Stability maintaining assembly of blast furnace coal injection pulverized coal filter for iron works

Abstract

The utility model discloses a stability maintaining assembly of a blast furnace coal injection pulverized coal filter for an iron making plant, which comprises a coal injection header pipe, a coal injection pipe A, a coal injection pipe B, a pulverized coal filter, an inlet normally-open standby valve, an outlet normally-open standby valve, an inlet working valve, an outlet working valve, a blow-down branch pipe, a blow-down header pipe, a blow-down valve and a blow-down valve, the inlet normally-open standby valve and the outlet normally-open standby valve are both provided with portable mechanical locks, the air inlet end of the purging valve is connected with a nitrogen spraying device, and a blow-down branch pipe on the rear side of the blow-down valve is sequentially provided with a detection valve A and a detection valve B; a plurality of groups of pulverized coal collecting devices are arranged on the blowdown main pipe and are connected with the blowdown main pipe through blanking valves. According to the utility model, after practical application, even if misoperation occurs, harm caused by misoperation can be avoided, essential operation safety is achieved, maintenance can be completely realized, and the situation that the pulverized coal collector is full of leaked pulverized coal is avoided.

Description

Technical Field

[0001] This utility model patent belongs to the field of chute cleaning technology, specifically relating to a stabilization component for a pulverized coal filter used in blast furnaces of ironmaking plants. Background Technology

[0002] The pulverized coal filter device on the blast furnace pulverized coal injection main pipe is an important device to ensure the stability and continuity of pulverized coal injection in the blast furnace. During normal pulverized coal injection, the filter group is switched online. A clean filter group is put into use, and a filter group that has been used offline for a certain period of time is cleaned of impurities. Through periodic switching, cleaning and use, the smooth delivery of pulverized coal during blast furnace pulverized coal injection is ensured, the pressure of the main pipe and the fluctuation of pulverized coal flow are reduced, and the injection system can stably and smoothly inject pulverized coal into the blast furnace.

[0003] Existing blast furnace pulverized coal injection main pipe pulverized coal filter, such as the stabilization component of a blast furnace pulverized coal injection pulverized coal filter for ironmaking plants disclosed in Chinese Patent (CN213589962U), includes a pulverized coal injection main pipe, a pulverized coal filter connected to a DN25 purge inlet pipe, a DN25 purge inlet valve embedded in the middle of the DN25 purge inlet pipe, a pulverized coal filter connected to a DN25 drain pipe, a DN25 drain valve embedded in the middle of the DN25 drain pipe, a DN25 drain pipe connected to a DN65 drain main pipe, a pulverized coal collection bin equipped with a single-unit bag filter, and a pulverized coal collection bin connected to a DN200 discharge pipe, a DN200 discharge valve embedded in the middle of the DN200 discharge pipe.

[0004] After making improvements and applying the technology, the inventors discovered the following technical defects in the filter assembly:

[0005] 1. The filter group has 8 DN100 pipe valves installed in a dense space, including 4 normally open spare valves at the outlet and inlet, and 4 working valves during switching. The large number of valves and their dense location make it particularly easy for the normally open valves to be accidentally closed during the filter cleaning process. This can cause the blast furnace to stop spraying in just a moment, affecting the adjustment of the blast furnace condition.

[0006] 2. The filter drain pipe is only equipped with a single DN25 internal thread ball valve as a drain valve. The ball valve sealing surface is prone to wear and leakage is difficult to troubleshoot. During normal coal injection, coal dust often leaks out through the drain valve into the coal dust collector, causing large fluctuations in the pressure and flow of the coal injection main pipe. At the same time, it causes the coal dust collector to overflow with coal dust, affecting equipment safety.

