A system for online expansion and upgrading of waste gas release

Abstract

The utility model discloses an online capacity expansion and upgrading system for releasing raw coal gas, including a short section with a pressure opening, a release pipe, a burner and an ignition device, a control system, a steam fire-gathering and a steam fire-extinguishing system. The short section with a pressure opening is fixedly connected to a gas collecting pipe and is provided with an opening valve. The short section with a pressure opening is connected to the release pipe through an electric flap valve. A pressure measuring point is provided on the gas collecting pipe. The control system controls the opening and closing of the opening valve and the opening and closing and the opening size of the electric flap valve. The control system is connected to the pressure measuring point to obtain the pressure value in the gas collecting pipe. The control system is connected to the ignition device to control the ignition. The control system controls the steam fire-gathering and the steam fire-extinguishing system to gather and extinguish the fire. The utility model solves the problem of insufficient release capacity in existing coke ovens. It can ensure safe release without affecting normal production, ensure that the raw coal gas can be ignited and burned in time when the coke oven is released, and effectively prevent environmental accidents caused by direct discharge of raw coal gas.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven raw gas release, and more specifically, to an online capacity expansion and upgrading system for raw gas release. Background Art

[0002] The amount of gas used during the operation of the coke oven usually fluctuates. If the fluctuating gas usage leads to unstable pressure in the coke oven pipe network, or there is a sudden power outage or a failure in the raw gas drainage system, the pressure of the gas collecting pipe will continue to rise and not fall. The gas must be released in a release manner. At present, the ignition of the coke oven gas collecting pipe release system is to set a clean gas pipe on the upper part of the release pipe. When the pressure of the gas collecting pipe exceeds the set pressure, the clean gas sprayed from the clean gas pipe is first ignited by electronic ignition, and then the gas release valve is opened to release the gas. In the prior art, in order to prevent the released raw gas from entering the atmosphere and causing environmental pollution, a coke oven automatic release ignition system is usually used. When the pressure of the coke oven gas collecting pipe exceeds the normal value, the DCS and output module are used to control the motor connected to the release valve of the release pipe to open the release valve to complete the raw gas release operation, and then the igniter set at the release pipe mouth is controlled to ignite the clean gas, and then the released raw gas is ignited by the clean gas.

[0003] Production practice shows that the device has the following main deficiencies: First, after the coke oven has been in operation for many years, there is tar enrichment attached to the gas collecting pipe. Due to untimely release, the riser cover is often pushed open by the rapidly rising gas in the gas collecting pipe, and the raw gas is released into the atmosphere without burning; second, the released gas is not burned completely, causing serious environmental pollution; third, the ignition success rate of the ignition system is not high, and manual ignition is often required; fourth, the operation of the release system lags behind the fluctuation of the gas pressure, which further aggravates the fluctuation of the gas pressure in the gas pipe, and excessive release occurs, wasting gas. Utility Model Content

[0004] One purpose of the utility model is to provide an online capacity expansion and upgrading system for releasing raw coal gas, so as to solve the problem of insufficient release capacity of existing coke ovens, ensure safe release without affecting normal production, ensure that the raw coal gas can be ignited and burned in time when the coke oven is released, and effectively prevent environmental accidents caused by direct discharge of raw coal gas.

[0005] In order to solve the above technical problems, the utility model provides an online capacity expansion and upgrading system for releasing raw coal gas, including a pressurized perforated short section, a release pipe connected to the pressurized perforated short section, a burner and an ignition device connected to the top of the release pipe, a control system, a steam ignition and steam fire extinguishing system, the pressurized perforated short section is fixedly connected to a gas collecting pipe and is provided with an opening valve, the pressurized perforated short section is connected to the release pipe through an electric flap valve, a pressure measuring point is provided on the gas collecting pipe, the control system controls the opening and closing of the opening valve and the opening and closing and the opening size of the electric flap valve, the control system is connected to the pressure measuring point to obtain the pressure value in the gas collecting pipe, the control system is connected to the ignition device to control ignition, and the control system controls the steam ignition and steam fire extinguishing system to perform ignition and fire extinguishing.

