Blast furnace pressure reducing valve group and blast furnace pressure control system

Abstract

The invention relates to the technical field of blast furnace metallurgy, in particular to a blast furnace pressure reducing valve group and a blast furnace pressure control system. The embodiment of the invention provides a blast furnace pressure reducing valve bank. The blast furnace pressure reducing valve bank comprises an inlet pipeline, an outlet pipeline, four first adjusting pipelines, four adjusting valves, a second adjusting pipeline and a self-adjusting valve. Four first adjusting pipelines and four adjusting valves, the four first adjusting pipelines are connected between the inlet pipeline and the outlet pipeline, the four first adjusting pipelines are arranged at the four corners of the rectangle respectively, and the four adjusting valves are arranged on the four first adjusting pipelines respectively; the second adjusting pipeline is connected between the inlet pipeline and the outlet pipeline, and the self-adjusting valve is arranged on the second adjusting pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace metallurgy, and in particular to a blast furnace pressure reducing valve group and a blast furnace pressure control system. Background Art

[0002] The pressure reducing valve group is a device for controlling the pressure on the top of the blast furnace. When the blast furnace stops blowing or supplies air, the butterfly valve of the pressure reducing valve group is opened and closed to control the pressure on the top of the furnace. During normal production, the unit is switched to the TRT unit to generate electricity using the residual pressure of the gas and recover electrical energy.

[0003] The blast furnace gas pressure reducing valve group is an important equipment in the gas purification and recovery system. The purified blast furnace gas usually passes through the TRT pressure difference power generation or pressure reducing valve group, and the pressure is reduced from 0.13-0.3Mpa to 10-13kpa. Only after the gas pressure is reduced can it be sent to the gas pipeline network and gas cabinet for storage and standby. However, the blast furnace gas pressure reducing valve group is prone to strong vibration during the pressure reduction process, which will reduce the life of the equipment and may even cause pipeline cracks and major safety accidents. Summary of the invention

[0004] The present application provides a blast furnace pressure reducing valve group and a blast furnace pressure control system, which improve the technical problem in the related art that the blast furnace gas pressure reducing valve group is prone to generate strong vibration during the pressure reduction process.

[0005] In a first aspect, an embodiment of the present application provides a blast furnace pressure reducing valve group, the pressure reducing valve group comprising:

[0006] Inlet and outlet ducts;

[0007] Four first regulating pipes and four regulating valves, the four first regulating pipes are connected between the inlet pipe and the outlet pipe, and the four first regulating pipes are respectively arranged at four corners of a rectangle, and the four regulating valves are respectively arranged on the four first regulating pipes;

[0008] A second regulating pipeline and a self-regulating valve, wherein the second regulating pipeline is connected between the inlet pipeline and the outlet pipeline, and the self-regulating valve is arranged on the second regulating pipeline.

[0009] In some embodiments, the second conditioning duct is disposed at the center of the rectangle.

[0010] In some embodiments, each of the first regulating pipeline and the second regulating pipeline is provided with a rectifying component.

[0011] In some embodiments, the rectifier assembly includes a rectifier tube and a plurality of rectifier plates. The rectifier tube is installed on the first regulating pipe and the second regulating pipe, and the rectifier tube is located on the outlet side of the regulating valve and the self-regulating valve. The plurality of rectifier plates are arranged at intervals in the rectifier tube, and the rectifier plate has a plurality of rectifier holes.

[0012] In some embodiments, the diameter of the rectifying holes is 8 mm to 15 mm, and the distance between two adjacent rectifying holes is 15 mm to 20 mm.

[0013] In some embodiments, the inlet pipe has a first pipe opening and a second pipe opening that are arranged opposite to each other, the second pipe opening is connected to the first regulating pipe and the second regulating pipe, and the diameter of the second pipe opening is larger than the diameter of the first pipe opening.

[0014] In some embodiments, the inlet pipe includes a first connecting section and a second connecting section that are connected, the first pipe opening is arranged at the first connecting section, the second pipe opening is arranged at the second connecting section, and the cross-sectional shape of the second connecting section is rectangular.

