Micro-positive pressure self-balancing device of closed furnace body

Abstract

The utility model provides a micro-positive pressure self-balancing device of a closed furnace body, which comprises a cabinet body shell, a water seal tank arranged on the inner side wall of the bottom of the cabinet body shell, a water seal floating valve arranged in the water seal tank, a balancing weight fixed on the top of the water seal floating valve, an air inlet pipe and an air outlet pipe arranged at the bottom end of the cabinet body shell, and a conical valve hung at the inner bottom end of the water seal floating valve, the conical valve is located at the air outlet pipe and expands or shrinks the section of the air outlet pipe along with the up-down movement of the water seal floating valve; the air outlet pipe is connected with the centrifugal fan, and the air inlet pipe can be communicated with the closed furnace body through the flue gas heat exchanger. The micro-positive pressure self-balancing device disclosed by the utility model realizes stable self-balancing adjustment of a micro-positive pressure environment in the closed furnace body.

Description

Technical Field

[0001] The utility model relates to the field of micro-positive pressure devices for closed furnaces, in particular to a micro-positive pressure self-balancing device for closed furnaces. Background Art

[0002] The micro-positive pressure environment is an environment in which the environmental pressure of the closed furnace body is 0pa-400pa of atmospheric pressure. The primary environment of the closed furnace body for smelting industrial silicon, ferroalloys, etc. is the micro-positive pressure in the furnace. Otherwise, once negative pressure is formed, air is sucked into the furnace, and the oxygen content in the coal gas increases, which is easy to cause explosions or even explosions. Excessive positive pressure will destroy the sealing of the furnace, and the damage to the sealing will be manifested as smoke and fire on the top of the furnace. The closed furnace body includes the furnace body of the electric arc furnace and the roasting furnace. The micro-positive pressure device currently used on the closed furnace body is achieved by adjusting the fan speed, but this micro-positive pressure environment is easily affected by voltage, power supply, etc., resulting in unstable control. Utility Model Content

[0003] In order to solve the problem in the prior art that the micro-positive pressure environment of a closed furnace body is easily affected and leads to unstable control, the utility model proposes a micro-positive pressure self-balancing device for a closed furnace body.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A micro-positive pressure self-balancing device for a closed furnace body comprises: a cabinet shell, a water seal groove is arranged at the inner side wall of the bottom, a water seal float valve is arranged in the water seal groove, a counterweight is fixed on the top of the water seal float valve, an air inlet pipe and an air outlet pipe are arranged at the bottom end of the cabinet shell, a conical valve is suspended at the inner bottom end of the water seal float valve, the conical valve is located at the air outlet pipe, and the cross-section of the air outlet pipe is expanded or reduced as the water seal float valve moves up and down; the air outlet pipe is connected to a centrifugal fan, and the air inlet pipe can be connected to the closed furnace body through a flue gas heat exchanger.

[0006] Preferably, a displacement sensor is provided on the inner side of the top end of the cabinet shell, and the displacement sensor is electrically connected to the centrifugal fan.

[0007] Preferably, the inlet of the flue gas heat exchanger is connected to the closed furnace body, the outlet is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the air inlet pipe.

[0008] Preferably, the centrifugal fan is connected to the emission incineration tower via a connecting pipeline, and the emission incineration tower is electrically connected to the displacement sensor.

[0009] Preferably, the emission incineration tower is connected to a gas turbine generator set, and the gas turbine generator set is electrically connected to the displacement sensor.

[0010] The beneficial effects of the utility model are as follows: the micro-positive pressure self-balancing device of the closed furnace body of the utility model is located on the outside of the closed furnace body, and utilizes the up and down floating of the water seal float valve in the cabinet shell in the water seal groove to drive the cross-section of the conical valve and the outlet pipe to cooperate, thereby expanding or contracting the gas flow rate exhausted at the outlet pipe, thereby realizing mechanical micro-positive pressure self-balancing, with stable structural operation and stable micro-positive pressure control, and can be safely used in the closed furnace body without being affected by other factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a structural schematic diagram of a micro-positive pressure self-balancing device of a closed furnace body of the utility model;

[0013] Figure 2 The utility model is a structural schematic diagram of the centrifugal fan connection of a micro-positive pressure self-balancing device of a closed furnace body.

[0014] In the figure:

[0015] 1. Cabinet shell; 2. Water seal groove; 3. Water seal float valve; 4. Counterweight; 5. Air inlet pipe; 6. Air outlet pipe; 7. Conical valve; 8. Centrifugal fan; 9. Dust collector; 10. Displacement sensor; 11. Gas turbine generator set; 12. Dispersion incineration tower; 13. Flue gas heat exchanger. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Example: Figure 1 and Figure 2The micro-positive pressure self-balancing device of the closed furnace shown comprises: a cabinet shell 1, a water seal groove 2 is arranged at the inner side wall of the bottom, a water seal float valve 3 is arranged in the water seal groove 2, a counterweight 4 is fixed on the top of the water seal float valve 3, an air inlet pipe 5 and an air outlet pipe 6 are arranged at the bottom end of the cabinet shell 1, a conical valve 7 is suspended at the inner bottom end of the water seal float valve 3, and the conical valve 7 is arranged at the air outlet pipe 6. As the water seal float valve 3 moves up and down, the cross section of the air outlet pipe 6 is expanded or reduced; the air outlet pipe 6 is connected to the centrifugal fan 8, the air inlet pipe 5 is connected to the dust collector 9, and the dust collector 9 is connected to the flue gas heat exchanger 13. The centrifugal fan 8 is connected to the venting incineration tower 12 through a connecting pipeline, and the venting incineration tower 12 is connected to the gas turbine generator set 11.