[0006] Preferably, the gas collecting pipe is opened under pressure at a position where the wall thickness is greater than 8 to 12 mm for connecting the opened under pressure short section.

[0007] Preferably, the ignition device includes a two-stage ignition control, the first-stage ignition uses a high-energy igniter, and the second-stage ignition uses an electric thermal igniter, preferably a silicon carbide electric thermal igniter or a silicon nitride electric thermal igniter.

[0008] Preferably, it also includes a vent pipe structure support, which is used to support the vent pipe and the gas collecting pipe. The vent pipe structure support is arranged on multiple furnace columns to form a cross-furnace column dispersed force structure.

[0009] Preferably, the steam ignition and steam fire extinguishing systems are connected to the burner and the top of the vent pipe through lines, and steam ignition valves and steam fire extinguishing valves are respectively provided on the lines, and the control system controls the opening and closing of the steam ignition valves and the steam fire extinguishing valves.

[0010] Preferably, it also includes a fast water injection facility connected to the electric flap valve, and the control system controls the fast water injection facility to quickly inject water into the electric flap valve, so that the electric flap valve establishes a water seal.

[0011] Preferably, the control system is also provided with a UPS backup power supply, which is used to supply power to the control system and the ignition device.

[0012] Preferably, a plurality of vent pipes are provided on the gas collecting pipe, which correspond to the same control system. The control system is configured to control the plurality of vent pipes simultaneously or individually. The control system is controlled by wireless remote control, online local control or manual control.

[0013] Preferably, a reinforcing rib group is provided at the pressurized opening of the gas collecting pipe, which reinforces the gas collecting pipe in both axial and radial directions.

[0014] Preferably, the burner is provided with an induced draft mixer, which adopts a steam / nitrogen forced induced draft method, that is, a primary induced draft and a secondary mixed air method.

[0015] The utility model at least has the following beneficial effects:

[0016] 1. The online capacity expansion and upgrading scheme provided in this application is aimed at the existing coke ovens with insufficient venting capacity. The wall thickness of the gas collecting pipe is measured and the structure is evaluated. The site selection is scientific and convenient. After the pressure hole is opened, the venting pipe is supported by a dispersed force structure arrangement. No major changes are made to the pipelines around the gas collecting pipe. The overall transformation is safe, reliable and economical. Without affecting normal production, safe venting can be guaranteed. Combined with the automatic ignition device for raw gas, environmental accidents caused by direct discharge of raw gas can be effectively prevented.

[0017] 2. In the pressure-opening process of this application, the weld at the opening is reinforced with ribs to ensure the safety of the opening of the gas collecting pipe.

[0018] 3. This application adopts steam forced draft method, and the upper draft mixer of the device adopts primary draft and secondary air mixing. When ignited and released, the raw gas of the coke oven undergoes the primary draft and secondary air mixing process in the draft mixer, so that the raw gas and the air from the steam forced draft are fully mixed, and through the swirl effect of the internal guide plate of the burner (draft mixer), a rotating combustion flame zone is formed, thereby achieving full combustion, eliminating black smoke, and meeting the safe and environmentally friendly emission standards.

[0019] 4. The water seal electric flap valve of the vent pipe in this application adopts a quick opening type. Each electric flap valve can accurately adjust the opening to any degree. The system is configured with two modes: individual adjustment and linkage adjustment to ensure the stability of the gas collecting pipe pressure.

[0020] 5. The automatic ignition device of this application adopts a multi-stage series configuration, and the ignition mode is automatically controlled in a logical sequence; all discharge pipes are equipped with a steam fire extinguishing purge system to ensure that the fire is extinguished after the discharge is complete, to prevent backfire from occurring, and to achieve unattended operation.

[0021] 6. The vent pipe support in this application adopts a cross-furnace column dispersed force structure support to avoid force concentration on a single furnace column.

[0022] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a top view of the utility model;

[0025] Figure 3 It is a partial enlarged view of the steam fire-fighting and steam fire-extinguishing system of the utility model.

