CN213232355U - Smelting reduction furnace flue process monitoring and maintaining system - Google Patents

Abstract

The utility model provides a melting reduction furnace flue technology control and maintenance system, its vaporization flue include swing joint's first straight tube section, second bend section and third straight tube section in proper order, and each pipeline section swing joint makes things convenient for the maintenance of vaporization flue, and easy operation is convenient. The pressure monitoring and blockage removing device comprises a first sub-pressure monitoring and blockage removing device arranged at an inlet of the first straight pipe section, a second sub-pressure monitoring and blockage removing device arranged at an outlet of the first straight pipe section, and a third sub-pressure monitoring and blockage removing device arranged at an outlet of the third straight pipe section. The pressure ports of getting that three interval arranged are located the entrance of first straight tube section, the exit of first straight tube section and the exit of third straight tube section respectively, compare in prior art, and the waste flue gas in whole vaporization flue can be covered to clear, the distribution is even and clear definitely in the three pressure port position of getting of this application for the pressure value of system monitoring is accurate, stable, improves entire system's controllability.

Description

Smelting reduction furnace flue process monitoring and maintaining system

Technical Field

The utility model relates to an iron-making technical field, concretely relates to melting reduction furnace flue technology control and maintenance system.

Background

The smelting reduction iron-making technology is an advanced metallurgical technology in the domestic metallurgical industry, utilizes non-coking coal powder and iron ore powder to produce liquid pig iron by adopting a jet metallurgy mode, has short flow, little pollution and good molten iron quality, and is an advanced iron-making technology for solving the problems of limited coking coal resources and environmental protection in China.

The core of the smelting reduction steelmaking technology is an SRV smelting reduction furnace, and the molten iron discharging mode of the smelting reduction furnace is that molten iron is pressed out of a front-mounted furnace by utilizing the principle of a communicating vessel through pressurization in the furnace. If the furnace pressure is out of control during normal production, molten iron overflows from the front furnace, and major production accidents are easily caused.

Need carry out real-time supervision to the stove pressure in process of production, the rationality of its position and sample of getting the pressure mouth is crucial, and when the stove pressure of monitoring reached the pressure value that the system set for, system automatic control opened safe pressure relief device, guarantees to realize the quick diffusion of stove internal pressure within 3 seconds. In the prior art, a system for monitoring and controlling the pressure of the smelting reduction furnace exists, but the position of a pressure taking port is not determined.

In addition, the pressure monitoring and control system of the smelting reduction furnace in the prior art needs to manually judge whether the pressure measuring pipeline is blocked or not, and then the blockage clearing device is started, so that the blockage clearing effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a smelting reduction furnace flue process monitoring and maintenance system to solve at least one among the above-mentioned technical problem.

The utility model discloses the technical scheme who adopts does:

a smelting reduction furnace flue process monitoring and maintenance system comprises a smelting reduction furnace and a flue system connected with the smelting reduction furnace, wherein the flue system comprises:

the vaporization flue comprises a first straight pipe section, a second bend pipe section and a third straight pipe section, wherein an outlet of the first straight pipe section is movably connected with an inlet of the second bend pipe section, and an outlet of the second bend pipe section is movably connected with an inlet of the third straight pipe section; and

the pressure monitoring and blockage clearing device comprises a first sub-pressure monitoring and blockage clearing device, a second sub-pressure monitoring and blockage clearing device and a third sub-pressure monitoring and blockage clearing device, wherein the first sub-pressure monitoring and blockage clearing device is arranged at an inlet of the first straight pipe section, the second sub-pressure monitoring and blockage clearing device is arranged at an outlet of the first straight pipe section, and the third sub-pressure monitoring and blockage clearing device is arranged at an outlet of the third straight pipe section.

Each sub-pressure monitoring and clear stifled device is including being located pressure transmitter and the trip valve on the pressure pipeline, the trip valve is located be close to on the pressure pipeline the one end of vaporization flue.

Each sub-pressure monitoring and blockage removing device further comprises a back-blowing pipeline connected to the pressure sampling pipeline, and the back-blowing pipeline is provided with a back-blowing control valve.

