CN220665360U

CN220665360U - Furnace top low-temperature nitrogen system

Info

Publication number: CN220665360U
Application number: CN202322290799.XU
Authority: CN
Inventors: 同国庆; 白治慧
Original assignee: Sinosteel Xian Machinery Co Ltd
Current assignee: Sinosteel Xian Machinery Co Ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2024-03-26
Anticipated expiration: 2033-08-24

Abstract

The utility model belongs to the field of metallurgical machinery, and relates to a furnace top low-temperature nitrogen system, which comprises a main pipeline for providing nitrogen for furnace top equipment, wherein the main pipeline is divided into two branches at a node A for air supply: the air source of the first branch cools the gear box through the flow regulating device, and the air source of the second branch cools the valve box through the flow regulating device and seals the top of the gear box; the first branch is also connected with a control system and a refrigerator for cooling nitrogen, and the refrigerator is connected with the control system. According to the utility model, the nitrogen is cooled by the refrigerator, so that the heat taken away by nitrogen cooling is increased, and the cooling efficiency is improved; the control system can carry out closed-loop control on the flow and the temperature of the cooling nitrogen, so that the automation degree and the control precision of the whole system are improved; through the mutual cooperation of the two, the working temperature of furnace top equipment is reduced, the stability of temperature control is improved, the working environment of the equipment is improved, faults are reduced, and the service life is prolonged.

Description

Furnace top low-temperature nitrogen system

Technical Field

The utility model belongs to the field of metallurgical machinery, and relates to a furnace top low-temperature nitrogen system.

Background

The blast furnace top burden distribution adopts gear box equipment, wherein a furnace top nitrogen control system is generally configured, and the functions of the system are two aspects: firstly, the rotating part of the gear box is sealed, so that dust is prevented from entering the gear box to cause blocking of the gear box, and the burden distribution of the blast furnace is prevented from being influenced; secondly, cool down gear box equipment, prevent that the high temperature in the smelting process from getting into the gear box and leading to damaging, improve the life of equipment.

At present, a furnace top nitrogen system commonly adopted in the market is a normal-temperature nitrogen system, only nitrogen is introduced into furnace top equipment, the nitrogen temperature control function is not commonly provided, and the cooling effect is poor. A main air inlet pipeline of a conventional furnace top nitrogen system is divided into three paths of inlet equipment: one path of the air enters a valve box for cooling; one path enters the top of the gear box for sealing; one path enters the middle part of the gear box for cooling. The furnace top nitrogen system consists of a gas tank, a regulating valve, a check valve, a temperature transmitter, a pressure transmitter, a flowmeter, a butterfly valve, a fan, a butterfly valve, a ball valve, a butterfly valve, a gear box, a valve box and the like.

The existing furnace top nitrogen system has the following defects: 1. the cooling efficiency is low, the effect is poor, the normal temperature nitrogen is adopted for cooling, the cooling is influenced by the environment, and the effect is poor and unstable when the air temperature is high. 2. The control precision is low, and the flow of the cooling nitrogen is uncontrollable. 3. The degree of automation is low, and an automatic control system is not provided. 4. The nitrogen is wasted, the cooling effect is poor, and in order to ensure the safety of equipment, the nitrogen is wasted greatly (Wen Qingkuang in the gearbox, the middle air supply port of the gearbox is always cooled by adopting unlimited maximum air supply). 5. The discharge amount is large, and the nitrogen consumption is large, so that the discharge amount of the blast furnace along with blast furnace gas is increased. 6. The failure rate is high, the temperature control effect of furnace top equipment is poor, the high-temperature damage is serious, and the service life of the equipment is short.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides a furnace top low-temperature nitrogen system which has the advantages of high automation degree, good safety, energy conservation and the like, can reduce the failure rate of a furnace top gear box, improves the material distribution working efficiency of a blast furnace and improves the working environment.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the furnace top low-temperature nitrogen system comprises a main pipeline for supplying nitrogen to furnace top equipment, wherein the main pipeline is provided with two branch gas supplies at a node A: the air source of the first branch cools the gear box through the first flow adjusting device, and the air source of the second branch cools the valve box through the second flow adjusting device and seals the top of the gear box; the first branch is also connected with a control system (and a refrigerator for cooling nitrogen).

Further, a gas tank, a filter, a check valve and a seventh butterfly valve which are sequentially connected are arranged on the main pipeline, and the on-off of nitrogen is controlled through the seventh butterfly valve.