[0015] In some embodiments, the pressure reducing valve group also includes a diffuser, which includes a connected diffuser section and a third connecting section, the diffuser section is connected to the first regulating pipe and the second regulating pipe, the third connecting section is connected to the outlet pipe, and the cross-sectional shape of the diffuser section is rectangular.

[0016] In some embodiments, the pressure reducing valve group also includes a vibration damping assembly arranged on the inlet pipe and the diffuser, the vibration damping assembly includes an upper bracket, an elastic member and a lower bracket, the elastic member is connected between the upper bracket and the lower bracket, and the upper bracket is supported on the inlet pipe and the diffuser.

[0017] In the second aspect, an embodiment of the present application provides a blast furnace pressure control system, comprising a dust removal device, a TRT unit and the blast furnace pressure reducing valve group described above, wherein one end of the dust removal device is connected to the blast furnace, and the other end is connected to the TRT unit and the pressure reducing valve group, and the pressure reducing valve group is connected in parallel with the TRT unit.

[0018] The beneficial effects of this application are as follows:

[0019] In a blast furnace pressure reducing valve group and a blast furnace pressure control system provided by the present application, since the four first regulating pipes are respectively arranged at the four corners of a rectangle, and the four regulating valves are respectively arranged on the four first regulating pipes, that is, the four regulating valves are symmetrically and evenly arranged, when the openings of the four regulating valves are consistent, the airflow distribution through the pressure reducing valve group can be made more uniform, thereby making the airflow more stable, thereby reducing the vibration caused by the coal gas during the pressure reduction process and improving the situation of pipeline cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0021] Figure 1 A schematic structural diagram of a blast furnace pressure control system is shown.

[0022] Figure 2 Shows Figure 1 Schematic diagram of the structure of the pressure reducing valve group.

[0023] Figure 3 Shows Figure 2 AA section view.

[0024] Figure 4 Shows Figure 2 BB cross-sectional view.

[0025] Figure 5 Shows Figure 4 A partial enlarged view of .

[0026] Description of reference numerals:

[0027] 10-blast furnace pressure control system, 11-gravity dust collector, 12-cyclone dust collector, 13-dry dust collector, 14-inlet butterfly valve, 15-first gate valve, 16-quick cut valve, 17-turbine, 18-generator, 19-second gate valve, 20-outlet butterfly valve, 21-cleaning tower, 22-first U-shaped water seal device, 23-cut-off valve, 24-gas pipeline, 25-regulating butterfly valve, 26-regulating valve, 27-second U-shaped water seal device, 28-venting tower, 30-blast furnace body, 31-rising pipe, 32-down pipe, 33-bypass valve group, 100-pressure reducing valve group, 110-inlet pipeline, 111- First pipe opening, 112-second pipe opening, 113-first connecting section, 114-second connecting section, 120-outlet pipe, 121-control butterfly valve, 130-first regulating pipe, 131-regulating valve, 140-second regulating pipe, 141-self-regulating valve, 150-diffuser, 151-diffuser section, 152-third connecting section, 153-diffuser, 154-diffuser gate, 155-muffler, 160-rectifier assembly, 161-rectifier pipe, 162-rectifier plate, 163-rectifier hole, 170-vibration damping assembly, 171-upper bracket, 172-elastic member, 173-lower bracket, 173-support plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] See also Figure 1-Figure 3 The embodiment of the present application provides a blast furnace pressure reducing valve group 100, including an inlet pipe 110, an outlet pipe 120, four first regulating pipes 130, four regulating valves 131, a second regulating pipe 140 and a self-regulating valve 141. The four first regulating pipes 130 and the four regulating valves 131, the four first regulating pipes 130 are connected between the inlet pipe 110 and the outlet pipe 120, and the four first regulating pipes 130 are respectively arranged at the four corners of a rectangle, and the four regulating valves 131 are respectively arranged on the four first regulating pipes 130; the second regulating pipe 140 is connected between the inlet pipe 110 and the outlet pipe 120, and the self-regulating valve 141 is arranged on the second regulating pipe 140.

