Dry furnace cooling system

Abstract

The present application provides a drying furnace cooling system, which relates to the technical field of coal preparation. The drying furnace cooling system includes an atomizing device and a pressure balancing device. The atomizing device is connected to one end of the drying furnace and is used to convey cooling mist to the drying furnace. The pressure balancing device is connected to the other end of the drying furnace and is used to keep a negative pressure environment in the drying furnace when the atomizing device conveys cooling mist into the drying furnace. By providing an atomizing device and a pressure balancing device in the drying furnace, it is possible to cool the inside of the drying furnace with cooling mist while maintaining a negative pressure in the drying furnace, achieving the effect of quickly cooling the furnace.

Description

Technical Field

[0001] This application relates to the technical field of coal preparation, and particularly to a drying furnace cooling system. Background Art

[0002] The drying furnace is an important device for providing heat in the entire pulverized coal preparation system. The daily working temperature inside the drying furnace body is relatively high, and the highest temperature exceeds 1000°C. Before routine maintenance or repair of the inside of the drying furnace, the temperature inside the drying furnace body needs to be reduced to normal temperature before entering for construction operations.

[0003] Currently, the natural cooling method of the drying furnace is the most common means. Under the condition of sufficient maintenance time, natural cooling is a good method. However, due to the long natural cooling time, especially in hot summers, natural cooling is even slower. In the case of a tight construction period, the natural cooling method is likely to delay the construction period and seriously affect the operation efficiency of the coal pulverizing system. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the related art, this application provides a drying furnace cooling system to solve the above technical problems.

[0005] A drying furnace cooling system provided by this application includes:

[0006] An atomization device, which is connected to one end of the drying furnace, and is used to convey cooling mist to the drying furnace;

[0007] A pressure balance device, which is arranged at a different end of the drying furnace from the atomization device, and is used to keep a negative pressure environment inside the drying furnace when the atomization device conveys cooling mist into the drying furnace.

[0008] In an embodiment of this application, the atomization device includes an atomizing air regulating valve, a water quantity regulating valve, an atomization module, and a control valve. The input end of the atomization module is connected to the atomizing air regulating valve and the water quantity regulating valve. Input air is input into the atomization module through the atomizing air regulating valve, and input water is input into the atomization module through the water quantity regulating valve. The input air and the input water obtain the cooling mist in the atomization module, and the cooling mist is input into the drying furnace through the control valve.

[0009] In an embodiment of this application, the input air is compressed air.

[0010] In an embodiment of the present application, the cooling system of the drying furnace further includes a temperature monitoring device. The control valve includes a first control valve and a second control valve. The first control valve is used to control the small pipeline, and the second control valve is used to control the large pipeline. The temperature monitoring device is used to monitor the temperature inside the drying furnace;

[0011] When the temperature inside the drying furnace is greater than or equal to a first preset temperature, the first control valve is opened;

[0012] When the temperature inside the drying furnace is less than or equal to the first preset temperature, the first control valve and the second control valve are opened, or the second control valve is opened.

[0013] In an embodiment of the present application, the atomizing device further includes a wind pressure monitoring module and a water pressure monitoring module. The wind pressure monitoring module is used to monitor the input air pressure, and the water pressure monitoring module is used to monitor the input water pressure. By changing the opening degrees of the atomizing air regulating valve and the water volume regulating valve, the ratio of the input air pressure to the input water pressure is made to be a target ratio.

[0014] In an embodiment of the present application, the pressure balancing device includes a first regulating valve and a relief pipe. When the atomizing device conveys cooling mist into the drying furnace, the first regulating valve is opened to keep the inside of the drying furnace in a negative pressure environment through the first regulating valve and the relief pipe.

[0015] In an embodiment of the present application, the pressure balancing device further includes a second regulating valve and an exhaust fan. The cooling system of the drying furnace further includes a pressure monitoring device, which is used to monitor the pressure inside the drying furnace;

[0016] When the pressure inside the drying furnace is greater than or equal to a preset pressure, the second regulating valve and the exhaust fan are opened.

[0017] In an embodiment of the present application, the diameter of the relief pipe near the first regulating valve is smaller than the diameter of the relief pipe far from the first regulating valve.

[0018] In an embodiment of the present application, the cooling system of the drying furnace further includes an air cooling device, which is used to convey cooling air into the drying furnace. The air cooling device and the pressure balancing device are located at different ends of the drying furnace.

