Device for protecting gas pulse valve in front of burner and implementation method

Abstract

The invention discloses a device for protecting a gas pulse valve in front of a burner and an implementation method, and belongs to the technical field of heating furnaces. The device comprises a manual sealing butterfly valve, a pulse valve, a burner and a connecting pipe, the manual sealing butterfly valve is located at the upper end of the pulse valve and is in sealing connection with the pulse valve through the connecting pipe, and the device is characterized in that a second bent pipe is arranged between the burner and the pulse valve. The problems that an existing burner protection structure and an implementation mold of the existing burner protection structure can only wrap and protect a burner, connection among the burner, a pulse valve and a manual sealing butterfly valve cannot be protected, high-temperature flue gas can directly reach the gas pulse valve during high-temperature transmission, and a soft sealing structure of the pulse valve is damaged are solved. Conveying high-temperature flue gas is limited and retained through the first bent pipe and the second bent pipe, the high-temperature flue gas is prevented from being conveyed to the pulse valve at the rear end, and the sealing connection effect of the pulse valve is prevented from being affected.

Description

Technical Field

[0001] The invention relates to the technical field of heating furnaces, in particular to a device for protecting a gas pulse valve in front of a burner and an implementation method thereof. Background Art

[0002] With the development of the steel industry, some special steel grades and customized production are increasingly valued by steel production enterprises, and higher requirements are put forward for energy conservation, environmental protection and consumption reduction in the steel industry. The heating furnace is one of the most critical equipment in the steel rolling industry. Its control goal is to achieve the economic indicators of minimum billet surface burning loss and energy consumption under the condition of meeting the billet temperature distribution required for rolling mill. The intelligent combustion control system adopts the principles and theories of air-fuel ratio double cross limit control, pulse combustion control, fuzzy control, etc. to control the heating furnace to burn in the best combustion mode. In the environment of multi-specification and small-batch production of special steel, the implementation of the intelligent combustion control system in the heating furnace can improve the billet heating quality, reduce the billet oxidation burning loss, improve the thermal efficiency of the heating furnace, and reduce the fuel energy consumption of the heating furnace, which is of great significance to the energy conservation of steel enterprises. The special steel production line involves many types of steel and has great differences in chemical composition, grain structure, and performance requirements. The heating process system and heating quality control requirements of billets of different types of steel are also very different. Surface decarburization is an important quality problem encountered in the hot rolling production of special steel, which has a significant impact on the final use performance of the product. By subdividing the temperature control area of ​​the heating section of the heating furnace, accurate control of the furnace temperature in each area can be achieved, which can not only meet the heating requirements of steel billets of different grades, but also effectively control the surface decarburization of steel billets that are prone to decarburization during the heating process.

[0003] In view of the above situation, the precise control of the burner, the core equipment in the combustion system of the heating furnace, and the efficient combustion under the rated state are crucial. On the one hand, it ensures the uniformity of the furnace temperature, and on the other hand, it ensures the atmosphere in the furnace and reduces the decarburization and oxidation burning of the billet. To meet the above problems, it is necessary to solve the safe and efficient operation of the burner and its ancillary equipment; in order to improve the heating quality of the billet, reduce fuel consumption and oxidation burning, especially the decarburization of special steel, the combustion system of the current heating furnace adopts pulse combustion control. It is increasingly important to accurately control the temperature of each section and zone. Therefore, the long-term stable operation of the pulse control of the burner is crucial. For the pulse control of the conventional combustion burner, it is necessary to configure air and gas pulse valves. Generally, the air is preheated to 450℃, while the gas is not preheated or preheated to about 200℃. Therefore, the gas pulse valve adopts a soft sealing structure and uses polytetrafluoroethylene as a sealing material to ensure zero leakage of gas. However, when the temperature of the pulse valve exceeds 250℃, the sealing material of the gas pulse valve will greatly shorten its service life. Since the burner is directly connected to the high-temperature flue gas in the furnace, when the burner stops working, the high-temperature flue gas in the furnace will spread along the burner to the connected air and gas pipes. Therefore, the temperature of the gas pipe and valve connected above the burner will rise rapidly. For polytetrafluoroethylene with a maximum operating temperature of 260℃, its sealing performance will gradually decrease after working in a high-temperature environment for a long time, so certain protective measures are required.

