High-temperature reaction furnace outer wall temperature monitoring and control device

Abstract

The application relates to a high-temperature reaction furnace outer wall temperature monitoring and control device, which comprises a cooling water jacket sleeved on the outer wall of the reaction furnace, the cooling water jacket is a cavity annular ring, water inlets, water outlets, overflow outlets and steam outlets are arranged on the cooling water jacket, the water inlets are communicated with a cooling water tank through first pipelines, the water outlets are communicated with a sewage pipeline through second pipelines, the overflow outlets are communicated with the cooling water tank through third pipelines, and the steam outlets are communicated with a steam pipe network through fourth pipelines; a cooling water booster pump is connected in series on the first pipelines. The cooling device can realize indirect heat exchange between the outer wall of the reaction furnace and cooling water, replace 0.5MPa steam blowing and save energy. Through temperature display of the cooling water jacket temperature table and flow display of a cooling water flowmeter, the over-temperature condition of the outer wall of the reaction furnace can be continuously monitored, and the equipment safety is ensured. The cooling device can recover heat energy emitted by the outer wall of the reaction furnace, produce 0.5MPa steam as a byproduct, and save energy and reduce consumption.

Description

TECHNICAL FIELD

[0001] The application relates to a high-temperature reaction furnace outer wall temperature monitoring and control device. BACKGROUND

[0002] In the field of coal chemical technology, each reaction furnace is usually in a high-temperature state. Taking a methane synthesis process as an example, the temperature of a reaction furnace of a methane synthesis device is as high as 600 DEG C or above. In order to prevent high-temperature gas from directly contacting the inner wall of the reaction furnace, high-alumina castable refractory is used to cover the inner wall of the reaction furnace. However, due to poor construction quality, long running time and other reasons, cracks are easily generated in the castable refractory, so that the high-temperature reaction medium directly contacts the inner wall of the reaction furnace, and the outer wall of the reaction furnace shows local over-temperature. Since the material of the outer wall of the reaction furnace has limited high-temperature resistance, if over-temperature occurs during normal production, in order to avoid the temperature of the outer wall of the reaction furnace being too high and at the same time ensure safe production, 0.5 MPa steam is usually used to continuously blow the over-temperature part of the outer wall of the reaction furnace. During the blowing process of the 0.5 MPa steam, the temperature change of the over-temperature part cannot be monitored, and the temperature of the over-temperature part needs to be measured after the 0.5 MPa steam is stopped for a period of time.

[0003] In actual operation, when the outer wall of the reaction furnace is over-temperature, 0.5 MPa steam needs to be used to continuously blow and cool, which causes waste of steam resources. During the continuous blowing and cooling process of the 0.5 MPa steam, the 0.5 MPa steam interferes with the temperature measuring gun and other temperature measuring devices. If the temperature of the outer wall of the reaction furnace needs to be detected, the blowing of the 0.5 MPa steam needs to be stopped, so that the over-temperature condition of the outer wall of the reaction furnace cannot be continuously monitored under the premise of ensuring the safety of the equipment, which is not conducive to the safety of the equipment. The heat emitted by the outer wall of the reaction furnace is not recycled, which is not conducive to energy saving and consumption reduction. SUMMARY

[0004] In view of the above-mentioned defects, the purpose of the application is to provide a high-temperature reaction furnace outer wall temperature monitoring and control device which can continuously monitor the over-temperature condition of the outer wall of the reaction furnace, ensure the safety of the equipment and save energy and reduce consumption.

[0005] The purpose of the application is achieved by a high-temperature reaction furnace outer wall temperature monitoring and control device which comprises a cooling water jacket sleeved on the outer wall of the reaction furnace. The cooling water jacket is a hollow circular ring. An inlet, an outlet, an overflow and a steam port are arranged on the cooling water jacket. The inlet is communicated with a cooling water tank through a first pipeline. The outlet is communicated with a sewage pipeline through a second pipeline. The overflow is communicated with the cooling water tank through a third pipeline. The steam port is communicated with a steam pipe network through a fourth pipeline. A cooling water booster pump is connected in series on the first pipeline.