[0019] In an embodiment of the present application, the air cooling device includes an air cooling fan, and the air cooling fan is connected to the drying furnace through a connecting pipeline.

[0020] As described above, a cooling system of a drying furnace provided by the present application has the following beneficial effects:

[0021] A dry furnace cooling system in the present application, the dry furnace cooling system includes an atomizing device and a pressure balancing device. The atomizing device is connected to one end of the dry furnace, and the atomizing device is used to convey cooling mist to the dry furnace. The pressure balancing device is connected to the other end of the dry furnace, and the pressure balancing device is used to keep the inside of the dry furnace in a negative pressure environment when the atomizing device conveys cooling mist into the dry furnace. By arranging the atomizing device and the pressure balancing device in the dry furnace, the inside of the dry furnace can be cooled by using cooling mist while maintaining a negative pressure inside the dry furnace, achieving the effect of quickly cooling the furnace.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0024] Figure 1 is a schematic diagram of the dry furnace cooling system shown in an exemplary embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the dry furnace cooling system shown in another exemplary embodiment of the present application.

[0026] The reference numerals in the specification drawings include: 110 - atomizing device; 111 - atomizing air regulating valve; 112 - water volume regulating valve; 113 - atomizing module; 114 - control valve; 114a - first control valve; 114b - second control valve; 115 - air pressure monitoring module; 116 - water pressure monitoring module; 120 - pressure balancing device; 121 - first regulating valve; 122 - relief pipe; 123 - second regulating valve; 124 - exhaust fan; 130 - temperature monitoring device; 140 - pressure monitoring device; 150 - air cooling device; 151 - air cooling fan; 152 - air cooling control valve; 152a - first air cooling control valve; 152b - second air cooling control valve; 200 - dry furnace. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments of the present application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, rather than for limiting the protection scope of the present application.

[0028] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0029] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0030] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a drying furnace cooling furnace system shown in an exemplary embodiment of the present application. Referring to Figure 1 it can be seen that the drying furnace cooling furnace system may include:

[0031] An atomizing device 110, which is connected to one end of the drying furnace 200. The atomizing device 110 is used to convey cooling mist to the drying furnace 200. The atomizing device 110 can be connected to the drying furnace 200 through a pipeline. Figure 1 The direction of the arrow in

[0032] can represent the flow direction of the gas (including the cooling mist). A pressure balancing device 120, which is connected to the other end of the drying furnace 200. The pressure balancing device 120 is used to keep a negative pressure environment in the drying furnace 200 when the atomizing device 110 conveys cooling mist into the drying furnace 200. The pressure balancing device 120 can also be connected to the drying furnace 200 through a pipeline. Keeping a negative pressure environment in the drying furnace 200 can facilitate the discharge of the gas in the drying furnace 200 from the drying furnace 200.

[0033] It should be noted that the cooling mist can be input into the drying furnace 200 from the atomizing device 110 to cool the drying furnace 200. After the cooling mist evaporates in the drying furnace 200, the pressure balancing device 120 can be used to maintain a negative pressure environment in the drying furnace 200. Arranging the atomizing device 110 and the pressure balancing device 120 at different ends of the drying furnace 200 can make the temperature in the furnace more uniform during the cooling process of the drying furnace 200.

[0034] Please refer to Figure 2 , which is a schematic structural diagram of the drying furnace cooling system shown in another exemplary embodiment of the present application. The atomizing device 110 may include an atomizing air regulating valve 111, a water volume regulating valve 112, an atomizing module 113, and a control valve 114. The input end of the atomizing module 113 is connected to the atomizing air regulating valve 111 and the water volume regulating valve 112. The input air is input into the atomizing module 113 through the atomizing air regulating valve 111, and the input water is input into the atomizing module 113 through the water volume regulating valve 112. The input air and the input water are turned into cooling mist through the atomizing module 113, and the atomizing module 113 inputs the cooling mist into the drying furnace 200 through the control valve 114.

[0035] In one embodiment of the present application, the input air is compressed air. The atomizing air regulating valve 111 and the water volume regulating valve 112 can respectively adjust the atomizing air pressure and the atomizing water volume.

[0036] In one embodiment of the present application, the drying furnace cooling system may further include a temperature monitoring device 130. The control valve 114 may include a first control valve 114a and a second control valve 114b. The first control valve 114a can be used to control the small pipeline, and the second control valve 114b can be used to control the large pipeline. The temperature monitoring device 130 can be used to monitor the temperature in the drying furnace 200.

