High-temperature dry desulfurization device

Abstract

The utility model relates to a high-temperature dry desulfurization device, which is sequentially provided with a feeding section, a return section and a desulfurization reaction section along the flue gas direction, the feeding section, the return section and the desulfurization reaction section are connected through one or more elbows, and one or more feeding nozzles are arranged on the pipe wall of the feeding section; the material returning section is provided with a material returning opening and a material returning and mixing device, and the material returning and mixing device is arranged on the upper portion of the interior of the material returning section and composed of multiple sections of spiral blades. The feeding nozzle is provided with the notch, and the spiral blade is arranged at the upper part in the material returning section, so that flue gas is dispersed for three times after entering, the mixing uniformity of a fresh desulfurizing agent and the flue gas is greatly enhanced, and the utilization rate of the desulfurizing agent is improved; desulfurized ash is sent back to a material returning section through a variable-frequency star-shaped ash discharging valve arranged at the lower end of the dust removal device by means of negative pressure of flue gas, ash leakage and ash blocking of a material circulating device are reduced, the mixing uniformity of circulating materials and flue gas is enhanced, the circulating utilization rate of a desulfurizing agent is increased, and the flue gas purification efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature flue gas desulfurization technical field, concretely is a kind of high-temperature dry desulfurization device. BACKGROUND

[0002] At present, the mainstream process of industrial kiln flue gas treatment such as glass kiln and sodium silicate kiln is to use high-temperature composite filter cartridge sulfur dust and nitrate integrated system, and the circulating fluidized bed high-temperature dry desulfurization process is usually used for desulfurization. This process is a kind of technology which uses the intense turbulence and high-efficiency heat and mass transfer in the fluidized bed to quickly remove SO2, SO3 and other pollutants from flue gas. The main reaction area in the circulating fluidized bed absorption tower is in the high-concentration area of material particles in the conical section, and the residence time of flue gas in this area is usually only 1-2 seconds. Therefore, in order to speed up the reaction of flue gas and desulfurizing agent and achieve high purification efficiency, it is necessary to strengthen the uniform mixing of fresh desulfurizing agent and flue gas, and to return the desulfurization ash to the tower through the material circulating device to increase the concentration of particles in the tower.

[0003] In the prior art, the method for strengthening the uniform mixing of fresh desulfurizing agent and flue gas usually uses compressed air and pipeline to transport fresh desulfurizing agent to the absorption tower. One method is to add the absorption tower in the conical section, which is just in the reaction area. However, due to the high concentration of the newly added material, it is difficult to diffuse quickly, and the mixing effect is not good. Another method is to add it in the Venturi front flue, which is carried into the absorption tower with flue gas. This process increases the mixing time of material particles and flue gas in the tower front flue, but due to the high flow rate of the flue, it cannot achieve good mixing.

[0004] There are two ways of material circulation in the prior art: one is to use dilute phase pneumatic conveying to directly send desulfurization ash to the absorption tower; the other is to use dilute phase or dense phase pneumatic conveying to send desulfurization ash to the transition bin, and then use the screw conveyor or air chute under the transition bin to send it to the absorption tower.

[0005] Both of the above methods have the disadvantage of poor uniform mixing of fresh desulfurizing agent and flue gas. In the two material circulation methods, due to the existence of positive pressure in the pipeline of dilute phase pneumatic conveying system, the rotary feeder in the conveying system is difficult to maintain sealing under high temperature conditions, and gas will leak out from the shaft seal of the rotary feeder, which has a poor environmental effect. In the second material circulation method, if dense phase pneumatic conveying is used, although the problem of dust leakage is avoided, neither the screw conveyor nor the air chute can ensure good mixing of desulfurization ash and flue gas, and the number of equipment, failure rate and cost are all increased. SUMMARY

[0006] The utility model provides a high -temperature dry method desulfurization device to solve the problem of uneven mixing of fresh desulfurizer and circulating material and flue gas, reduce material circulating device ash leakage, ash blockage, improve desulfurizer utilization, improve flue gas purification efficiency.

