Blast furnace gas direct supply coke oven pressure adjusting device

Abstract

The utility model discloses a blast furnace gas direct supply coke oven pressure regulating device, which belongs to the technical field of blast furnace gas pressure regulation, is mounted on a first pipeline communicated with a blast furnace and a coke oven, and comprises a gas holder, a bypass valve, a pressure regulating valve and a pressure regulating valve, two ends of the gas holder are respectively connected with the first pipeline through a second pipeline; a gas holder regulating valve is arranged on the first pipeline at the downstream of the gas holder; the coking regulating valve is positioned on the first pipeline between the gas holder regulating valve and the coke oven and is used for controlling the pressure of coal gas conveyed to the coke oven; the diffusing pipe is located between the gas holder adjusting valve and the coking adjusting valve and communicated with the first pipeline, and a diffusing valve is arranged on the diffusing pipe and used for diffusing coal gas when the pipeline is overpressure. According to the application, three-stage series adjustment and two-stage parallel emergency diffusion modes are adopted, so that the stability of blast furnace gas pressure, three-stage series adjustment parameter preposition, advanced intervention and fluctuation reduction are realized, and the requirement of a coke oven on blast furnace gas fluctuation is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of coke oven pressure regulation and relates to a blast furnace gas direct supply coke oven pressure regulating device. Background Art

[0002] A steel plant currently has a (1780m 3 ) Blast furnace, 200,000 m 3 There is one blast furnace gas tank, which delivers blast furnace gas to users throughout the plant through the pipeline network and mixing station. A vent pipe is installed, and a DN250 vent pressure regulating valve (pressure ≤ 16kPa) is installed on the vent pipe. Two ramming coke ovens are equipped with high-coke coking and heating functions. Blast furnace gas passes through 200,000m 3 After the gas tank (pressure 12kPa), it is regulated by a DN1400 regulating valve and supplied to two coke ovens, with a mixed blast furnace gas consumption of 110,000 m 3 / h, because it passes through 200,000 m 3 The gas cabinet supplies gas at a stable pressure, and the pressure of the coke oven mixed with blast furnace gas is stable.

[0003] Under normal circumstances, the coke oven requires the fluctuation of blast furnace gas to be within 2KPa. However, in actual use, the existing blast furnace gas direct supply coke oven system has large blast furnace gas pipeline pressure fluctuations, with pressure fluctuations exceeding 14KPa, and the stability of the pressure delivered to the coke oven cannot be guaranteed.

[0004] Therefore, it is necessary to provide a blast furnace gas direct supply coke oven pressure regulating device which can control the blast furnace gas output pressure. Utility Model Content

[0005] In order to at least solve the problem in the prior art that the pressure fluctuation of the blast furnace gas pipeline network is large and does not meet the fluctuation requirements of the coke oven for the blast furnace gas, the utility model provides the following technical solutions: a blast furnace gas direct supply coke oven pressure regulating device, installed on the first pipeline connecting the blast furnace and the coke oven, the pressure regulating device comprises:

[0006] A gas cabinet, wherein the gas cabinet is arranged in parallel with a bypass valve located on the first pipeline, two ends of the gas cabinet are respectively connected to the first pipeline through a second pipeline, and a gas cabinet regulating valve is arranged on the first pipeline downstream of the gas cabinet;

[0007] a coking regulating valve, the coking regulating valve being located on the first pipeline between the gas holder regulating valve and the coke oven and being used for controlling the gas pressure supplied to the coke oven; and

[0008] A relief pipe is located between the gas holder regulating valve and the coking regulating valve and is connected to the first pipeline. A relief valve is provided on the relief pipe for releasing coal gas when the pipeline is over-pressured.

[0009] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the pressure regulating device further comprises: an ignition device;

[0010] The ignition device is located on the relief pipe downstream of the relief valve, and is used for ignition when the relief valve releases coal gas.

[0011] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the pressure regulating device further comprises: a gas flow meter;

[0012] The gas flow meter is located on the relief pipe upstream of the relief valve, and is used to measure the gas flow passing through the relief valve.

[0013] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the distance from the coking regulating valve and / or the bleed valve to the intersection of the bleed pipe and the first pipeline is greater than 200 meters.

[0014] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, a first atomizer is installed on the second pipeline upstream of the gas cabinet.

[0015] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, a second atomizer is installed on the first pipeline between the gas holder regulating valve and the vent pipe.

[0016] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the number of the coke ovens is two and they are arranged in parallel.

[0017] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the relief valve and the coking regulating valve are both pneumatic regulating valves;

[0018] The gas cabinet regulating valve is an electric regulating valve.