[0007] To address the aforementioned issues, this invention proposes a stabilization component for a pulverized coal filter used in blast furnaces of ironmaking plants. Utility Model Content

[0008] To address the aforementioned issues, this invention proposes a stabilization component for a pulverized coal injection filter used in ironmaking plants. Even in the event of misoperation during practical application, it can prevent harm caused by such misoperation, ensuring inherent operational safety. It also allows for complete maintenance and eliminates the possibility of pulverized coal leakage and overflowing of the pulverized coal collector.

[0009] To achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution: a stabilization component for a pulverized coal injection filter in a blast furnace of an ironmaking plant, comprising a main pulverized coal injection pipe, pulverized coal injection pipe A, pulverized coal injection pipe B, a pulverized coal filter, an inlet normally open standby valve, an outlet normally open standby valve, an inlet working valve, an outlet working valve, a drain branch pipe, a drain main pipe, a purge valve, and a drain valve. The main pulverized coal injection pipe is connected in the middle to two branch pulverized coal injection pipes A and B. Both pulverized coal injection pipes A and B are respectively equipped with the same inlet normally open standby valve, inlet working valve, pulverized coal filter, and outlet working valve from front to back. The system includes a valve and an outlet normally open backup valve. Both sets of coal powder filters are connected to a drain branch pipe, which is connected to the main drain pipe. The drain branch pipes are equipped with a purge valve and a drain valve, respectively located on the front and rear sides of the coal powder filters. Both the inlet and outlet normally open backup valves are equipped with portable mechanical locks. The inlet end of the purge valve is connected to a nitrogen injection device. Detection valve A and detection valve B are sequentially installed on the drain branch pipe behind the drain valve. The main drain pipe is equipped with several sets of coal powder collection devices, which are connected to the main drain pipe via a discharge valve.

[0010] Preferably, the portable mechanical lock can be an engineering safety universal valve lock.

[0011] Preferably, the portable mechanical lock further includes a frame, a spring limit seat, and a U-shaped limit card. The frame is installed on the front and rear sides of the valve, the frame is provided with a spring limit seat, and the U-shaped limit card can be inserted backward through the valve rotary switch and installed on the spring limit seat.

[0012] Preferably, the pulverized coal collection device further includes a silo, a support, a spring, a filter bag, an exhaust port, a one-way valve, a conical discharge port, and a discharge valve. The front side of the silo is connected to the main sewage pipe via a discharge valve. The support is installed on the top side inside the silo via a spring. Several filter bags are suspended below the support. An exhaust port is provided on the rear side of the silo, and a one-way valve is installed on the exhaust port. A conical discharge port is connected to the bottom of the silo, and a discharge valve is installed on the conical discharge port.

[0013] Preferably, a handle is connected to the top of the bracket, and the handle is located in a sealable observation port that can be opened and closed at the top of the chamber.

[0014] The beneficial effects of this utility model are:

[0015] This utility model plays a crucial role through a very simple improvement in process structure. First, it avoids accidental blast furnace interruption caused by misoperation of the normally open valves at the filter inlet and outlet. Second, it eliminates production safety accidents such as pressure fluctuations in the pulverized coal injection main pipe, pulverized coal flow fluctuations, interruption of injection, burning of the lance, and pulverized coal collector overflow caused by the failure to detect leakage in the pulverized coal filter drain valve in time. Third, it reduces the collection pressure of the original pulverized coal collector by adding a new type of pulverized coal collection device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] Figure 1 This is a structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the portable mechanical lock of this utility model;

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1. Pulverized coal injection main pipe; 2. Pulverized coal injection pipe A; 3. Pulverized coal injection pipe B; 4. Pulverized coal filter; 5. Inlet normally open standby valve; 6. Outlet normally open standby valve; 7. Inlet working valve; 8. Outlet working valve; 9. Sewage branch pipe; 10. Sewage main pipe; 11. Purge valve; 12. Sewage valve; 13. Portable mechanical lock; 14. Detection valve A; 15. Detection valve B; 16. Pulverized coal collection device; 17. Feed valve; 18. Frame; 19. Spring limit seat; 20. U-shaped limit clamp. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. Example 1