[0007] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a high -temperature dry method desulfurization device is equipped with feeding section, back material section and desulfurization reaction section along flue gas direction in proper order, and the feeding section, back material section and desulfurization reaction section are connected through single or multiple elbows, the feeding section is tubular, and single or multiple feeding nozzles are arranged on the pipe wall;The back material section is equipped with back material mouth and back material mixing device, the back material mouth is arranged on the top of the back material section outside, and the back material mixing device is arranged on the top of the back material section inside and is composed of multiple spiral blades.

[0008] Further, the desulfurization reaction section is equipped with flue gas outlet and desulfurization tower, the desulfurization tower is connected with the back material section through the elbow, the flue gas outlet is arranged on the side of the desulfurization tower, the upper end is connected with the upper part of the desulfurization tower, and the lower end is connected with the inlet of a dust removal device;The dust outlet of the lower end of the dust removal device is equipped with a variable frequency star-shaped dust discharging valve, and the variable frequency star-shaped dust discharging valve is connected with the back material mouth.

[0009] Further, the feeding nozzle is vertically installed on the feeding section, the internal part of the feeding nozzle extending into the feeding section is provided with a notch, and the notch of the feeding nozzle is opposite to the outlet direction of the elbow between the feeding section and the back material section.

[0010] Further, the diameter of the feeding nozzle is d, which is the same as the diameter of the external pneumatic conveying pipeline, the diameter of the feeding section is D1, the length of the notch is 0.5D1~0.75D1, and the width of the notch is 0.25d~0.75d;The distance between the installation position of the feeding nozzle and the center line of the feeding section is 0.125D1~0.25D1, and the distance between the feeding nozzle and the elbow is D1~5D1.

[0011] Further, the rotation angle of each spiral blade is 180°~270°, the diameter of the back material section is D2, the width of the spiral blade is 0.15D2~0.3D2, and the peak spacing of the spiral blade is 0.8~0.9 times the pitch of the spiral blade.

[0012] Compared with the prior art, the utility model provides a high -temperature dry method desulfurization device, has the following

[0013] Beneficial effects:

[0014] 1. The utility model discloses a spiral blade is set up in the inside upper portion of the material returning section, greatly strengthens the uniformity of fresh desulfurizer and flue gas mixing, promotes desulfurizer utilization rate, improves flue gas purification efficiency.

[0015] 2. The utility model discloses a notch is set up on the feeding nozzle, and the notch direction is contrary to the elbow outlet direction, makes the flue gas get twice dispersion after entering, after the third dispersion of spiral blade, the uniformity of fresh desulfurizer and flue gas mixing is greatly improved.

[0016] 3. The utility model discloses a flue gas outlet is set up in the desulfurization reaction section, is connected dust removal device, and is sent back to the material returning section by the frequency conversion star type dust discharging valve of dust removal device lower extreme and relies on flue gas negative pressure with desulfurized ash, reduces material circulating device ash leakage, ash plugging, strengthens circulating material and flue gas mixing uniformity, promotes desulfurizer recycling rate, improves flue gas purification efficiency, and simultaneously through the setting of dust removal device, can reduce the number of moving equipment, reduces system failure rate. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2 It is Figure 1 A-A direction section of the utility model is feeding nozzle schematic diagram;

[0019] Figure 3 It is Figure 1 B-B direction section of the utility model is spiral blade schematic diagram.

[0020] In the drawing: 1-feeding section, 2-material returning section, 3-desulfurization reaction section, 4-dust removal device, 5-elbow, 11-feeding nozzle, 111-notch, 21-material returning port, 22-material returning mixing device, 221-spiral blade, 31-flue gas outlet, 32-desulfurization tower, 41-frequency conversion star type dust discharging valve, 42-clean gas discharge pipe. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0022] Please refer to Figures 1-3In this embodiment: a high-temperature dry desulfurization device is provided with a feeding section 1, a return section 2 and a desulfurization reaction section 3 in sequence along the flue gas direction. The feeding section 1, the return section 2 and the desulfurization reaction section 3 are connected by one or more elbows 5, and the direction of the elbows 5 is set according to the needs of the process layout.