[0004] A Chinese patent with publication number CN222024317U discloses a novel gasifier burner protection structure and an implementation mold thereof, comprising a burner, a cooling water pipe and a casting material layer. A cooling water pipe is wound around the outer wall of the burner, a rectangular pouring port is provided in the middle of the joint position above the mold body, and locking buckles are provided on both sides of the pouring port. Before the burner works, a lot of construction time can be saved. During the operation of the burner, the damage to the burner can be effectively reduced, thereby ensuring the long-term operation of the gasifier. The casting mold has a simple structure, is easy to process, and has a low manufacturing cost.

[0005] The burner protection structure of the above patent and its implementation mold can only wrap and protect the burner, but the connection between the burner, pulse valve and manual sealing butterfly valve cannot be protected. When high temperature is transmitted, the high-temperature flue gas will directly reach the gas pulse valve, causing damage to the soft sealing structure of the pulse valve. Summary of the invention

[0006] The object of the present invention is to provide a device and implementation method for protecting the gas pulse valve in front of the burner, which limits and retains the transmitted high-temperature flue gas through the first bend pipe and the second bend pipe, avoids the high-temperature flue gas from being transmitted to the pulse valve at the rear end, avoids affecting the sealing connection effect of the pulse valve, and solves the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for protecting a gas pulse valve in front of a burner, comprising a manual sealing butterfly valve, a pulse valve, a burner and a connecting pipe, wherein the manual sealing butterfly valve is located at the upper end of the pulse valve and is sealed and connected through a connecting pipe, and is characterized in that a second bend is arranged between the burner and the pulse valve, a first bend is arranged between the second bend and the burner, the second bend and the first bend are mirror-distributed between the burner and the pulse valve, and an end of the second bend facing the first bend is sealed and connected to an end of the first bend facing the second bend through a connecting pipe.

[0008] Preferably, shock absorbers are provided at the lower end of the first curved pipe and the upper end of the second curved pipe.

[0009] Preferably, a protection frame is provided outside the two shock absorbers, and an inner wall of the protection frame is fixedly connected to one end of the shock absorber by a first connecting bolt.

[0010] Preferably, the two shock absorbers are respectively provided with first clamping blocks facing the bending positions of the second bend pipe and the first bend pipe, and the outside of the first clamping blocks is connected to the second bend pipe and the first bend pipe clamping groove.

[0011] Preferably, second clamping blocks are provided at both the front and rear ends of the middle of the protection frame, and the second clamping block is fixedly connected to the protection frame by a second connecting bolt.

[0012] Preferably, a pair of the second clamping blocks are connected to the connecting pipe slot between the first elbow and the second elbow.

[0013] The present invention provides another technical solution: an implementation method of a device for protecting a gas pulse valve in front of a burner, comprising the following steps:

[0014] S1: Install the first elbow and the second elbow in a mirror-image distribution between the burner and the pulse valve;

[0015] S2: A short connecting pipe is used between the first elbow and the second elbow to connect them into an S shape, forming two sets of 180° elbow structures;

[0016] S3: When the burner stops working, that is, after the pulse valve is closed, according to the principle of gas convection, that is, the principle of density difference, the high-temperature flue gas stays in two sets of 180° elbow structures during the transmission process, thereby protecting the soft sealing structure of the pulse valve.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention installs a first bend and a second bend between the burner and the pulse valve. The second bend and the first bend are distributed in a mirror image. The second bend and the first bend are connected in an S shape by a connecting pipe. That is, after the pulse valve is closed, the high-temperature flue gas will be restricted by the second bend and the first bend during transmission and will stay between the second bend and the first bend, thereby preventing the high-temperature flue gas from being transmitted to the pulse valve. This can facilitate the protection of the connection position between the built-in hose of the pulse valve and the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the overall external structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the protection frame of the present invention;

[0021] Figure 3 It is a cross-sectional view of the internal structure of the protection frame of the present invention;

[0022] Figure 4 It is a schematic diagram of the positional relationship between the first elbow and the second elbow of the present invention.

[0023] In the figure: 1. connecting pipe; 2. protection frame; 3. heat dissipation chamber; 4. first bent pipe; 5. second bent pipe; 6. first connecting bolt; 7. shock absorber; 8. first clamping block; 9. second clamping block; 10. second connecting bolt; 11. connecting frame; 12. manual sealing butterfly valve; 13. pulse valve; 14. burner. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments.