[0026] Description of reference numerals:

[0027] 1. Vent pipe, 2. Electric flap valve, 3. Opening valve, 4. Gas collecting pipe, 5. Control system, 6. Vent pipe structure support, 7. Burner, 8. Ignition device, 9. Rapid water injection facility, 10. Steam fire control and steam fire extinguishing system, 10-1. Steam fire control valve, 10-2. Steam fire extinguishing valve, 11. Pressurized opening short section, 12. Reinforcement rib group, 13. UPS backup power supply, 14. Furnace column. DETAILED DESCRIPTION

[0028] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0029] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 3 As shown, the utility model provides an online capacity expansion and upgrading system for releasing raw coal gas, including a pressurized perforated short section 11, a release pipe 1 connected to the pressurized perforated short section 11, a burner 7 and an ignition device 8 connected to the top of the release pipe 1, a control system 5, and a steam ignition and steam fire extinguishing system 10. The pressurized perforated short section 11 is fixedly connected to a gas collecting pipe 4 and is provided with a perforated valve 3. The pressurized perforated short section 11 is connected to the release pipe 1 through an electric flap valve 2. A pressure measuring point is provided on the gas collecting pipe 4. The control system 5 controls the opening and closing of the perforated valve 3 and the opening and closing and the opening size of the electric flap valve 2. The control system 5 is connected to the pressure measuring point to obtain the pressure value in the gas collecting pipe 4. The control system 5 is connected to the ignition device 8 to control ignition. The control system 5 controls the steam ignition and steam fire extinguishing system 10 to ignite the release pipe 1 and extinguish the burner 7. The gas collecting pipe 4 is opened under pressure at a position where the wall thickness is greater than 8-12 mm for connecting the opened under pressure short section 11 .

[0031] The system of the present application is to select the top or side for pressure opening according to the surrounding conditions of the gas collecting pipe 4 to expand the area of ​​the overall coke oven discharge pipe 1 when the raw gas pressure is high and it is difficult to release during the operation of the coke oven. Before the pressure opening, the wall thickness of the gas collecting pipe 4 is measured. When the point selection requirements are met, that is, when the wall thickness near the pressure opening point of the gas collecting pipe 4 is greater than 8-12mm, the pressure opening can be carried out. After the coke oven gas collecting pipe 4 is pressure opened, according to the pipe diameter and the wall thickness conditions of the opening position, the pressure opening short section 11 is set, the opening valve 3 is configured, the discharge pipe 1, the electric flap valve 2 and the top burner 7 and the ignition device 8 are connected, the water seal electric flap valve 2 of the discharge pipe 1 adopts a quick opening form, and each discharge electric flap valve 2 can accurately realize any opening adjustment. The system is configured with two modes of individual adjustment and linkage adjustment to ensure the stability of the pressure of the gas collecting pipe 4. At the same time, the overall system is equipped with a steam fire suppression and steam extinguishing system 10, a rapid water injection facility 9, a UPS backup power supply 13, and a PLC control system 5 to ensure the safe and reliable operation of the overall system.

[0032] In another technical solution, the ignition device 8 includes a two-stage ignition control, the first-stage ignition uses a high-energy igniter, and the second-stage ignition uses an electric thermal igniter, preferably a silicon carbide electric thermal igniter or a silicon nitride electric thermal igniter.

[0033] The ignition method of the present application adopts sequential ignition, and it is a different ignition method. The two ignition control principles are different. Compared with the existing method using the same ignition principle, it can prevent the same ignition principle from failing to ignite during the secondary ignition, thereby ensuring the ignition success rate. The automatic ignition device 8 adopts a multi-stage serial configuration, and the ignition method is automatically controlled in a logical order. All vent pipes 1 are equipped with a steam fire extinguishing purge system to ensure that the fire is extinguished after the vent is complete, prevent backfire from occurring, and achieve unattended operation.

[0034] In another technical solution, a vent pipe structure support 6 is further included, which is used to support the vent pipe 1 and the gas collecting pipe 4. The vent pipe structure support is arranged on a plurality of furnace columns 14 to form a cross-furnace column dispersed force structure.