[0019] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the bypass valve, the gas holder regulating valve, the coking regulating valve, the relief valve and the gas holder are all connected to the remote PLC signal.

[0020] Optionally, in the above-mentioned blast furnace gas direct supply coke oven pressure regulating device, the output pressure of the coking regulating valve does not exceed 2 kPa.

[0021] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0022] This application adopts three-stage (bypass valve, gas holder regulating valve, coking regulating valve) series regulation and two-stage (gas holder and bypass valve, vent valve and coking regulating valve) parallel emergency release to achieve the stability of blast furnace gas pressure. The three-stage series regulation parameters are pre-set to intervene in advance and reduce fluctuations, thereby meeting the coke oven's requirements for blast furnace gas fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the position structure of a blast furnace gas direct supply coke oven pressure regulating device provided by an embodiment of the utility model;

[0024] In the figure: 1. first pipeline; 2. gas holder; 3. gas holder regulating valve; 4. coking regulating valve; 5. vent valve; 6. bypass valve; 7. gas flow meter; 8. ignition device; 9. vent pipe; 10. first atomizer; 11. second atomizer; 12. second pipeline; 13. outlet butterfly valve; 14. inlet butterfly valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figure 1 The utility model provides the following technical solution: a blast furnace gas direct supply coke oven pressure regulating device, installed on the first pipeline 1 connecting the blast furnace (not shown) and the coke oven. The pressure regulating device includes: a gas cabinet 2, a bypass valve 6, a gas cabinet regulating valve 3, a coking regulating valve 4, a vent pipe 9 and a vent valve 5.

[0028] The gas cabinet 2 is arranged in parallel with the bypass valve 6 (referring to the gas cabinet blast furnace gas bypass valve 6) located on the first pipeline 1 (also called the blast furnace gas pipeline), and at the same time, both ends of the gas cabinet 2 are connected to the first pipeline 1 through the second pipeline 12, so that when the bypass valve 6 is closed, the blast furnace gas enters the gas cabinet 2 through the second pipeline 12 for storage, and when the bypass valve 6 is opened, the blast furnace gas flows to the coke oven along the first pipeline 1. Preferably, an inlet butterfly valve 14 is arranged on the second pipeline 12 on one side of the gas cabinet 2, an outlet butterfly valve 13 is arranged on the second pipeline 12 on the other side of the gas cabinet 2, and an inlet butterfly valve 14 is arranged on the first pipeline 1 near the inlet of the bypass valve 6. These three butterfly valves mainly play the role of cutting off and throttling on the pipeline. A gas cabinet regulating valve 3 (model DN1400) is arranged on the first pipeline 1 downstream of the gas cabinet 2 to control the gas pressure output by the gas cabinet 2. The coking regulating valve 4 (model DN1400) is located on the first pipeline 1 between the gas tank regulating valve 3 and the coke oven, and is used to control the gas pressure supplied to the coke oven. It is understandable that the coking regulating valve 4 and the gas tank regulating valve 3 are adjusted in sections. The vent pipe 9 is located between the gas tank regulating valve 3 and the coking regulating valve 4, and the vent pipe 9 is connected to the first pipeline 1. The vent pipe 9 is provided with a vent valve 5 (model DN350). It is understandable that the vent valve 5 is arranged in parallel with the coking regulating valve 4 as an emergency venting device. The vent valve 5 is used to vent the gas when the pipeline is over-pressured. Preferably, the vent valve 5 and the coking regulating valve 4 are both pneumatic regulating valves (characteristics: fast response), and the gas tank regulating valve 3 is an electric regulating valve (characteristics: high precision). The present application adopts a three-stage (bypass valve 6, gas holder regulating valve 3, coking regulating valve 4) series regulation and a two-stage (gas holder 2 and bypass valve 6, relief valve 5 and coking regulating valve 4) parallel emergency relief mode, that is, the first-stage gas output by the blast furnace enters the gas holder regulating valve 3 after the second-stage gas is limited by the bypass valve 6 to reduce pressure, and the third-stage gas after reduction pressure enters the coking regulating valve 4 to further reduce pressure before being input into the coke oven. At the same time, the gas holder 2 arranged in parallel with the bypass valve 6 stores or releases gas in a timely manner when the demand and supply of blast furnace gas are unbalanced, and the relief valve 5 arranged in parallel with the coking regulating valve 4 releases gas (i.e., reduces pressure) when the pipeline is over-pressured, thereby achieving the stability of blast furnace gas pressure. The three-stage series regulation parameters are pre-set to intervene in advance and reduce fluctuations, so that the output pressure of the coking regulating valve 4 does not exceed 2kP, meeting the fluctuation requirements of the coke oven for blast furnace gas. It should be noted that this device must be debugged before use. After debugging is completed, the gas cabinet outlet butterfly valve is opened, the bypass valve is closed, and the gas cabinet is used as the gas source to supply gas at a stable pressure.