[0033] During the blast furnace smelting process, a by-product - blast furnace gas - is produced on the top of the blast furnace. The blast furnace gas is filtered through a dust removal device to obtain clean gas. The residual pressure generator group 18 is connected in parallel with the blast furnace pressure reducing valve group 100. During normal operation, the blast furnace gas is converted into electrical energy through the TRT residual pressure generator group 18, and the low-pressure gas is transported to the main network. When the TRT unit is shut down for maintenance, the blast furnace gas is reduced in pressure and cooled through the pressure reducing valve group 100 and then enters the low-pressure gas main network.

[0034] The inlet pipe 110 is connected to the dust removal device, and the outlet pipe 120 is connected to the low-pressure gas main network. When the TRT unit is shut down for maintenance, the gas enters the first regulating pipe 130 and the second regulating pipe 140 through the inlet pipe 110, and is reduced in pressure through the regulating valve 131 and the self-regulating valve 141. The reduced-pressure gas enters the low-pressure gas main network through the outlet pipe 120.

[0035] The four first regulating pipes 130 are arranged at the four corners of the rectangle, that is, the centers of the four first regulating pipes 130 are connected to form a rectangle. In this way, the four first regulating pipes 130 are symmetrically arranged and evenly distributed. Since each first regulating pipe 130 is provided with a regulating valve 131, the four regulating valves 131 are also symmetrically and evenly distributed.

[0036] In the pressure reducing valve group 100, the regulating valve 131 and the self-regulating valve 141 are used in combination, and the regulating valve 131 is the main one and the self-regulating valve 141 is the auxiliary one. The regulating valve 131 can accurately adjust the pressure manually or through the control system to meet the process requirements. The openings of multiple regulating valves 131 are consistent, and the openings will not change after they are set; the self-regulating valve 141 can automatically adjust according to the pressure change to maintain the set pressure value, so the opening of the self-regulating valve 141 is in a changing state. Specifically, the self-regulating valve 141 can be pneumatically controlled, electrically connected to the blast furnace top pressure, and automatically open or close according to the set top pressure.

[0037] Uneven airflow is prone to turbulence, which can cause vibration. In the embodiment of the present application, since the four regulating valves 131 are symmetrically and evenly arranged, when the openings of the four regulating valves 131 are consistent, the airflow distribution through the pressure reducing valve group 100 can be more uniform, thereby making the airflow more stable, thereby reducing the vibration caused by the gas during the pressure reduction process and improving the situation of pipeline cracking.

[0038] Specifically, the regulating valve 131 may be a DN800 regulating valve 131 , and the self-regulating valve 141 may be a DN580 self-regulating valve 141 .

[0039] In some embodiments, the second conditioning duct 140 is disposed at the center of the rectangle.

[0040] That is, the centers of the four first regulating pipes 130 are connected to form a rectangle, and the second regulating pipe 140 is arranged at the center of the rectangle. In other words, the self-regulating valve 141 is arranged at the center of the rectangle, that is, the distance between the self-regulating valve 141 and each regulating valve 131 is consistent, so that the airflow distribution can be further more uniform, thereby making the airflow more stable.

[0041] Furthermore, the center of the rectangle may coincide with the central axis of the inlet pipe 110, that is, the second regulating pipe 140 is located on the central axis of the inlet pipe 110. The self-regulating valve 141 is mainly used to fine-tune the furnace top pressure. The airflow in the middle part of the pipe has a relatively small effect on the pipeline vibration, so the self-regulating valve 141 can be used for adjustment.

[0042] See also Figure 1 and Figure 4 In some embodiments, each of the first regulating pipe 130 and the second regulating pipe 140 is provided with a rectifying assembly 160 .