[0006] The cooling water jacket comprises a shell which is a hollow cylinder, a water jacket layer is arranged on the outer wall of the shell, and the inner wall of the water jacket layer is in contact with the outer wall of the high-temperature reaction furnace. The inner wall of the water jacket layer has limiting heads formed by extending the upper and lower ends of the inner wall out of the open ends of the upper and lower ends of the shell. The inner wall of the water jacket layer comprises a heat transfer layer and a plurality of limiting elastic sheets arranged in sequence on the outer surface of the heat transfer layer.

[0007] By installing the cooling device in the application, the outer wall of the reaction furnace can be indirectly heat-exchanged with the cooling water, replacing the 0.5MPa steam blowing, and saving energy. The over-temperature condition of the outer wall of the reaction furnace can be continuously monitored through the temperature display of the cooling water jacket temperature meter and the flow display of the cooling water flow meter, and the safety of the equipment is ensured. The heat energy emitted by the outer wall of the reaction furnace is recovered by the cooling device, 0.5MPa steam is by-produced, and energy is saved and consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0008] The specific structure of the application is shown in the following drawings and examples:

[0009] Fig. 1 is a structural schematic diagram of the application;

[0010] Fig. 2 is a structural schematic diagram of the cooling water jacket;

[0011] Fig. 3 is a structural schematic diagram of the inner wall of the shell.

[0012] Legend: 1, refractory castable, 2, skirt, 3, cooling water jacket, 301, shell, 302, limiting head, 303, inner wall, 304, heat transfer layer, 305, limiting elastic sheet, 4, steam pressure control valve, 5, cooling water flow control valve, 6, cooling water booster pump, 7, cooling water tank, 8, cooling water jacket temperature meter, 9, cooling water jacket liquid level meter, 10, cooling water jacket pressure gauge, 11, minimum backflow valve of the cooling water booster pump, 12, water jacket overflow valve, 13, desalted water flow control valve, 14, cooling water tank liquid level meter, 15, water jacket liquid discharge valve, 16, cooling water flow meter, 17, 0.5MPa steam pipe network check valve. DETAILED DESCRIPTION

[0013] The application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the application and the actual situation.

[0014] Example: as Figs. 1-3As shown, a high-temperature reactor outer wall temperature monitoring and control device includes a cooling water jacket 3 fitted around the outer wall of the reactor. The cooling water jacket 3 is a hollow annular shape, and is provided with a water inlet, a water outlet, an overflow outlet, and a steam outlet. The water inlet is connected to a cooling water tank 7 through a first pipeline, the water outlet is connected to a sewage pipe through a second pipeline, the overflow outlet is connected to the cooling water tank 7 through a third pipeline, and the steam outlet is connected to a steam network through a fourth pipeline. A cooling water booster pump 6 is connected in series on the first pipeline.

[0015] Furthermore, a return pipe is connected to the first pipeline, and the outlet end of the return pipe is connected to the interior of the cooling water tank 7. A return valve 11 is installed on the return pipe.

[0016] Furthermore, a flow control valve 5 and a cooling water flow meter 16 are connected in series on the first pipeline behind the cooling water booster pump 6.

[0017] Furthermore, a cooling water jacket temperature gauge 8, a cooling water jacket level gauge 9, and a cooling water jacket pressure gauge 10 are installed on the side wall of the cooling water jacket 3.

[0018] The cooling water tank 7 is equipped with a liquid replenishment port, which is connected to the liquid replenishment pipeline, and a demineralized water flow control valve 13 is installed on it.

[0019] Furthermore, a cooling water tank level gauge 14 is installed on the side wall of the cooling water tank 7.

[0020] A water jacket overflow valve 12 is installed on the third pipeline.

[0021] A steam pressure control valve 4 and a 0.5MPa steam network check valve are installed on the fourth pipeline.