[0037] When the temperature in the drying furnace 200 is greater than or equal to the first preset temperature, the first control valve 114a is opened.

[0038] When the temperature in the drying furnace 200 is less than or equal to the first preset temperature, the first control valve 114a and the second control valve 114b are opened, or the second control valve 114b is opened.

[0039] It should be noted that the first control valve 114a can be used to control the small pipeline connecting the atomizing module 113 and the drying furnace 200. The second control valve 114b can be used to control the large pipeline connecting the atomizing module 113 and the drying furnace 200. The diameter of the small pipeline is smaller than that of the large pipeline.

[0040] Exemplarily, the first preset temperature can be 500 degrees Celsius. The control valve 114 can be a stop valve.

[0041] In an embodiment of the present application, the atomizing device 110 may further include a wind pressure monitoring module 115 and a water pressure monitoring module 116. The wind pressure monitoring module 115 is used to monitor the input air pressure, and the water pressure monitoring module 116 is used to monitor the input water pressure. By changing the opening degrees of the atomizing air regulating valve 111 and the water volume regulating valve 112, the ratio of the input air pressure to the input water pressure is made to be a target ratio.

[0042] It should be noted that the atomizing device may also be provided with a water temperature monitoring module to adjust the input water temperature according to the temperature and pressure in the drying furnace.

[0043] Exemplarily, the target ratio may be 1.2. The ratio of the atomizing air pressure to the water pressure can be automatically tracked and adjusted to adjust the ratio to the target ratio, which may be 1.2, and the atomizing effect is better at this ratio. The atomizing air pressure is adjusted according to the water pressure, and the atomizing water volume can be adjusted according to the pressure in the drying furnace.

[0044] In an embodiment of the present application, the pressure balance device 120 may include a first regulating valve 121 and a discharge pipe 122. When the atomizing device 110 conveys cooling mist into the drying furnace 200, the first regulating valve 121 is opened to keep the inside of the drying furnace 200 in a negative pressure environment through the first regulating valve 121 and the discharge pipe 122.

[0045] In an embodiment of the present application, the diameter of the discharge pipe 122 near the first regulating valve 121 is smaller than the diameter of the discharge pipe 122 far from the first regulating valve 121. That is, the diameter of the discharge pipe 122 gradually decreases in the direction towards the first regulating valve 121.

[0046] In an embodiment of the present application, the pressure balance device 120 may further include a second regulating valve 123 and a suction fan 124. The drying furnace cooling system may further include a pressure monitoring device 140 for monitoring the pressure inside the drying furnace 200.

[0047] It should be noted that when the pressure inside the drying furnace 200 is greater than or equal to the preset pressure, that is, when the first regulating valve 121 and the discharge pipe 122 alone cannot keep the pressure inside the drying furnace negative, the second regulating valve 123 and the suction fan 124 can be opened.

[0048] Exemplarily, the preset pressure may be -200 Pa.

[0049] In an embodiment of the present application, the drying furnace cooling system may further include an air cooling device 150 for conveying cooling air into the drying furnace 200. The air cooling device 150 and the pressure balance device 120 are located at different ends of the drying furnace 200.

[0050] In an embodiment of the present application, the air-cooling device 150 may include an air-cooling fan 151, and the air-cooling fan 151 is connected to the drying furnace 200 through a connecting pipeline. The air-cooling device 150 may further include an air-cooling control valve 152. In Figure 2 the drying furnace cooling system shown, the air-cooling control valve 152 may include a first air-cooling control valve 152a and a second air-cooling control valve 152b.

[0051] It should be noted that the air-cooling fan 151 may be connected to the drying furnace 200 through a separate pipeline, or the combustion-supporting fan connected to the drying furnace may be used as the air-cooling fan in the drying furnace cooling system, and the embodiments of the present application do not limit this. When the combustion-supporting fan connected to the drying furnace is used as the air-cooling fan in the drying furnace cooling system, the large-pipeline combustion-supporting valve and the small-pipeline combustion-supporting valve connected to the drying furnace may be used as the air-cooling control valves.

[0052] Exemplarily, in the first-stage temperature reduction: the temperature in the drying furnace is reduced from the initial temperature to a first preset temperature, where the first preset temperature is 500 °C.