The flue system still includes safe diffusing device, safe diffusing device set up in the highest position department of second bend section, safe diffusing device includes first relief valve and second relief valve, first relief valve is located and is close to entry one side of second bend section, the second relief valve is located and is close to export one side of second bend section.

Each pressure release valve comprises a valve body and a valve cover covering the valve body, a fireproof lining layer is arranged on the inner side of the valve body, a water cooling plate is arranged on the outer side of the valve body, and a cavity is formed between the water cooling plate and the valve body so as to allow circulating water to enter.

The valve cover is of a double-shell structure so as to form a channel for introducing cooling water.

The pressure release valve is provided with a hydraulic driving device, and the hydraulic driving device can automatically control the valve cover to open or close the pressure release valve according to a preset pressure value.

The valve cover is provided with an extension spring, and the extension spring can mechanically control the valve cover to open or close the pressure release valve according to a pressure preset value.

The preset pressure value is N, wherein N is more than or equal to 100Kpa and less than or equal to 120 Kpa.

The flue system also comprises an operating system, and the operating system comprises a safety PLC system and a DCS system which are in communication connection, so that the automatic control of the control system is realized.

Since the technical scheme is used, the utility model discloses the beneficial effect who gains does:

1. the utility model discloses in, the vaporization flue includes swing joint's first straight tube section, second bend section and third straight tube section in proper order, and each pipeline section swing joint makes things convenient for the maintenance of vaporization flue, when certain section flue breaks down and need overhaul, only need dismantle the flange at this section both ends can, easy operation is convenient. The pressure ports of getting that three interval arranged are located the entrance of first straight tube section, the exit of first straight tube section and the exit of third straight tube section respectively, compare in prior art, and the waste flue gas in whole vaporization flue can be covered to clear, the distribution is even and clear definitely in the three pressure port position of getting of this application for the pressure value of system monitoring is accurate, stable, improves entire system's controllability.

2. Furthermore, each sub-pressure detection monitoring and blockage clearing device comprises a pressure transmitter and a stop valve, and the pressure transmitter and the stop valve are both positioned on the pressure taking pipeline, so that the pressure detection of the vaporization flue is ensured, and the normal operation of production is not influenced. The trip valve sets up the one end that is close to the vaporization flue on the pressure pipeline, conveniently controls the break-make of pressure pipeline. When the pressure transmitter breaks down and needs to be replaced, the stop valve can be closed for replacement, the SRV furnace does not need to be in a damping-down state, maintenance time is saved, and production efficiency is effectively improved.

3. Furthermore, the pressure taking pipeline is connected with a back-blowing pipeline, a back-blowing valve is arranged on the back-blowing pipeline, the back-blowing valve is opened when the blockage removing action is carried out, and the blockage removing device is matched to quickly and timely remove the blockage. The system automatically detects the blocking condition of each pressure taking port through a logic control program, automatically enters a blocking clearing sequential control program to clear the blocking, and does not need to manually judge whether the pressure taking port is blocked and then open the blocking clearing.

4. Furthermore, the safety diffusing device is arranged at the highest position of the U-shaped elbow of the second bend section of the vaporization flue, and the flue gas at the highest position of the flue has smaller flow resistance, so that the rapid pressure regulation and control of the vaporization flue are facilitated. The safety diffusing device comprises two sets of pressure release valves, wherein the first pressure release valve is positioned in front of the second pressure release valve, so that the two sets of pressure release valves are uniformly dispersed at the highest position of the U-shaped elbow of the second elbow section, the pressure release of the vaporization flue is more uniform, and the influence of sudden pressure change on the system when the pressure release valves are assembled in a centralized manner is avoided.

5. Further, the valve body inboard of relief valve is provided with refractory lining for the valve body has higher high temperature resistance, avoids the high temperature flue gas to cause the harm to the valve body, improves the life of relief valve. The outside and the water-cooling plate of valve body form there is the cavity, can let in the circulating water in the cavity, can play the cooling effect to the valve body on the one hand, and on the other hand can carry out heat recovery to the flue gas waste heat, improves the energy utilization efficiency of system.

6. Furthermore, because the valve cover part of the pressure release valve is not protected by refractory materials and is in direct contact with waste flue gas in the vaporization flue, in order to avoid high-temperature damage to the valve cover caused by the flue gas and prolong the service life of the valve cover, circulating water is introduced into the valve cover for circulating cooling.