Further, the first flow regulating device comprises a first pressure reducing valve, an electric regulating valve, a first flow meter, a first temperature transmitter (20), a first butterfly valve, a second temperature transmitter and a second butterfly valve which are sequentially arranged on the first branch along the nitrogen flow direction.

Further, the electric regulating valve, the first flowmeter, the first temperature transmitter and the second temperature transmitter are all connected with the control system; the control system is also connected with a refrigerator, and the refrigerator is connected to two ends of the first butterfly valve in parallel through a third butterfly valve and a fourth butterfly valve respectively.

Further, the gear box is also provided with a third temperature transmitter for detecting the temperature of the gear box, and the third temperature transmitter is connected with a control system.

Further, the refrigerator includes an evaporator and a condenser located inside thereof.

Further, the first pressure reducing valve is also connected with the fan through a fifth butterfly valve.

Further, the second flow regulating device comprises a pressure gauge, a second pressure reducing valve, a fourth temperature transmitter, a pressure transmitter, a second flowmeter, a second throttle valve and a sixth butterfly valve which are sequentially arranged on the second branch along the nitrogen flow direction, and the sixth butterfly valve is connected with the top of the gear box.

Further, the fourth temperature transmitter and the second flowmeter are also connected with a control system.

Further, the second flowmeter is connected with the valve box through the first throttle valve and the eighth butterfly valve.

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects: according to the furnace top low-temperature nitrogen system, the temperature of nitrogen is reduced by the refrigerator, the heat taken away by nitrogen cooling is increased, and the cooling efficiency is improved; the control system can carry out closed-loop control on the flow and the temperature of the cooling nitrogen, so that the automation degree and the control precision of the whole system are improved; through the cooperation of structures such as refrigerator and control system, reduced the operating temperature of furnace roof equipment, increased temperature control's stability, improved equipment operational environment, reduced the trouble, increased life.

In addition, the furnace top low-temperature nitrogen system saves energy, reduces consumption, greatly reduces nitrogen temperature, reduces nitrogen usage amount, saves cost and reduces the discharge amount of blast furnace gas; meanwhile, the furnace top low-temperature nitrogen system is safe and reliable, automatic control is adopted, a valve is not required to be manually adjusted, misoperation is avoided, safety of personnel and equipment is improved, and operation intensity of workers is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate principles of the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic diagram of a furnace top cryogenic nitrogen system provided by the utility model.

Wherein: 1. a gas tank; 2. a filter; 3. a check valve; 4. a seventh butterfly valve; 5. a pressure gauge; 6. a second pressure reducing valve; 7. a fourth temperature transmitter; 8. a pressure transmitter; 9. a second flowmeter; 10. a first throttle valve; 11. an eighth butterfly valve; 12. a second throttle valve; 13. a sixth butterfly valve; 14. a first pressure reducing valve; 15. a blower; 16. a fifth butterfly valve; 17. an electric control valve; 18. a control system; 19. a first flowmeter; 20. a first temperature transmitter; 21. a first butterfly valve; 22. a third butterfly valve; 23. a fourth butterfly valve; 24. a second temperature transmitter; 25. a refrigerating machine; 26. a second butterfly valve; 27. a third temperature transmitter; 28. a gear box; 29. a valve box.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of systems consistent with aspects of the utility model that are set forth in the following claims.

The present utility model will be described in further detail below with reference to the drawings and examples for better understanding of the technical solutions of the present utility model to those skilled in the art.

Examples

Referring to fig. 1, the embodiment provides a furnace top low-temperature nitrogen system, which comprises a main pipeline for providing nitrogen for furnace top equipment, wherein the main pipeline is divided into two branch gas supply branches at a node A: the air source of the first branch cools the gear box 28 through the flow regulating device, and the air source of the second branch cools the valve box 29 and seals the top of the gear box 28 through the flow regulating device; the first branch is also connected to a control system 18 and a refrigerator 25 for cooling the nitrogen.

Further, a gas tank 1, a filter 2, a check valve 3 and a seventh butterfly valve 4 which are sequentially connected are arranged on the main pipeline, and the on-off of nitrogen is controlled through the seventh butterfly valve 4.

Further, the first flow rate adjustment device includes a first pressure reducing valve 14, an electric control valve 17, a first flow meter 19, a first temperature transmitter 20, a first butterfly valve 21, a second temperature transmitter 24, and a second butterfly valve 26, which are disposed in this order along the nitrogen flow direction on the first branch.