[0022] like Figs. 2-3 As shown, the cooling water jacket 3 includes a shell 301, which is a hollow cylinder. A water jacket layer is provided around the outer wall of the shell 301, and the inner wall 303 of the water jacket layer contacts the outer wall of the high-temperature reactor. The upper and lower ends of the inner wall 303 of the water jacket layer extend beyond the open ends of the upper and lower ends of the shell 301 to form limiting heads 302. The inner wall 303 of the water jacket layer includes a heat transfer layer 304 and several sequentially arranged limiting springs 305 disposed on the outer surface of the heat transfer layer 304. The limiting springs 305 protrude inward to clamp the outer wall of the high-temperature reactor, and the limiting heads 302 are used to contact the skirt seat to determine the lowest clamping position. The temperature of the outer wall of the high-temperature reactor is transferred to the fluid in the water jacket layer through the heat transfer layer 304.

[0023] The application avoids welding the cooling water jacket directly on the outer wall of the high-temperature reaction furnace when in use, ensuring the safety of the equipment. The outer wall of the reaction furnace is prevented from directly contacting the cooling water, thereby preventing the outer wall of the reaction furnace from being corroded. In order to avoid the influence of the direct welding of the cooling water jacket 3 on the outer wall of the reaction furnace on the safety of the equipment, the cooling water jacket 3 in the application adopts a self-closed structure (equivalent to a ring-shaped cooling water tank surrounding the outer wall of the reactor), so that the inner wall of the cooling water jacket 3 is in close contact with the outer wall of the reaction furnace for heat transfer, thereby reducing the temperature of the outer wall of the reaction furnace. At the same time, the problem of corrosion of the outer wall caused by the long-term contact of the cooling water with the outer wall of the reaction furnace is also avoided. The reaction furnace skirt 2 can assist in supporting the weight of the cooling water jacket 3.

[0024] The cooling water of the cooling water jacket 3 uses desalted water, which can reduce the corrosion of the cooling device equipment pipeline, and the 0.5MPa steam by-product of the cooling device can be directly connected to the steam pipe network. In order to reduce the heat loss of the cooling water jacket 3, the outer side of the cooling water jacket 3 is covered with thermal insulation cotton.

[0025] Before the cooling water jacket 3 is put into operation, the cooling water tank 7 needs to be established first. During the establishment of the liquid level, the cooling water tank liquid level meter 14 monitors the water tank liquid level in real time, and transmits the liquid level signal to the desalted water flow control valve 13. The liquid level of the cooling water tank 7 is built to 80%, and then the liquid level of the cooling water tank 7 is controlled at 50-80% through the desalted water flow control valve 13.

[0026] The cooling water booster pump 6 is started to establish the liquid level of the cooling water jacket 3. During the establishment of the liquid level, the cooling water jacket liquid level meter 9 monitors the liquid level in real time, and transmits the liquid level signal to the cooling water flow control valve 5. By controlling the opening degree of the cooling water flow control valve 5, the liquid level of the cooling water jacket 3 is built to 90%. During the establishment of the liquid level, the water jacket overflow valve 12 is opened to prevent the cooling water jacket 3 from being over-pressurized due to being filled with water. After the liquid level is normal, the water jacket overflow valve 12 is closed, the liquid level of the cooling water jacket 3 is controlled at 80%-90%, and the steam pressure control valve 4 is set to 0.5MPa pressure for automatic control. When the liquid level of the cooling water jacket 3 is lower than 80%, the cooling water booster pump 6 is automatically started. When the liquid level of the cooling water jacket 3 is higher than 90%, the cooling water booster pump 6 is automatically stopped.

