Gas uniform distribution device of lime kiln gas wet type electrostatic dust collector

Abstract

The invention discloses a gas uniform distribution device of a wet-type electrostatic dust collector for lime kiln gas, which comprises a barrel, a water tank, a gas inlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas inlet pipeline and a gas outlet pipeline, and is characterized in that the upper part of the barrel is a cylindrical barrel, and the lower part of the barrel is a cone; a drainage hole is formed in the bottom of the water tank; the funnel-shaped guide plates comprise the first funnel-shaped guide plate and the second funnel-shaped guide plate which are oppositely communicated, the first funnel-shaped guide plate is located in the water tank, the second funnel-shaped guide plate is located at the top of the water tank, the top of the second funnel-shaped guide plate is open, and the diameter of the top circle is smaller than that of the cylindrical barrel; and the sieve plate is fixedly mounted at the top position of the second funnel-shaped guide plate, so that the gas uniformly escapes. The problems that in the prior art, kiln gas distribution is not uniform, and the flow speed is reduced can be effectively solved.

Description

Technical Field

[0001] The invention relates to the field of wet electrostatic precipitators, and in particular to a gas uniform distribution device for a lime kiln gas wet electrostatic precipitator. Background Art

[0002] The kiln gas from the lime kiln must be recycled by the compressor. The compressor has strict requirements on the dust content of the kiln gas. The dust content of the kiln gas must be strictly controlled at 10mg / m 3 Otherwise, the dynamic balance of the compressor impeller will be destroyed, which will bring major hidden dangers and risks to the safe and stable operation of production. As an important dust removal equipment, the dust removal efficiency of wet electrostatic precipitator directly affects the production efficiency.

[0003] Dust removal efficiency is the most important indicator of wet electrostatic precipitator, and the distribution uniformity and speed of dust-containing gas in wet electrostatic precipitator largely affect the dust removal efficiency of wet electrostatic precipitator. Common lime kiln gas wet electrostatic precipitator generally processes 21000m3 of gas. 3 / h or less, their air inlet ducts often face downward after entering the bottom of the wet electrostatic precipitator. Although this avoids the risk of liquid reflux caused by the entry of spray water flowing down from the top of the wet electrostatic precipitator at regular intervals, it also causes problems such as uneven distribution of dust-laden gas after entering the dust collector and speed loss.

[0004] By simulating the gas velocity at the bottom of the cylinder of the wet electrostatic precipitator in the prior art through Fluent software, it can be seen that after the gas enters the cylinder laterally, the airflow distribution in the cylinder is obviously uneven, the airflow in the tower body is seriously skewed, the flow field is turbulent, etc., which makes it impossible for the spray water and the kiln gas to contact evenly, the local contact time is too short, and even a large amount of kiln gas directly escapes from the wall.

[0005] Therefore, it is necessary to improve the existing technology to solve the problems of uneven gas distribution and velocity loss. Summary of the invention

[0006] Technical problem to be solved: The present invention proposes a gas uniform distribution device for a lime kiln gas wet electrostatic precipitator, which is used to solve the problems existing in the background technology.

[0007] In order to solve the above technical problems, the following technical solutions are proposed:

[0008] A gas distribution device for a lime kiln gas wet electrostatic precipitator comprises a cylinder, wherein the upper part of the cylinder is a cylindrical cylinder, and the lower part is a cone, the top of the cylindrical cylinder is open, and an air inlet is opened on one side, and a drainage port is opened at the bottom of the cone, and further comprises:

[0009] A water tank is mounted inside the cylinder, one side of the water tank is connected to an air intake pipe, the air intake pipe is communicated with the air inlet, and a drainage hole is opened at the bottom of the water tank;

[0010] A funnel-shaped guide plate, comprising a first funnel-shaped guide plate and a second funnel-shaped guide plate which are oppositely connected and arranged, wherein the first funnel-shaped guide plate is located inside the water tank, and the second funnel-shaped guide plate is located at the top of the water tank, and the top of the second funnel-shaped guide plate is opened, and the diameter of the top circle is smaller than the diameter of the cylindrical barrel;

[0011] The sieve plate is fixedly installed at the top of the second funnel-shaped guide plate to ensure uniform gas overflow.

[0012] Furthermore, it also includes a liquid level measurement component, and the liquid level measurement component includes:

[0013] A sensing connecting rod is vertically arranged in the water tank, one end of which is fixed to the top wall of the water tank and the other end of which points to the drainage hole at the bottom of the water tank;

[0014] A float level gauge is slidably disposed on the sensing connecting rod and is used together with the sensing connecting rod to detect the water level in the water tank. The float level gauge is blocked at the position of the drain hole. When water accumulates in the water tank, the float level gauge rises with the water level and the drain hole opens.