[0053] Since the initial temperature in the drying furnace is relatively high, the temperature reduction process in the first step is a uniform temperature reduction process, and the amount of cooling mist should not be too large to prevent the rapid expansion of the high temperature in the drying furnace when encountering water, resulting in a rapid increase in the furnace pressure and the explosion-proof membrane provided on the drying furnace being burst due to the inability to discharge the furnace pressure in time. At the same time, it is necessary to prevent the refractory material in the drying furnace from shrinking and cracking after being rapidly cooled at a high temperature.

[0054] Open the combustion-supporting valve 152a, the combustion-supporting valve 152b, the atomizing air regulating valve 111, the combustion-supporting fan 151, the atomizing device 113, the water volume regulating valve 112, and the first control valve 114a on the small pipeline. Open the first regulating valve 121, and according to the pressure in the drying furnace 200, the second regulating valve 123 and the exhaust fan 124 may be selected to be opened. The initial opening of the second regulating valve 123 may be set at about 30%, and subsequent automatic adjustment is performed according to the pressure condition of the drying furnace to keep the drying furnace pressure at about -200 Pa.

[0055] Second-stage temperature reduction: the temperature in the drying furnace is rapidly reduced from 500 °C to room temperature

[0056] When the temperature in the drying furnace is reduced to 500 °C, open the first control valve 114a on the small pipeline and the second control valve 114b on the large pipeline, or only open the second control valve 114b. The water volume regulating valve 112 and the atomizing air regulating valve 111 are automatically opened wide, and at the same time the second regulating valve 123 is opened wide, and the temperature in the drying furnace is rapidly reduced by increasing the amount of cooling mist that absorbs heat in the drying furnace.

[0057] In the embodiments of the present application, through the PLC control program, all the above processes can be fully automatically controlled. In special cases, manual operation can also be switched to. In the automatic control mode, an atomizing air regulating valve, a water quantity regulating valve, a suction regulating valve, pressure gauges and thermometers at various places are interlocked in the system. The specific interlocks are as follows:

[0058] The atomizing air regulating valve 111 and the water quantity regulating valve 112 respectively adjust the atomizing air pressure and the atomizing water quantity. The ratio of the atomizing air pressure to the water pressure is automatically tracked and adjusted, and the ratio is controlled at 1.2 to ensure the atomizing effect. The adjustment process is as follows: the atomizing air pressure is automatically adjusted according to the water pressure, and the atomizing water quantity is adjusted according to the drying furnace pressure.

[0059] When the drying furnace has a positive pressure, the second regulating valve 123 automatically opens wider. If the positive pressure phenomenon still cannot be eliminated after opening to the maximum, at this time, the water quantity regulating valve 112 and the atomizing air regulating valve 111 automatically adjust smaller to reduce the amount of cooling fog entering the drying furnace. On the contrary, when the negative pressure of the drying furnace is too large (exceeding -200 Pa), the second regulating valve 123 automatically adjusts smaller. If the negative pressure exceeds the standard still cannot be eliminated after opening to the minimum opening of 30%, at this time, the water quantity regulating valve 112 and the atomizing air regulating valve 111 automatically adjust larger to increase the amount of cooling fog entering the drying furnace. The system continuously and automatically tracks the parameter changes at various places and realizes automatic adjustment.

[0060] The large and small pipelines at the outlet of the atomizing device are interlocked with the drying furnace temperature in the automatic state, that is: when the drying furnace hearth temperature is above 500 °C, the first control valve 114a on the small pipeline is opened, and when it is below 500 °C, the second control valve 114b on the large pipeline is opened (or the first control valve 114a and the second control valve 114b are opened simultaneously). When the water flow rate is low and the cooling rate of the drying furnace is relatively slow, the first control valve 114a and the second control valve 114b can be opened simultaneously, and the water quantity regulating valve 112, the atomizing air regulating valve 111 and the second regulating valve 123 are opened wider.

[0061] In the embodiments of the present application, the drying furnace cooling system mainly realizes rapid cooling through the flow of cooling air and cooling fog in the drying furnace. Compared with the traditional natural cooling, the cooling efficiency is greatly improved. The induced draft fan set in the drying furnace cooling system can keep the drying furnace in a normal negative pressure, effectively ensuring the flow of cooling air and cooling fog in the furnace and realizing the rapid heat exchange and cooling of the cold medium in the furnace. After the atomizing air regulating valve 111 and the water quantity regulating valve 112 realize automatic tracking adjustment, the air volume, air pressure and water quantity can be adjusted at any time to ensure the constant ratio of the atomizing air pressure to the water pressure and ensure a good atomizing effect. The first control valve and the second control valve corresponding to the large and small atomizing pipelines set in the drying furnace cooling system can meet the cooling requirements under different conditions. The cooling and temperature reduction process is divided into two stages, which not only ensures the safety of the drying furnace cooling process, but also improves the cooling efficiency.