[0027] During normal operation of the reactor, the control room personnel monitor the pressure of the cooling water jacket 3 through the cooling water jacket pressure gauge 10, and according to the corresponding temperature of the saturated steam pressure of water, the temperature of the outer wall of the reactor can be calculated, for example, if the pressure of the cooling water jacket 3 is 0.5 MPa, the temperature of the outer wall of the reactor can be calculated to be about 150°C. If the temperature of the outer wall of the reactor is low and cannot reach the temperature of the by-produced low-pressure steam, under the condition that the temperature of the outer wall of the reactor is constant, the pressure of the cooling water jacket 3 is maintained constant and less than 0.5 MPa, at this time the liquid level of the cooling water jacket 3 is kept constant, if the pressure of the cooling water jacket 3 shows a rising trend, it indicates that the refractory castable of the inner wall of the reactor has cracks, which causes the temperature of the outer wall of the reactor to rise, and the refractory castable of the inner wall of the reactor needs to be checked and repaired during the shutdown and maintenance of the reactor, at this time the 0.5 MPa steam pipe network check valve 17 can prevent steam from flowing back to the cooling water jacket 3; if the temperature of the outer wall of the reactor is greater than 150°C, the cooling water jacket 3 can by-produce 0.5 MPa steam, if the temperature of the outer wall of the reactor is constant, the by-produced low-pressure steam flow of the cooling water jacket 3 is stable, and the cooling water flow meter 16 shows a stable state, if the cooling water flow meter 16 shows a rising trend, it indicates that the refractory castable of the inner wall of the reactor has cracks, which causes the heat transfer of the reactor wall to increase, and the refractory castable of the inner wall of the reactor needs to be checked and repaired during the shutdown and maintenance of the reactor. If the cooling water jacket 3 by-produces 0.5 MPa steam, and the amount of by-produced 0.5 MPa steam is less than the minimum flow requirement of the cooling water booster pump 6, the total flow of the cooling water booster pump 6 is controlled through the cooling water booster pump minimum backflow valve 11 to be equal to the minimum flow of the cooling water booster pump 6. When the amount of by-produced steam is greater than or equal to the minimum flow requirement of the cooling water booster pump 6, the cooling water booster pump minimum backflow valve 11 is automatically closed.

[0028] When the reactor is shut down for maintenance, the water in the cooling water jacket 3 can be drained through the water jacket drain valve 15.

[0029] The above description is only an example for clearly illustrating the present application, and is not a limitation on the embodiments of the present application. Any obvious changes or variations within the technical solutions of the present application are still within the protection scope of the present application.

Claims

1. A high temperature reaction furnace outer wall temperature monitoring and control device, characterized by: The cooling water jacket comprises a shell which is a hollow cylinder, and a water jacket layer is arranged on the outer wall of the shell, the inner wall of the water jacket layer is in contact with the outer wall of the high-temperature reaction furnace, and the upper and lower ends of the inner wall of the water jacket layer extend out of the open ends of the upper and lower ends of the shell to form limiting heads; the inner wall of the water jacket layer comprises a heat transfer layer and a plurality of limiting elastic sheets arranged in sequence on the outer surface of the heat transfer layer. A backflow pipe is connected to the first pipeline, the water outlet end of the backflow pipe is in communication with the inside of the cooling water tank, and a backflow valve is installed on the backflow pipe. A flow control valve and a cooling water flow meter are connected in series to the first pipeline behind the cooling water booster pump. A cooling water jacket temperature meter, a cooling water jacket liquid level meter, and a cooling water jacket pressure meter are installed on the side wall of the cooling water jacket. A water jacket overflow valve is installed on the third pipeline, and a steam pressure control valve and a 0.5MPa steam pipe network check valve are installed on the fourth pipeline. The cooling water tank is provided with a liquid supplementing port which is in communication with a liquid supplementing pipeline and is provided with a desalted water flow control valve.

2. A high temperature reaction furnace outer wall temperature monitoring and control device according to claim 1, characterized in that: A cooling water tank liquid level meter is arranged on the side wall of the cooling water tank.

3. A high temperature reaction furnace outer wall temperature monitoring and control device as claimed in claim 2, characterized in that: ​

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