7. Preferably, the pressure release valves are provided with a hydraulic driving device, so that the pressure release valves have an automatic control mode, and in the automatic control mode, the DCS system sends a valve opening instruction to the safety PLC system to automatically control the opening of the two pressure release valves. The automatic opening action of the pressure release valve is controlled by the safety PLC system, and compared with a DCS system, the signal response speed of the safety PLC system is higher, the signal output is more stable, and the pressure release valve can be effectively and quickly opened within 3 seconds.

8. Preferably, the operating system in this application adopts the river DCS system to combine together with safe PLC system, through modbus communication, and system control is nimble more high-efficient.

9. Preferably, the preset value of the system pressure is set to 100Kpa N120 Kpa. The practical application of production finds that serious production accidents, out-of-control furnace conditions, serious molten iron overflow and even serious potential safety hazards occur when the detected pressure in the furnace exceeds 120 KPa. Therefore, the preset pressure value of the system is set to be equal to or less than 100Kpa and equal to or less than 120Kpa, so that the serious safety accident caused by the out-of-control of the furnace condition and the overflow of molten iron is avoided.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a schematic structural diagram of a smelting reduction furnace flue process monitoring and maintaining system provided by the present application.

Wherein: 1-a first straight pipe section, 2-a second bend pipe section, 3-a third straight pipe section, 4-a first sub-pressure monitoring and blockage removing device, 5-a second sub-pressure monitoring and blockage removing device, 6-a third sub-pressure monitoring and blockage removing device, 7-a pressure taking pipe, 8-a pressure transmitter, 9-a stop valve, 10-a back flushing pipe, 11-a back flushing control valve, 12-a first pressure relief valve, 13-a second pressure relief valve, 14-a valve body, 15-a valve cover, 16-a hydraulic driving device, 17-a circulating pump, 18-a temperature sensor, 19-a pressure sensor, 20-a manual stop valve, 21-a pneumatic stop valve and 22-a pore plate flowmeter.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In addition, in the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1, the present application provides a monitoring and maintenance system for a smelting reduction furnace flue process, which comprises a smelting reduction furnace and a flue system connected with the smelting reduction furnace, wherein the flue system comprises a vaporization flue and a pressure monitoring and blockage removal device. The vaporizing flue comprises a first straight pipe section 1, a second bend pipe section 2 and a third straight pipe section 3, wherein an outlet of the first straight pipe section 1 is movably connected with an inlet of the second bend pipe section 2, and an outlet of the second bend pipe section 2 is movably connected with an inlet of the third straight pipe section 3.

The pressure monitoring and blockage clearing device comprises a first sub-pressure monitoring and blockage clearing device 4, a second sub-pressure monitoring and blockage clearing device 5 and a third sub-pressure monitoring and blockage clearing device 6, wherein the first sub-pressure monitoring and blockage clearing device 4 is arranged at an inlet of the first straight pipe section 1, the second sub-pressure monitoring and blockage clearing device 5 is arranged at an outlet of the first straight pipe section 1, and the third sub-pressure monitoring and blockage clearing device 6 is arranged at an outlet of the third straight pipe section 3.

In the application, the vaporization flue comprises a first straight pipe section 1, a second bend pipe section 2 and a third straight pipe section 3 which are movably connected in sequence, and the pipe sections are movably connected to facilitate the overhaul and maintenance of the vaporization flue. Specifically, can adopt the flange with each pipeline section swing joint, when certain section flue breaks down and need overhaul, only need dismantle the flange at this section both ends can, easy operation is convenient.

This application sets up the pressure mouth of getting of three interval arrangement, be located the entrance of first straight tube section 1 respectively, the exit of first straight tube section 1 and the exit of third straight tube section 3, the three pressure mouth of getting sets gradually first sub-pressure monitoring and clear stifled device 4, the sub-pressure monitoring of second and clear stifled device 5 and the sub-pressure monitoring of third and clear stifled device 6, compare in prior art, the three pressure mouth position of getting of this application is clear and definite clear, distribute evenly and can cover the exhaust fume in the whole vaporization flue, make the pressure value of system monitoring accurate, stable, improve entire system's controllability.