[0025] like Figure 1 As shown, a device for protecting a gas pulse valve in front of a burner in this embodiment comprises a manual sealing butterfly valve 12, a pulse valve 13, a burner 14 and a connecting pipe 1, wherein the connecting pipe 1 is divided into multiple sections, the manual sealing butterfly valve 12 is located at the upper end of the pulse valve 13 and is sealed and connected through the connecting pipe 1, a second elbow 5 is arranged between the burner 14 and the pulse valve 13, and a first elbow 4 is arranged between the second elbow 5 and the burner 14, when the high-temperature flue gas discharged from the burner 14 position is transmitted in the connecting pipe 1, the flue gas will flow in the second elbow 5 and the first elbow 4, and the bending of the second elbow 5 and the first elbow 4 will limit the transmission of the high-temperature flue gas, thereby preventing the transmission of the high-temperature flue gas from affecting the sealing state of the subsequent connection position;

[0026] Among them, Figure 2As shown, the second bend pipe 5 and the first bend pipe 4 are mirror-distributed between the burner 14 and the pulse valve 13, and one end of the second bend pipe 5 facing the first bend pipe 4 and one end of the first bend pipe 4 facing the second bend pipe 5 are sealedly connected through a connecting pipe 1. The second bend pipe 5 and the first bend pipe 4 are connected through the connecting pipe 1 to form an S shape, which can limit the transmission of high-temperature flue gas, and the high-temperature flue gas will stay in the second bend pipe 5 and the first bend pipe 4;

[0027] In addition, when the second bend pipe 5 and the first bend pipe 4 restrict the high-temperature flue gas, vibration will occur. The lower end of the first bend pipe 4 and the upper end of the second bend pipe 5 are both provided with a shock absorber 7. The vibration of the first bend pipe 4 and the second bend pipe 5 will be transmitted to the shock absorber 7 and buffered by the shock absorber 7.

[0028] In order to facilitate the efficient transmission of vibration to the shock absorber 7, as Figure 3 As shown, a protection frame 2 is provided outside the two shock absorbers 7, and the inner wall of the protection frame 2 is fixedly connected to one end of the shock absorber 7 by a first connecting bolt 6, and the two shock absorbers 7 are respectively provided with a first clamping block 8 at the bending position toward the second curved pipe 5 and the first curved pipe 4, and the outside of the first clamping block 8 is connected to the second curved pipe 5 and the first curved pipe 4 by the slot, and the shock absorber 7 is connected by bolts and supported by the first clamping block 8 on the outer wall of the second curved pipe 5 and the first curved pipe 4, and the shaking of the second curved pipe 5 and the first curved pipe 4 will be stably transmitted to the shock absorber 7 through the first clamping block 8;

[0029] In order to facilitate the stable connection of the protection frame 2, second clamping blocks 9 are provided at both ends of the front and rear ends in the middle of the protection frame 2, and the second clamping blocks 9 and the protection frame 2 are fixedly connected by second connecting bolts 10. The protection frame 2 is fixed to the outside of the connecting pipe 1 by the second clamping blocks 9, and a pair of second clamping blocks 9 are connected to the connecting pipe 1 slot between the first elbow 4 and the second elbow 5;

[0030] like Figure 1 and Figure 2 As shown, the other end of the first elbow 4 is sealedly connected to the pulse valve 13 through the connecting pipe 1, and the second elbow 5 is sealedly connected to the burner 14 through the connecting pipe 1. In order to further suspend and fix the protection frame 2, the upper end of one side and the lower end of the other side of the protection frame 2 are both provided with connecting frames 11, one of the connecting frames 11 is connected to the connecting pipe 1 between the first elbow 4 and the pulse valve 13 by a card slot, and the other connecting frame 11 is connected to the connecting pipe 1 between the second elbow 5 and the burner 14 by a card slot;

[0031] In order to facilitate cooling the wrapped position of the protection frame 2, as Figure 2 and Figure 3As shown, a pair of heat dissipation cavities 3 are provided at both the front and rear ends of the protection frame 2, and the heat dissipation cavities 3 penetrate the protection frame 2 and extend to the front and rear ends. The heat dissipation cavities 3 can facilitate heat dissipation at the wrapped position inside the protection frame 2.