[0029] In order to prevent the released gas from gathering, the pressure regulating device further includes: an ignition device 8. The ignition device 8 is located on the release pipe 9 downstream of the release valve 5. When the amount of gas released by the release valve 5 is large, the ignition device 8 is started to ignite and burn the gas, thereby preventing the accumulation of gas from causing serious harm to equipment and personnel. The ignition device 8 can be an ignition device 8 in the prior art, and the specific structure of the ignition device is not limited in this embodiment.

[0030] The pressure regulating device further comprises: a gas flow meter 7. The gas flow meter 7 is located on the relief pipe 9 upstream of the relief valve 5, and is used to measure the gas flow passing through the relief valve 5, and can also monitor the gas pressure in the pipeline.

[0031] The distance from the coking regulating valve 4 and / or the relief valve 5 to the intersection of the relief pipe 9 and the first pipeline 1 is greater than 200 meters, so that the distance between the two regulating valves can be ensured to be greater than 200 meters, thereby increasing the buffering capacity of the coal gas in the pipeline.

[0032] A first atomizer 10 (i.e., an atomization system) is installed on the second pipeline 12 upstream of the gas cabinet 2. Furthermore, a second atomizer 11 (i.e., an atomization system) is installed on the first pipeline 1 between the gas cabinet regulating valve 3 and the vent pipe 9. According to actual needs on site, the first atomizer 10 and / or the second atomizer 11 is started to ensure that the gas temperature directly supplied to the coke oven drops below 50°C, and to reduce the dust in the gas, thereby reducing the impact on new energy. The atomizer can be an atomizer in the prior art, and this embodiment does not limit the specific structure of the atomizer. Preferably, an inlet butterfly valve 14 is provided on the second pipeline 12 at the inlet of the first atomizer 10, and the butterfly valve mainly plays a role of cutting off and throttling on the pipeline.

[0033] In this embodiment, there are two coke ovens, and the two coke ovens are arranged in parallel. It can be understood that the coal gas in the blast furnace (or another gas source gas cabinet 2) can flow to the two coke ovens respectively along different branches.

[0034] The bypass valve 6, gas tank regulating valve 3, coking regulating valve 4, relief valve 5 and gas tank 2 are all connected to the remote PLC signal. Under different working conditions, the PLC remotely debugs the parameters of the relevant valves through analog signals.

[0035] In order to better monitor the pressure of the coal gas in the first pipeline 1, a first pressure gauge P1 and a second pressure gauge P2 are respectively provided on the first pipeline 1 upstream and downstream of the gas holder 2, and a third pressure gauge P3 is provided on the first pipeline between the vent pipe 9 and the coking regulating valve 4. Preferably, a first thermometer T1 is provided on the first pipeline 1 between the first pressure gauge P1 and the second pipeline 12, and a second thermometer T2 is provided on the first pipeline 1 between the second pressure gauge P2 and the gas holder regulating valve 3, and both thermometers are used to monitor the temperature of the coal gas in the pipeline.

[0036] The debugging and use methods of this pressure regulating device are as follows:

[0037] Under the current production operation mode, first adjust the DN350 relief valve 5 (pressure ≤ 16kPa) according to the planned set pressure and put it into automatic regulation. The blast furnace gas relief pressure needs to reach the predetermined fluctuation range (when the piston of gas tank 2 is in the high position and the inlet butterfly valve 14 is closed);

[0038] Then, when the coke oven heating adopts the one-coke-one-high production mode, set the pressure adjustment range of DN1400 gas tank regulating valve 3, DN1400 coking regulating valve 4 and DN350 relief valve 5 according to the planned pressure value, change the DN1400 gas tank regulating valve 3 to manual adjustment, appropriately increase the valve back pressure to 6kPa, and then put the DN1400 coking regulating valve 4 and DN350 relief valve 5 into automatic adjustment. After the adjustment is stable, slowly and gradually increase the valve back pressure of DN1400 gas tank regulating valve 3 until it reaches the planned set pressure (9.0~10.0)kPa, and after the DN1400 coking regulating valve 4 works normally and can meet the coke oven heating process requirements (the blast furnace gas dedicated pipe pressure is controlled between 4.0~6.0kPa), put the DN1400 gas tank regulating valve 3 into automatic adjustment;