[0043] In order to ensure the uniformity and stability of gas flow, improve the efficiency of gas flow, and reduce energy loss, the gas needs to be rectified after passing through the regulating valve 131 and the self-regulating valve 141. In the related art, the pressure reducing valve group 100 also includes a diffuser 150, one end of which is connected to the first regulating pipeline 130 and the second regulating pipeline 140, and the other end is connected to the outlet pipeline 120. An inverted cone-shaped rectifier is provided in the diffuser 150. After the multiple airflows coming out of the regulating pipeline enter the diffuser 150, they are mixed together and rectified by the rectifier. However, in the diffuser 150, the high-pressure and high-speed airflows blown out from the outlets of each regulating valve 131 and the self-regulating valve 141 are blown onto the rectifier, which easily forms a vortex, and the diameter of the diffuser 150 is large, so the vortex formed will be larger, resulting in greater vibration.

[0044] It should be noted that in the vibration of the pipeline described herein, the pipeline mainly refers to the inlet pipeline 110 and the diffuser 150. And because the pipe openings of the inlet pipeline 110 and the diffuser 150 need to be connected to the plurality of first regulating pipelines 130 and second regulating pipelines 140, the inlet pipeline 110 and the diffuser 150 are both end-capped pipelines.

[0045] Therefore, in the present application, a rectifying assembly 160 is independently arranged on each of the first regulating pipe 130 and the second regulating pipe 140. The gas in the first regulating pipe 130 and the second regulating pipe 140 is rectified by the rectifying assembly 160 and then merged into the diffuser 150. That is, the gas in the first regulating pipe 130 and the second regulating pipe 140 enters the diffuser 150 together after rectification. Since the rectified airflow is more uniform and stable, the formation of vortices can be reduced and the vibration condition can be improved.

[0046] See also Figure 4 and Figure 5 In some embodiments, the rectifier assembly 160 includes a rectifier tube 161 and a plurality of rectifier plates 162. The rectifier tube 161 is installed on the first regulating pipeline 130 and the second regulating pipeline 140, and the rectifier tube 161 is located on the outlet side of the regulating valve 131 and the self-regulating valve 141. The plurality of rectifier plates 162 are arranged at intervals in the rectifier tube 161, and the rectifier plates 162 have a plurality of rectifier holes 163.

[0047] Next, the rectifier tube 161 installed in the first regulating pipeline 130 is described, and the second regulating pipeline 140 is similar. The rectifier tube 161 is installed on the first regulating pipeline 130, that is, both ends of the rectifier tube 161 are connected to the first regulating pipeline 130, and the rectifier tube 161 can be connected to the first regulating pipeline 130 through a flange for easy replacement.

[0048] The rectifier tube 161 is located at the outlet side of the regulating valve 131, that is, the rectifier tube 161 is located between the regulating valve 131 and the diffuser 150, so that the gas flowing out of the outlet of the regulating valve 131 can enter the diffuser 150 after being rectified by the rectifier assembly 160. A plurality of rectifier plates 162 are arranged in the rectifier tube 161 at intervals along the flow direction of the gas, so after the gas enters the rectifier tube 161, it will pass through each rectifier plate 162 in turn. Since the rectifier plate 162 has a plurality of rectifier holes 163, the gas flow can be gradually dispersed to reduce the formation of turbulence, and the plurality of rectifier holes 163 can also reduce the flow rate of the gas, to a certain extent avoid the formation of turbulence, and improve the vibration.

[0049] Specifically, the aperture of the rectifying hole 163 may be 8 mm to 15 mm, and the spacing between two adjacent rectifying holes 163 may be 15 mm to 20 mm. After the top pressure and air volume of the blast furnace are increased, the aperture of the rectifying hole 163 may be increased accordingly.

[0050] See also Figure 2 In some embodiments, the inlet pipe 110 has a first pipe opening 111 and a second pipe opening 112 that are arranged opposite to each other, the second pipe opening 112 is connected to the first regulating pipe 130 and the second regulating pipe 140, and the diameter of the second pipe opening 112 is greater than the diameter of the first pipe opening 111.