[0015] A signal converter, arranged on the top of the water tank and connected to the signal of the float liquid level gauge, for converting the water level signal into an electrical signal;

[0016] The alarm device is installed on the outer wall of the cylinder and is connected with the signal converter line.

[0017] Furthermore, the funnel opening of the first funnel-shaped guide plate is arranged downward, and the funnel opening arranged downward is flush with the central horizontal line of the air intake duct.

[0018] Furthermore, an annular support frame is horizontally installed in the cylinder body, and a horizontal support platform is fixed in the annular support frame. The contour of the horizontal support platform is adapted to the bottom of the water tank and is used to support and place the water tank.

[0019] Furthermore, the maximum cross-sectional diameter of the float level gauge is greater than the diameter of the drain hole.

[0020] Furthermore, the volume of the water tank below the air intake pipe is at least 6 cubic meters.

[0021] Furthermore, the second funnel-shaped guide plate is located inside the cylinder.

[0022] Beneficial effects:

[0023] (1) The present invention proposes a gas distribution device for a lime kiln gas wet electrostatic precipitator, comprising a water tank and a first funnel-shaped guide plate and a second funnel-shaped guide plate arranged on the top of the water tank and connecting the inside and outside of the water tank. An air inlet pipe connected to the air inlet of the cylinder is arranged on one side of the water tank. After the kiln gas enters the water tank through the air inlet pipe, the water tank concentrates the kiln gas and uniformly contacts it with spray water, and then discharges it through the first funnel-shaped guide plate and the second funnel-shaped guide plate. Since the top of the water tank is open, the kiln gas can be directly discharged upward from the top of the water tank after entering the water tank, and the kiln gas loss rate is reduced compared with the prior art, wherein the diameter of the top circle of the second funnel-shaped guide plate is set to be smaller than the diameter of the cylindrical cylinder, thereby preventing a large amount of kiln gas from escaping along the wall. In addition, a sieve plate is arranged on the second funnel-shaped guide plate to ensure that the gas can be discharged upward evenly.

[0024] (2) In the present invention, a drainage hole is provided at the bottom of the water tank, and a sensing connecting rod is fixed on the top of the water tank opposite to the drainage hole. The sensing connecting rod is vertically fixed inside the water tank, and a float level gauge is slidably provided on the sensing connecting rod. In the initial state, the float level gauge blocks the drainage hole at the bottom of the water tank. When a certain amount of water is stored in the water tank, the float level gauge rises with the rise of the water level. In addition to detecting the water level in the water tank, the float level gauge also transmits the water level signal to the signal converter and the alarm. When the water level in the water tank is too high, the alarm sounds an alarm, and the staff can take corresponding measures according to the actual situation of the alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front cross-sectional view of the bottom device of the wet electrostatic precipitator of the present invention;

[0026] Figure 2 It is a three-dimensional cross-sectional view of the bottom device of the wet electrostatic precipitator of the present invention;

[0027] Figure 3 It is a front view of the overall device of the wet electrostatic precipitator of the present invention;

[0028] Figure 4 This is a structural diagram of the gas uniform distribution device of the present invention;

[0029] Figure 5 It is the structure diagram of the liquid level alarm in the gas distribution device;

[0030] Figure 6 It is a structural diagram of the support base in the gas uniform distribution device;

[0031] Figure 7 It is a front schematic diagram of the bottom device of a wet electrostatic precipitator in the prior art;

[0032] Figure 8 for Figure 7 Front view of the gas velocity distribution;

[0033] Fig. 9 for Figure 7 Top view of the air velocity distribution;

[0034] Fig.10 It is a front view of the gas velocity distribution at the bottom of the dust collector after the gas uniform distribution device is installed in the present invention;

[0035] Fig.11 This is a top view of the gas velocity distribution at the bottom of the dust collector after the gas uniform distribution device is installed in the present invention.