The blockage clearing device in the application is characterized in that a push rod is driven to act by an air cylinder executing mechanism, a two-position three-way pneumatic reversing valve acts on an air cylinder to drive the push rod to stretch out and contract, 24VDC proximity switches are arranged at two ends of the air cylinder respectively to detect whether the action of the push rod is in place or not, the stroke of the push rod is 800 plus 1000mm, and the action stroke of the blockage clearing device can be adjusted by adjusting different positions of the proximity switches on the air cylinder.

Further, the flue system also comprises an operating system, and the operating system comprises a safety PLC system and a DCS system which are in communication connection, so that the automatic control of the control system is realized.

Three sub-pressure monitoring and clear stifled device in this application install monitoring SRV stove furnace pressure on the vaporization flue, through cross river DCS system program automatic selection go out the pressure value that is closest SRV stove furnace pressure reality, when detection pressure reaches the system setting value, communicate through modus between cross river DCS system and the safe PLC, safety PLC control system opens pressure relief device fast, directly release the waste flue gas in the vaporization flue to the atmosphere, realize the quick pressure release of SRV stove, avoid in the stove molten iron and iron slag to spill over through leading stove, guarantee the normal operating of production. Operating system in this application adopts the river DCS system and combines together with safe PLC system, through modbus communication, and system control is nimble more high-efficient.

Furthermore, each sub-pressure monitoring and blockage removing device comprises a pressure transmitter 8 and a stop valve 9 which are positioned on the pressure taking pipeline 7, and the stop valve 9 is positioned at one end, close to the vaporization flue, of the pressure taking pipeline 7.

As shown in figure 1, the three sub-pressure monitoring and blockage removing devices in the application are basically the same in configuration, each sub-pressure monitoring and blockage removing device comprises a pressure transmitter 8 and a stop valve 9, and the pressure transmitter 8 and the stop valve 9 are both positioned on a pressure tapping pipeline 7, so that the pressure detection of the vaporization flue is ensured, and the normal operation of production is not influenced. Wherein, trip valve 9 sets up the one end that is close to the vaporization flue on pressure taking pipeline 7, conveniently controls the break-make of pressure taking pipeline 7.

In the above-mentioned scheme, pressure transmitter 8 that this application chose for use, its range is: 0-200KPa, and 4-20mA output. The pressure transmitter 8 is directly connected with the safety PLC system through a signal control line, the safety PLC system is communicated with the river crossing DCS system through the modbus, and the pressure output signal is used for compiling a logic control program in the river crossing DCS system. The trip valve 9 adopts pneumatic piston trip valve (DN25, standard pressure 1.6MPa, gas open type, 24VDC explosion-proof electromagnetic valve, hand wheel mechanism), the trip valve 9 is located on the pressure tapping connecting pipeline, when the pressure transmitter 8 breaks down and needs to be replaced, the trip valve 9 can be closed for replacement, and the SRV furnace does not need to be put into a damping-down state, thereby saving the maintenance time and effectively improving the production efficiency.

Furthermore, each sub-pressure monitoring and blockage removing device further comprises a back-blowing pipeline 10 connected to the pressure obtaining pipeline 7, and the back-blowing pipeline 10 is provided with a back-blowing control valve 11.

The pressure taking pipeline 7 is connected with a back-blowing pipeline 10, a back-blowing valve is arranged on the back-blowing pipeline 10, a back-blowing control valve 11 is the same as a cut-off valve 9, a pneumatic piston cut-off valve (DN25, standard pressure 1.6MPa, air-open type, 24VDC explosion-proof electromagnetic valve and a hand wheel mechanism are adopted, the back-blowing valve is opened when the blockage removing action is carried out, and the blockage removing device is matched to quickly and timely remove the blockage.

The whole blockage clearing device and the nitrogen back blowing are automatically controlled by a river crossing DCS system, when the deviation of the pressure value detected by a pressure transmitter 8 and the larger value of the pressure at the outlet of the first straight pipe section 1 or the pressure at the outlet of the third straight pipe section 3 exceeds 10%, the system judges that the inlet of the first straight pipe section 1 is blocked, the system automatically starts a blockage clearing and back blowing sequential control program, the blockage clearing device can automatically move back and forth for 5 times, the action interval of each time is 15 seconds, the back blowing valve is opened at the moment, and back blowing is carried out in a matched mode. If the pressure value detected by the pressure transmitter 8 is unchanged after the blockage clearing sequential control is finished, the system can automatically perform the next sequential control program action. And if the pressure value is not changed after 5 times of sequential control actions, judging that the pressure taking port is completely blocked, and manually clearing the pressure taking port by professional maintenance personnel when the SRV furnace is required to enter a damping-down state.

