Pressure maintaining device of calcining furnace

Abstract

The utility model relates to the technical field of calcining furnace pressure maintaining, in particular to a calcining furnace pressure maintaining device which comprises a supporting frame, a bottom plate is fixedly installed at one end of the long side edge of the bottom of the supporting frame, a fan is installed at the top of the bottom plate, and an air inlet of the fan is connected with an air pipe. According to the pressure maintaining device for the calcining furnace, the pressure value in the hearth is monitored through the pressure sensor, the minimum pressure value and the normal pressure value are set through the controller, when the minimum pressure value in the hearth is reached, the electric control valve is closed, the electric air door valve is opened by the maximum angle, and the normal pressure value is set through the controller. The air inlet amount in the hearth is increased, the positive pressure value in the hearth is rapidly increased, when the normal positive pressure value is reached, the electric control valve is opened, and the chimney normally exhausts waste gas, so that the pressure maintaining effect on the internal pressure of the calcining furnace is achieved, waste gas and dust in the furnace are effectively exhausted, accumulation of dust or toxic gas is prevented, and harm to the environment and health is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of calcining furnace pressure maintenance, in particular to a calcining furnace pressure maintenance device. Background Art

[0002] A calcining furnace is a thermal equipment that heat treats carbon raw materials (such as coke, anthracite, etc.) at high temperatures to improve the properties of raw materials. It is used for ironmaking, recycling rare metals, catalyst production, environmental improvement, and production of special chemicals. During the calcining process, the reasons for the positive and negative pressures in the calcining furnace are mainly related to the fluidity of the gas and the state of the pressure in the furnace. A large amount of gas will be generated during calcination, and these gases will affect the pressure in the furnace. When the pressure in the furnace is higher than the atmospheric pressure, it is a positive pressure state. At this time, the gas will promote the flow of materials, maintain the fluidity of the gas and unobstructed discharge. This can effectively discharge the waste gas and dust in the furnace, prevent the accumulation of dust or toxic gases, and reduce the harm to the environment and health. On the contrary, when the pressure in the furnace is lower than the atmospheric pressure, it is a negative pressure state. At this time, the gas in the furnace is easy to inhale the outside air from the gap, resulting in incomplete combustion, increased heat loss, reduced efficiency, and possible safety risks. In addition, a large amount of oxygen in the air may enter the furnace, causing the combustion to be out of control, resulting in high-temperature combustion and even explosion danger.

[0003] Therefore, in order to ensure the safe, stable and efficient operation of the calcining furnace, it is necessary to maintain a positive pressure state in the furnace.

[0004] In summary, the utility model solves the existing problems by designing a calcining furnace pressure maintaining device. Utility Model Content

[0005] The purpose of the utility model is to provide a calcining furnace pressure maintaining device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A calcining furnace pressure-maintaining device comprises a support frame, a bottom plate is fixedly mounted on one end of a longer side of the bottom of the support frame, a fan is mounted on the top of the bottom plate, an air inlet of the fan is connected to an air duct, an electric damper valve is sleeved and mounted on the outer ring surface of the air duct, and one end of the outer ring surface of the electric damper valve is connected to the support plate;

[0008] A furnace is installed on the top of the support frame, a controller is installed on the outer side of the furnace, a pressure sensor is installed at one end of the top of the furnace, a pressure gauge is installed on the top of the pressure sensor, a chimney is installed at the center of the top of the furnace, and an electric-controlled valve is installed at the node of the chimney.

[0009] As a preferred solution of the utility model, the fan, electric damper valve, pressure sensor and electronically controlled valve are all electrically connected to the controller, and the fan is connected to the furnace through an air duct, and one end of the air duct is connected to the interior of the furnace.

[0010] As a preferred solution of the utility model, the air duct is divided into two sections, and one end of the two sections of the air duct is respectively connected to the top and bottom of the electric damper valve, and one end of the support plate on the electric damper valve is fixedly mounted on the support frame.

