Flame path temperature control system of pot-type calcining furnace

Abstract

The flame path temperature control system comprises at least two heating flame paths which are sequentially arranged in the front-back direction, a calcining pot is arranged between every two adjacent heating flame paths, each heating flame path comprises a furnace body, and multiple layers of heating flame paths which are sequentially communicated and arranged in an S shape are formed in the furnace body from top to bottom; the uppermost layer of heating flame path is communicated with a fuel gas feeding port, the lowermost layer of heating flame path is communicated with a flue, a temperature measuring element is arranged in each layer of heating flame path, each layer of heating flame path is further connected with a flame path air supplementing port, and an air supplementing port valve capable of being opened or closed is arranged at each flame path air supplementing port; the fuel gas feeding system comprises fuel gas feeding pipes communicated with all the layers of heating flame paths, and feeding pipe valves are arranged on all the fuel gas feeding pipes. According to the flame path temperature control system of the pot-type calcining furnace, the temperature of the heating flame paths can be independently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of pot-type calcining furnaces, and particularly to a flue temperature control system for a pot-type calcining furnace. Background Art

[0002] The pot-type calcining furnace includes a number of vertically arranged calcining pots made of refractory materials. Generally, at least two calcining pots arranged side by side are taken as a group, and each group of calcining pots is arranged sequentially in the front-back direction. Different numbers of groups are set according to the requirements of configuration and production capacity to meet the production needs.

[0003] Heating flues are arranged on both the left and right sides of each calcining pot. The existing heating flue structure is as disclosed in the Chinese patent CN218567913U, "An Automatic Temperature Control System for a Calcining Furnace by Compressed Air Method", which includes a furnace body. Inside the furnace body, there are multiple layers of flues arranged in an S-shape and connected in sequence from top to bottom. The inlet of the first-layer flue (the first layer of flue from top to bottom) is connected to the volatile matter pipeline, and a damper is provided at the connection. An upper temperature measuring element and a lower temperature measuring element are respectively arranged in the second-layer flue and the bottom-layer flue. The upper temperature measuring element is used to detect the temperature of the second-layer flue, and the lower temperature measuring element is used to detect the temperature of the bottom-layer flue. The outlet of the bottom-layer flue is connected to a smoke exhaust flue located on the right side of the furnace body, and the top height of the smoke exhaust flue is higher than the top height of the fifth-layer flue.

[0004] During actual use, the smoke exhaust flue is in a negative pressure environment. The fuel from the gas source enters the first-layer flue for combustion, then burns along the flue, and conducts heat non-contact with the materials in the combustion pot. Among them, the temperature control of the bottom-layer flue is relatively important because too high a temperature in the bottom-layer flue will cause the cast iron support furnace bottom plate to burn out, seriously affecting the service life of the calcining furnace. Therefore, in the prior art, when the lower temperature measuring element detects that the temperature of the bottom-layer flue exceeds the set value, the damper opens, and cold air enters from the first-layer flue. From top to bottom, the temperatures of each layer of flues gradually start to decrease, and the temperature of the first-layer flue decreases first. When the temperature of the bottom-layer flue is lower than the set value, the damper closes.

[0005] The problem with the existing temperature control mode is that in the entire flue structure, when the bottom-layer flue needs to be cooled down, the first-layer flue first enters cold air and cools down first. When the bottom-layer flue reaches the designed temperature, the temperatures of the first-layer flue and other layer flues may already be lower than the set temperature, which will inevitably cause problems with the quality of carbon products.

[0006] In addition, the temperatures of the calcining furnace pot groups at different positions are not the same. Usually, the temperatures of the calcining furnace pot groups at the front and rear ends are lower than those of the calcining furnace pot groups in the middle position. In the prior art, it is also impossible to achieve the temperature control of a single heating flue in each calcining furnace pot group. Summary of the Invention

[0007] The object of the present invention is to provide a flue temperature control system for a pot-type calciner in which the heating flues can be independently temperature-controlled from each other.