[0018] A displacement sensor 10 is provided on the inner side of the top of the cabinet shell 1. The displacement sensor 10 is electrically connected to the centrifugal fan 8, the gas turbine generator set 11 and the emission incineration tower 12 respectively to control the rotation speed of the centrifugal fan and the start and stop of the gas turbine generator set and the emission incineration tower.

[0019] The water seal float valve is an existing structure. In the utility model, the water seal float valve is combined with a counterweight block and a conical valve to float up and down in the water seal groove, thereby adjusting the flow rate of the exhaust gas at the outlet pipe of the cabinet shell, thereby realizing automatic adjustment of the micro-positive pressure environment in the closed furnace body.

[0020] The temperature inside the closed furnace body can be high, and the air inlet pipe 5 can be connected to the closed furnace body through the flue gas heat exchanger, which saves energy and reduces consumption. The temperature inside the closed furnace body is not high, and the air inlet pipe can be directly connected to the closed furnace body. The air inlet pipe can be connected to the closed furnace body through the flue gas heat exchanger, which also means that the air inlet pipe can be directly connected to the closed furnace body.

[0021] The closed furnace body is explained by taking the ore-heating furnace as an example. The slight positive pressure inside the cabinet shell 1 is achieved by the displacement of the water seal float valve 3 and the negative pressure of the centrifugal fan 8. The gas in the ore-heating furnace is cooled by the flue gas heat exchanger and then enters the dust collector for dust removal. The dust-removed gas enters the bottom of the water seal float valve in the cabinet shell through the air inlet pipe. When the positive pressure in the ore-heating furnace decreases, the water seal float valve 3 moves down, and the conical valve 7 suspended on the water seal float valve moves down synchronously, so that the pipe mouth section of the outlet pipe 6 is sealed, and the gas generated by the ore-heating furnace is no longer The pressure in the furnace rises with the pumping; as the pressure in the furnace rises, the conical valve 7 suspended on the water seal float valve rises synchronously, so that the pipe mouth section of the gas outlet pipe 6 gradually increases, and the flow rate of the pumped gas gradually increases, so that a slight positive pressure is maintained in the furnace; when the positive pressure in the furnace rises, the water seal float valve 3 moves upward, and the conical valve 7 suspended on it moves upward synchronously, so that the pipe mouth section of the gas outlet pipe 6 becomes larger, and the flow rate of the pumped gas increases, the pressure in the furnace drops, and the slight positive pressure is stably maintained in the furnace.

[0022] A displacement sensor is provided on the top of the cabinet shell to monitor the displacement of the water seal float valve in real time. The displacement sensor controls the speed of the centrifugal fan and the start and stop of the gas turbine generator set and the emission incineration tower respectively, adjusts the wind pressure of the centrifugal fan in real time, and adjusts the flow rate of gas extraction at the outlet pipe. At the same time, through the dual adjustment of the wind pressure of the water seal float valve and the centrifugal fan, the micro-positive pressure environment inside the ore-fired furnace is guaranteed to ensure safe operation.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-positive pressure self-balancing device for a closed furnace, characterized in that: include: The cabinet shell is provided with a water seal groove on the inner wall of the bottom, a water seal float valve is provided in the water seal groove, a counterweight is fixed on the top of the water seal float valve, an air inlet pipe and an air outlet pipe are provided at the bottom end of the cabinet shell, a conical valve is suspended at the inner bottom end of the water seal float valve, the conical valve is located at the air outlet pipe, and the cross-section of the air outlet pipe is expanded or reduced as the water seal float valve moves up and down; the air outlet pipe is connected to the centrifugal fan, and the air inlet pipe can be connected to the closed furnace body through the flue gas heat exchanger.

2. The micro-positive pressure self-balancing device of a closed furnace according to claim 1, characterized in that: A displacement sensor is arranged on the inner side of the top end of the cabinet shell, and the displacement sensor is electrically connected to the centrifugal fan.

3. The micro-positive pressure self-balancing device of a closed furnace according to claim 1, characterized in that: The inlet of the flue gas heat exchanger is connected to the closed furnace body, the outlet is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the air inlet pipe.

4. The micro-positive pressure self-balancing device of a closed furnace according to claim 1, characterized in that: The centrifugal fan is connected to the emission incineration tower through a connecting pipeline, and the emission incineration tower is electrically connected to the displacement sensor.

5. The micro-positive pressure self-balancing device of a closed furnace according to claim 4, characterized in that: The emission incineration tower is connected to the gas turbine generator set, and the gas turbine generator set is electrically connected to the displacement sensor.

Images