Washing tower for lime kiln tail gas
By designing a scrubber for lime kiln exhaust gas, using an inclined bottom seal, anti-blocking tower tray and spraying and flushing device, the problem of nozzle blockage in lime kiln exhaust gas treatment is solved, and efficient cooling and dust removal effect is achieved.
Patent Information
- Application Number
- CN202422340076.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-25
AI Technical Summary
Existing lime kiln exhaust gas treatment equipment is prone to scale due to the reaction of lime dust and water, resulting in blockage of nozzles and affecting the cooling and dust removal effect.
A scrubber for lime kiln exhaust gas is designed, using a bottom seal tilt setting, anti-blocking tower tray, a blade-type mist defogger and a spray and flushing device to prevent clogging and optimize gas-liquid contact through the gas distributor and the scrubber inlet.
It realizes anti-blocking, efficient cooling and dust removal, avoids nozzle blockage, and ensures stable operation of the production system.
Smart Images
Figure CN223184334U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of lime kiln tail gas washing, in particular to a washing tower for lime kiln tail gas. Background Art
[0002] Lime kiln exhaust typically reaches temperatures of 100-200°C. Its primary components are CO₂ (approximately 30-40%), N₂ (nearly 70-60%), and small amounts of O₂, CO, and SO₂ (totaling approximately 1%). This exhaust also contains some water vapor (from the moisture in the coal and rock) and a certain amount of solid dust (up to 1-10 grams per cubic meter). The primary components of this dust are lime or limestone and pulverized coal. Approximately 80% of this dust is fallen dust larger than 10 microns, while approximately 20% is floating dust smaller than 10 microns. This can cause severe air pollution and requires cooling and dust removal.
[0003] Existing wet treatment methods are mainly based on spray washing, but since lime dust reacts with water to release a large amount of heat and produce calcium carbonate, it is easy to scale and clog the nozzle, resulting in poor spraying and insufficient cooling, thus affecting the entire production system. Summary of the Invention
[0004] In order to overcome the above-mentioned deficiencies of the existing equipment, the utility model provides a lime kiln tail gas washing tower, which has the characteristics of anti-clogging, high-efficiency cooling and dust removal.
[0005] The technical solution of the utility model is a washing tower for tail gas from a lime kiln, which is characterized in that a bottom head and a washing liquid outlet are arranged at the bottom of the tower body, a gas distributor, an anti-blocking tray, a washing liquid inlet, and a blade-type demister are arranged in the middle section of the tower body, and a tail gas outlet is arranged at the top of the tower; the bottom head is fixedly mounted on the bottom plate of the tower body and tilted 3° toward the bottom of the tower body, a washing liquid outlet is arranged at the lower end of the bottom head, which is conducive to the discharge of the washing liquid without leaving any residual liquid; the gas distributor is mounted on the middle and lower part of the tower body, with a side lower opening, and is fixedly supported at one end of the tower body; a washing liquid inlet is arranged above the anti-blocking tray, and a washing liquid inlet is arranged above the anti-blocking tray. An anti-scouring plate is provided at the inlet of the washing liquid entering the tower body to prevent the washing liquid from eroding the tower internals and causing damage; the vane-type demister is installed above the anti-blocking tower tray, with the upper part connected to the tower body through the upper sealing plate and the lower part connected to the tower body through the lower sealing plate; a spray flushing device is provided in front of the vane-type demister to prevent the vane-type demister from being blocked by dust; a downcomer is provided at the bottom of the vane-type demister to allow the droplets intercepted by the vane-type demister to flow into the anti-blocking tower tray; the downcomer is fixed to the tower body through the lower sealing plate, with the upper end connected to the bottom of the vane-type demister and the lower end opening to the top of the anti-blocking tower tray.
[0006] Furthermore, the anti-clogging tray adopts a vertical sieve plate or a float valve tray to facilitate full contact between the flushing liquid and the tail gas.
[0007] Furthermore, the spray angle of the nozzle of the spray washing device is 90 degrees, which sprays the washing liquid vertically onto the blade-type demister to increase the spray contact area.
[0008] Furthermore, the upper sealing plate and the lower sealing plate are arranged in an up-and-down staggered manner on both sides of the blade-type demister.
[0009] The utility model has the following beneficial effects
[0010] (1) The utility model is a lime kiln tail gas washing tower, the bottom head of the tower body is inclined 3 degrees toward the bottom of the tower body to facilitate the discharge of liquid. The inclination can be slightly adjusted according to the specific production site.
[0011] (2) The utility model is a lime kiln tail gas washing tower, which adopts an anti-blocking tower plate to avoid lime scaling and blockage, and facilitates the removal of reaction heat.
[0012] (3) The utility model is a washing tower for lime kiln tail gas, in which a spray flushing device is provided in front of the blade-type demister, thereby avoiding the entrainment of mist and foam caused by water washing spray and preventing the demister from being blocked by dust. The preferred spray flushing adopts a spray angle of 90°, and a downcomer is provided at the bottom, so that the droplets intercepted by the blade-type demister can flow easily onto the tower plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of a lime kiln tail gas scrubber.
