A melting trough, a composite pulse type blowing and suction ventilation system and an air supply device

Abstract

The present invention provides a smelting tank, a composite pulse blowing and suction ventilation system and a air supply device. The open top of the main body of the smelting tank is a high-temperature flue gas generation port. An air supply device is arranged above one side of the high-temperature flue gas generation port, and an exhaust device is arranged on the other side of the high-temperature flue gas generation port. Through the air supply device of the ventilation system, the present invention can axially combine a high-speed pulsed air flow with a static pressure low-speed air flow. Due to the difference in velocity gradient and periodic fluctuation between the high-speed pulsed air flow and the surrounding static pressure low-speed air flow, the high-speed pulsed air flow can effectively induce the static pressure low-speed air flow to flow along the direction of controlling the high-temperature flue gas, transport the high-temperature flue gas generated by the smelting tank to the exhaust device, and achieve efficient capture of the high-temperature flue gas. Since the outlet duct diameter of the high-speed pulsed air flow is small and the air volume is small, energy conservation and emission reduction can be achieved while efficiently capturing the high-temperature flue gas.

Description

Technical Field

[0001] The present invention belongs to the field of air ventilation, relates to a blowing and suction ventilation system, and particularly relates to a smelting tank, a composite pulse type blowing and suction ventilation system and an air supply device. Background Art

[0002] When smelting non-ferrous metals, it is necessary to first remove the impurities contained in the ore and then extract and recover the non-ferrous metals. During the process of removing impurities from the ore, a large amount of harmful gases are usually generated. For example, during the smelting process of metallic lead, in order to remove impurities such as copper, arsenic, tin, etc., the crude lead needs to be melted and heated to 400 - 600 °C. At this temperature, lead and its compounds are very easy to overflow in the form of steam. At the same time, due to various operations such as feeding, a large amount of particulate matter with a size of 0.01 - 1 μm is also generated. The flue gas mainly composed of high-temperature gaseous pollutants and particulate matter will cause great harm to the occupational health of workers. Therefore, it is necessary to adopt a ventilation method to control the harmful gases.

[0003] Currently, a side suction exhaust hood is often used to control harmful gases. However, since the suction speed decays exponentially with the increase of the distance from the suction hood opening, and in actual production, there are often multiple operations such as feeding, stirring, and slag skimming, the side suction exhaust hood cannot act on the entire smelting tank, resulting in poor control effect on pollutants. When using a traditional blowing and suction ventilation system, although the pollutant can be effectively transported to the exhaust port by the air supply jet, since the traditional blowing and suction ventilation system is only designed for a smelting tank with a pollution source temperature lower than 100 °C, the air supply power is insufficient and it cannot effectively suppress and transport the high-temperature flue gas. Therefore, the traditional blowing and suction ventilation system has a poor capture efficiency for high-temperature flue gas pollutants. If the air supply volume is directly increased on the basis of the traditional blowing and suction ventilation system, it will lead to a significant increase in the exhaust energy consumption, which is not conducive to energy conservation and emission reduction.

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a smelting tank, a composite pulse type blowing and suction ventilation system and an air supply device, so as to solve the technical problem that it is difficult for the existing ventilation system to take into account the efficient capture of high-temperature flue gas and energy conservation and emission reduction.

[0005] The present invention is realized by adopting the following technical solutions:

[0006] A smelting tank includes a smelting tank main body, and the open top end of the smelting tank main body is a high-temperature flue gas generation port; the smelting tank is provided with a composite pulse type blowing and suction ventilation system, and the composite pulse type blowing and suction ventilation system includes an air supply device and an exhaust device;

[0007] An air supply device is arranged above the upper side of the high-temperature flue gas generation port in the horizontal direction, and an exhaust device is arranged on the other side in the horizontal direction of the high-temperature flue gas generation port. The exhaust device is arranged on the top of the other side in the horizontal direction of the smelting tank main body;

[0008] The described air supply device is used to send out high-speed pulsed airflows and static pressure low-speed airflows. The speed of the high-speed pulsed airflow is greater than that of the static pressure low-speed airflow, and the maximum speed difference between the high-speed pulsed airflow and the static pressure low-speed airflow is 5 m / s to 10 m / s;

[0009] The speed V of the high-speed pulsed airflow R As shown in Formula I:

[0010] V R＝ 25 + 3sin 0.5πt Formula I;

[0011] In Formula I:

[0012] V R represents the speed of the high-speed pulsed airflow;

[0013] t represents the air supply time of the high-speed pulsed airflow.

