A system and method for preventing dry burning of converter vaporization cooling wastewater

Abstract

The present invention relates to the field of iron and steel metallurgy technology, and in particular to a system and method for preventing dry burning of converter gasification cooling sewage; the system comprises a header, a conventional circulation system, an enhanced heat exchange circulation system and a drainage system, the conventional circulation system and the enhanced heat exchange circulation system comprise a circulation pump, the water outlet of the circulation pump is connected to the header to form a conventional circulation system, the enhanced heat exchange circulation system comprises a circulation valve, a first drainage pipe, the drainage system comprises a second drainage pipe, the second drainage pipe is connected to the first drainage pipe, a drainage valve is arranged on the second drainage pipe, and a drainage hose is arranged between the first drainage pipe and the second drainage pipe. The system realizes an enhanced heat exchange cycle by connecting the circulation pump with the first drainage pipe and the drainage hose, strengthens the heat exchange inside the drainage pipe, ensures the stable state of the drainage pipe under high temperature, avoids the overheating caused by the stagnation of internal water, improves the safety of each pipeline, and ensures the working performance of the entire system.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a system and method for preventing dry burning of wastewater discharged from converter during vaporization cooling. Background Art

[0002] The energy consumption of my country's steel enterprises is close to 10%. At the same time, there is still a big gap between the waste heat utilization rate of steel enterprises and developed countries. Therefore, improving waste heat recovery and energy utilization in the steel production process is one of the important ways to achieve efficient and green steel production. At present, there are two main ways to cool waste heat boilers, one is open circuit or circulating water direct cooling, and the other is vaporization cooling. Compared with direct water cooling, the steam generated by the vaporization cooling system can be incorporated into the steam pipe network of the plant for power generation, power, heating, etc., with higher energy utilization.

[0003] The waste heat boiler vaporization cooling system changes the traditional flue water cooling method to the vaporization cooling method, and sets different heat exchangers at different temperature sections of the flue, so as to efficiently recover the heat carried by the flue gas, and has a good heat collection effect for large converters and electric furnaces. During the use of the existing waste heat boiler vaporization cooling system, it was found that since there is no water circulation process inside the water discharge valve at the bottom of the flue of the mobile section of the existing waste heat boiler vaporization cooling system, this part of the pipes and valves are prone to leakage due to high temperature burning, affecting the use of the vaporization cooling sewage discharge process. Summary of the invention

[0004] In order to solve the above problems, on the one hand, the present invention provides a system for preventing dry burning of converter vaporization cooling sewage, comprising a manifold, a conventional circulation system, an enhanced heat exchange circulation system and a drainage system, the conventional circulation system and the enhanced heat exchange circulation system comprising a circulation pump, the water inlet end of the circulation pump is connected to the manifold, the water outlet end of the circulation pump is connected to the manifold to form a conventional circulation system, the enhanced heat exchange circulation system comprises a circulation valve and a first drain pipe, the water outlet end of the circulation pump is sequentially connected to the circulation valve, the first drain pipe and the manifold to form an enhanced heat exchange circulation system, the drainage system comprises a second drain pipe, the second drain pipe is connected to the first drain pipe, and the second drain pipe is provided with a drain valve.

[0005] Furthermore, the first drain pipe passes through the side wall of the dog house, and a drain hose is connected between the first drain pipe and the second drain pipe.

[0006] Furthermore, one end of the drainage hose away from the first drainage pipe is connected to the circulation valve and the second drainage pipe.

[0007] Furthermore, the drainage hose is located on the outside of the side wall of the dog house, and the drainage valve is located on the outside of the side wall of the dog house.

[0008] Furthermore, a protective layer is provided at the connection between the first drain pipe and the side wall of the dog house.

[0009] Furthermore, the drainage system also includes a sewage expansion tank, and the sewage expansion tank is connected to the output end of the second drainage pipe.

[0010] Furthermore, the water flow direction of the drainage system is the manifold, the first drainage pipe, the drainage hose, the second drainage pipe, and the sewage expansion tank in sequence.

[0011] Furthermore, the header is connected with a heat receiving pipe.