[0035] A vent pipe structural support 6 is provided between the vent pipe 1 and the gas collecting pipe 4. The vent pipe 1 is arranged with a dispersed force structure, which can facilitate the support arrangement of the vent pipe 1 at any selected point, reduce the requirements for the selection of opening points, and achieve the purpose of expanding the opening area of ​​the overall gas collecting pipe 4. The vent pipe structural support 6 adopts a dispersed force structure across the furnace column 14 to avoid the concentration of force on a single furnace column 14, and because of the flexible support, the system reduces the requirements for the selection of the opening point of the gas collecting pipe 4 under pressure.

[0036] In another technical solution, the steam ignition and steam fire extinguishing system 10 is connected to the burner 7 and the top of the vent pipe 1 through lines, and a steam ignition valve 10-1 and a steam fire extinguishing valve 10-2 are respectively provided on the lines, and the control system 5 controls the opening and closing of the steam ignition valve 10-1 and the steam fire extinguishing valve 10-2.

[0037] In another technical solution, a fast water injection facility 9 is also included, which is connected to the electric flap valve 2. The control system 5 controls the fast water injection facility 9 to quickly inject water into the electric flap valve 2, so that the electric flap valve 2 establishes a water seal.

[0038] In another technical solution, the control system 5 is further provided with a UPS backup power supply 13 , which is used to supply power to the control system 5 and the ignition device 8 .

[0039] When the system cannot work normally due to factors such as sudden power outage or sudden power outage, in order to ensure that the coke oven automatic dispersion ignition control system 5 can work normally, the control system 5 of this scheme also includes a UPS backup power supply 13, and the UPS backup power supply 13 is electrically connected to the power-consuming devices in the control system 5 respectively, and the control system 5 and the automatic ignition device 8 are supplied with power through the UPS to ensure that the system can achieve dispersion ignition under extreme conditions.

[0040] In another technical solution, a plurality of vent pipes 1 are provided on the gas collecting pipe 4, which correspond to the same control system 5. The control system 5 is configured to simultaneously control the plurality of vent pipes 1 or to individually control the plurality of vent pipes 1. The control system 5 is controlled by wireless remote control, online local control or manual control.

[0041] The present application combines remote control, local control and manual control to make the control function of the entire system flexible and convenient, eliminating the impact of a failure of a control device in the system causing the entire system to fail to operate. Multiple vent pipes 1 are controlled by a control system 5, which can control one or multiple at the same time.

[0042] In another technical solution, a reinforcing rib group 12 is provided at the pressurized opening of the gas collecting pipe 4 to reinforce the gas collecting pipe 4 in both axial and radial directions.

[0043] An opening reinforcement rib group 12 is provided at the opening of the gas collecting pipe 4. The opening reinforcement rib group 12 is provided at the opening using a scientific structural stress model calculation, and the gas collecting pipe 4 is reinforced in both axial and radial directions to ensure the structural safety of the opening point.

[0044] In another technical solution, an induced draft mixer is provided in the burner 7, which adopts a steam forced induced draft method, that is, a primary induced draft and a secondary mixed air method.

[0045] Burner 7 adopts steam / nitrogen forced draft mode, generally steam induced draft. When external conditions are met, nitrogen can also be used as the conveying gas, using primary induced draft and secondary mixed air. When ignition and dispersion, the coke oven raw gas undergoes the process of primary induced draft and secondary mixed air in the induced draft mixer, so that the raw gas and the air from the steam forced draft are fully mixed, and the swirl effect of the internal guide plate of the burner 7 forms a rotating combustion flame zone, thereby achieving full combustion, eliminating black smoke, and meeting safe and environmentally friendly emission standards.

[0046] In the specific operation of the present application, the pressure value in the gas collecting pipe 4 is obtained through the automatic control system 5, and it is determined whether the pressure value in the gas collecting pipe 4 is greater than the set pressure upper limit. Figure 1 P is the pressure measuring point.