[0051] Since the diameter of the second pipe opening 112 is larger than that of the first pipe opening 111, that is, the pipe diameter will increase when the gas flows from the first pipe opening 111 to the second pipe opening 112, thereby reducing the flow rate of the gas, allowing the gas to enter the regulating valve 131 and the self-regulating valve 141 at a lower flow rate, thereby reducing the vibration of the pipeline.

[0052] Specifically, the inlet pipe 110 includes a first connecting section 113 and a second connecting section 114 connected to each other. The first pipe opening 111 is arranged at the first connecting section 113 , and the second pipe opening 112 is arranged at the second connecting section 114 . The cross-sectional shape of the second connecting section 114 is rectangular.

[0053] Since the cross-sectional shape of the second connecting section 114 is rectangular, that is, the diameter of the second connecting section 114 does not change, while the diameter of the first connecting section 113 increases from small to large, the gas flow rate is reduced in the first connecting section 113. After the gas flow rate is reduced in the first connecting section 113, it is buffered and maintained at a low flow rate in the second connecting section 114, so that the gas flow rate is more stable, ensuring that the gas flow rate entering the regulating valve 131 and the self-regulating valve 141 is low. Specifically, the first connecting section 113 can be trumpet-shaped, that is, the diameter of the first connecting section 113 gradually increases from small to large.

[0054] See also Figure 2 In some embodiments, the diffuser 150 includes a diffuser section 151 and a third connecting section 152 connected to each other. The diffuser section 151 is connected to the first regulating pipe 130 and the second regulating pipe 140. The third connecting section 152 is connected to the outlet pipe 120. The cross-sectional shape of the diffuser section 151 is rectangular.

[0055] In the related art, the diffuser 150 has a trumpet-shaped structure, and the energy of the gas cannot be released at the reduced diameter of the diffuser 150, which easily forms turbulence and causes pipeline vibration. In the embodiment of the present application, since the cross-sectional shape of the diffuser section 151 is rectangular, that is, the diffuser section 151 is cylindrical, it can avoid the blast furnace gas from surging at the reduced diameter to a certain extent, thereby reducing the vibration of the pipeline.

[0056] The diffuser 150 is also provided with a muffler 155 to reduce noise. The diffuser 150 is also connected with a venting pipe 153 and a venting gate 154. The inlet pipe 110 and the outlet pipe 120 are both provided with a control butterfly valve 121. When the pressure reducing valve group 100 fails, the control butterfly valve 121 can be closed online.

[0057] See also Figure 2 and Figure 4 In some embodiments, the pressure reducing valve group 100 also includes a vibration damping assembly 170 arranged on the inlet pipe 110 and the diffuser 150, and the vibration damping assembly 170 includes an upper bracket 171, an elastic member 172 and a lower bracket 173, the elastic member 172 is connected between the upper bracket 171 and the lower bracket 173, and the upper bracket 171 is supported on the inlet pipe 110 and the diffuser 150.

[0058] The inlet pipe 110 and the diffuser 150 may be provided with a vibration reduction assembly 170, and two adjacent vibration reduction assemblies 170 may be provided at intervals, and the number of vibration reduction assemblies 170 is not limited. The vibration reduction assembly 170 is provided vertically to the inlet pipe 110 and the diffuser 150, and the lower bracket 173 may be provided on the ground. Since the pipe is supported by elastic force in the vertical direction, the vibration energy of the pipe can be effectively absorbed, thereby achieving the purpose of reducing the vibration of the pipe. Specifically, the elastic member 172 may be a spring.

[0059] Since the outer surfaces of the inlet pipe 110 and the diffuser 150 are arc-shaped, in order to increase the contact area between the upper bracket 171 and the pipe and improve the supporting effect of the vibration reduction assembly 170 on the pipe, so that the elastic member 172 can better absorb the vibration energy of the pipe, the upper bracket 171 may include an arc-shaped support plate 173, and the support plate 173 fits with the outer surface of the pipe, so that the support of the pipe by the vibration reduction assembly 170 is more stable.