[0022] like Figure 1As shown, the existing technology in this embodiment has the following problems: Based on the existing technology, after making improvements and applications, the inventors found that the filter group also has the following technical defects: The filter group has 8 DN100 pipe valves installed in a dense space, including 4 normally open spare valves at the outlet and inlet, and 4 working valves during switching. The large number of valves and their dense location make it particularly easy for the normally open valves to be closed by accident during the cleaning of the filter screen. This can cause the blast furnace to stop injecting coal in just a moment, affecting the adjustment of the blast furnace condition; The filter drain pipe is only equipped with 1 DN25 internal thread ball valve as the drain valve. The sealing surface of the ball valve is prone to wear, and leakage is difficult to troubleshoot. During normal coal injection, coal powder often leaks out through the drain valve into the coal powder collector, causing large fluctuations in the pressure and flow of the coal injection main pipe. At the same time, it causes the coal powder collector to be full of coal powder, affecting equipment safety.

[0023] Therefore, the inventor provides a stabilization component for a pulverized coal injection filter in a blast furnace of an ironmaking plant, including a main pulverized coal injection pipe 1, pulverized coal injection pipe A2, pulverized coal injection pipe B3, pulverized coal filter 4, inlet normally open standby valve 5, outlet normally open standby valve 6, inlet working valve 7, outlet working valve 8, drain branch pipe 9, drain main pipe 10, purge valve 11, and drain valve 12. The main pulverized coal injection pipe 1 is connected in the middle to two branch pulverized coal injection pipes A2 and B3. Both pulverized coal injection pipes A2 and B3 are equipped with identical inlet normally open standby valve 5, inlet working valve 7, pulverized coal filter 4, outlet working valve 8, and outlet normally open standby valve 6 from front to back. The two sets of pulverized coal filters... Each filter 4 is connected to a drain branch pipe 9, which is connected to the main drain pipe 10. The drain branch pipe 9 is equipped with a purge valve 11 and a drain valve 12, which are respectively located on the front and rear sides of the coal powder filter 4. The normally open inlet backup valve 5 and the normally open outlet backup valve 6 are both equipped with portable mechanical locks 13. The air inlet of the purge valve 11 is connected to a nitrogen injection device (not shown in the figure). The drain branch pipe 9 behind the drain valve 12 is equipped with a detection valve A14 and a detection valve B15 in sequence. The main drain pipe 10 is equipped with several sets of coal powder collection devices 16, which are connected to the main drain pipe 10 through a discharge valve 17.

[0024] Its effects and principles are as follows: This utility model plays an extremely important role through a very simple process structure improvement. First, it avoids the accidental interruption of blast furnace injection caused by misoperation of the normally open valves of the filter inlet and outlet. Second, it eliminates production safety accidents such as pressure fluctuations, pulverized coal flow fluctuations, injection interruption, lance burning, and pulverized coal collector overflow caused by the failure to detect leakage of the pulverized coal filter 4 drain valve 12 in time. Third, it reduces the collection pressure of the original pulverized coal collector by adding a new type of pulverized coal collection device 16.

[0025] The mechanical lock in this component is installed on the normally open standby valve 6 at the inlet and outlet. It locks the valve core in the normally open position during normal use and is only put into use after manual unlocking when the valve is under maintenance or when the working valve is worn out and not closing tightly. After the improvement, even if there is a misoperation, it will not cause a misoperation result, thus achieving inherent operational safety.

[0026] Detection valve B15: When detecting leakage in drain valve 12, detection valve B15 closes to hold the pressure. It works in conjunction with detection valve A14. If detection valve A14 releases pressure, it indicates that drain valve 12 is not closing properly or is leaking due to wear. When wear leakage in drain valve 12 is detected, drain valve 12B functions as a sealing valve to stop the leaking coal powder and prevent accidents such as main pipe pressure fluctuations, coal powder flow fluctuations, and coal powder collector overflow.