[0047] If the pressure value of the gas collecting pipe 4 is greater than the upper pressure limit, the electric flap valve 2 is controlled to open the valve quickly to release. When the pressure at the pressure measuring point of the gas collecting pipe 4 is greater than 350Pa-400Pa, the delay is 60 seconds and it remains unchanged, and then release is carried out. At the same time, the ignition device 8 set at the mouth of the release pipe 1 is controlled to ignite. The ignition device 8 is configured with two-stage sequential control. When the first-stage ignition device 8 detects that the ignition fails, the second-stage ignition is started. The first-stage ignition uses a high-energy igniter, and the second-stage ignition uses an electric igniter, preferably a silicon carbide electric igniter or a silicon nitride electric igniter, to ensure that the ignition is 100% successful. After igniting the raw gas, the control system 5 automatically opens the steam fire-collecting valve 10-1 in the steam fire-collecting and steam fire-extinguishing system 10 to collect the fire of the released raw gas, collect the flame, and increase the height of the torch flame combustion to meet the environmental emission requirements.

[0048] If the pressure value of the gas collecting pipe 4 is less than the upper pressure limit, the electric flap valve 2 is controlled to gradually close the release valve, and the steam fire extinguishing valve 10-2 in the steam fire suppression and steam extinguishing system 10 is opened. After the electric flap valve 2 is completely closed, the pipeline is quickly purged with steam to avoid backfire in the release pipe 1. At the same time, the automatic PLC control system 5 controls the rapid water injection facility 9 of the electric flap valve 2 to quickly inject water to ensure that the water seal of the electric flap valve 2 is established. At this point, the release process ends.

[0049] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrations shown and described here.

Claims

1. A system for online expansion and upgrading of waste gas release, characterized in that: It includes a pressurized open hole short section, a discharge pipe connected to the pressurized open hole short section, a burner and an ignition device connected to the top of the discharge pipe, a control system, a steam fire-gathering and steam fire-extinguishing system, the pressurized open hole short section is fixedly connected to the gas collecting pipe and is provided with an open hole valve, the pressurized open hole short section is connected to the discharge pipe through an electric flap valve, a pressure measuring point is provided on the gas collecting pipe, the control system controls the opening and closing of the open hole valve and the opening and closing of the electric flap valve and the opening size, the control system is connected to the pressure measuring point to obtain the pressure value in the gas collecting pipe, the control system is connected to the ignition device to control ignition, and the control system controls the steam fire-gathering and steam fire-extinguishing system to gather and extinguish the fire.

2. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: The gas collecting pipe is opened under pressure at a position where the wall thickness is greater than 8-12 mm for connecting the opened under pressure short section.

3. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: The ignition device includes a two-stage ignition control, the first-stage ignition adopts a high-energy igniter, and the second-stage ignition adopts an electric heating igniter.

4. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: It also includes a vent pipe structure support, which is used to support the vent pipe and the gas collecting pipe. The vent pipe structure support is arranged on multiple furnace columns to form a cross-furnace column dispersed force structure.

5. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: The steam ignition and steam fire extinguishing systems are connected to the burner and the top of the vent pipe through lines, and steam ignition valves and steam fire extinguishing valves are respectively arranged on the lines. The control system controls the opening and closing of the steam ignition valves and the steam fire extinguishing valves.

6. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: It also includes a fast water injection facility, which is connected to the electric flap valve. The control system controls the fast water injection facility to quickly inject water into the electric flap valve, so that the electric flap valve establishes a water seal.

7. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: The control system is also provided with a UPS backup power supply, which is used to supply power to the control system and the ignition device.

8. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1 is characterized in that: The gas collecting pipe is provided with a plurality of venting pipes, which correspond to the same control system. The control system is configured to control the plurality of venting pipes simultaneously or individually. The control system is controlled by wireless remote control, online local control or manual control.

9. The online capacity expansion and upgrading system for releasing raw coal gas as claimed in claim 2 is characterized in that: A reinforcing rib group is provided at the pressurized opening of the gas collecting pipe, which reinforces the gas collecting pipe in both axial and radial directions.

10. The online capacity expansion and upgrading system for releasing raw coal gas according to claim 1, characterized in that: The burner is provided with an induced draft mixer, which adopts a steam / nitrogen forced induced draft mode, that is, a primary induced draft and a secondary mixed air mode.

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