[0014] The present invention also has the following technical features:

[0015] The described air supply device includes a blower static pressure box, which is connected to a blower. A high-speed pulsed airflow pipe is arranged inside the top of the blower static pressure box;

[0016] One lateral end of the high-speed pulsed airflow pipe extends out of the other lateral side of the blower static pressure box. An air-driven pulse generator is arranged on the high-speed pulsed airflow pipe outside the other lateral side of the blower static pressure box; A low-speed airflow supply pipe is arranged on the other lateral side of the blower static pressure box, and the low-speed airflow supply pipe is located above one lateral side of the high-temperature flue gas generation port;

[0017] The other lateral end of the high-speed pulsed airflow pipe penetrates through the blower static pressure box and the low-speed airflow supply pipe. The other lateral end of the high-speed pulsed airflow pipe is flush with the other lateral end of the low-speed airflow supply pipe, and the high-speed pulsed airflow pipe and the low-speed airflow supply pipe are coaxially arranged;

[0018] The described exhaust device includes an exhaust hood. One lateral side of the exhaust hood is arranged on the top of the other lateral side of the melting tank main body. One lateral side of the exhaust hood is arranged opposite to the other lateral end of the low-speed airflow supply pipe; The other lateral end of the exhaust hood is communicated with an exhaust pipe;

[0019] The bottom of the blower static pressure box is provided with a low-speed airflow inlet. The other lateral end of the low-speed airflow supply pipe is a static pressure low-speed airflow supply port; One lateral end of the high-speed pulsed airflow pipe is an airflow to be processed inlet, and the other lateral end of the high-speed pulsed airflow pipe is a high-speed pulsed airflow supply port;

[0020] One lateral end of the exhaust hood is the high-temperature flue gas suction inlet, which is located above the side of the high-temperature flue gas generation port. One end of the exhaust duct is connected to the exhaust hood, and the other end of the exhaust duct is the high-temperature flue gas discharge outlet;

[0021] The low-speed air flow is introduced into the static pressure box of the air blower from the low-speed air flow inlet. The low-speed air flow is converted into a static pressure low-speed air flow under the treatment of the static pressure box of the air blower. The static pressure low-speed air flow flows out from the static pressure low-speed air duct through the static pressure low-speed air flow outlet;

[0022] The air flow to be treated is introduced into the high-speed pulse air duct from the air flow inlet to be treated. When the air flow to be treated passes through the pneumatic pulse generator, it is converted into a high-speed pulse air flow under the treatment of the pneumatic pulse generator. The high-speed pulse air flow flows out from the high-speed pulse air flow outlet;

[0023] Under the push of the static pressure low-speed air flow and the high-speed pulse air flow, the high-temperature flue gas generated from the high-temperature flue gas generation port will flow into the exhaust hood from the high-temperature flue gas suction inlet, pass through the exhaust duct and finally flow out from the high-temperature flue gas discharge outlet.

[0024] The distance between the static pressure low-speed air flow outlet and the high-temperature flue gas suction inlet is L, and the pipe diameter D of the low-speed air duct is 0.03L - 0.05L;

[0025] The pipe diameter d of the high-speed pulse air duct is 0.2D - 0.1D;

[0026] The distance H between the bottom surface of the low-speed air duct and the high-temperature flue gas generation port is 2D - 4D.

[0027] On the inner wall of the low-speed air duct, there are upper rectifying orifice plate fixing grooves and lower rectifying orifice plate fixing grooves, which are arranged oppositely;

[0028] In the low-speed air duct, there is a rectifying orifice plate, which is arranged vertically. The top and bottom of the rectifying orifice plate are respectively clamped in the upper rectifying orifice plate fixing groove and the lower rectifying orifice plate fixing groove; a high-speed pulse air duct through hole is opened at the center of the rectifying orifice plate, and the lateral other end of the high-speed pulse air duct is arranged in the high-speed pulse air duct through hole.

[0029] The distance L between the rectifying orifice plate and the static pressure low-speed air flow outlet 1 is 2D - 4D; the opening ratio of the rectifying orifice plate is 35% - 45%, and the opening diameter of the rectifying orifice plate is 0.02D - 0.05D.

[0030] An air supply duct for low-speed air flow at the top of the fixed card slot of the upper rectifying orifice plate is provided with a rectifying orifice plate replacement opening, on which a sealing cover plate is covered, and a cover plate handle is arranged on the top surface of the sealing cover plate.

[0031] The high-speed pulsed air flow pipe is fixedly arranged inside the top of the static pressure box of the air blower through a pulsed wire clip.

[0032] A plurality of guide grilles are arranged inside one lateral side of the exhaust hood.

[0033] The present invention also protects a composite pulsed blow-suction ventilation system as described above.

[0034] The present invention also protects an air supply device as described above.

