Flue gas purification SDA semi-dry deacidification tower

Abstract

The invention provides a flue gas purification SDA semi-dry deacidification tower, comprising: a tower body and a flue gas distributor arranged on the top of the tower body, the flue gas distributor comprising: a flue gas distributor shell and a first rotating guide plate and a second rotating guide plate arranged in the flue gas distributor shell, the flue gas distributor shell comprising: an outer spiral shell, a top plate connected to the top of the outer spiral shell and extending inwardly, a bottom plate connected to the bottom of the outer spiral shell and extending inwardly and having an extension width smaller than the top plate, an annular partition plate connected to the inner edge of the bottom plate and extending upwardly to a certain distance from the top plate, a cylindrical body connected to the inner edge of the top plate and extending downwardly, and a conical cylindrical body connected to the lower part of the cylindrical body, an outer spiral smoke inlet duct is formed between the outer spiral shell and the annular partition plate, an inner annular smoke inlet duct is formed between the annular partition plate and the cylindrical body, the first rotating guide plate is installed on a side of the annular partition plate facing the outer spiral smoke inlet duct, and the second rotating guide plate is installed on a side of the cylindrical body facing the inner annular smoke inlet duct.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization and deacidification equipment, in particular to a flue gas purification SDA semi-dry deacidification tower. Background Art

[0002] With the continuous improvement of living standards and the promotion of garbage classification, the use of garbage incineration to generate electricity is not only conducive to garbage volume reduction, but also effective use of energy. How to effectively incinerate domestic waste to generate electricity and reduce pollutant emissions has become a new topic.

[0003] The semi-dry deacidification tower is one of the most important core equipment in the flue gas purification of garbage incineration. Its main function is to remove acidic gases such as SO2, HCL, HF, etc. from the flue gas. Ca(OH)2 slurry with a mass concentration of about 15% is usually used as an absorbent. The Ca(OH)2 slurry is sprayed into the deacidification tower through a rotary atomizer installed on the top of the deacidification tower. The speed of the rotary atomizer is controlled by a frequency converter and can be adjusted arbitrarily. The maximum speed can reach 16,000 rpm; the slurry atomization particle size is about 30 to 50um. The flue gas temperature from the waste heat boiler is 190 to 220°C, and the flue gas also enters from the upper part of the deacidification tower. In order to make the flue gas evenly distributed in the deacidification tower and fully contact with the droplets sprayed by the atomizer, the flue gas distributor on the top of the deacidification tower usually adopts a volute form, which can make the flue gas move downward in a spiral shape.

[0004] The degree of flue gas uniformity at the inlet of the deacidification tower determines the deacidification effect of the deacidification tower. The volute in the prior art adopts a form of gradually reducing the diameter to introduce the flue gas into the deacidification tower. For the flue gas purification of waste incineration, how to distribute the flue gas more effectively is an important direction of research on the deacidification tower. Summary of the invention

[0005] In order to solve the problems raised in the background technology, the present invention proposes a flue gas purification SDA semi-dry deacidification tower, which is used for desulfurization and deacidification of flue gas after waste incineration and for effective uniform distribution of flue gas.

[0006] The technical solution of the present invention is as follows:

[0007] A flue gas purification SDA semi-dry deacidification tower, comprising: a tower body and a flue gas distributor arranged on the top of the tower body, the flue gas distributor comprising: a flue gas distributor shell and a first rotating guide plate and a second rotating guide plate arranged in the flue gas distributor shell, the flue gas distributor shell comprising: an outer spiral shell, a top plate connected to the top of the outer spiral shell and extending inward, a bottom plate connected to the bottom of the outer spiral shell and extending inward and having an extension width smaller than the top plate, an annular partition plate connected to the inner edge of the bottom plate and extending upward to a certain distance from the top plate, and a ring-shaped partition plate connected to the top plate. A cylindrical body with a side edge and extending downward, a conical cylindrical body connected to the lower part of the cylindrical body, an outer spiral smoke inlet is formed between the outer spiral shell and the annular partition, an inner annular smoke inlet is formed between the annular partition and the cylindrical body, the first rotating guide vane is installed on the side of the annular partition facing the outer spiral smoke inlet, the second rotating guide vane is installed on the side of the cylindrical body facing the inner annular smoke inlet, the first rotating guide vane and the second rotating guide vane both rotate toward the inside of the smoke duct of the smoke distributor, and a rotary atomizer mounting hole is arranged at the bottom of the conical cylindrical body.

[0008] Further, the blades of the first rotating guide vane are inclined toward the inside of the outer spiral smoke inlet duct, and the inclination direction of the blades of the second rotating guide vane is opposite to the inclination direction of the blades of the first rotating guide vane.