[0011] As a preferred solution of the utility model, one end of the pressure sensor for detecting pressure is located inside the furnace, and the pressure value detected by the pressure sensor is displayed by a pressure gauge, and the pressure sensor is threadedly connected to the top of the furnace.

[0012] As a preferred solution of the utility model, one end of the chimney is communicated with the interior of the furnace, and the other end of the chimney is sealed and connected to the smoke exhaust pipe by bolts.

[0013] As a preferred solution of the utility model, the top and the bottom of the electric control valve are respectively connected to the two end nodes of the chimney, and the electric control valve is automatically closed when the pressure inside the furnace is negative.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. In the utility model, a calcining furnace pressure maintaining device is designed, a pressure sensor is used to monitor the pressure value in the furnace, and the minimum pressure value and the normal pressure value are set by the controller. When the minimum pressure value is reached in the furnace, the electric control valve is closed, and the electric damper valve is opened to the maximum angle, the air intake in the furnace is increased to rapidly increase the internal positive pressure value, and when the normal positive pressure value is reached, the electric control valve is opened, and the chimney is normally exhausted to exhaust the exhaust gas, thereby achieving the pressure maintaining effect of the internal pressure of the calcining furnace, effectively exhausting the exhaust gas and dust in the furnace, preventing the accumulation of dust or toxic gases, and reducing the harm to the environment and health. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the air inlet assembly of the utility model;

[0018] Figure 3 This is a schematic diagram of the furnace and its components of the utility model.

[0019] In the figure: 1. support frame; 2. base plate; 3. fan; 4. air duct; 5. electric damper valve; 6. support plate; 7. furnace; 8. controller; 9. pressure sensor; 10. pressure gauge; 11. chimney; 12. electric control valve. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0024] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0025] A calcining furnace pressure-maintaining device comprises a support frame 1, a bottom plate 2 is fixedly mounted on one end of a longer side of the bottom of the support frame 1, a fan 3 is mounted on the top of the bottom plate 2, an air inlet of the fan 3 is connected to an air duct 4, an electric damper valve 5 is sleeved and mounted on the outer ring surface of the air duct 4, and one end of the outer ring surface of the electric damper valve 5 is connected to a support plate 6;

[0026] A furnace 7 is installed on the top of the support frame 1, a controller 8 is installed on the outer side of the furnace 7, a pressure sensor 9 is installed at one end of the top of the furnace 7, a pressure gauge 10 is installed on the top of the pressure sensor 9, a chimney 11 is installed at the top center of the furnace 7, and an electric-controlled valve 12 is installed at the node of the chimney 11.

[0027] For example, please refer to Figure 1 , Figure 2 and Figure 3 The fan 3, the electric damper valve 5, the pressure sensor 9 and the electric control valve 12 are all electrically connected to the controller 8, and the fan 3 is connected to the furnace 7 through the air duct 4, one end of the air duct 4 is connected to the interior of the furnace 7, the fan 3 introduces outside air into the air duct 4, and the air duct 4 injects outside air into the interior of the furnace 7. The air duct 4 is divided into two sections, and one end of the two sections of the air duct 4 is respectively connected to the top and the bottom of the electric damper valve 5. One end of the support plate 6 on the electric damper valve 5 is fixedly installed on the support frame 1. The larger the opening angle of the electric damper valve 5, the greater the air volume input by the air duct 4 to the interior of the furnace 7, and vice versa. The smaller the air volume input by the air duct 4 to the furnace 7 is.

[0028] For example, please refer to Figure 1 and Figure 3 , one end of the pressure sensor 9 for detecting pressure is located inside the furnace 7, and the pressure value detected by the pressure sensor 9 is displayed by a pressure gauge 10. The pressure sensor 9 is threadedly connected to the top of the furnace 7. The pressure sensor 9 is made of high-temperature resistant material and can withstand the high temperature inside the furnace 7 without affecting its function. One end of the chimney 11 is connected to the inside of the furnace 7, and the other end of the chimney 11 is sealed and connected to the smoke exhaust pipe by bolts. The waste generated by calcination inside the furnace 7, the flue gas is discharged into the smoke exhaust pipe through the chimney 11 under the positive pressure inside the furnace 7. The top and bottom of the electric control valve 12 are respectively connected to the two end nodes of the chimney 11, and the electric control valve 12 is automatically closed when the inside of the furnace 7 is negative pressure. The positive pressure value for opening the electric control valve 12 can be set on the controller 8. When the pressure value inside the furnace 7 reaches the set positive pressure value, the electric control valve 12 automatically opens.