[0008] To solve the above technical problems, the technical solution of a flue temperature control system for a pot-type calciner in the present invention is as follows: A flue temperature control system for a pot-type calciner includes at least two heating flues arranged sequentially in the front-rear direction. There is a calcining pot between adjacent heating flues. The heating flue includes a furnace body. Inside the furnace body, multiple layers of heating flues arranged in an S shape and communicating with each other in sequence are formed from top to bottom. A gas feed port is connected to the uppermost layer of heating flues, and a flue is connected to the lowermost layer of heating flues. Temperature measuring elements are provided in each layer of heating flues. A flue air supply port is also connected to each layer of heating flues. A supply port valve that can be opened or closed is provided at the flue air supply port. The flue temperature control system further includes a gas replenishment system. The gas replenishment system includes gas replenishment pipes respectively communicating with each layer of heating flues, and a replenishment pipe valve is provided on each gas replenishment pipe.

[0009] Further, a plurality of furnace body partitions are arranged at intervals in the up-down direction in the inner cavity of the furnace body. The furnace body partitions divide the inner cavity of the furnace body into the heating flues. A flue communication port for communicating adjacent two layers of heating flues in the up-down direction is formed between the furnace body partition and the left or right side wall of the furnace body. The flue temperature control system further includes a flue communication port adjusting device.

[0010] Further, the flue communication port adjusting device includes an adjusting valve that is guided and movably assembled on the corresponding furnace wall in the left-right direction. The adjusting valve is made of refractory plate material. The flue communication port adjusting device further includes an adjusting valve actuator arranged outside the furnace body and corresponding to the adjusting valve one by one. The action output end of the adjusting valve actuator is connected to the adjusting valve. The adjusting valve moves towards the corresponding furnace body partition to reduce the opening size of the flue communication port.

[0011] Further, one end of the adjusting valve away from the furnace body is connected with a valve joint through a dovetail groove. The action output end of the adjusting valve actuator is hinged to the valve joint.

[0012] Further, a heat insulation and sealing cover is provided outside the periphery of the valve joint. One end of the heat insulation and sealing cover is fixed on the outer wall of the furnace body, and the other end of the heat insulation and sealing cover is in guiding and moving cooperation with the action output end of the adjusting valve actuator.

[0013] Further, the supply port valve is a solenoid valve; or the supply port valve includes a rotatably assembled rotary cover plate. A push handle is connected to the rotary cover plate. The supply port valve further includes an electric push rod. The electric push rod makes the rotary cover plate open the flue air supply port by pushing the push handle.

[0014] Further, define the heating flues from top to bottom as the first heating flue, the second heating flue... the nth heating flue, where n is a positive integer not less than 3. The flue is fixed at the right bottom of the furnace body, and the top height of the flue is not higher than the bottom height of the (n - 1)th heating flue.

[0015] Further, the gas inlet is located at the right end of the first heating flue. For odd-numbered flues, the temperature measuring element is located at the left end of the corresponding odd-numbered heating flue, and the gas replenishing pipe is located at the right end of the corresponding odd-numbered heating flue; for even-numbered flues, the temperature measuring element is located at the right end of the corresponding even-numbered heating flue, and the gas replenishing pipe is located at the left end of the corresponding even-numbered heating flue.

[0016] Further, the bottom of the flue is provided with flue legs.

[0017] The beneficial effects of the present invention are as follows: In the present invention, a temperature measuring element and a flue air supply opening are provided in each heating flue. The temperature measuring elements of each heating flue monitor the temperature of the corresponding heating flue in real time. For example, when the temperature of the bottommost heating flue is too high, the air supply opening valve corresponding to the bottommost heating flue can be opened, and the cold air only cools the bottommost heating flue, minimizing the impact on other heating flues as much as possible. However, inevitably, due to the influence of the cold air, the temperature of some heating flues may change. The corresponding temperature measuring elements monitor the temperature of the corresponding heating flues in real time. When the temperature of other heating flues is lower than the set value, the gas replenishing pipe of the corresponding heating flue can supply gas to the corresponding heating flue to increase the temperature of the corresponding heating flue, thereby realizing the independent control of the temperature of each heating flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention; Figure 2 is Figure 1 a side view of Figure 3 is Figure 1 an enlarged view of part A in Figure 4 is a schematic diagram showing the cooperation between the air supply opening valve and the flue air supply opening in Embodiment 1; Figure 5 is a schematic diagram showing the cooperation between the air supply opening valve and the flue air supply opening in Embodiment 2 of the present invention; 1. Gas inlet; 2. Furnace body; 3. First layer of heating flue; 4. Temperature measuring element; 5. Heat insulation and sealing cover; 6. Regulating valve actuator; 7. Flue air supply opening; 8. Main charging pipe; 9. Second layer of heating flue; 10. Furnace body partition; 11. Third layer of heating flue; 12. nth layer of heating flue; 13. Furnace body leg; 14. Flue; 15. Flue leg; 16. Gas charging pipe; 17. Flue connection opening; 18. Calcining pot; 19. Charging pipe valve; 20. Action output end of the regulating valve actuator; 21. Valve joint; 22. Regulating valve; 23. Rotary cover plate; 24. Push handle; 25. Electric push rod; 26. Steel frame; 27. Air pipe; 28. Fixed clamp; 29. Solenoid valve. Detailed implementation manners