[0036] In the figure: 1, gas distribution device; 101, sieve plate; 102, second funnel-shaped guide plate; 103, signal converter; 104, first funnel-shaped guide plate; 105, sensing connecting rod; 106, float liquid level gauge; 107, air intake pipe; 108, water tank;

[0037] 2. Electric wire; 3. Liquid level alarm; 301. Numerical input interface; 302. Liquid level display interface; 303. Alarm;

[0038] 4. Drainage outlet; 5. Support base; 501. Horizontal support platform; 502. Ring support frame; 503. Bolt hole;

[0039] 6. Air inlet; 7. Cylinder; 8. Dust removal area; 9. Spray device; 10. Air outlet. DETAILED DESCRIPTION

[0040] The following examples will enable those skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0041] like Figure 1-2 As shown, for an air intake volume of 21000m 3 / h or less lime kiln gas wet electrostatic precipitator, the present invention proposes a gas intake volume of 21000m 3 The gas uniform distribution device of the wet electrostatic precipitator of lime kiln gas with a flow rate of less than / h mainly comprises a cylinder 7, a water tank 108, a funnel-shaped guide plate, and a sieve plate 101.

[0042] The upper part of the cylinder 7 is a cylindrical cylinder, and the lower part is a cone. The top of the cylindrical cylinder is open, and an air inlet 6 is opened on one side. The bottom of the cone is opened with a drain port 4;

[0043] A water tank 108 is installed inside the cylinder 7, one side of the water tank 108 is connected to an air intake pipe 107, the air intake pipe 107 is connected to the air inlet 6, and a drainage hole is opened at the bottom of the water tank 108;

[0044] A funnel-shaped guide plate is also provided in the cylinder 7 to connect the inside and outside of the water tank 108. The funnel-shaped guide plate includes a first funnel-shaped guide plate 104 and a second funnel-shaped guide plate 102 which are oppositely connected and arranged. The first funnel-shaped guide plate 104 is located inside the water tank 108, and the second funnel-shaped guide plate 102 is located at the top of the water tank 108. The top of the second funnel-shaped guide plate 102 is open, and the diameter of the top circle is smaller than the diameter of the cylindrical cylinder 7.

[0045] A sieve plate 101 is fixedly installed at the top of the second funnel-shaped guide plate 102 , and a number of through holes of the same size are evenly arranged on the sieve plate 101 to ensure uniform escape of gas.

[0046] The water tank 108 is provided for centrally placing the gas. A funnel-shaped guide plate and a second funnel-shaped guide plate 102 are provided on the water tank 108 to connect the inside and outside of the water tank 108, which can reduce the loss of kiln gas flow velocity and enable the water sprayed by the upper spray device 9 to fully contact the kiln gas. In addition, due to the setting of the sieve plate 101, it can be ensured that the gas can be discharged evenly.

[0047] like Figure 2 , 4 As shown, as a further improvement of this embodiment, a liquid level measurement component is also included, and the liquid level measurement component includes:

[0048] A sensing connecting rod 105 is vertically arranged in the water tank 108, one end of which is fixed to the top wall of the water tank 108, and the other end of which points to the drainage hole at the bottom of the water tank 108;

[0049] A float level gauge 106 is slidably disposed on the sensing link 105, and detects the water level in the water tank 108 together with the sensing link 105. The float level gauge 106 is blocked at the drainage hole at the bottom of the water tank 108. When water accumulates in the water tank 108, the float level gauge 106 rises with the water level, and the drainage hole opens;

[0050] The signal converter 103 is arranged on the top of the water tank 108 and is connected to the float level gauge 106 for converting the water level signal into an electrical signal;

[0051] The alarm device is installed on the outer wall of the cylinder 7 and is connected to the signal converter 103 by wire.

[0052] By setting up a liquid level measurement component, the water level in the water tank 108 can be monitored in real time.

[0053] like Figure 6As shown, as a further improvement of this embodiment, an annular support frame 502 is horizontally installed in the cylinder 7, and a horizontal support platform 501 is fixed in the annular support frame 502. The contour of the horizontal support platform 501 is adapted to the bottom of the water tank 108 and is used to support and place the water tank 108.

[0054] The kiln gas enters the cylinder 7 of the wet electrostatic precipitator from the side through the air inlet 6, and then enters the water tank 108. An air inlet pipe 107 is provided on one side of the water tank 108 near the top of the water tank 108, and the air inlet pipe 107 is connected to the air inlet 6 of the cylinder 7. The water tank 108 is placed on the support base 5, and the support base 5 includes an annular support frame 502 and a horizontal support platform 501. The support frame 502 is horizontally fixed on the side wall of the cylinder 7. The annular support frame 502 is connected to the side wall of the cylinder 7 by bolts, and the side wall of the cylinder 7 is connected. The horizontal support platform 501 is fixedly connected to the annular support frame 502. The bottom of the horizontal support platform 501 is square, which is adapted to the bottom of the water tank 108 and is used to support and place the water tank 108.