[0012] Furthermore, each pipeline of the conventional circulation system, the enhanced heat exchange circulation system and the drainage system is provided with a temperature detector.

[0013] On the other hand, the present invention also provides a method for preventing dry burning of blowdown during converter vaporization cooling, characterized in that it comprises the following steps:

[0014] S1: Turn on the circulation pump, the conventional circulation system starts, and the circulation pump pumps water to the header;

[0015] S2: Open the circulation valve, close the drain valve, and pump water into the header through the enhanced heat exchange circulation system;

[0016] S3: Before inspecting and draining, close the circulation valve, open the drain valve, and start the drainage system to drain the manifold.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] 1) The system and method for preventing dry burning of converter gasification cooling sewage provided by the present invention realizes enhanced heat exchange circulation by setting a connection between a circulating pump and a first drainage pipe and a drainage hose, thereby enhancing the heat exchange inside the drainage pipe, ensuring the stable state of the drainage pipe under high temperature conditions, avoiding overheating caused by the stagnation of internal water flow, improving the safety of each pipe, and ensuring the working performance of the entire system;

[0019] 2) The system and method for preventing dry burning of converter gasification cooling sewage provided by the present invention reduces the failure of the drainage valve due to high temperature burning by changing the position of the drainage valve, thereby improving the stability of the system operation;

[0020] 3) The system and method provided by the present invention for preventing dry burning of converter vaporization cooling sewage discharge, respectively arranging circulation valves and drainage valves in the enhanced heat exchange circulation system and the drainage system, can dynamically adjust the flow conditions in each pipe in the drainage system, achieve the effect of flow control, and reduce the impact of excessive temperature on the drainage valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the system for preventing dry burning of converter vaporization cooling sewage in the present invention.

[0022] 1-header; 2-heating pipe; 3-circulation pump; 4-circulation valve; 5-first drain pipe; 6-conventional circulation pipe; 7-second drain pipe; 8-drain valve; 9-dog house side wall; 10-drain hose; 11-protective layer; 12-sewage expansion tank. DETAILED DESCRIPTION

[0023] 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 in 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. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0024] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0026] In addition, in the description of the present invention, the terms "first", "second" and "third" are only used to distinguish in the description.

[0027] As the instruction manual Figure 1As shown, the present invention provides a system for preventing dry burning of converter vaporization cooling sewage, including a header 1, a conventional circulation system, an enhanced heat exchange circulation system and a drainage system, wherein the conventional circulation system, the enhanced heat exchange circulation system and the drainage system are all connected to the header 1, and the header 1 is also connected to a heat receiving pipe 2, the conventional circulation system and the enhanced heat exchange circulation system include a circulation pump 3, the water inlet end of the circulation pump 3 is connected to the header 1, and the water outlet end of the circulation pump 3 is connected to the header 1 through a conventional circulation pipeline 6 to form a conventional circulation system, and the enhanced heat exchange circulation system includes a circulation valve 4 and a first drainage pipe 5, and the water outlet end of the circulation pump 3 is sequentially connected to the circulation valve 4, the first drainage pipe 5, and the header 1 to form an enhanced heat exchange circulation system. Circulation system. In this embodiment, the conventional circulation system and the enhanced heat exchange circulation system share a circulation pump 3. The water inlet end of the circulation pump 3 is connected to the manifold 1, and the water outlet end is connected to the conventional circulation pipe 6 and the circulation valve 4, so as to realize conventional circulation and enhanced heat exchange circulation, and multi-branch connection can be realized through a three-way joint; of course, the conventional circulation system and the enhanced heat exchange circulation system can be two independent circulation systems, that is, they each include a circulation pump 3, and the two circulation pumps 3 can operate independently, and the conventional circulation system and the enhanced heat exchange circulation system can be independently regulated; the drainage system includes a second drainage pipe 7, and the second drainage pipe 7 is connected to the first drainage pipe 5, and the second drainage pipe 7 is provided with a drainage valve 8.