[0009] Furthermore, the bottom of the second rotating guide vane extends to a position lower than the annular partition.

[0010] Furthermore, the cylindrical body and the second rotating guide vane are of equal height and aligned.

[0011] Furthermore, the outer spiral smoke inlet duct is wound around once, and its cross section gradually decreases while its height remains unchanged.

[0012] Furthermore, the tower body includes: a reaction tower body connected to the flue gas distributor, a conical tower section located below the reaction tower body, a flue gas side outlet arranged on the conical tower section, and a reaction ash outlet arranged at the bottom of the conical tower section.

[0013] Further, the reaction tower body is in the shape of a straight cylinder, and the conical tower section is in the shape of a cone. Further, the flue gas side outlet extends into the interior of the conical tower section, and the internal opening is inclined downward. Further, the top of the part where the flue gas side outlet extends into the interior of the conical tower section is set in a "︿" shape.

[0014] Furthermore, the conical tower section is provided with an electric heating device for heating and insulation when the system is cold started and the cone temperature is low.

[0015] The beneficial effect of the present invention is that it provides a technical solution for a spiral flue gas inlet that promotes a more uniform distribution of flue gas entering the deacidification tower, so that the flue gas and the atomized lime slurry sprayed out by the rotary atomizer are more fully mixed and reacted and absorbed, thereby achieving a good flue gas purification effect. Its working process is that the flue gas first enters the outer spiral flue gas inlet from the smoke inlet of the flue gas distributor, the first rotating guide vane on the inner side of the outer spiral flue gas inlet rotates inwards to drive the flue gas into the flue, the flue gas enters the inner annular flue gas inlet from the upper part of the annular partition, the second rotating guide vane in the inner annular flue gas inlet rotates inwards to drive the flue gas to rotate, and the flue gas accelerated by two rotations enters the tower body from the bottom of the inner annular flue gas inlet The rotary atomizer installed on the rotary atomizer mounting hole also injects the lime slurry sprayed by high-speed rotary atomization into the tower body. The slurry droplets form a downstream flow with the flue gas moving downward in a spiral shape, and are carried downward by the huge flue gas flow. In this process, the lime slurry reacts with the acidic gases HCl, HF, SO2, etc. in the flue gas, and the lime slurry and the flue gas are fully mixed and reacted. The acidic gas in the flue gas is absorbed by the lime slurry, thereby achieving the purpose of desulfurization and deacidification of the flue gas. The cooling process also causes condensation of dioxins and heavy metals. Since the flue gas rotates rapidly in a spiral shape, the lime slurry will not be sprayed onto the reactor wall, thereby keeping the wall dry and preventing scaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only partial embodiments of the present invention. Any improvements made within the scope of the concept of the present invention and that do not require creative labor can be used as other embodiments of the present invention.

[0017] Figure 1 A schematic diagram of the cross-sectional structure of a flue gas purification SDA semi-dry deacidification tower;

[0018] Figure 2 A schematic diagram of the three-dimensional structure of a flue gas purification SDA semi-dry deacidification tower;

[0019] Figure 3 A schematic diagram of the three-dimensional structure of the flue gas inlet of a flue gas purification SDA semi-dry deacidification tower;

[0020] Figure 4 A schematic diagram of the transverse cross-section structure of a flue gas purification SDA semi-dry deacidification tower flue gas inlet;

[0021] Figure 5 A schematic diagram of the longitudinal cross-section structure of the flue gas inlet duct of a flue gas purification SDA semi-dry deacidification tower.

[0022] Explanation of the reference numerals: tower body 1, reaction tower body 11, conical tower section 12, flue gas side outlet 13, reaction ash outlet 14, flue gas distributor 2, flue gas distributor shell 21, outer spiral shell 211, top plate 212, bottom plate 213, annular partition plate 214, cylinder 215, conical cylinder 216, outer spiral smoke inlet 217, inner annular smoke inlet 218, rotary atomizer mounting hole 219, first rotary guide vane 22, second rotary guide vane 23. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings, so that those skilled in the art can understand the present invention. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly; all technical features named by numbers such as "first", "second", or "No. 1" are only used for reference, without indicating the meaning of quantity or importance; all "connection" or similar words should be understood in a broad sense, for example, the connection can be a mechanical connection or an electrical connection, a direct connection or an indirect connection, a fixed connection or a detachable connection, etc., which is determined according to the actual intention of the technical solution: the technical features of multiple embodiments can be freely combined with each other without conflict, as long as they can constitute a technical solution to the corresponding technical problem.