[0055] Air intake volume is 21000m 3 The flushing volume of a wet electrostatic precipitator with a flow rate of less than 1.2 km / h is generally less than 6 t. The volume of the water storage area of ​​the square water tank 108 (the volume of the water tank 108 below the air inlet pipe 107) should be designed to be slightly larger than the flushing volume of the dust collector each time. That is, the volume of the water tank 108 below the air inlet pipe 107 should not be less than 6 cubic meters. In this way, there will be ample time for maintenance in the event of a drainage failure.

[0056] The lid on the top of the water tank 108 can be opened to facilitate the installation or maintenance of other parts. Since the electrostatic precipitator is a large industrial equipment, it is not convenient to monitor the internal spraying and drainage in real time. Therefore, a standard float level gauge 106 with a large ball is installed in the water tank 108 to realize the automatic drainage function of the gas distribution device. The drainage aperture of the water tank 108 is slightly smaller than the maximum diameter of the float level gauge 106. The sensing connecting rod 105 is provided with a water level scale. The float level gauge 106 can read the water level scale in real time and transmit the water level scale signal to the signal converter 103. The signal converter 103 is used to convert the water level signal into an electrical signal and transmit the electrical signal to the alarm 303. The power supply is connected to the upper power box of the wet electrostatic precipitator. The alarm 303 sounds an alarm when the water level in the water tank 108 exceeds the preset maximum liquid level, effectively monitoring the water outlet and bottom drainage of the spray system in the precipitator, and providing an early warning for the occurrence of a fault.

[0057] A through hole of similar size to the air inlet 6 is provided at the top center of the water tank 108, and a second funnel-shaped guide plate 102 and a first funnel-shaped guide plate 104 are installed above and below the water tank 108, respectively. In order to facilitate sufficient water collection and relatively fixed gas diffusion size, the diameter of the funnel of the second funnel-shaped guide plate 102 is slightly smaller than the diameter of the cylinder 7. Figure 3 As shown, the distance between the upper port of the second funnel-shaped guide plate 102 and the upper anode dust removal area is within 100 mm, and a perforated sieve plate 101 is fixedly arranged on the port of the second funnel-shaped guide plate 102. The holes on the sieve plate 101 are evenly distributed according to the number and arrangement of anode tubes in the upper anode dust removal area. A first funnel-shaped guide plate 104 with a funnel opening facing downward is installed directly below the second funnel-shaped guide plate 102, and its bottom is parallel to the bottom of the water tank 108, and its height reaches the center horizontal line position of the air intake pipe 107.

[0058] like Figure 7-9 As shown, Figure 7 It is a cylinder 7 and internal structure diagram in the prior art. Figure 8 , Fig. 9 In order to use Fluent to simulate the gas flow rate and distribution effect diagram, it can be seen that in the prior art, after the kiln gas enters the cylinder 7 laterally, the airflow distribution in the cylinder 7 is obviously uneven, and the airflow in the tower body is seriously skewed and the flow field is turbulent, which makes it impossible for the spray water and the kiln gas to contact evenly, and the local contact time is too short or even a large amount of kiln gas directly escapes from the wall.

[0059] However, after improving the prior art, the present invention is simulated again using Fluent, and the effect diagram is as follows: Figure 10-11 As shown, after the kiln gas enters the gas distribution device, the gas velocity is evenly distributed, the gas velocity is concentrated in the central dust removal area 8, and the wall escape phenomenon is basically eliminated, thereby improving the dust removal efficiency of the dust-laden gas after entering the dust removal area.

[0060] During operation, kiln gas flows into the gas distribution device 1 from the air inlet 6, and the gas enters the water tank 108 from the air inlet pipe 107, and reaches the middle of the dust collector and the dust removal area through the lower funnel-shaped guide plate 104 and the upper funnel-shaped guide plate 102 and the sieve plate 101. The sieve plate 101 and the upper guide plate 102, and the upper and lower guide plates 104, 102 and the water tank 108 are connected by welding, and the sieve plate 101 is evenly drilled, deburred and leveled.