Further, the electric regulating valve 17, the first flowmeter 19, the first temperature transmitter 20 and the second temperature transmitter 24 are all connected with the control system 18; the control system 18 is also connected with a refrigerator 25, and the refrigerator 25 is connected in parallel to two ends of the first butterfly valve 21 through a third butterfly valve 22 and a fourth butterfly valve 23 respectively.

Further, the gearbox 28 is also provided with a third temperature transmitter 27 for detecting its temperature, which third temperature transmitter 27 is connected to the control system 18.

Further, the refrigerator 25 includes an evaporator and a condenser inside thereof, and the evaporator is connected in parallel to both ends of the first butterfly valve 21 through a third butterfly valve 22 and a fourth butterfly valve 23, respectively.

Further, the first pressure reducing valve 14 is also connected to a fan 15 via a fifth butterfly valve 16.

Further, the second flow regulating device comprises a pressure gauge 5, a second pressure reducing valve 6, a fourth temperature transmitter 7, a pressure transmitter 8, a second flow meter 9, a second throttle valve 12 and a sixth butterfly valve 13 which are sequentially arranged on the second branch along the nitrogen flow direction, and the sixth butterfly valve 13 is connected with the top of the gear box 28.

Further, the fourth temperature transmitter 7, the second flowmeter 9 are also connected to a control system 18.

Further, the second flowmeter 9 is connected to a valve box 29 via a first throttle valve 10 and an eighth butterfly valve 11.

The furnace top low-temperature nitrogen system has the advantages of high automation degree, good safety, energy conservation and the like, can reduce the failure rate of the furnace top gear box 28, and improves the material distribution working efficiency of the blast furnace and the working environment. The specific working process principle and the process are as follows:

the nitrogen source of the system is supplied by a nitrogen tank 1, the gas supply loop supplies gas in two branches, one branch supplies the middle part of a gear box 28 and is used for cooling the gear box 28, and the other branch is divided into two branches for cooling a valve box 29 and sealing the upper part of the gear box 28 and the rotating part.

The main pipeline is provided with a gas tank 1, a filter 2, a check valve 3 and a seventh butterfly valve 4 which are sequentially connected, the on-off of a nitrogen gas source is controlled through the seventh butterfly valve 4, and the seventh butterfly valve 4 is closed to stop gas supply when overhauling or a blast furnace stops working.

The air source of the second branch is used for cooling the valve box 29 and sealing the top of the gear box 28 through the flow regulating device respectively, the air supply of the valve box 29 is mainly used for cooling, the damage to the sealing ring of the valve box 29 caused by high temperature is prevented, the air supply of the top of the gear box 28 is mainly used for sealing, and dust in the rising air flow of the blast furnace is prevented from entering through a gap of a rotating part, so that the gear box 28 is blocked. A first throttle valve 10 and an eighth butterfly valve 11 are installed in the branch of the valve box 29, the first throttle valve 10 can adjust the gas flow entering the valve box 29, and the eighth butterfly valve 11 can cut off the gas supply; a second throttle valve 12 and a sixth butterfly valve 13 are mounted in the top branch of the gearbox, the second throttle valve 12 being able to regulate the flow of gas into the top of the gearbox 28, the sixth butterfly valve 13 being able to shut off the gas supply.

The first branch enters the gear box 28 through the first pressure reducing valve 14, the electric regulating valve 17, the first flowmeter 19, the refrigerator 25 and the second butterfly valve 26, and cools the gear box 28. The first pressure reducing valve 14 reduces the high-pressure air source to 0.2-0.6 Mpa, the fifth butterfly valve 16 is in a closed state during normal operation, the electric regulating valve 17 is controlled by a signal of the control system 18, the nitrogen flow can be regulated, the first butterfly valve 21 is in a closed state, air enters the refrigerator 25 through the third butterfly valve 22 and flows out through the fourth butterfly valve 23, the refrigerator 25 cools down and controls the temperature of the nitrogen under the control of the control system 18, the third butterfly valve 22 and the fourth butterfly valve 23 are closed, the first butterfly valve 21 is opened, and the refrigerator 25 can be cut off to realize safe bypass and online maintenance of the refrigerator 25.