It can be seen from the above that pressure monitoring in this application is more high-efficient convenient with clear stifled device automated control, and the system passes through the logic control procedure, and the jam condition of each pressure tapping is detected to the automated inspection, gets into clear stifled sequential control procedure of automatic clear stifled, and need not artificial judgement pressure tapping and open clear stifled again after blockking up.

Preferably, the flue system further includes a safety diffusing device, the safety diffusing device is disposed at the highest position of the second bend section 2, the safety diffusing device includes a first pressure release valve 12 and a second pressure release valve 13, the first pressure release valve 12 is located at one side of an inlet close to the second bend section 2, and the second pressure release valve 13 is located at one side of an outlet close to the second bend section 2.

The safety diffusing device is arranged at the highest position of the U-shaped elbow of the second bend section of the vaporization flue, and the flue gas at the highest position of the flue has smaller flow resistance, so that the rapid pressure regulation and control of the vaporization flue are facilitated. The safety diffusing device comprises two sets of pressure release valves, wherein the first pressure release valve 12 is positioned in front of the second pressure release valve 13, so that the two sets of pressure release valves are uniformly dispersed at the highest position of the U-shaped elbow of the second elbow section, the pressure release of the vaporization flue is more uniform, and the influence of sudden pressure change on the system when the pressure release valves are assembled in a centralized manner is avoided.

Two sets of pressure release valves arranged in the safety diffusing device are controlled by a safety PLC system, so that the pressure release valves can be completely opened within 3 seconds, and the rapid diffusing and pressure releasing of the smoke are realized. The pressure relief valve is of a "coffee pot" (i.e. hinged lid) type design with dimensions of 865mm, a total weight of about 7,000kg and a design exhaust temperature of 1650 ℃.

Further, each relief valve include valve body 14 and lid with valve gap 15 of valve body 14, the valve body 14 inboard is provided with the refractory lining, the outside of valve body 14 is provided with the water-cooling board, the water-cooling board with be formed with the cavity between the valve body 14 to let in the circulating water.

The valve body 14 inboard of relief valve is provided with refractory lining for valve body 14 has higher high temperature resistance, avoids high temperature flue gas to cause the harm to valve body 14, improves the life of relief valve. The outside and the water-cooling plate of valve body 14 form there is the cavity, can let in the circulating water in the cavity, can play the cooling effect to valve body 14 on the one hand, and on the other hand can carry out heat recovery to the flue gas waste heat, improves the energy utilization efficiency of system.

The pressure relief valve includes a valve seat that is connected to the flue by an M42 hinge bolt. A fireproof lining layer is arranged on the inner side of a valve body 14 of the pressure release valve, and is composed of a high-temperature-resistant material and a spraying wear-resistant layer and comprises a permanent lining and a working lining, and the working lining is formed by pouring 60% of alumina. A water cooling plate is arranged on the outer side of the valve body 14, a flue circulating water system collects flue gas heat, and waste heat is recycled through a steam pocket on the top of a flue.

For the circulating water, specifically, the smelting reduction furnace flue process monitoring and maintaining system is further provided with a flue circulating water system, the flue circulating water system adopts two circulating pumps 17 for supplying water, one is used, the other is an electric pump, the rated power is 200KW, and the voltage is 415 KV; one is a diesel pump with a rated power of 200 KW. The electric pump operates normally. The diameters of a high-pressure water supply pipeline and a water supply main pipe of the circulating pump are DN400, the pipelines of the two water supply pumps are all provided with a temperature sensor 18 (with the measuring range of 0-100 ℃ and the output of 4-20mA), a pressure sensor 19 (with the measuring range of 0-10MPa and the output of 4-20mA), a manual cut-off valve 20 and a pneumatic cut-off valve 921, and the water supply main pipe is provided with a pore plate flowmeter 22 (with the measuring range of 0-1650t/h and the output of 4-20 mA).