[0060] Based on the same inventive concept, please refer to Figure 1 The embodiment of the present application also provides a blast furnace pressure control system 10, including a dust removal device, a TRT unit and the blast furnace pressure reducing valve group 100 mentioned above, one end of the dust removal device is connected to the blast furnace, and the other end is connected to the TRT unit and the pressure reducing valve group 100, and the pressure reducing valve group 100 is connected in parallel with the TRT unit.

[0061] During the blast furnace smelting process, a byproduct, blast furnace gas, is produced at the top of the blast furnace. The blast furnace gas is filtered through a dust removal device to obtain clean gas from the dust in the raw gas. The residual pressure generator 18 group is connected in parallel with the blast furnace pressure reducing valve group 100. During normal operation, the blast furnace gas is converted into electrical energy through the TRT residual pressure generator 18 group to convert the residual pressure and residual heat of the gas into electrical energy, and the low-pressure gas is transported to the main network. When the TRT unit is shut down for maintenance, the blast furnace gas is decompressed and cooled through the pressure reducing valve group 100 and then enters the low-pressure gas main network. Specifically, the dust removal device includes a gravity dust collector 11, a cyclone dust collector 12 and a dry dust collector 13, and the TRT unit includes a turbine 17 and a generator 18.

[0062] The operation process of blast furnace gas in normal production is: blast furnace body 30 - riser 31 - downcomer 32 - gravity dust collector 11 - cyclone dust collector 12 - multiple groups of dry dust collectors 13 - inlet butterfly valve 14 - first gate valve 15 - quick cut valve 16 - turbine 17 (driving generator 18) - second gate valve 19 - outlet butterfly valve 20 - cleaning tower 21 - first U-shaped water seal device 22 - cut-off valve 23 - clean gas enters gas pipe network 24. If the pipe network gas pressure exceeds 0.13 kg, the operation process of blast furnace gas is: cleaning tower 21 - regulating butterfly valve 25 - regulating valve 131 door 26 - second U-shaped water seal device 27 - discharge tower 28 for ignition and discharge.

[0063] When the TRT pressure difference power generation fails or the blast furnace is shut down, the operation process of blast furnace gas is: blast furnace body 30 - riser 31 - downcomer 32 - gravity dust collector 11 - cyclone dust collector 12 - multiple groups of dry dust collectors 13 - pressure reducing valve group 100 - cleaning tower 21 - first U-shaped water seal device 22 - shut-off valve 23 - clean gas enters the gas pipeline network 24.

[0064] Next, the usage of the pressure reducing valve group 100 is introduced:

[0065] When the blast furnace stops blowing or the TRT fails, the pressure relief valve group 100 is required to control the furnace top pressure. First, ensure that the TRT and the blast furnace have the switching conditions (top pressure is greater than 1.5kg / cm2), and the pressure relief valve group 100 is checked to be normal. Select two symmetrical regulating valves 131 to open to the appropriate opening, and after receiving the TRT instruction, turn the self-regulating valve 141 to the "automatic" state. During the conversion process, due to the large fluctuation of the top pressure, the opening of the regulating valve 131 can be appropriately reduced. Observe whether the self-regulating valve 141 is normal, and the TRT turbine 17 closes the stationary blade angle to ensure the stability of the top pressure. When the TRT switches to the pressure relief valve group 100, the regulating valve 131 is opened first. When the pressure relief valve group 100 switches to the TRT, the TRT turbine 17 gradually opens the stationary blade angle, and then closes the regulating valve 131 of the pressure relief valve group 100 in turn. The conversion operation of TRT to the pressure relief valve group 100 is completed, and the blast furnace sends a "valve group controls top pressure" signal to the TRT to complete the conversion of the TRT to the pressure relief valve group 100. When the conversion operation of the pressure reducing valve group 100 to TRT is completed, after TRT sends "TRT controls top pressure" to the blast furnace, the self-regulating valve 141 is gradually closed manually. When a serious fault occurs in the TRT and it is shut down urgently, the two bypass valve groups 33 are automatically opened, and the TRT sends a "TRT serious fault signal" to the blast furnace and then proceeds according to the previous operation. When an emergency occurs in the blast furnace, the blast furnace operator sends a "blast furnace serious fault" signal to the TRT, and then operates. After the conversion is completed, observe whether the top pressure and air volume match properly during the air supply stop process. If the top pressure is adjusted too slowly or the behavior is slightly sluggish, open other regulating valves 131 and contact the TRT to adjust the stator blade angle to ensure the smooth operation of the blast furnace.