[0024] As attached Figure 1-5As shown, a flue gas purification SDA semi-dry deacidification tower comprises: a tower body 1 and a flue gas distributor 2 arranged on the top of the tower body 1, the flue gas distributor 2 comprises: a flue gas distributor shell 21 and a first rotating guide plate 22 and a second rotating guide plate 23 arranged in the flue gas distributor shell 21, the flue gas distributor shell 21 comprises: an outer spiral shell 211, a top plate 212 connected to the top of the outer spiral shell 211 and extending inwardly, a bottom plate 213 connected to the bottom of the outer spiral shell 211 and extending inwardly and having an extension width smaller than the top plate 212, an annular partition plate 214 connected to the inner edge of the bottom plate 213 and extending upward to a certain distance from the top plate 212, and a ring-shaped partition plate 214 connected to the inner edge of the top plate 212. A cylindrical body 215 extending downward and a conical cylindrical body 216 connected to the lower part of the cylindrical body 215, an outer spiral smoke inlet 217 is formed between the outer spiral shell 211 and the annular partition 214, an inner annular smoke inlet 218 is formed between the annular partition 214 and the cylindrical body 215, the first rotating guide vane 22 is installed in a surrounding manner on the side of the annular partition 214 facing the outer spiral smoke inlet 217, the second rotating guide vane 23 is installed in a surrounding manner on the side of the cylindrical body 215 facing the inner annular smoke inlet 218, the first rotating guide vane 22 and the second rotating guide vane 23 both rotate toward the inside of the smoke duct of the smoke distributor 2, and a rotary atomizer mounting hole 219 is set at the bottom of the conical cylindrical body 216.

[0025] Specifically, this embodiment provides a technical solution for a spiral flue gas inlet that promotes a more uniform distribution of flue gas entering the deacidification tower, so that the flue gas and the atomized lime slurry sprayed out by the rotary atomizer are more fully mixed and reacted and absorbed, thereby achieving a good flue gas purification effect. Its working process is that the flue gas first enters the outer spiral flue gas inlet 217 from the smoke inlet of the flue gas distributor 2, and the first rotating guide vane 22 on the inner side of the outer spiral flue gas inlet 217 rotates inward to drive the flue gas into the flue, and the flue gas enters the inner annular flue gas inlet 218 from the upper part of the annular partition 214, and the second rotating guide vane 23 in the inner annular flue gas inlet 218 rotates inward to drive the flue gas to rotate. After two rotations and accelerations, the flue gas enters the tower body 1 from the bottom of the inner annular flue gas inlet 218, and the rotary atomizer installed on the rotary atomizer mounting hole 219 also sprays the lime slurry sprayed out by high-speed rotating atomization. After entering the tower body 1, the slurry droplets form a downstream flow with the flue gas moving downward in a spiral shape, and are carried downward by the huge flue gas flow. In this process, the lime slurry reacts with the acidic gases HCl, HF, SO2, etc. in the flue gas. In the first stage of the reaction process, the gas-liquid contact produces a neutralization reaction, the water in the lime slurry droplets is evaporated, and the flue gas is cooled at the same time; in the second stage, the gas-solid contact is further neutralized to obtain dry solid reactants CaCl2, CaF2, CaSO3 and CaSO4, etc. The lime slurry and the flue gas are fully mixed and reacted, and the acidic gases in the flue gas are absorbed by the lime slurry, thereby achieving the purpose of desulfurization and deacidification of the flue gas. The cooling process also causes condensation of dioxins and heavy metals. Since the flue gas rotates rapidly in a spiral shape, the lime slurry will not be sprayed onto the reactor wall, thereby keeping the reactor wall dry and preventing scaling.

[0026] Furthermore, the blades of the first rotating guide vane 22 are inclined toward the inside of the outer spiral smoke inlet 217, and the blade inclination direction of the second rotating guide vane 23 is opposite to the blade inclination direction of the first rotating guide vane 22. The first rotating guide vane 22 and the second rotating guide vane 23 rotate in the same direction and incline in opposite directions. The first rotating guide vane 22 is inclined inward, which is conducive to the smooth introduction of smoke into the inner annular smoke inlet 218 and entering the inner annular smoke inlet 218 from above, and the second rotating guide vane 23 is inclined in the opposite direction, which is conducive to the smoke entering the tower body 1 from below.

[0027] Furthermore, the bottom of the second rotating guide vane 23 extends to a position lower than the annular partition plate 214 .

[0028] Furthermore, the cylindrical body 215 and the second rotating guide vane 23 are of equal height and aligned.

[0029] Furthermore, the outer spiral smoke inlet duct 217 goes around a circle, and its cross section gradually decreases while its height remains unchanged.

[0030] Furthermore, the tower body 1 includes: a reaction tower body 11 connected to the flue gas distributor 2, a conical tower section 12 located below the reaction tower body 11, a flue gas side outlet 13 arranged on the conical tower section 12, and a reaction ash outlet arranged at the bottom of the conical tower section 12.