[0028] An optimized implementation manner, wherein the first drain pipe 5 passes through the side wall 9 of the dog house, and a drain hose 10 is connected between the first drain pipe 5 and the second drain pipe 7. The side wall 9 of the dog house is provided with a through hole for the first drain pipe 5 to pass through. After the first drain pipe 5 passes through the side wall 9 of the dog house, it is connected to the drain hose 10. The end of the drain hose 10 away from the first drain pipe 5 is connected to the circulation valve 4 and the second drain pipe 7. The drain hose 10 and the drain valve 8 are both on the outside of the side wall 9 of the dog house. The drain hose 10 is preferably a metal hose. During use, a margin for extension will be reserved to ensure mobility during operation. A protective layer 11 is provided at the connection between the first drain pipe 5 and the side wall 9 of the dog house. Specifically, a protective layer 11 is provided on both the inner and outer sides of the first drain pipe 5 passing through the side wall 9 of the dog house, which can protect the stability of the wall surface at the opening of the side wall 9 of the dog house, and also protect the first drain pipe 5 to avoid the influence of the first drain pipe 5 due to excessive temperature difference between the inside and outside of the dog house.

[0029] In an optimized implementation mode, the drainage system further comprises a sewage expansion tank 12, and the sewage expansion tank 12 is connected to the output end of the second drainage pipe 7. The water flow direction of the drainage system is the manifold 1, the first drainage pipe 5, the drainage hose 10, the second drainage pipe 7, and the sewage expansion tank 12 in sequence. When drainage maintenance is required, the drainage valve 8 is opened and the circulation pump 3 is closed. Then, the water in the manifold 1 flows through the first drainage pipe 5, the drainage hose 10, and the second drainage pipe 7 in sequence to the sewage expansion tank 12 for treatment, and the sewage is discharged after the treatment meets the standards; when performing drainage operation, the circulation valve 4 is opened, and the water in the pipeline where the circulation valve 4 is located is also discharged into the sewage expansion tank 12, and the water in the pipeline is completely discharged. Of course, when performing drainage operation, the circulation valve 4 can also be closed to discharge the water in the manifold 1. Furthermore, in order to ensure that all the water in the manifold 1 is drained, the first drainage pipe 5 is connected to the bottom of the manifold 1 to drain all the water in the manifold 1 as much as possible.

[0030] In this embodiment, during normal operation, the circulation valve 4 is opened and the drain valve 8 is closed to ensure the normal operation of the conventional circulation system and the enhanced heat exchange circulation system. The conventional circulation process is that the water in the manifold 1 is connected to the manifold 1 after passing through the circulation pump 3, forming a conventional circulation process; the enhanced heat exchange circulation process is that the water in the manifold 1 passes through the circulation pump 3, and then passes through the circulation valve 4, the drain hose 10, and the first drain pipe 5 in sequence to return to the manifold 1, forming an enhanced heat exchange circulation system, and enhancing the heat exchange of the first drain pipe 5; when the equipment needs to be drained for maintenance, the circulation pump 3 is turned off, the circulation valve 4 is closed, and the drain valve 8 is opened. Under its own gravity, the water in the heated pipe 2 and the manifold 1 passes through the first drain pipe 5, the drain hose 10, and the second drain pipe 7 and finally enters the sewage expansion tank 12 to complete the drainage process.

[0031] To refine the implementation method, in order to better regulate the conventional circulation system and the enhanced heat exchange circulation system, a flow metering valve can be set on the connecting pipeline between the circulation pump and the conventional circulation system and the enhanced heat exchange circulation system, so as to regulate the water flow of the conventional circulation system and the enhanced heat exchange circulation system to ensure the normal operation of the system; further, each pipeline of the conventional circulation system, the enhanced heat exchange circulation system and the drainage system is provided with a temperature detector, and the flow metering valve can be guided to adjust the flow of the conventional circulation system and the enhanced heat exchange circulation system according to the temperature on each pipeline, so as to improve the operation efficiency of the system.