[0027] Detection valve A14: Normally closed. When it is necessary to test the drain valve 12, it is opened to cooperate with the closure of detection valve 1 to detect whether the drain valve 12 is not closed properly or is worn and leaking.

[0028] In summary, when coal injection is not smooth and the coal powder filter 4 on the in-use coal injection pipe A2 needs cleaning, first switch to the cleaned spare coal powder filter 4 on the coal injection pipe B3. After switching to the spare, the drain valve 12 is in the closed state. To prevent internal wear and leakage of the drain valve 12, the sealing performance of the drain valve 12 must be tested. Close the detection valve B15 → slightly open the detection valve A14 → coal powder is found to be spraying out, indicating a leak in the drain valve 12 → keep the detection valve B15 closed, close the detection valve A14, and seal the leakage channel of the coal powder. The drain valve 12 will be replaced when this set of filters is switched off the production line in the next cycle. The leakage test of the drain valve 12 of the other set of filters is conducted in the same way.

[0029] Furthermore, the portable mechanical lock 13 can be an engineering safety universal valve lock; the device can use the SQ-Z41 engineering safety universal valve lock from the SQSLOCK brand, but the inventor found the disassembly and assembly troublesome, so the following portable mechanical lock 13 was developed. Example 2

[0030] like Figure 2As shown, based on the above embodiments, the inventors also provide a portable mechanical lock 13, including a frame 18, a spring-loaded retaining seat 19, and a U-shaped retaining clip 20. The frame 18 is installed on the front and rear sides of the valve, and the spring-loaded retaining seat 19 is provided on the frame 18. The U-shaped retaining clip 20 can be inserted upside down through the valve rotary switch and installed on the spring-loaded retaining seat 19. When using this structure, the frame 18 can be installed on the front and rear sides of the normally open inlet valve 5 and the normally open outlet valve 6, with the spring-loaded retaining seat 19 facing the valve rotary switch. Then, the U-shaped retaining clip 20 is inserted upside down through the valve rotary switch and installed on the spring-loaded retaining seat 19, so that both ends of the U-shaped retaining clip 20 are engaged in the spring-loaded retaining seat 19. When the valve needs to be used, the spring-loaded retaining seat 19 can be pulled to release the U-shaped retaining clip 20 and pull it out, thus achieving quick unlocking. Example 3

[0031] Based on the above embodiments, the inventors also provided a coal powder collection device 16 (not shown in the figure), including a silo, a support, a spring, a filter bag, an exhaust port, a one-way valve, a conical discharge port, and a discharge valve. The front side of the silo is connected to the main sewage pipe 10 via a discharge valve 17. The support is installed on the top side inside the silo via a spring. Several filter bags are suspended below the support. An exhaust port with a one-way valve is provided on the rear side of the silo. A conical discharge port with a discharge valve is connected to the bottom of the silo. This structure is designed to accommodate more coal powder and prevent silo explosion in emergencies. During use, dust can be reduced by the filter bags, coal powder can be collected by the conical discharge port, and discharged by the discharge valve. The exhaust port and one-way valve can discharge the filtered exhaust gas. The support installed by the spring can facilitate manual shaking of the coal powder on the filter bags, thereby improving collection efficiency.

[0032] Furthermore, a handle is connected to the top of the bracket, and the handle is located in the openable and sealable observation port at the top of the compartment. The observation port in this structure is openable and can also be sealed by a sealing ring. Normally, the condition of the cloth bag in the drawer can be observed through the observation port. When it is necessary to shake the cloth bag, the observation port can be opened, and the handle can be lifted up and down to shake off the powder on the cloth bag, thereby improving the collection efficiency.