[0032] Working principle: After the burner 14 stops working, the pulse valve 13 is closed. According to the principle of gas convection, the high-temperature flue gas is restricted by the first bend 4 and the second bend 5, and then stays in the first bend 4 and the second bend 5 to avoid continuous transmission of high-temperature flue gas affecting the subsequent sealing effect. When using this device, the first bend 4 and the second bend 5 will vibrate after restricting the high-temperature flue gas. The vibration of the first bend 4 and the second bend 5 will be transmitted to the shock absorber 7 through the first clamping block 8, and the shock absorber 7 will dampen the vibration. The protection frame 2 will be fixed by clamping the connecting pipe 1 through the connecting frame 11 and a pair of second clamping blocks 9, and the fixing of the protection frame 2 can support the shock absorber 7.

[0033] like Figure 4 As shown, in order to further better explain the above invention, the embodiment of the present invention also provides an implementation method of a device for protecting a gas pulse valve in front of a burner, comprising the following steps:

[0034] S1: Install the first elbow 4 and the second elbow 5 in a mirror-image arrangement between the burner 14 and the pulse valve 13;

[0035] S2: A short connecting pipe 1 is used between the first elbow 4 and the second elbow 5 to connect them into an S shape, forming two sets of 180° elbow structures;

[0036] S3: After the burner 14 stops working, that is, the pulse valve 13 is closed, according to the gas convection principle, that is, the density difference principle, the high-temperature flue gas stays in the two sets of 180° elbow structures during the transmission process, thereby protecting the soft sealing structure of the pulse valve 13.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A device for protecting a gas pulse valve in front of a burner, comprising a manual sealing butterfly valve (12), a pulse valve (13), a burner (14) and a connecting pipe (1), wherein the manual sealing butterfly valve (12) is located at the upper end of the pulse valve (13) and is sealed and connected via the connecting pipe (1), characterized in that: A second curved pipe (5) is arranged between the burner (14) and the pulse valve (13); a first curved pipe (4) is arranged between the second curved pipe (5) and the burner (14); the second curved pipe (5) and the first curved pipe (4) are distributed in a mirror image between the burner (14) and the pulse valve (13); an end of the second curved pipe (5) facing the first curved pipe (4) and an end of the first curved pipe (4) facing the second curved pipe (5) are sealedly connected via a connecting pipe (1).

2. A device for protecting a gas pulse valve in front of a burner according to claim 1, characterized in that: Shock absorbers (7) are provided at the lower end of the first curved pipe (4) and the upper end of the second curved pipe (5).

3. A device for protecting a gas pulse valve in front of a burner according to claim 2, characterized in that: A protection frame (2) is provided outside the two shock absorbers (7), and the inner wall of the protection frame (2) is fixedly connected to one end of the shock absorber (7) via a first connecting bolt (6).

4. A device for protecting a gas pulse valve in front of a burner according to claim 3, characterized in that: The two shock absorbers (7) are respectively provided with first clamping blocks (8) at the bending positions facing the second curved pipe (5) and the first curved pipe (4), and the outside of the first clamping blocks (8) is connected to the clamping grooves of the second curved pipe (5) and the first curved pipe (4).

5. A device for protecting a gas pulse valve in front of a burner according to claim 4, characterized in that: Second clamping blocks (9) are provided at both the front and rear ends of the middle of the protection frame (2), and the second clamping block (9) and the protection frame (2) are fixedly connected via second connecting bolts (10).

6. A device and implementation method for protecting a gas pulse valve in front of a burner according to claim 5, characterized in that: A pair of the second clamping blocks (9) are connected to the connecting pipe (1) between the first curved pipe (4) and the second curved pipe (5) through a slot.

7. A method for implementing the device for protecting the gas pulse valve in front of the burner according to claim 6, characterized in that: The following steps are involved: S1: installing a first elbow (4) and a second elbow (5) in a mirror-image arrangement between the burner (14) and the pulse valve (13); S2: A short connecting pipe (1) is used between the first curved pipe (4) and the second curved pipe (5) to connect them into an S shape, forming two sets of 180° elbow structures; S3: After the burner (14) stops working, that is, the pulse valve (13) is closed, according to the gas convection principle, that is, the density difference principle, the high-temperature flue gas stays in the two sets of 180° elbow structures during the transmission process, thereby protecting the soft sealing structure of the pulse valve (13).

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