[0019] To facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0020] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0021] An embodiment of the flue temperature control system of a pot-type calcining furnace in the present invention is as Figures 1 to 5 shown: It includes a plurality of heating flues arranged in sequence along the front-rear direction. There are two calcining pots 18 arranged at intervals left and right between adjacent heating flues, and the calcining pots are arranged vertically. The heating flue includes a furnace body 2. The bottom of the furnace body 2 is provided with furnace body legs 13. Inside the furnace body, multiple layers of heating flues arranged in an S shape and connected in sequence are formed from top to bottom. In this embodiment, there are a total of eight layers of heating flues from top to bottom, which are, from top to bottom, the first layer of heating flue 3, the second layer of heating flue 9, the third layer of heating flue 11... the nth layer of heating flue 12, where n is 8. The right end of the first layer of heating flue is connected to a gas inlet 1, and the right end of the eighth layer of heating flue is connected to a flue 14. The above all belong to the prior art and will not be elaborated here.

[0022] The innovation of the present invention lies in that in the present invention, temperature measuring elements 4 are provided in each layer of heating flues, and flue air supply openings 7 are also connected to each layer of heating flues. A supply air valve that can be opened or closed is provided at the flue air supply opening 7. The flue temperature control system further includes a gas supply system. The gas supply system includes gas supply pipes 16 that communicate with each layer of heating flues respectively. Feed pipe valves 19 are provided on each of the gas supply pipes 16. The gas supply pipes in the same column are connected to the same vertically arranged main feed pipe 8. The feed pipe valves are solenoid valves.

[0023] In this embodiment, a plurality of furnace body partitions 10 are provided in the inner cavity of the furnace body at intervals in the up and down direction. The furnace body partitions 10 divide the inner cavity of the furnace body into the heating flues. A flue communication opening 17 for communicating adjacent upper and lower layers of heating flues in the up and down direction is formed between the furnace body partition and the left or right side wall of the furnace body. The flue temperature control system further includes a flue communication opening adjusting device.

[0024] The flue communication opening adjusting device includes an adjusting valve 22 that is guided and movably assembled on the corresponding furnace wall in the left and right direction. The adjusting valve 22 is made of refractory plate material. The flue communication opening adjusting device further includes an adjusting valve actuator 6 arranged outside the furnace body corresponding to the adjusting valve. In this embodiment, the adjusting valve actuator 6 is an electric push rod. The action output end 20 of the adjusting valve actuator is connected to the adjusting valve. The adjusting valve moves towards the corresponding furnace body partition to reduce the opening size of the flue communication opening 17. When the adjusting valve moves away from the corresponding furnace body partition, the adjusting valve can retract into the inner wall of the furnace body. At this time, the adjusting valve is not directly located in the heating flue, reducing the heat received by the adjusting valve.

[0025] One side of the adjusting valve away from the furnace body is connected with a valve joint 21 through a dovetail groove. The valve joint 21 is a metal structure. The action output end 20 of the adjusting actuator is hinged to the valve joint through a hinge shaft. The hinge shaft connection here has two functions. One is to increase the freedom of movement in a relatively conventional way and avoid stress concentration. The other is to reduce the contact area between the action output end and the valve joint, so as to reduce the heat transmitted to the action output end through the valve joint and avoid overheating of the adjusting actuator.

[0026] A heat insulation and sealing cover 5 is provided outside the periphery of the valve joint. The heat insulation and sealing cover 5 is a hollow structure. The hollow inner cavity of the heat insulation and sealing cover is filled with heat insulation material. One end of the heat insulation and sealing cover 5 is fixed on the outer wall of the furnace body, and the other end of the heat insulation and sealing cover is in guiding and moving cooperation with the action output end of the adjusting valve actuator. The main body of the adjusting valve actuator is fixed on the steel frame ( Figure 1On the (not shown in the figure). The heat insulation and sealing cover 5 can reduce the heat loss problem caused by adjusting the gap between the regulating valve and the furnace body. At the same time, the heat insulation and sealing cover 5 also provides guidance for the movement of the action output end, avoiding the deviation of the action of the action output end, which may cause the regulating valve to not operate smoothly.