Further, the valve cover 15 is provided in a double-shell structure to form a passage through which cooling water is introduced.

As the valve cover 15 part of the pressure release valve is not protected by refractory materials and is in direct contact with waste flue gas at the temperature of 1400 ℃ and 1650 ℃ in the vaporization flue, in order to avoid the high-temperature damage of the flue gas to the valve cover 15 and improve the service life of the valve cover 15, circulating water is introduced into the valve cover 15 for circulating cooling. Specifically, the valve cover 15 is designed as a double-shell structure to form a cooling water passage. In the using process, the circulating cooling water is continuously introduced into the valve cover 15 so as to cool the valve cover 15.

Because the pressure release valve is positioned at the highest point of the vaporization flue, the height from the ground reaches 65-70m, and high-pressure circulating water is adopted for cooling. The high-pressure circulating water system adopts two-purpose one-standby three water supply pumps to supply water for the system, the design pressure is 2-3MPa, the total flow of circulating water is 700-1500m/h, and the high-pressure circulating water system is completely used for cooling each key part of the hot air spray gun at the top of the SRV except for the valve cover 15 of the cooling pressure release valve. Install the flowmeter on the 15 cooling water return pipelines of valve gap, detect the flow of 15 cooling water of valve gap, the flowmeter adopts integral type electromagnetic flowmeter, and the pipe diameter is DN40, and the range is: 0-15t/h, 220VAC power supply and 4-20mA output.

Preferably, the pressure relief valve is provided with a hydraulic driving device 16, and the hydraulic driving device 16 can automatically control the valve cover 15 to open or close the pressure relief valve according to a preset pressure value.

The pressure release valve is provided with a hydraulic driving device 16, a three-position four-way hydraulic reversing valve is adopted to act on an oil cylinder of the hydraulic driving device 16 to control the opening or closing of the valve, and the pressure release valve is provided with a limit switch to respectively detect the in-place condition of the opening or closing of the pressure release valve. The design operating pressure value of the hydraulic drive device 16 was 105 kPa. When the SRV furnace or flue pressure reaches 105kPa, the hydraulic drive device 16 automatically controls the pressure relief valve to open.

The control of the hydraulic cylinder to open the pressure relief valve is controlled by a safety PLC, a signal output by an SRV furnace pressure transmitter is directly connected to the safety PLC through a control line, a control program of the signal output by the SRV furnace pressure transmitter is programmed on the river crossing DCS, when a set pressure value is reached, the pressure relief valve is opened, information interaction between the river crossing DCS and the safety PLC is achieved through MODBUS communication, an opening signal instruction of the pressure relief valve is that the river crossing DCS is sent to the safety PLC through MODBUS communication, and the pressure relief valve is opened under the control of the safety PLC.

The automatic opening action of the pressure release valve is controlled by the safety PLC system, and compared with a DCS system, the signal response speed of the safety PLC system is higher, the signal output is more stable, and the pressure release valve can be effectively and quickly opened within 3 seconds.

Preferably, the valve cover 15 is provided with an extension spring which can mechanically control the valve cover 15 to open or close the pressure relief valve according to a preset pressure value.

The valve cover 15 is provided with a fixed extension spring for mechanically controlling the opening of the pressure release valve, and when the pressure release valve reaches 110kPa, the pressure release valve is mechanically controlled to be opened. The pressure value of the mechanical opening pressure release valve is adjusted by adjusting the tension of the fixed spring, the pressure value can be set within the range of 90-160kPag, and the pressure release valve is ensured to be opened by the pressure of waste smoke in the hydraulic driving device 16 if the hydraulic action fails to meet the accident condition, so that the automatic pressure release of the pressure release valve is realized.

From the above, it can be seen that there are two control modes for the operation of the pressure relief valve, an automatic control mode and a manual control mode. In an automatic control mode, when the flue gas pressure of the SRV furnace is greater than 110kPa, the river crossing DCS system sends a valve opening instruction to the safety PLC system, and the two pressure release valves are automatically controlled to be opened. In the manual control mode, only when the SRV furnace is in a damping-down state, the pressure release valve can be manually opened or closed through the river DCS, and the I/O signal of the switch pressure release valve between the river DCS and the safety PLC is in hard connection. When the pressure relief valve is automatically opened, the pressure relief valve must be closed by an operator in a manual control mode through the river crossing DCS system.