[0031] Furthermore, the reaction tower body 11 is in the shape of a straight cylinder, and the conical tower section 12 is in the shape of a cone.

[0032] Furthermore, the flue gas side outlet 13 extends into the interior of the conical tower section 12 , and the internal opening is inclined downward, so as to ensure that the flue gas comes out from the flue gas side outlet 13 and the particulate matter falls to the bottom without entering the flue gas side outlet 13 .

[0033] Furthermore, the top of the portion of the flue gas side outlet 13 extending into the interior of the conical tower section 12 is configured to be in a "︿" shape.

[0034] That is, a structure similar to a triangular roof to prevent dust from accumulating on the top.

[0035] Furthermore, the conical tower section 12 is provided with an electric heating device to heat and keep warm when the system is cold-started and the cone temperature is low. The reaction product falls into the reactor cone and is discharged from the bottom of the cone. The electric heating device prevents the reaction product from absorbing moisture and depositing. In addition, the cone part is equipped with a crusher, a pneumatic hammer vibration device and a double flap valve. The fly ash is discharged to the scraper conveyor of the fly ash conveying system through the crusher and the double flap valve.

[0036] The parts not described in detail in the present invention can be implemented by using existing technologies and do not constitute a limitation to the present invention.

[0037] The above embodiments are only used to illustrate the preferred implementation mode of the present invention, rather than to limit the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation mode and application scope, and the content of this specification should not be understood as limiting the present invention.

Claims

1. A flue gas purification SDA semi-dry deacidification tower, characterized in that: include: A tower body and a smoke distributor arranged on the top of the tower body, the smoke distributor comprising: a smoke distributor shell and a first rotating guide plate and a second rotating guide plate arranged in the smoke distributor shell, the smoke distributor shell comprising: an outer spiral shell, a top plate connected to the top of the outer spiral shell and extending inward, a bottom plate connected to the bottom of the outer spiral shell and extending inward and having an extension width smaller than the top plate, an annular partition plate connected to the inner edge of the bottom plate and extending upward to a certain distance from the top plate, a circular partition plate connected to the inner edge of the top plate and extending downward A cylinder body, a conical cylinder body connected to the lower part of the cylinder body, an outer spiral smoke inlet duct is formed between the outer spiral shell and the annular partition, an inner annular smoke inlet duct is formed between the annular partition and the cylinder body, the first rotating guide vane is installed around the side of the annular partition facing the outer spiral smoke inlet duct, the second rotating guide vane is installed around the side of the cylinder body facing the inner annular smoke inlet duct, the first rotating guide vane and the second rotating guide vane both rotate toward the inside of the smoke duct of the smoke distributor, and a rotary atomizer mounting hole is arranged at the bottom of the conical cylinder body.

2. The flue gas purification SDA semi-dry deacidification tower according to claim 1 is characterized in that: The blades of the first rotating guide vane are inclined toward the inside of the outer spiral smoke inlet duct, and the inclination direction of the blades of the second rotating guide vane is opposite to the inclination direction of the blades of the first rotating guide vane.

3. The flue gas purification SDA semi-dry deacidification tower according to claim 1 is characterized in that: The bottom of the second rotating guide vane extends to a position lower than the annular partition.

4. The flue gas purification SDA semi-dry deacidification tower according to claim 1 is characterized in that: The cylindrical body and the second rotating guide vane are of equal height and aligned.

5. The flue gas purification SDA semi-dry deacidification tower according to claim 1 is characterized in that: The outer spiral smoke inlet duct makes a circle, and its cross section gradually decreases while its height remains unchanged.

6. The flue gas purification SDA semi-dry deacidification tower according to any one of claims 1 to 5, characterized in that: The tower body comprises: a reaction tower body connected to the flue gas distributor, a conical tower section located below the reaction tower body, a flue gas side outlet arranged on the conical tower section, and a reaction ash outlet arranged at the bottom of the conical tower section.

7. The flue gas purification SDA semi-dry deacidification tower according to claim 6 is characterized in that: The reaction tower body is in the shape of a straight cylinder, and the conical tower section is in the shape of a cone.

8. The flue gas purification SDA semi-dry deacidification tower according to claim 7 is characterized in that: The flue gas side outlet extends into the interior of the conical tower section, and the internal opening is inclined downward.

9. The flue gas purification SDA semi-dry deacidification tower according to claim 8, characterized in that: The top of the portion of the flue gas side outlet extending into the interior of the conical tower section is configured in a "︿" shape.

10. The flue gas purification SDA semi-dry deacidification tower according to claim 6, characterized in that: The conical tower section is provided with an electric heating device to provide heating and insulation when the system is cold started and the cone temperature is low.

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