[0035] Compared with the prior art, the present invention has the following technical effects:

[0036] The smelting tank of the present invention is provided with a composite pulsed blow-suction ventilation system. The air supply device of this ventilation system can axially combine high-speed pulsed air flow with static pressure low-speed air flow. Due to the difference in velocity gradient and periodic fluctuation between the high-speed pulsed air flow and the surrounding static pressure low-speed air flow, the high-speed pulsed air flow can effectively induce the static pressure low-speed air flow to flow along the direction of controlling the high-temperature flue gas, and transport the high-temperature flue gas generated by the smelting tank to the exhaust device of this system, realizing the efficient capture of the high-temperature flue gas. Since the air outlet pipe diameter of the high-speed pulsed air flow is small and the air volume is small, energy conservation and emission reduction can be achieved while efficiently capturing the high-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of a smelting tank with a composite pulsed blow-suction ventilation system.

[0038] Figure 2 It is a schematic diagram of the parameters of a smelting tank with a composite pulsed blow-suction ventilation system.

[0039] Figure 3 It is a schematic diagram of the air supply device of a composite pulsed blow-suction ventilation system.

[0040] Figure 4 It is a schematic diagram of a rectifying orifice plate.

[0041] Figure 5 It is a schematic diagram of an exhaust device.

[0042] Figure 6 It is a cross-sectional view of the A-A' plane of the exhaust device.

[0043] Figure 7(A) is a schematic diagram of a single-pulse ventilation system.

[0044] Figure 7(B) is a schematic diagram of a low-speed blow-suction ventilation system.

[0045] Figure 7(C) is a schematic diagram of the composite pulse type blowing and suction ventilation system.

[0046] Figure 8(A) is the control effect diagram of the single pulse ventilation system on pollutants.

[0047] Figure 8(B) is the control effect diagram of the low-speed blowing and suction ventilation system on pollutants.

[0048] Figure 8(C) is the control effect diagram of the composite pulse type blowing and suction ventilation system on pollutants.

[0049] The meanings of each label in the figure are as follows: 1 - smelting tank, 2 - air supply device, 3 - exhaust device, 4 - high-speed pulsed air flow, 5 - static pressure low-speed air flow, 6 - low-speed air flow, 7 - air flow to be treated, 8 - high-temperature flue gas;

[0050] 101 - main body of the smelting tank, 102 - high-temperature flue gas generation port;

[0051] 201 - static pressure box of the air blower, 202 - high-speed pulsed air flow pipe, 203 - pneumatic pulse generator, 204 - low-speed air flow supply pipe, 205 - low-speed air flow inlet, 206 - static pressure low-speed air flow supply port, 207 - air flow to be treated inlet, 208 - high-speed pulsed air flow supply port, 209 - fixing slot for the upper rectifying orifice plate, 210 - fixing slot for the lower rectifying orifice plate, 211 - rectifying orifice plate, 212 - through hole of the high-speed pulsed air flow pipe, 213 - rectifying orifice plate replacement port, 214 - sealing cover plate, 215 - cover plate handle, 216 - pulsed wire clip;

[0052] 301 - exhaust hood, 302 - exhaust pipe, 303 - high-temperature flue gas suction port, 304 - high-temperature flue gas discharge port, 305 - flow guiding grid.

[0053] The following further explains the specific content of the present invention in detail in combination with embodiments. Specific implementation manners

[0054] It should be noted that all the machines in the present invention, without special instructions, are machines known in the art. For example, the air blower adopts the air blower known in the prior art, and the pneumatic pulse generator adopts the pneumatic pulse generator known in the prior art.

[0055] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0056] Embodiment 1:

[0057] This embodiment provides an air supply device, such as Figures 1 to 4As shown in the figure, it includes a blower static pressure box 201, the blower static pressure box 201 is connected to a blower, and a high-speed pulsed air flow pipe 202 is arranged inside the top of the blower static pressure box 201.

[0058] One lateral end of the high-speed pulsed air flow pipe 202 extends out of the other lateral side of the blower static pressure box 201, and a pneumatic pulse generator 203 is arranged on the high-speed pulsed air flow pipe 202 located outside the other lateral side of the blower static pressure box 201; a low-speed air flow supply pipe 204 is arranged on the other lateral side of the blower static pressure box 201.

[0059] The other lateral end of the high-speed pulsed air flow pipe 202 penetrates through the blower static pressure box 201 and the low-speed air flow supply pipe 204, the other lateral end of the high-speed pulsed air flow pipe 202 is flush with the other lateral end of the low-speed air flow supply pipe 204, and the high-speed pulsed air flow pipe 202 and the low-speed air flow supply pipe 204 are coaxially arranged.