The control system 18 achieves the most economical and efficient cooling of the gearbox 28 by automatic calculation: the second flowmeter 9, the first flowmeter 19, the fourth temperature transmitter 7, the first temperature transmitter 20, the second temperature transmitter 24, the third temperature transmitter 27, the pressure transmitter 8 and the refrigerator 25 are connected to the control system 18, the control system 18 monitors various parameters, the control system 18 detects data of the third temperature transmitter 27 in the gearbox 28 to carry out closed-loop control, the flow of the cooling nitrogen is automatically regulated by controlling the electric regulating valve 17, and the temperature of the nitrogen is controlled by controlling the output power of the refrigerator 25. When the natural temperature of the nitrogen gas is lower, the nitrogen gas is first increased to cool the gear box 28, when the external temperature is higher, namely, the natural nitrogen gas temperature is higher, the control system first increases the power of the refrigerator 25 to cool the gear box 28, and the detection temperature (gear box temperature) of the third temperature transmitter 27 is lower, the control system 18 reduces the energy consumption by adjusting the electric control valve 17 and reducing/stopping the power of the refrigerator 25.

In addition, when the gearbox 28 is overhauled during blast furnace damping down, the seventh butterfly valve 4 is closed, the fifth butterfly valve 16 and the first pressure reducing valve 14 are opened, air is blown into the equipment through the fan 15, oxygen deficiency and asphyxia of overhaulers are prevented, and safety is improved.

The electric control valve 17 and the refrigerator 25 include, but are not limited to, those shown in the drawings, and the above control can be achieved by other refrigeration methods and control valves, and the present embodiment is not limited thereto.

In summary, in the furnace top low-temperature nitrogen system provided by the embodiment, the control system 18 and the execution detection element improve the automation of the nitrogen system, and unnecessary nitrogen and energy waste are reduced through automatic control; the cooling efficiency and the temperature control accuracy of the gear box 28 are improved, the working environment of the equipment is improved, faults are reduced, and the service life is prolonged.

The foregoing is only a specific embodiment of the utility model to enable those skilled in the art to understand or practice the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model.

It will be understood that the utility model is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims

1. A furnace roof cryogenic nitrogen system comprising a main line for providing nitrogen to furnace roof equipment, the main line being fed with gas in two branches at node a: the air source of the first branch cools the gear box (28) through the first flow adjusting device, the air source of the second branch cools the valve box (29) through the second flow adjusting device, and the top of the gear box (28) is sealed; the first branch is also connected with a control system (18) and a refrigerator (25) for cooling nitrogen.

2. The furnace top low-temperature nitrogen system according to claim 1, wherein a gas tank (1), a filter (2), a check valve (3) and a seventh butterfly valve (4) which are sequentially connected are arranged on the main pipeline, and the on-off of nitrogen is controlled through the seventh butterfly valve (4).

3. The furnace roof cryogenic nitrogen system according to claim 1, wherein the first flow regulating device comprises a first pressure reducing valve (14), an electric regulating valve (17), a first flow meter (19), a first temperature transmitter (20), a first butterfly valve (21), a second temperature transmitter (24) and a second butterfly valve (26) arranged in this order along the nitrogen flow direction on the first branch.

4. A furnace roof cryogenic nitrogen system according to claim 3, wherein the electrically operated regulator valve (17), the first flow meter (19), the first temperature transmitter (20), the second temperature transmitter (24) are all connected to a control system (18); the control system (18) is also connected with a refrigerator (25), and the refrigerator (25) is connected to two ends of the first butterfly valve (21) in parallel through a third butterfly valve (22) and a fourth butterfly valve (23) respectively.

5. The furnace top cryogenic nitrogen system according to claim 4, wherein the gearbox (28) is further provided with a third temperature transmitter (27) for detecting the temperature thereof, the third temperature transmitter (27) being connected to the control system (18).

6. The furnace top cryogenic nitrogen system according to claim 4, wherein the refrigerator (25) comprises an evaporator and a condenser inside thereof.

7. A furnace roof cryogenic nitrogen system according to claim 3, characterized in that the first pressure reducing valve (14) is also connected to a fan (15) by a fifth butterfly valve (16).

8. The furnace top cryogenic nitrogen system according to claim 1, wherein the second flow regulating device comprises a pressure gauge (5), a second pressure reducing valve (6), a fourth temperature transmitter (7), a pressure transmitter (8), a second flowmeter (9), a second throttle valve (12) and a sixth butterfly valve (13) which are arranged in sequence along the nitrogen flow direction on the second branch, wherein the sixth butterfly valve (13) is connected with the top of the gear box (28).

9. The furnace roof cryogenic nitrogen system according to claim 8, wherein the fourth temperature transmitter (7), the second flowmeter (9) are further connected to a control system (18).

10. The furnace roof cryogenic nitrogen system according to claim 8, wherein the second flowmeter (9) is further connected to the valve box (29) via a first throttle valve (10), an eighth butterfly valve (11).