[0032] The method of the system for preventing dry burning of converter gasification cooling wastewater according to the present invention specifically comprises the following steps:

[0033] S1: The circulation pump 3 delivers water to the header 1 through the conventional circulation pipe 6 to ensure the normal operation of the conventional circulation system;

[0034] S2: Open the circulation valve 4, and the circulation pump 3 pumps water through the circulation valve 4, the drainage hose 10, and the first drainage pipe 5 into the header to ensure the normal operation of the enhanced heat exchange circulation system;

[0035] S3: Open the drain valve 8, and the water in the header 1 passes through the first drain pipe 5, the drain hose 10, and the second drain pipe 7 and then enters the sewage expansion tank 12.

[0036] Furthermore, the temperature in the manifold is 145-200°C, and the operation of the enhanced heat exchange circulation system can enhance the heat exchange of the first drain pipe 5 and the drain hose 10, and the flow of the circulation pump 3 entering the conventional circulation system and the enhanced heat exchange system can be regulated to ensure the normal operation of the entire system.

[0037] To refine the implementation method, temperature detectors can be installed on each pipeline to detect the temperature of each pipeline and valve, detect the operating conditions of the system, and avoid local excessive temperature, which may lead to abnormal system operation or even damage to the pipelines and valves.

[0038] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0039] To sum up, the present invention provides a system and method for preventing dry burning of converter vaporization cooling sewage, which can reduce the failure of drain valves due to high-temperature burning, improve the stability of system operation, strengthen the heat exchange inside the drainage pipe, ensure the stable state of the first drainage pipe at high temperature, improve the safety of each pipe, and also improve the overall working performance. Through the regulation of the circulation valve and the drain valve, the flow conditions of each pipe in the drainage system can be dynamically adjusted and controlled to ensure that the original functions are not lost and the flow control effect can be achieved, which has a very positive significance for the practical application in the metallurgical industry.

[0040] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A system for preventing dry burning of converter gasification cooling wastewater, characterized in that: It includes a manifold, a conventional circulation system, an enhanced heat exchange circulation system and a drainage system. The conventional circulation system and the enhanced heat exchange circulation system include a circulation pump. The water inlet end of the circulation pump is connected to the manifold, and the water outlet end of the circulation pump is connected to the manifold to form a conventional circulation system. The enhanced heat exchange circulation system includes a circulation valve and a first drainage pipe. The water outlet end of the circulation pump is sequentially connected to the circulation valve, the first drainage pipe and the manifold to form an enhanced heat exchange circulation system. The drainage system includes a second drainage pipe, which is connected to the first drainage pipe and is provided with a drainage valve. A drainage hose is connected between the first drainage pipe and the second drainage pipe. The manifold is connected to a heat receiving pipe.

2. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 1 is characterized in that: The first drain pipe passes through the side wall of the dog house.

3. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 2 is characterized in that: One end of the drainage hose away from the first drainage pipe is communicated with the circulation valve and the second drainage pipe.

4. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 2 is characterized in that: The drainage hose is located on the outside of the side wall of the dog house, and the drainage valve is located on the outside of the side wall of the dog house.

5. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 2, characterized in that: A protective layer is provided at the connection between the first drain pipe and the side wall of the dog house.

6. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 2, characterized in that: The drainage system further comprises a sewage expansion tank, and the sewage expansion tank is connected to the output end of the second drainage pipe.

7. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 6, characterized in that: The water flow direction of the drainage system is the header, the first drainage pipe, the drainage hose, the second drainage pipe, and the sewage expansion container.

8. The system for preventing dry burning of converter vaporization cooling wastewater according to claim 1, characterized in that: Temperature detectors are provided on each pipeline of the conventional circulation system, the enhanced heat exchange circulation system and the drainage system.

9. A method for preventing dry burning of a converter vaporization cooling sewage discharge system according to any one of claims 1 to 8, characterized in that: The steps include: S1: Turn on the circulation pump, the conventional circulation system starts, and the circulation pump pumps water to the header; S2: Open the circulation valve, close the drain valve, and pump water into the header through the enhanced heat exchange circulation system; S3: Before inspecting and draining, close the circulation valve, open the drain valve, and start the drainage system to drain the manifold.

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