[0060] As a specific scheme of this embodiment, an upper rectifying orifice plate fixing slot 209 and a lower rectifying orifice plate fixing slot 210 are arranged on the inner wall of the low-speed air flow supply pipe 204, and the upper rectifying orifice plate fixing slot 209 and the lower rectifying orifice plate fixing slot 210 are arranged oppositely.

[0061] A rectifying orifice plate 211 is arranged inside the low-speed air flow supply pipe 204, the rectifying orifice plate 211 is arranged vertically, the top and bottom of the rectifying orifice plate 211 are respectively clamped in the upper rectifying orifice plate fixing slot 209 and the lower rectifying orifice plate fixing slot 210; a high-speed pulsed air flow pipe through hole 212 is opened at the center of the rectifying orifice plate 211, and the other lateral end of the high-speed pulsed air flow pipe 202 is arranged inside the high-speed pulsed air flow pipe through hole 212.

[0062] In this embodiment, the upper rectifying orifice plate fixing slot 209 and the lower rectifying orifice plate fixing slot 210 are welded on the inner wall of the low-speed air flow supply pipe 204; the rectifying orifice plate 211 can adjust the air outlet turbulence degree of the air supply device 2, so that the air outlet is uniform.

[0063] As a specific scheme of this embodiment, a rectifying orifice plate extraction port 213 is opened on the low-speed air flow supply pipe 204 at the top end of the upper rectifying orifice plate fixing slot 209, a sealing cover plate 214 is covered on the rectifying orifice plate extraction port 213, a cover plate handle 215 is arranged on the top surface of the sealing cover plate 214, and the rectifying orifice plate 211 can be flexibly extracted and replaced by opening the sealing cover plate 214.

[0064] As a specific scheme of this embodiment, the high-speed pulsed air flow pipe 202 is fixedly arranged inside the top of the blower static pressure box 201 through a pulsed wire clip 216, and the pulsed wire clip 216 can ensure the stable fixation of the high-speed pulsed air flow pipe 202.

[0065] Embodiment 2:

[0066] This embodiment provides a compound pulse blowing and suction ventilation system, which includes a air supply device 2 and an exhaust device 3.

[0067] In this embodiment, the air supply device 2 adopts the air supply device in Embodiment 1.

[0068] The exhaust device 3 includes an exhaust hood 301. The transverse side of the exhaust hood 301 is oppositely arranged to the transverse other end of the low-speed air delivery pipe 204; the transverse other end of the exhaust hood 301 is communicated with an exhaust pipe 302.

[0069] As a specific solution of this embodiment, a plurality of flow guiding grilles 305 are arranged inside the transverse side of the exhaust hood 301. In this embodiment, the number of the flow guiding grilles 305 is at least 8. The flow guiding grilles 305 extend more than 150 mm along the air flow transportation direction. The flow guiding grilles 305 are parallel to the air flow transportation direction. The flow guiding grilles 305 contribute to uniform air suction, and thus can improve the control effect of pollutants.

[0070] Embodiment 3:

[0071] This embodiment provides a smelting tank, as Figures 1 to 6 shown. The smelting tank 1 includes a smelting tank main body 101. The open top end of the smelting tank main body 101 is a high-temperature flue gas generation port 102; the smelting tank 1 is equipped with a compound pulse blowing and suction ventilation system, and the compound pulse blowing and suction ventilation system adopts the compound pulse blowing and suction ventilation system given in Embodiment 2.

[0072] An air supply device 2 is arranged above the transverse side of the high-temperature flue gas generation port 102, and an exhaust device 3 is arranged on the transverse other side of the high-temperature flue gas generation port 102. The exhaust device 3 is arranged on the top of the transverse other side of the smelting tank main body 101.

[0073] The air supply device 2 is used to send out a high-speed pulsed air flow 4 and a static pressure low-speed air flow 5. The speed of the high-speed pulsed air flow 4 is greater than the speed of the static pressure low-speed air flow 5. The maximum speed difference between the high-speed pulsed air flow 4 and the static pressure low-speed air flow 5 is 5 m / s to 10 m / s.

[0074] The speed V of the high-speed pulsed air flow R As shown in Formula I:

[0075] V R＝ 25 + 3sin 0.5πt Formula I;

[0076] In Formula I:

[0077] V R represents the speed of the high-speed pulsed air flow;

[0078] t represents the air supply time of the high-speed pulsed air flow.

[0079] In this embodiment, the high-speed pulsed air flow 4 can effectively induce the static-pressure low-speed air flow 5 to flow along the direction of controlling pollutants, thereby improving the control effect of pollutants.