[0027] The regulating valve will be used in the following situations. For example, when the temperatures of all the heating flues below the third-layer heating flue are higher than the set value, the size of the flue communication port between the third-layer heating flue and the fourth-layer heating flue can be reduced by the regulating valve, and the gas supply to all the heating flues below the third-layer heating flue can be reduced, so as to reduce the temperatures of all the heating flues below the third-layer heating flue. When the temperature of only a certain layer of heating flue is too high, the temperature of the corresponding layer of heating flue can be reduced by only opening the flue air supply port of the corresponding layer of heating flue, and at the same time, pay attention to adjusting the temperatures of other layers of heating flues.

[0028] In the present invention, the flue is fixed to the right bottom of the furnace body. The bottom of the flue is provided with a flue support leg 15. The top height of the flue is not higher than the bottom height of the lowermost n-1 layer of heating flues. Therefore, the flue will not interfere with the setting of the corresponding temperature measuring element 4, the flue air supply port 7 and the gas supply pipe 16. Therefore, in the present invention, it can be set as follows: the gas inlet 1 is located at the right end of the first-layer heating flue. For the odd-numbered layer flues, the temperature measuring element 4 is located at the left end of the corresponding odd-numbered layer of heating flues, and the gas supply pipe 16 is located at the right end of the corresponding odd-numbered layer of heating flues; for the even-numbered layer flues, the temperature measuring element is located at the right end of the corresponding even-numbered layer of heating flues, and the gas supply pipe is located at the left end of the corresponding even-numbered layer of heating flues.

[0029] The advantage of such a setting is as follows: For example, when the right-end flue air supply port of the third-layer heating flue is opened, cold air enters through the third-layer heating flue and then moves from right to left. If the temperature measuring element of the third-layer heating flue is set at the right end of the third-layer heating flue, the cold air will easily affect the temperature measurement of the temperature measuring element, resulting in the temperature measuring element not being able to truly reflect the temperature of the third-layer heating flue; Similarly, when the feeding pipe valve of the third-layer heating flue needs to be opened to supply gas to the third-layer heating flue, the gas enters through the right end of the third-layer heating flue. After sufficient combustion along the entire length of the third-layer heating flue, the temperature measuring element of the third-layer heating flue measures the temperature at the left end of the third-layer heating flue, which also ensures the accuracy of temperature measurement.

[0030] The air supply port valve includes a rotatably assembled rotary cover plate 23, a push handle 24 is connected to the rotary cover plate 23, the air supply port valve further includes an electric push rod 25, the electric push rod 25 is installed on the steel frame 26 beside the furnace body, and the electric push rod 25 opens the flue air supply port 7 of the flue by pushing the push handle 24. When the electric push rod moves away from the push handle, the rotary cover 23 can flip by its own gravity to close the flue air supply port.

[0031] In actual use, a temperature threshold is set for each layer of heating flue. For example, the temperature thresholds are 980 °C and 1030 °C. When the temperature of the corresponding layer of heating flue is higher than 1030 °C, the flue air supply port of the corresponding layer of heating flue needs to be opened to introduce natural air (which can also be called cold air compared with the temperature inside the furnace) to cool the corresponding layer of heating flue. When the temperature is lower than 1030 °C, the flue air supply port of the corresponding layer of heating flue is closed; when the temperature of the corresponding layer of heating flue is lower than 980 °C, the gas supply pipe of the corresponding layer of heating flue needs to be opened for gas supplement. When the temperature of the corresponding layer of heating flue is higher than 980 °C, the gas supply pipe is closed; when the overall temperature of all the heating flues below a certain layer of heating flue is on the high side, the regulating valve 22 of the corresponding layer of heating flue needs to be adjusted to reduce the opening size of the corresponding flue connection port. If the designed temperature still cannot be reached, cooling is required through the flue air supply port of the corresponding layer; when the overall temperature of all the heating flues below a certain layer of heating flue is on the low side, the opening size of the corresponding flue connection port needs to be increased. If the designed temperature still cannot be reached, gas needs to be supplemented through the gas supply pipe of the corresponding layer. Ultimately, each layer of heating flue can be independently adjusted, so that the temperatures of the heating flues at various positions in the front-rear direction and at each layer in the height direction are all within the set temperature range.