[0061] like Figure 3As shown, when the dust removal spray device 9 in the wet electrostatic precipitator sprays water downward from the top of the wet electrostatic precipitator at a fixed time, the second funnel-shaped guide plate 102 can collect water well into the water tank 108. The support base 5 is used to support the water tank. The support base 5 is composed of a horizontal support platform 501 and a ring support frame 502, which are connected to the external cylinder 7 through bolt holes 503. When water accumulates in the water tank 108, the float liquid level gauge 106 starts to work. The float liquid level gauge 106 will rise as the water level rises, thereby opening the water tank drain port 4 for drainage. The float liquid level gauge 106 and the signal converter 103 transmit the water level signal to the liquid level alarm 3 through the wire 2. The alarm 303 can set the maximum liquid level through the numerical input interface 301, and the liquid level display interface 302 displays the current liquid level value. Once the water level in the water tank 108 exceeds the maximum liquid level, the alarm 303 will sound an alarm.

[0062] After entering the water tank 108, the kiln gas passes through the first funnel-shaped guide plate 104 and the second funnel-shaped guide plate 102 and moves upward into the dust removal area 8. After dust removal in the dust removal area 8, the kiln gas continues to move upward and is finally discharged through the air outlet 10 of the wet electrostatic precipitator. The kiln gas is then collected.

[0063] The present invention can not only effectively improve the uniform distribution of kiln gas after the kiln gas enters the cylinder, but also ensure that the kiln gas is fully in contact with the spray water, reduce the dust content in the kiln gas, thereby ensuring the dust removal treatment of the kiln gas in the dust removal area, and further avoid the speed loss problem of the kiln gas after entering the cylinder, thereby improving the dust removal efficiency and avoiding the situation where a large amount of kiln gas directly escapes from the wall.

Claims

1. A gas distribution device for a lime kiln gas wet electrostatic precipitator, comprising a cylinder (7), the upper part of the cylinder (7) is a cylindrical cylinder, the lower part is a cone, the top of the cylindrical cylinder is open, and one side is provided with an air inlet (6), the bottom of the cone is provided with a drain outlet (4), characterized in that: Also includes: A water tank (108) is installed inside the cylinder (7), one side of the water tank (108) is connected to an air intake pipe (107), the air intake pipe (107) is in communication with the air intake port (6), and a drainage hole is provided at the bottom of the water tank (108); A funnel-shaped flow guide plate, comprising a first funnel-shaped flow guide plate (104) and a second funnel-shaped flow guide plate (102) which are arranged in opposite communication with each other, wherein the first funnel-shaped flow guide plate (104) is located inside a water tank (108), and the second funnel-shaped flow guide plate (102) is located at the top of the water tank (108); the top of the second funnel-shaped flow guide plate (102) is open, and the diameter of the top circle is smaller than the diameter of the cylindrical body; The sieve plate (101) is fixedly mounted at the top of the second funnel-shaped guide plate (102) to ensure uniform gas escape.

2. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 1, characterized in that: Also included is a liquid level measurement assembly, the liquid level measurement assembly comprising: A sensing connecting rod (105) is vertically arranged in the water tank (108), one end of which is fixed to the top wall of the water tank (108) and the other end of which points to the drainage hole at the bottom of the water tank (108); A float liquid level gauge (106) is slidably disposed on the sensing connecting rod (105) and is used together with the sensing connecting rod (105) to detect the water level in the water tank (108). The float liquid level gauge (106) is blocked at the position of the drainage hole. When water accumulates in the water tank (108), the float liquid level gauge (106) rises with the water level and the drainage hole opens. A signal converter (103) is arranged on the top of the water tank (108) and is connected to the signal of the float liquid level meter (106) to convert the water level signal into an electrical signal; The alarm device is installed on the outer wall of the cylinder (7) and is connected to the signal converter (103) by wire.

3. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 2, characterized in that: The maximum cross-sectional diameter of the float liquid level gauge (106) is greater than the diameter of the drainage hole at the bottom of the water tank (108).

4. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 1, characterized in that: The funnel opening of the first funnel-shaped guide plate (104) is arranged downwards, and the funnel opening arranged downwards is flush with the central horizontal line of the air intake duct (107).

5. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 1, characterized in that: An annular support frame (502) is horizontally installed in the cylinder (7), and a horizontal support platform (501) is fixed in the annular support frame (502). The contour of the horizontal support platform (501) is adapted to the bottom of the water tank (108) and is used to support and place the water tank (108).

6. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 1, characterized in that: The volume of the water tank (108) below the air intake pipe (107) is at least 6 cubic meters.

7. The gas distribution device of a lime kiln gas wet electrostatic precipitator according to claim 1, characterized in that: The second funnel-shaped guide plate (102) is located inside the cylinder (7).

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