[0080] As a specific solution of this embodiment, a low-speed air inlet 205 is provided at the bottom of the blower static pressure box 201, and the other lateral end of the low-speed air supply duct 204 is a static-pressure low-speed air supply port 206; one lateral end of the high-speed pulsed air flow pipe 202 is a gas to be treated inlet 207, and the other lateral end of the high-speed pulsed air flow pipe 202 is a high-speed pulsed air supply port 208; one lateral end of the exhaust hood 301 is a high-temperature flue gas suction port 303, the high-temperature flue gas suction port 303 is located above the side of the high-temperature flue gas generation port 102, and one end of the exhaust duct 302 is connected to the exhaust hood 302, and the other end of the exhaust duct 302 is a high-temperature flue gas discharge port 304.

[0081] The low-speed air flow 6 is introduced into the blower static pressure box 201 from the low-speed air inlet 205, and the low-speed air flow 6 is converted into a static-pressure low-speed air flow 5 under the treatment of the blower static pressure box 201, and the static-pressure low-speed air flow 5 flows out from the static-pressure low-speed air supply port 206 through the low-speed air supply duct 204.

[0082] The gas to be treated 7 is introduced into the high-speed pulsed air flow pipe 202 from the gas to be treated inlet 207. When the gas to be treated 7 passes through the pneumatic pulse generator 203, it is converted into a high-speed pulsed air flow 4 under the treatment of the pneumatic pulse generator 203, and the high-speed pulsed air flow 4 flows out from the high-speed pulsed air supply port 208.

[0083] Under the push of the static-pressure low-speed air flow 5 and the high-speed pulsed air flow 4, the high-temperature flue gas 8 generated from the high-temperature flue gas generation port 102 will flow into the exhaust hood 301 from the high-temperature flue gas suction port 303, pass through the exhaust duct 302 and finally flow out from the high-temperature flue gas discharge port 304.

[0084] In this embodiment, the high-temperature flue gas discharge port 304 is used to connect one end of a suction device, and the other end of the suction device is connected to a dust removal system, and the dust removal system is a conventional dust removal system known in the prior art.

[0085] As a specific solution of this embodiment, the distance L between the static-pressure low-speed air supply port 206 and the high-temperature flue gas suction port 303 is 2.87 m; the diameter D of the low-speed air supply duct 204 is 100 mm; the diameter d of the high-speed pulsed air flow pipe 202 is 15 mm. To prevent the static-pressure low-speed air flow 5 and the high-speed pulsed air flow 4 from blowing away the liquid level in the melting tank 1 and affecting the process and the control effect of pollutants, in this embodiment, the distance H between the bottom surface of the low-speed air supply duct 204 and the high-temperature flue gas generation port 102 is set to 0.4 mm.

[0086] As a specific solution of this embodiment, the distance L between the rectifying orifice plate 211 and the static pressure low-speed air supply outlet 206 1 is set to 200 mm, the opening ratio of the rectifying orifice plate 211 is set to 40%, and the opening diameter of the rectifying orifice plate 211 is set to 4 mm. Such a setting can effectively prevent the solution from adhering to the rectifying orifice plate 211 and causing blockage, thereby resulting in the failure of the rectifying orifice plate 211.

[0087] Effect verification:

[0088] In order to verify the control and capture effect of the melting bath with a composite pulse blow-suction ventilation system on pollutants given in Embodiment 3, a numerical simulation model was established according to the actual situation.

[0089] The boundary conditions set for the numerical simulation model are shown in Table 1:

[0090] Table 1 Simulation boundary conditions of three ventilation systems

[0091]

[0092]

[0093] The main set parameters of the numerical simulation model are as follows: The above three ventilation systems are all placed in a room with a size of 13 * 13 * 9 m (length * width * height). The size of the air supply outlet of the air supply device is set to 3.5 m * 0.1 m, the diameter of the melting bath is set to 3.5 m, the surface temperature of the bath is set to 773 K, and the rising speed of the high-temperature flue gas is set to 0.05 m / s. An exhaust device is arranged on the side of the melting bath, and the size of the high-temperature flue gas suction inlet of the exhaust device is set to 3.7 * 1.5 m.

[0094] The air flow between the blow-suction flow fields is basically a low-speed flow with a Mach number less than 0.3. And since the pollution source is a high-temperature heat source, the indoor air is an ideal incompressible fluid. In the simulation, the Realizable k-ε two-equation model is selected for simulation calculation. On the basis of the above assumptions, the control equations are determined as shown below:

[0095] The continuity equation is shown in Equation II:

[0096]

[0097] The momentum equation is shown in Equation III:

[0098]

[0099] The energy equation is shown in Equation IV:

[0100]

[0101] The concentration equation is as shown in Equation V:

[0102]

[0103] In the equation:

[0104] u is the air flow velocity;

[0105] k is the turbulent kinetic energy;

[0106] T is the indoor air temperature;

[0107] μ is the laminar dynamic viscosity coefficient;

[0108] μ t is the turbulent dynamic viscosity coefficient;

[0109] p is the air pressure;

[0110] ρ is the air density;

[0111] C p is the specific heat capacity at constant pressure of air;

[0112] q is the heat flux density;

[0113] β is the fluid volume expansion coefficient;

[0114] c is the pollutant concentration;

[0115] F c is the pollutant release rate;

[0116] C c is a constant;

[0117] Pr is the Prandtl number.