[0066] It should be noted that there is currently no standard for the vibration value of the pressure reducing valve group 100 in the industry. Through long-term vibration measurement and research, it is found that the displacement value detected by the vibration meter is less than or equal to 1mm and is within the normal range.

[0067] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A blast furnace pressure reducing valve group, characterized in that: The pressure reducing valve group comprises: Inlet and outlet ducts; Four first regulating pipes and four regulating valves, the four first regulating pipes are connected between the inlet pipe and the outlet pipe, and the four first regulating pipes are respectively arranged at four corners of a rectangle, and the four regulating valves are respectively arranged on the four first regulating pipes; A second regulating pipeline and a self-regulating valve, wherein the second regulating pipeline is connected between the inlet pipeline and the outlet pipeline, and the self-regulating valve is arranged on the second regulating pipeline.

2. The blast furnace pressure reducing valve group according to claim 1, characterized in that: The second regulating duct is arranged at the center of the rectangle.

3. The blast furnace pressure reducing valve group according to claim 1, characterized in that: Each of the first regulating pipeline and the second regulating pipeline is provided with a rectifying component.

4. The blast furnace pressure reducing valve assembly according to claim 3, characterized in that: The rectifier assembly includes a rectifier tube and a plurality of rectifier plates. The rectifier tube is installed on the first regulating pipeline and the second regulating pipeline, and the rectifier tube is located on the outlet side of the regulating valve and the self-regulating valve. The plurality of rectifier plates are arranged at intervals in the rectifier tube, and the rectifier plate has a plurality of rectifier holes.

5. The blast furnace pressure reducing valve assembly according to claim 4, characterized in that: The diameter of the rectifying holes is 8 mm to 15 mm, and the distance between two adjacent rectifying holes is 15 mm to 20 mm.

6. The blast furnace pressure reducing valve assembly according to claim 1, characterized in that: The inlet pipe has a first pipe opening and a second pipe opening which are arranged opposite to each other, the second pipe opening is connected to the first regulating pipe and the second regulating pipe, and the diameter of the second pipe opening is larger than the diameter of the first pipe opening.

7. The blast furnace pressure reducing valve assembly according to claim 6, characterized in that: The inlet pipe comprises a first connecting section and a second connecting section which are connected to each other. The first pipe opening is arranged at the first connecting section, the second pipe opening is arranged at the second connecting section, and the cross-sectional shape of the second connecting section is a rectangle.

8. The blast furnace pressure reducing valve assembly according to claim 1, characterized in that: The pressure reducing valve group also includes a diffuser, which includes a diffuser section and a third connecting section connected to each other. The diffuser section is connected to the first regulating pipeline and the second regulating pipeline, and the third connecting section is connected to the outlet pipeline. The cross-sectional shape of the diffuser section is rectangular.

9. The blast furnace pressure reducing valve assembly according to claim 8, characterized in that: The pressure reducing valve group also includes a vibration damping assembly arranged on the inlet pipe and the diffuser, the vibration damping assembly includes an upper bracket, an elastic member and a lower bracket, the elastic member is connected between the upper bracket and the lower bracket, and the upper bracket is supported by the inlet pipe and the diffuser.

10. A blast furnace pressure control system, characterized in that: It comprises a dust removal device, a TRT unit and a blast furnace pressure reducing valve group as described in any one of claims 1 to 9, wherein one end of the dust removal device is connected to the blast furnace, and the other end is connected to the TRT unit and the pressure reducing valve group, and the pressure reducing valve group is connected in parallel with the TRT unit.

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