Further, the preset pressure value is N, wherein N is more than or equal to 100Kpa and less than or equal to 120 Kpa.

The practical application of production finds that serious production accidents, out-of-control furnace conditions, serious molten iron overflow and even serious potential safety hazards occur when the detected pressure in the furnace exceeds 120 KPa. Therefore, the preset pressure value is set to be 100Kpa to N120 Kpa. When the pressure relief valve system fails or the hydraulic driving device 16 fails, the pressure value of the mechanical control opening valve cover 15 is set to be 110KPa, so that the serious safety accident caused by the out-of-control furnace condition and the overflow of molten iron can be avoided.

The utility model can be realized by adopting or using the prior art for reference in places which are not mentioned in the utility model.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A smelting reduction furnace flue process monitoring and maintenance system comprises a smelting reduction furnace and a flue system connected with the smelting reduction furnace, and is characterized in that the flue system comprises:

the vaporization flue comprises a first straight pipe section, a second bend pipe section and a third straight pipe section, wherein an outlet of the first straight pipe section is movably connected with an inlet of the second bend pipe section, and an outlet of the second bend pipe section is movably connected with an inlet of the third straight pipe section; and

the pressure monitoring and blockage clearing device comprises a first sub-pressure monitoring and blockage clearing device, a second sub-pressure monitoring and blockage clearing device and a third sub-pressure monitoring and blockage clearing device, wherein the first sub-pressure monitoring and blockage clearing device is arranged at an inlet of the first straight pipe section, the second sub-pressure monitoring and blockage clearing device is arranged at an outlet of the first straight pipe section, and the third sub-pressure monitoring and blockage clearing device is arranged at an outlet of the third straight pipe section.

2. The smelt reduction furnace flue process monitoring and maintenance system according to claim 1, wherein each of said sub-pressure monitoring and block clearing devices includes a pressure transmitter and a shut-off valve located on a pressure tapping pipe, said shut-off valve being located on an end of said pressure tapping pipe near said vaporization flue.

3. The monitoring and maintaining system for the smelting reduction furnace flue process according to claim 2, wherein each sub-pressure monitoring and block-removing device further comprises a blowback pipe connected to the pressure-taking pipe, and the blowback pipe is provided with a blowback control valve.

4. The monitoring and maintaining system for the flue process of the smelting reduction furnace according to claim 1, wherein the flue system further comprises a safety diffusing device, the safety diffusing device is arranged at the highest position of the second bend section, the safety diffusing device comprises a first pressure relief valve and a second pressure relief valve, the first pressure relief valve is positioned at one side close to the inlet of the second bend section, and the second pressure relief valve is positioned at one side close to the outlet of the second bend section.

5. The smelting reduction furnace flue process monitoring and maintaining system according to claim 4, wherein each pressure release valve comprises a valve body and a valve cover covering the valve body, a refractory lining is arranged on the inner side of the valve body, a water cooling plate is arranged on the outer side of the valve body, and a cavity is formed between the water cooling plate and the valve body to allow circulating water to enter.

6. The system of claim 5, wherein the valve cover is configured in a double-shell configuration to form a cooling water passage.

7. The system for monitoring and maintaining the flue process of the smelting reduction furnace according to claim 5, wherein the pressure release valve is provided with a hydraulic driving device, and the hydraulic driving device can automatically control the valve cover to open or close the pressure release valve according to a preset pressure value.

8. The system for monitoring and maintaining the flue process of the smelting reduction furnace according to claim 7, wherein the valve cover is provided with an extension spring, and the extension spring can mechanically control the valve cover to open or close the pressure relief valve according to a preset pressure value.

9. The system of claim 7 or 8, wherein the predetermined pressure value is N, wherein 85Kpa is less than or equal to N is less than or equal to 120 Kpa.

10. The monitoring and maintenance system of a smelting reduction furnace flue process of claim 1, wherein the flue system further comprises an operating system, the operating system comprises a safety PLC system and a DCS system which are in communication connection to achieve automatic control of the flue system.

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