[0118] The above control equations are discretized using the finite volume method (FVM). The second-order upwind scheme is selected for the discretization format, and the SIMPLEC algorithm is used to solve the discretized equations. When the residual values of both the velocity term and the pressure term are less than 10 -3 , and at the same time the residual values of temperature and components are less than. The control equation set converges, and at this time, the control situation of the entire ventilation system on pollutants can be obtained.

[0119] The above numerical simulation tests compared the control effects of pollutants by a single-pulse ventilation system, a low-speed blow-suction ventilation system (i.e., the traditional blow-suction ventilation system) and the composite pulse blow-suction ventilation system of the present invention, as shown in Figures 7 and 8. It can be seen from Figure 8 that the composite pulse blow-suction ventilation system of the present invention has the best control effect on pollutants, followed by the low-speed blow-suction system, and the single-pulse system has the worst control effect on pollutants. This is because the single-pulse system and the low-speed blow-suction system have insufficient air supply momentum, resulting in a large amount of pollutants escaping. For the composite pulse blow-suction system involved in the present invention, due to the difference in velocity gradient and periodic fluctuation between the high-speed pulse flow and the surrounding low-speed stable air supply fluid, the high-speed pulse flow effectively induces the low-speed stable air supply airflow to flow along the direction of controlling pollutants, and the control effect of the pollutant capture efficiency is significantly improved. At the same time, since the outlet duct diameter and air volume of the high-speed pulse flow are small, the control effect of pollutants is improved under the condition of keeping the exhaust energy consumption unchanged, and the economy of the system is improved.

Claims

1. A smelting tank, comprising a smelting tank main body (101), and the open top end of the smelting tank main body (101) is a high-temperature flue gas generating port (102); It is characterized in that the smelting tank (1) is provided with a composite pulse blowing and suction ventilation system, and the composite pulse blowing and suction ventilation system includes a blowing device (2) and an exhaust device (3); a blowing device (2) is arranged above the upper side of the high-temperature flue gas generating port (102) in the horizontal direction, and an exhaust device (3) is arranged on the other side in the horizontal direction of the high-temperature flue gas generating port (102), and the exhaust device (3) is arranged on the top of the other side in the horizontal direction of the smelting tank main body (101); the blowing device (2) is used to send out a high-speed pulsed air flow (4) and a static pressure low-speed air flow (5), the speed of the high-speed pulsed air flow (4) is greater than the speed of the static pressure low-speed air flow (5), and the maximum speed difference between the high-speed pulsed air flow (4) and the static pressure low-speed air flow (5) is 5 m / s to 10 m / s; The velocity V of the high-speed pulsed air flow R As shown in Formula I: V R= The formula for I is 25 + 3sin(0.5πt); In Formula I: V R represents the velocity of the high-speed pulsed air flow; t represents the air supply time of the high-speed pulsed air flow; the blowing device (2) includes a blower static pressure box (201), the blower static pressure box (201) is connected to a blower, and a high-speed pulsed air flow pipe (202) is arranged inside the top of the blower static pressure box (201); the horizontal one end of the high-speed pulsed air flow pipe (202) extends out of the other side in the horizontal direction of the blower static pressure box (201), and a pneumatic pulse generator (203) is arranged on the high-speed pulsed air flow pipe (202) located outside the other side in the horizontal direction of the blower static pressure box (201); a low-speed air flow supply pipe (204) is arranged on the other side in the horizontal direction of the blower static pressure box (201), and the low-speed air flow supply pipe (204) is located above the upper side of the high-temperature flue gas generating port (102) in the horizontal direction; the horizontal other end of the high-speed pulsed air flow pipe (202) penetrates through the blower static pressure box (201) and the low-speed air flow supply pipe (204), the horizontal other end of the high-speed pulsed air flow pipe (202) is flush with the horizontal other end of the low-speed air flow supply pipe (204), and the high-speed pulsed air flow pipe (202) and the low-speed air flow supply pipe (204) are coaxially arranged; the exhaust device (3) includes an exhaust hood (301), one side in the horizontal direction of the exhaust hood (301) is arranged on the top of the other side in the horizontal direction of the smelting tank main body (101), and one side in the horizontal direction of the exhaust hood (301) is arranged opposite to the horizontal other end of the low-speed air flow supply pipe (204); the other end in the horizontal direction of the exhaust hood (301) is communicated with an exhaust pipe (302); a low-speed air flow inlet (205) is arranged at the bottom of the blower static pressure box (201), and the horizontal other end of the low-speed air flow supply pipe (204) is a static pressure low-speed air flow supply port (206); the horizontal one end of the high-speed pulsed air flow pipe (202) is a to-be-treated air flow inlet (207), and the horizontal other end of the high-speed pulsed air flow pipe (202) is a high-speed pulsed air flow supply port (208); One lateral end of the exhaust hood (301) is a high-temperature flue gas suction inlet (303). The high-temperature flue gas suction inlet (303) is located above the side of the high-temperature flue gas generation port (102). One end of the exhaust duct (302) is connected to the exhaust hood (302), and the other end of the exhaust duct (302) is a high-temperature flue gas discharge port (304). The low-speed air flow (6) is introduced into the blower static pressure box (201) from the low-speed air flow inlet (205). The low-speed air flow (6) is converted into a static pressure low-speed air flow (5) under the treatment of the blower static pressure box (201). The static pressure low-speed air flow (5) flows out from the static pressure low-speed air duct outlet (206) via the low-speed air flow supply duct (204). The air flow to be treated (7) is introduced into the high-speed pulse air duct (202) from the air flow to be treated inlet (207). When the air flow to be treated (7) passes through the pneumatic pulse generator (203), it is converted into a high-speed pulse air flow (4) under the treatment of the pneumatic pulse generator (203). The high-speed pulse air flow (4) flows out from the high-speed pulse air duct outlet (208). Under the push of the static pressure low-speed air flow (5) and the high-speed pulse air flow (4), the high-temperature flue gas (8) generated from the high-temperature flue gas generation port (102) will flow into the exhaust hood (301) from the high-temperature flue gas suction inlet (303), pass through the exhaust duct (302) and finally flow out from the high-temperature flue gas discharge port (304).

