure of gas pipe network 7 and the cabinet capacity of gas cabinet 5 stable. When the cabinet capacity of gas cabinet 5 exceeds 8.8 million cubic meters due to the fault of three pipe diffusion tower 4, laser cabinet position instrument 5-2 opens diffusion through PLC 10 interlocking gas cabinet diffusion pipe 5-1, due to no ignition system, gas cannot be combusted and consumed, long-time diffusion will lead to personnel gas poisoning and other safety hazards, so it can not be used as a common diffusion device.

[0026] When the gas consumption of gas user 8 is larger, the measured value of gas pipe network 7 end pressure transmitter 9 is lower than 10Kpa, pressure transmitter 9 gradually reduces the opening of diffusion C pipe regulating valve 4-7 through PLC 10 interlocking, at this time, the cabinet capacity of gas cabinet 5 drops synchronously and the speed is faster, the opening of diffusion A pipe regulating valve 4-1 and diffusion B pipe regulating valve 4-4 also reduces quickly according to the interlocking of the cabinet capacity of gas cabinet 5, on the one hand, restores the pressure of gas pipe network 7 to 10Kpa, on the other hand, increases the cabinet capacity of gas cabinet 5 to 7.5 million cubic meters.

[0027] When the gas production does not meet the consumption of gas user 8 due to the blast furnace 1 fault reduces the wind, the cabinet capacity of gas cabinet 5 gradually reduces, when the cabinet capacity of gas cabinet 5 is lower than 5 million cubic meters, diffusion A pipe cut-off valve 4-2, diffusion B pipe cut-off valve 4-5 and diffusion C pipe cut-off valve 4-8 all close. At this time, due to the nature of cut-off valve body and the loss of its sealing surface, it cannot be completely sealed, and a small amount of gas continues to diffuse. When the cabinet capacity of gas cabinet 5 is lower than 4 million cubic meters, diffusion A pipe blind valve 4-3, diffusion B pipe blind valve 4-6 and diffusion C pipe blind valve 4-9 all interlock and close, completely preventing the diffusion of gas. When the cabinet capacity of gas cabinet 5 is lower than 1 million cubic meters, gas cabinet inlet and outlet valve group 6 interlocks and closes, preventing the gas cabinet piston from falling to the bottom and causing a major accident. When the blast furnace 1 is in emergency blast, there is no gas production, PLC 10 synchronously interlocks and closes BPRT outlet valve group 3, preventing the gas from flowing back to the blast furnace 1 and causing a safety accident.

[0028] The utility model reduces the operation amount and operation error of worker, realizes that coal gas cabinet 5 piston keeps stable state and coal gas pipe network 7 end pressure stability, simultaneously due to the continuity of PID control, can greatly reduce the diffusion rate of coal gas, thereby realizes the concept of " can use and can collect", further realizes the saving of coal gas, creates the benefit for company. When the fault of blast furnace 1 reduces or no coal gas output occurs, PLC 10 can interlock control BPRT export valve group 3, three pipe diffusion tower 4 and other valve interlock closing, ensures to prevent the occurrence of major equipment accident and safety accident.

Claims

1. A blast furnace gas blow-off control system characterized by: The application relates to a blast furnace (1), an energy recovery coaxial machine group BPRT (2), a BPRT outlet valve group (3), a three-tube diffusion tower (4), a gas tank (5), a gas pipe network (7), a gas user (8) and a PLC (10), wherein the top of the blast furnace (1) is connected with the inlet of the energy recovery coaxial machine group BPRT (2) through a pipeline, the rear end of the energy recovery coaxial machine group BPRT (2) is provided with the BPRT outlet valve group (3) connected with the gas pipe network (7), the gas pipe network (7) is respectively provided with the three-tube diffusion tower (4), the gas tank (5) and the gas user (8), and the end of the gas pipe network (7) is provided with a pressure transmitter (9); the PLC (10) comprises a PLC input module and a PLC output module, the PLC input module is connected with the pressure transmitter (9) and the gas tank (5) through signal cables respectively; and the PLC output module is connected with the three-tube diffusion tower (4), the gas tank (5) and the BPRT outlet valve group (3) through control cables respectively.

2. A blast furnace gas blow-off control system according to claim 1, characterised in that: The gas tank (5) is a dry gas tank, a piston is arranged in the gas tank (5), and the lower part of the piston stores blast furnace gas; a laser tank position instrument (5-2) is further arranged in the gas tank (5), and the emitter and the receiving stage of the laser tank position instrument (5-2) are vertically arranged on the top of the piston and the inner side of the top of the gas tank (5) respectively; a gas tank diffusion pipe (5-1) is arranged on the outer side of the top of the gas tank (5), and a gas tank inlet and outlet valve group (6) is arranged at the inlet and outlet of the gas tank (5), and the other side of the gas tank inlet and outlet valve group (6) is connected with the gas pipe network (7); In the connection between the PLC (10) and the gas tank (5), the PLC input module is connected with the laser tank position instrument (5-2) through a signal cable, and the PLC output module is connected with the gas tank diffusion pipe (5-1) and the gas tank inlet and outlet valve group (6) respectively.

3. A blast furnace gas blow off control system as claimed in claim 1, wherein: The three-tube diffusion tower (4) comprises a diffusion A tube, a diffusion B tube and a diffusion C tube, and the three-tube diffusion tower (4) is connected with the gas pipe network (7) at the gas inlet side; a diffusion A tube regulating valve (4-1), a diffusion A tube cut-off valve (4-2) and a diffusion A tube blind valve (4-3) are arranged in series on the diffusion A tube; a diffusion B tube regulating valve (4-4), a diffusion B tube cut-off valve (4-5) and a diffusion B tube blind valve (4-6) are arranged in series on the diffusion B tube; a diffusion C tube regulating valve (4-7), a diffusion C tube cut-off valve (4-8) and a diffusion C tube blind valve (4-9) are arranged in series on the diffusion C tube; In the connection between the PLC (10) and the three-tube diffusion tower (4), the PLC output module is connected with the diffusion A tube regulating valve (4-1), the diffusion A tube cut-off valve (4-2), the diffusion A tube blind valve (4-3), the diffusion B tube regulating valve (4-4), the diffusion B tube cut-off valve (4-5), the diffusion B tube blind valve (4-6), the diffusion C tube regulating valve (4-7), the diffusion C tube cut-off valve (4-8) and the diffusion C tube blind valve (4-9) through control cables respectively.

4. A blast furnace gas blow off control system according to claim 3, characterised in that: The diffusion A tube, the diffusion B tube and the diffusion C tube are three inclined vertical circular tube chimneys.

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