[0032] An embodiment 2 of a flue temperature control system for a pot-type calciner, as Figure 5 shown. The difference between embodiment 2 and embodiment 1 is that in this embodiment, the air supply port valve is a solenoid valve 29. The solenoid valve is connected to the corresponding flue air supply port through an air pipe 27, and the air pipe is connected to the steel frame 26 beside the furnace body 2 through a fixing clamp 28.

[0033] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal connection of two components or the interaction relationship between two components. Therefore, unless clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0034] Based on the above description in this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0035] In addition, the terms "first" or "second" etc. used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flue temperature control system for a pot-type calciner, comprising at least two heating flues arranged in sequence in the front-rear direction, with a calcining pot between adjacent heating flues. The heating flue includes a furnace body, and multiple layers of heating flues arranged in an S-shape and communicating with each other in sequence are formed from top to bottom in the furnace body. A gas feed port is communicated with the uppermost layer of the heating flue, and a flue is communicated with the lowermost flue. It is characterized in that: Temperature measuring elements are provided in the heating flues of each layer. A flue air supply opening is also connected to each layer of heating flue. A supply air valve that can be opened or closed is provided at the flue air supply opening. The flue temperature control system further includes a gas feeding system. The gas feeding system includes gas feeding pipes that communicate with the heating flues of each layer respectively. A feeding pipe valve is provided on each gas feeding pipe.

2. The flue temperature control system according to claim 1, wherein: A plurality of furnace body partitions are provided at intervals in the vertical direction in the inner cavity of the furnace body. The furnace body partitions divide the inner cavity of the furnace body into the said heating flues. A flue communication opening for communicating the adjacent two layers of heating flues in the vertical direction is formed between the furnace body partition and the left or right side wall of the furnace body. The flue temperature control system further includes a flue communication opening adjusting device.

3. The flue temperature control system according to claim 2, characterized in that: The flue communication opening adjusting device includes an adjusting valve that is guided and movably assembled on the corresponding furnace wall in the left-right direction. The adjusting valve is made of refractory plate material. The flue communication opening adjusting device further includes an adjusting valve actuator arranged outside the furnace body and corresponding to the adjusting valve one by one. The action output end of the adjusting valve actuator is connected to the adjusting valve. The adjusting valve moves towards the corresponding furnace body partition to reduce the opening size of the flue communication opening.

4. The flue temperature control system according to claim 3, characterized in that: One end of the adjusting valve away from the furnace body is connected with a valve joint through a dovetail groove. The action output end of the adjusting valve actuator is hinged to the valve joint.

5. The flue temperature control system according to claim 4, wherein: A heat insulation and sealing cover is provided outside the periphery of the valve joint. One end of the heat insulation and sealing cover is fixed on the outer wall of the furnace body. The other end of the heat insulation and sealing cover is in guiding and moving cooperation with the action output end of the adjusting valve actuator.

6. The flue temperature control system according to claim 1, characterized in that: The supply air valve is a solenoid valve; or the supply air valve includes a rotatably assembled rotary cover plate. A push handle is connected to the rotary cover plate. The supply air valve further includes an electric push rod. The electric push rod opens the flue air supply opening by pushing the push handle.

7. The flue temperature control system according to any one of claims 1 to 6, characterized in that: Defined from top to bottom, the heating flues of each layer are respectively the first layer heating flue, the second layer heating flue... the nth layer heating flue, where n is a positive integer not less than 3. The flue is fixed at the right bottom of the furnace body. The top height of the flue is not higher than the bottom height of the (n - 1)th layer heating flue.

8. The flue temperature control system according to claim 7, wherein: The gas inlet is located at the right end of the first layer heating flue. For the odd-numbered layer flues, the temperature measuring element is located at the left end of the corresponding odd-numbered layer heating flue, and the gas feeding pipe is located at the right end of the corresponding odd-numbered layer heating flue; for the even-numbered layer flues, the temperature measuring element is located at the right end of the corresponding even-numbered layer heating flue, and the gas feeding pipe is located at the left end of the corresponding even-numbered layer heating flue.

9. The flue temperature control system according to claim 7, wherein: Flue legs are provided at the bottom of the flue.

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