2. The smelting tank according to claim 1, characterized in that, the distance between the static pressure low-speed air duct outlet (206) and the high-temperature flue gas suction inlet (303) is L, and the diameter D of the low-speed air flow supply duct (204) is 0.03L to 0.05L; the diameter d of the high-speed pulse air duct (202) is 0.2D to 0.1D; the distance H between the bottom surface of the low-speed air flow supply duct (204) and the high-temperature flue gas generation port (102) is 2D to 4D.

3. The smelting tank according to claim 2, characterized in that, an upper rectifying orifice plate fixing slot (209) and a lower rectifying orifice plate fixing slot (210) are provided on the inner wall of the low-speed air flow supply duct (204), and the upper rectifying orifice plate fixing slot (209) and the lower rectifying orifice plate fixing slot (210) are arranged oppositely; a rectifying orifice plate (211) is arranged in the low-speed air flow supply duct (204). The rectifying orifice plate (211) is arranged vertically. The top and bottom of the rectifying orifice plate (211) are respectively clamped in the upper rectifying orifice plate fixing slot (209) and the lower rectifying orifice plate fixing slot (210). A high-speed pulse air duct through hole (212) is opened at the center of the rectifying orifice plate (211), and the lateral other end of the high-speed pulse air duct (202) is arranged in the high-speed pulse air duct through hole (212).

4. The smelting tank according to claim 3, characterized in that, The distance L between the described flow straightening orifice plate (211) and the low-velocity static pressure air supply opening (206) 1 is 2D to 4D; the opening ratio of the described flow straightening orifice plate (211) is 35% to 45%, and the opening diameter of the flow straightening orifice plate (211) is 0.02D to 0.05D.

5. The smelting tank according to claim 3, characterized in that, On the low-speed air delivery duct (204) at the top of the upper rectifying orifice plate fixing slot (209), there is a rectifying orifice plate replacement opening (213). The rectifying orifice plate replacement opening (213) is covered with a sealing cover plate (214), and a cover plate handle (215) is arranged on the top surface of the sealing cover plate (214).

6. The smelting tank according to claim 1, characterized in that the high-speed pulsed air duct (202) is fixedly arranged inside the top of the air blower static pressure box (201) through a pulsed wire clip (216).

7. The smelting tank according to claim 1, characterized in that a plurality of flow guiding grilles (305) are arranged inside one lateral side of the exhaust hood (301).