[0039] (If the coke oven adopts the full coke gas heating production mode, it can be debugged by inputting analog signals according to the actual working conditions, and after confirming that the DN1400 coking regulating valve 4 and the DN350 relief valve 5 are working normally, it can be put into formal operation)

[0040] After all the above operations are completed and the operation is normal and stable, open the bypass valve 6 (gas tank blast furnace gas) to 45%. The current setting value of the DN1400 gas tank regulating valve 3 is: when heating the blast furnace gas of one coke oven: the valve position opening of the gas tank regulating valve 3 is 25%-38%, and the fluctuation range is (3.0~4.8) kPa. When heating the blast furnace gas of two coke ovens: the valve position opening of the gas tank regulating valve 3 is 36%-48%, and the fluctuation range is (3.0~5.2) kPa. Alarm: low report (2.0~2.5) kPa, high report (7.0~7.5) kPa. After the gas supply pressure stabilizes, slowly close the gas tank 2 outlet butterfly valve 13. During this process, pay close attention to the pressure changes, and adjust the bypass valve 6 opening in time according to the pressure changes after the bypass valve 6 until the coke oven blast furnace gas pressure requirements are met;

[0041] After all the debugging and trial runs are completed, the butterfly valve 13 at the outlet of gas holder 2 is opened, the (gas holder blast furnace gas) bypass valve 6 is closed, and the DN1400 gas holder regulating valve 3, DN1400 coking regulating valve 4 and DN350 relief valve 5 are put into operation according to the adjusted pressure setting value. However, the adjustment setting of DN1400 coking regulating valve 4 needs to be in accordance with the original setting mode of DN1400 gas holder regulating valve 3, divided into two operating modes: one coke oven blast furnace gas heating and full blast furnace gas heating, to set the pressure adjustment range and valve position opening range, as well as the pressure alarm value. The two adjustment modes and manual and automatic adjustments can be converted to each other, which is beneficial to the stability of pressure during the mutual conversion of high and coke gases.

[0042] When the blast furnace gas is abundant and the emission volume is stable at 80000m 3 / h or above, the gas tank 2 can be tested in the maintenance shutdown state, and the inlet butterfly valve 14 of the gas tank 2 can be slowly closed, but the changes in the blast furnace gas pressure must be closely monitored, and the opening of the bypass valve 6 must be adjusted in time to stabilize the pressure before the DN1400 gas tank regulating valve 3 as much as possible to avoid drastic fluctuations in the pressure after the valve, which may affect the safe production of the coke oven.

[0043] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A blast furnace gas direct supply coke oven pressure regulating device, installed on the first pipeline connecting the blast furnace and the coke oven, characterized in that: The pressure regulating device comprises: A gas cabinet, wherein the gas cabinet is arranged in parallel with a bypass valve located on the first pipeline, two ends of the gas cabinet are respectively connected to the first pipeline through a second pipeline, and a gas cabinet regulating valve is arranged on the first pipeline downstream of the gas cabinet; a coking regulating valve, the coking regulating valve being located on the first pipeline between the gas holder regulating valve and the coke oven and being used for controlling the gas pressure supplied to the coke oven; and A relief pipe is located between the gas holder regulating valve and the coking regulating valve and is connected to the first pipeline. A relief valve is provided on the relief pipe for releasing coal gas when the pipeline is over-pressured.

2. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The pressure regulating device further comprises: an ignition device; The ignition device is located on the relief pipe downstream of the relief valve, and is used for ignition when the relief valve releases coal gas.

3. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The pressure regulating device further comprises: a gas flow meter; The gas flow meter is located on the relief pipe upstream of the relief valve, and is used to measure the gas flow passing through the relief valve.

4. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The distance between the coking regulating valve and / or the relief valve and the intersection of the relief pipe and the first pipeline is greater than 200 meters.

5. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: A first atomizer is installed on the second pipeline upstream of the gas cabinet.

6. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: A second atomizer is installed on the first pipeline between the gas cabinet regulating valve and the vent pipe.

7. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: There are two coke ovens, which are arranged in parallel.

8. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The relief valve and the coking regulating valve are both pneumatic regulating valves; The gas cabinet regulating valve is an electric regulating valve.

9. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The bypass valve, the gas holder regulating valve, the coking regulating valve, the relief valve and the gas holder are all connected to the remote PLC signal.

10. The blast furnace gas direct supply coke oven pressure regulating device according to claim 1, characterized in that: The output pressure of the coking regulating valve does not exceed 2 kPa.

Images