[0029] The working process of the utility model: a calcining furnace pressure maintaining device designed by the present invention is used. During the use of the calcining furnace, the minimum positive pressure value and the normal positive pressure value are first set on the controller 8. The pressure sensor 9 monitors the pressure inside the furnace 7 in real time and displays it through the pressure gauge 10. When it is detected that the pressure inside the furnace 7 reaches the set minimum positive pressure value, the electric control valve 12 automatically switches. At this time, the chimney 11 is in a closed state to prevent the negative pressure state from being reached and the outside air is sucked back. In addition, the electric damper valve 5 is opened to the maximum angle at this time, and the air volume input by the fan 3 to the furnace 7 through the air duct 4 is increased, so that the air intake volume is quickly greater than the exhaust volume. This is because the furnace 7 will gradually increase the positive pressure value. When the positive pressure value increases to the set normal positive pressure value, the electric damper valve 5 automatically returns to the original opening and closing size, and the electric control valve 12 automatically opens, and the chimney 11 is discharged normally. The above process is repeated, thereby achieving the pressure maintaining effect of the internal pressure of the calcining furnace, effectively discharging the exhaust gas and dust in the furnace, preventing the accumulation of dust or toxic gases, and reducing the harm to the environment and health.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calcining furnace pressure-maintaining device, comprising a support frame (1), characterized in that: A bottom plate (2) is fixedly mounted on one end of a longer side of the bottom of the support frame (1); a fan (3) is mounted on the top of the bottom plate (2); an air inlet of the fan (3) is connected to an air duct (4); an electric damper valve (5) is sleeved and mounted on the outer ring surface of the air duct (4); and one end of the outer ring surface of the electric damper valve (5) is connected to a support plate (6); A furnace (7) is installed on the top of the support frame (1), a controller (8) is installed on the outer side of the furnace (7), a pressure sensor (9) is installed at one end of the top of the furnace (7), a pressure gauge (10) is installed on the top of the pressure sensor (9), a chimney (11) is installed at the center of the top of the furnace (7), and an electric control valve (12) is installed at the node of the chimney (11).

2. A calcining furnace pressure-maintaining device according to claim 1, characterized in that: The fan (3), the electric damper valve (5), the pressure sensor (9) and the electric control valve (12) are all electrically connected to the controller (8), and the fan (3) is connected to the furnace (7) via an air duct (4), and one end of the air duct (4) is in communication with the interior of the furnace (7).

3. The calcining furnace pressure maintaining device according to claim 1, characterized in that: The air duct (4) is divided into two sections, and one end of the two sections of the air duct (4) is respectively connected to the top and the bottom of the electric damper valve (5), and one end of the support plate (6) on the electric damper valve (5) is fixedly mounted on the support frame (1).

4. The calcining furnace pressure maintaining device according to claim 1, characterized in that: One end of the pressure sensor (9) for detecting pressure is located inside the furnace (7), and the pressure value detected by the pressure sensor (9) is displayed by a pressure gauge (10). The pressure sensor (9) is threadedly connected to the top of the furnace (7).

5. The calcining furnace pressure maintaining device according to claim 1, characterized in that: One end of the chimney (11) is communicated with the interior of the furnace (7), and the other end of the chimney (11) is sealed and connected to the smoke exhaust pipe via bolts.

6. The calcining furnace pressure maintaining device according to claim 1, characterized in that: The top and bottom of the electric control valve (12) are respectively connected to the two end nodes of the chimney (11), and the electric control valve (12) is automatically closed when the inside of the furnace (7) is under negative pressure.

Images