8. A composite pulsed blowing and suction ventilation system, characterized in that it includes a air supply device (2) and an exhaust device (3); the air supply device (2) includes an air blower static pressure box (201), the air blower static pressure box (201) is connected with an air blower, and a high-speed pulsed air duct (202) is arranged inside the top of the air blower static pressure box (201); one lateral end of the high-speed pulsed air duct (202) extends out of the other lateral side of the air blower static pressure box (201), and a pneumatic pulsed generator (203) is arranged on the high-speed pulsed air duct (202) located outside the other lateral side of the air blower static pressure box (201); a low-speed air delivery duct (204) is arranged on the other lateral side of the air blower static pressure box (201); the other lateral end of the high-speed pulsed air duct (202) penetrates through the air blower static pressure box (201) and the low-speed air delivery duct (204), the other lateral end of the high-speed pulsed air duct (202) is flush with the other lateral end of the low-speed air delivery duct (204), and the high-speed pulsed air duct (202) and the low-speed air delivery duct (204) are coaxially arranged; on the inner wall of the low-speed air delivery duct (204), there are an upper rectifying orifice plate fixing slot (209) and a lower rectifying orifice plate fixing slot (210), and the upper rectifying orifice plate fixing slot (209) and the lower rectifying orifice plate fixing slot (210) are arranged oppositely; a rectifying orifice plate (211) is arranged inside the low-speed air delivery duct (204), the rectifying orifice plate (211) is arranged vertically, the top and bottom of the rectifying orifice plate (211) are respectively clamped in the upper rectifying orifice plate fixing slot (209) and the lower rectifying orifice plate fixing slot (210); a high-speed pulsed air duct through hole (212) is arranged at the center of the rectifying orifice plate (211), and the other lateral end of the high-speed pulsed air duct (202) is arranged inside the high-speed pulsed air duct through hole (212); on the low-speed air delivery duct (204) at the top of the upper rectifying orifice plate fixing slot (209), there is a rectifying orifice plate replacement opening (213). The rectifying orifice plate replacement opening (213) is covered with a sealing cover plate (214), and a cover plate handle (215) is arranged on the top surface of the sealing cover plate (214); the high-speed pulsed air duct (202) is fixedly arranged inside the top of the air blower static pressure box (201) through a pulsed wire clip (216); The described exhaust device (3) includes an exhaust hood (301), and the lateral side of the exhaust hood (301) is disposed opposite to the lateral other end of the low-speed air flow supply duct (204); the lateral other end of the exhaust hood (301) is communicated with an exhaust duct (302). A plurality of flow guiding grilles (305) are arranged inside the lateral side of the exhaust hood (301).

9. An air supply device characterized in that it includes a blower static pressure box (201), the blower static pressure box (201) is connected to a blower, and a high-speed pulsed air flow pipe (202) is arranged inside the top of the blower static pressure box (201). The lateral one end of the high-speed pulsed air flow pipe (202) extends outside the lateral other side of the blower static pressure box (201), and a pneumatic pulsed generator (203) is arranged on the high-speed pulsed air flow pipe (202) located outside the lateral other side of the blower static pressure box (201); the lateral other side of the blower static pressure box (201) is provided with a low-speed air flow supply duct (204). The lateral other end of the high-speed pulsed air flow pipe (202) penetrates through the blower static pressure box (201) and the low-speed air flow supply duct (204), the lateral other end of the high-speed pulsed air flow pipe (202) is flush with the lateral other end of the low-speed air flow supply duct (204), and the high-speed pulsed air flow pipe (202) and the low-speed air flow supply duct (204) are coaxially arranged. Upper and lower rectifying orifice plate fixing chutes (209) and (210) are arranged on the inner wall of the low-speed air flow supply duct (204), and the upper and lower rectifying orifice plate fixing chutes (209) and (210) are arranged opposite to each other. A rectifying orifice plate (211) is arranged inside the low-speed air flow supply duct (204), the rectifying orifice plate (211) is arranged vertically, and the top and bottom of the rectifying orifice plate (211) are respectively clamped in the upper rectifying orifice plate fixing chute (209) and the lower rectifying orifice plate fixing chute (210); a high-speed pulsed air flow pipe through hole (212) is opened at the center of the rectifying orifice plate (211), and the lateral other end of the high-speed pulsed air flow pipe (202) is arranged inside the high-speed pulsed air flow pipe through hole (212). A rectifying orifice plate replacement opening (213) is opened on the low-speed air flow supply duct (204) at the top end of the upper rectifying orifice plate fixing chute (209), a sealing cover plate (214) covers the rectifying orifice plate replacement opening (213), and a cover plate handle (215) is arranged on the top surface of the sealing cover plate (214). The high-speed pulsed air flow pipe (202) is fixedly arranged inside the top of the blower static pressure box (201) through a pulsed wire clip (216).

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