[0014] The figures are marked as follows: 1—bottom head; 2—tower body; 3—gas distributor; 4—anti-blocking tower plate; 5—washing liquid inlet; 6—anti-impact plate; 7—spray flushing device; 8—vane demister; 9—upper sealing plate; 10—lower sealing plate; 11—downcomer; 12—exhaust gas outlet; 13—washing liquid outlet. DETAILED DESCRIPTION
[0015] like Figure 1 As shown, the utility model is a lime kiln tail gas washing tower, which is mainly composed of a bottom head 1, a tower body 2, a gas distributor 3, an anti-blocking tower plate 4, a washing liquid inlet 5, an anti-impact plate 6, a spray flushing device 7, a blade type demister 8, an upper sealing plate 9, a lower sealing plate 10, and a downcomer.
[0016] The bottom head 1 is fixedly mounted on the bottom plate of the tower body 2 and is tilted 3° toward the bottom of the tower body to facilitate the discharge of the washing liquid. The tilt can be slightly adjusted depending on the specific production site. A washing liquid outlet 13 is provided at the lower end of the bottom head 1 to facilitate the discharge of the washing liquid without leaving any residual liquid.
[0017] The gas distributor 3 is installed in the middle and lower part of the tower body 2, with an opening on the lower side, and is supported at one end of the tower body 2; the exhaust gas enters the interior of the tower body 2 evenly from the gas distributor 3, and then fully contacts with the washing liquid through the anti-blocking tower tray 4 to remove dust while taking away the heat generated by the reaction through the washing liquid.
[0018] Preferably, the anti-clogging tray 4 adopts an anti-clogging vertical sieve plate or a float valve tray, which facilitates full contact between the flushing liquid and the tail gas to achieve the purpose of washing and purification.
[0019] A washing liquid inlet 5 is provided above the anti-blocking tower tray 4, and an anti-collision plate 6 is provided at the place where the washing liquid inlet 5 enters the tower body to prevent the washing liquid from eroding the tower internals and causing damage; the washing liquid flows into the anti-blocking tower tray 4 evenly from top to bottom through the washing liquid inlet 5, and comes into contact with the exhaust gas entering from the gas distributor 3; the exhaust gas purified by the anti-blocking tower tray 4 then enters the blade-type demister 8 to remove water vapor and fine dust entrained in the exhaust gas.
[0020] Preferably, the blade-type demister 8 is installed above the anti-blocking tray 4 , with the upper portion connected to the tower body 2 via an upper sealing plate 9 , and the lower portion connected to the tower body 2 via a lower sealing plate 10 .
[0021] Furthermore, a spray flushing device 7 is provided in front of the blade-type demister 8 to prevent the blade-type demister 8 from being blocked by dust.
[0022] The preferred spraying angle of the nozzle of the spray washing device is 90 degrees, which sprays the washing liquid vertically onto the blade-type demister 8 to increase the spray contact area.
[0023] Furthermore, a downcomer 11 is provided at the bottom of the vane-type demister 8 , so that the liquid droplets intercepted by the vane-type demister 8 flow onto the anti-blocking tray 4 .
[0024] Preferably, the downcomer 11 is fixed to the tower body through the lower sealing plate 10, the upper end is connected to the bottom of the blade-type demister 8, and the lower end opens to the top of the anti-blocking tray 4 and the distance is not too long.
[0025] The tail gas purified by the blade-type demister 8 is discharged through the tail gas outlet 12 .
Claims
1. A lime kiln tail gas scrubber, characterized in that A bottom head (1) and a washing liquid outlet (13) are provided at the bottom of the tower body, a gas distributor (3), an anti-blocking tray (4), a washing liquid inlet (5), and a blade-type demister (8) are provided in the middle section of the tower body, and an exhaust gas outlet (12) is provided at the top of the tower body; the bottom head (1) is fixedly mounted on the bottom plate of the tower body (2) and is inclined 3° toward the bottom of the tower body, and a washing liquid outlet (13) is provided at the lower end of the bottom head (1); the gas distributor (3) is mounted at the middle and lower part of the tower body (2), has a side lower opening, and is fixedly supported at one end of the tower body (2); a washing liquid inlet (5) is provided above the anti-blocking tray (4), and the washing liquid inlet (5) enters An anti-collision plate (6) is provided at the entrance to the tower body; a vane-type demister (8) is installed above the anti-blocking tower tray (4), the upper part of which is connected to the tower body (2) through an upper sealing plate (9), and the lower part of which is connected to the tower body (2) through a lower sealing plate (10); a spraying and flushing device (7) is provided in front of the vane-type demister (8); a downcomer (11) is provided at the bottom of the vane-type demister (8) so that the liquid droplets intercepted by the vane-type demister (8) flow into the anti-blocking tower tray (4); the downcomer (11) is fixed to the tower body through the lower sealing plate (10), the upper end of which is connected to the bottom of the vane-type demister (8), and the lower end of which opens to the top of the anti-blocking tower tray (4).
2. The lime kiln tail gas scrubber according to claim 1, wherein: The anti-blocking tray (4) adopts a vertical sieve plate or a float valve tray to facilitate full contact between the flushing liquid and the tail gas.
3. The lime kiln tail gas scrubber according to claim 1, wherein: The spraying angle of the nozzle of the spray washing device (7) is 90 degrees, and the washing liquid is sprayed vertically onto the blade type mist eliminator (8), thereby increasing the spray contact area.
4. The lime kiln tail gas scrubber according to claim 1, wherein: The upper sealing plate (9) and the lower sealing plate (10) are arranged in an upper and lower staggered manner on both sides of the blade-type demister (8).