[0062] In the embodiments of the present application, each device can be connected to the drying furnace through pipelines to achieve the cooling of the drying furnace.

[0063] It should be noted that Figure 2 the arrows without labels can represent the flow direction of water or gas.

[0064] In summary, the embodiments of the present application provide a drying furnace cooling system, which includes an atomizing device and a pressure balancing device. The atomizing device is connected to one end of the drying furnace, and the atomizing device is used to convey cooling mist to the drying furnace. The pressure balancing device is connected to the other end of the drying furnace, and the pressure balancing device is used to keep a negative pressure environment in the drying furnace when the atomizing device conveys cooling mist into the drying furnace. By setting the atomizing device and the pressure balancing device in the drying furnace, the drying furnace can be cooled with cooling mist under the condition of maintaining a negative pressure in the drying furnace, achieving the effect of rapid cooling.

[0065] The above embodiments are only used to exemplarily illustrate the principles and effects of the present application, rather than to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A cooling furnace system for a drying furnace, characterized in that, The drying furnace cooling system includes: An atomization device, which is connected to one end of the drying furnace and is used to convey cooling mist to the drying furnace; A pressure balance device, which is arranged at a different end of the drying furnace from the atomization device and is used to keep a negative pressure environment in the drying furnace when the atomization device conveys cooling mist into the drying furnace; The atomization device includes an atomizing air regulating valve, a water volume regulating valve, an atomization module and a control valve. The input end of the atomization module is connected with the atomizing air regulating valve and the water volume regulating valve. The input air is input into the atomization module through the atomizing air regulating valve, and the input water is input into the atomization module through the water volume regulating valve. The input air and the input water obtain the cooling mist in the atomization module, and the cooling mist is input into the drying furnace through the control valve; The drying furnace cooling system further includes a temperature monitoring device. The control valve includes a first control valve and a second control valve. The first control valve is used to control the small pipeline connecting the atomization module and the drying furnace, and the second control valve is used to control the large pipeline connecting the atomization module and the drying furnace. The diameter of the small pipeline is smaller than that of the large pipeline. The temperature monitoring device is used to monitor the temperature in the drying furnace; When the temperature in the drying furnace is greater than or equal to the first preset temperature, the first control valve is opened; When the temperature in the drying furnace is less than or equal to the first preset temperature, the first control valve and the second control valve are opened, or the second control valve is opened.

2. The drying furnace cooling furnace system according to claim 1, wherein The input air is compressed air.

3. The drying furnace cooling furnace system according to claim 1, wherein The atomization device further includes a wind pressure monitoring module and a water pressure monitoring module. The wind pressure monitoring module is used to monitor the input air pressure, and the water pressure monitoring module is used to monitor the input water pressure. By changing the opening degrees of the atomizing air regulating valve and the water volume regulating valve, the ratio of the input air pressure to the input water pressure is made to be the target ratio.

4. The cooling furnace system of the drying furnace according to claim 1, characterized in that, The pressure balance device includes a first regulating valve and a discharge pipe. When the atomization device conveys cooling mist into the drying furnace, the first regulating valve is opened to keep a negative pressure environment in the drying furnace through the first regulating valve and the discharge pipe.

5. The drying furnace cooling furnace system according to claim 4, wherein, The pressure balance device further includes a second regulating valve and an induced draft fan. The drying furnace cooling system further includes a pressure monitoring device, which is used to monitor the pressure in the drying furnace; When the pressure in the drying furnace is greater than or equal to the preset pressure, the second regulating valve and the induced draft fan are opened.

6. The dry furnace cooling furnace system according to claim 5, characterized in that, The diameter of the discharge pipe near the first regulating valve is smaller than the diameter of the discharge pipe far from the first regulating valve.

7. The drying furnace cooling furnace system according to claim 1, wherein The drying furnace cooling system further includes an air cooling device, which is used to convey cooling air into the drying furnace. The air cooling device and the pressure balance device are located at different ends of the drying furnace.

8. The drying furnace cooling furnace system according to claim 7, characterized in that, The air cooling device includes an air cooling fan, and the air cooling fan is connected to the drying furnace through a connecting pipeline.

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