[0033] The working principle of this utility model:

[0034] When coal injection is not smooth and the coal powder filter 4 on the in-use coal injection pipe A2 needs to be cleaned, first switch to the cleaned spare coal powder filter 4 on the coal injection pipe B3. After being put into use, the drain valve 12 is in the closed state. To prevent internal wear and leakage of the drain valve 12, the sealing performance of the drain valve 12 must be tested. Close the detection valve B15 → slightly open the detection valve A14 → coal powder is found to be sprayed out, indicating that the drain valve 12 is leaking → keep the detection valve B15 closed, close the detection valve A14, and seal the leakage channel of the coal powder. When switching this group of filters off the production line in the next cycle, the drain valve 12 will be replaced. The leakage test of the drain valve 12 of the other group of filters is the same. In addition, a new type of coal powder collection device 16 is installed to bear the collection pressure of the original coal powder collector.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stabilization component for a pulverized coal injection filter for a blast furnace in an ironmaking plant, comprising a main pulverized coal injection pipe (1), pulverized coal injection pipe A (2), pulverized coal injection pipe B (3), a pulverized coal filter (4), an inlet normally open standby valve (5), an outlet normally open standby valve (6), an inlet working valve (7), an outlet working valve (8), a drain branch pipe (9), a drain main pipe (10), a purge valve (11), and a drain valve (12), wherein the main pulverized coal injection pipe (1) is connected in the middle to two branch pulverized coal injection pipes A (2) and B (3), wherein the pulverized coal injection pipe A (2) is connected to the drain main pipe (3) in the middle. 2) Each of the coal injection pipes B (3) is equipped with the same inlet normally open standby valve (5), inlet working valve (7), coal powder filter (4), outlet working valve (8), and outlet normally open standby valve (6) from front to back. Both sets of coal powder filters (4) are connected to a drain branch pipe (9) and are connected to the main drain pipe (10) through the drain branch pipe (9). The drain branch pipe (9) is equipped with a purge valve (11) and a drain valve (12) and is respectively located on the front and rear sides of the coal powder filter (4); the feature is: The normally open inlet backup valve (5) and normally open outlet backup valve (6) are both equipped with portable mechanical locks (13). The air inlet of the purge valve (11) is connected to a nitrogen injection device. The drain branch pipe (9) behind the drain valve (12) is equipped with detection valve A (14) and detection valve B (15) in sequence. The main drain pipe (10) is equipped with several sets of coal powder collection devices (16), and the coal powder collection devices (16) are connected to the main drain pipe (10) through the discharge valve (17).

2. The stabilization component of a pulverized coal injection filter for blast furnaces in ironmaking plants according to claim 1, characterized in that: The portable mechanical lock (13) can be an engineering safety universal valve lock.

3. The stabilization component of a pulverized coal injection filter for blast furnaces in ironmaking plants according to claim 1, characterized in that: The portable mechanical lock (13) also includes a frame (18), a spring limit seat (19), and a U-shaped limit card (20). The frame (18) is installed on the front and rear sides of the valve. The frame (18) is provided with a spring limit seat (19). The U-shaped limit card (20) can be inserted upside down through the valve turntable switch and installed on the spring limit seat (19).

4. The stabilization component of a pulverized coal injection filter for blast furnaces in ironmaking plants according to claim 1, characterized in that: The coal powder collection device (16) further includes a silo, a support, a spring, a cloth bag, an exhaust port, a one-way valve, a conical discharge port, and a discharge valve. The front side of the silo is connected to the main sewage pipe (10) through a discharge valve (17). The support is installed on the top side inside the silo through a spring. Several cloth bags are suspended below the support. An exhaust port is provided on the rear side of the silo and a one-way valve is installed on the exhaust port. A conical discharge port is connected to the bottom of the silo and a discharge valve is installed on the conical discharge port.

5. The stabilization component of a pulverized coal injection filter for blast furnaces in ironmaking plants according to claim 4, characterized in that: The bracket is connected to a handle, which is located in a sealable observation port on the top of the chamber that can be opened and closed.

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