[0023] like Figure 1 , 2 As shown, the feeding section 1 is tubular, and one or more feeding nozzles 11 are provided on the tube wall. The feeding nozzles 11 are vertically installed on the feeding section 1, and the part extending into the inside of the feeding section 1 is provided with a notch 111. The notch 111 of the feeding nozzle 11 faces the opposite direction to the outlet direction of the bend 5 between the feeding section 1 and the return section 2.

[0024] The feeding nozzle 11 is connected to the outlet of the external pneumatic conveying system (not shown in the figure), and the diameter d of the feeding nozzle 11 is the same as the diameter of the external pneumatic conveying pipe. Figure 2 As shown, the length L of the notch 111 is 0.5D1 to 0.75D1 (the diameter of the feeding section 1 is D1), and the width W1 of the notch 111 is 0.25d to 0.75d; the distance S between the installation position of the feeding nozzle 11 and the center line of the feeding pipe 1 is 0.125D1 to 0.25D1, and the distance between the feeding nozzle 11 and the elbow 5 is D1 to 5D1.

[0025] like Figure 1 As shown, the return section 2 is equipped with a return port 21 and a return mixing device 22. The return port 21 is located on the upper outside of the return section 2, and the return mixing device 22 is located on the upper inside of the return section 2. It consists of multiple spiral blades 221, which can generate a spiral airflow in the return section 2. Under the agitation of the spiral airflow, the desulfurization ash and fresh desulfurizing agent are fully mixed with the flue gas. When the particulate matter in the flue gas moves forward in the return section 2, some particulate matter will inevitably be deposited. Since there are no blades below the return section 2, it will not affect the movement of particulate matter and cause particulate matter to accumulate and clump.

[0026] like Figure 3As shown, the rotation angle α of each helical blade 221 is 180° to 270°, the width W2 of the helical blade 221 is 0.15D2 to 0.3D2 (the diameter of the return section 2 is D2), and the spacing between the crests of the helical blade 221 is 0.8 to 0.9 times the pitch of the helical blade 221. These parameters are obtained through airflow simulation analysis to ensure that each helical blade 221 generates a sufficiently strong helical airflow. The helical airflow relies on inertial impaction to move the particles deposited at the bottom of the return section 2 forward with the flue gas. Furthermore, the outlet direction of the helical airflow generated by each helical blade 221 is consistent with the inlet direction of the next helical blade 221, resulting in a complete and strong helical airflow throughout the return section. Under the action of the return mixing device 22, the desulfurization ash and flue gas are fully mixed.

[0027] like Figure 1 As shown, the desulfurization reaction section 3 is equipped with a flue gas outlet 31 and a desulfurization tower 32. The desulfurization tower 32 is connected to the return material section 2 via an elbow 5. The flue gas outlet 31 is located on the side of the desulfurization tower 32, with its upper end connected to the upper part of the desulfurization tower 32 and its lower end connected to the inlet of the dust removal device 4. The upper part of the dust removal device 4 is connected to a clean gas discharge pipe 42, from which the clean flue gas after desulfurization is discharged. The lower ash outlet is equipped with a variable frequency rotary valve 41, which is connected to the return material inlet 2. The dust removal device 4 can collect the desulfurization ash discharged from the desulfurization reaction section 3. The variable frequency rotary valve 41 can set the discharge speed of the desulfurization ash flowing to the return material inlet 2 by changing the frequency. The dust removal device 4 returns the desulfurization ash to the return material section 2 at a set speed through the variable frequency rotary valve 41 and the return material inlet 21. Since the entire desulfurization ash circulation process is under negative pressure, the variable frequency star-shaped ash discharge valve 41 does not have the problem of dust leakage.

[0028] The working principle of this utility model is as follows: the desulfurizing agent is injected into the feeding section 1 through the feeding nozzle 11 connected to the pneumatic conveying pipeline. The desulfurizing agent, along with the flue gas, passes through the feeding section 1 and the first bend 5 and enters the return section 2. Under the agitation of the spiral airflow of the return mixing device 22, the desulfurization ash and fresh desulfurizing agent are fully mixed with the flue gas. The length and width of the notch 111, the distance between the feeding nozzle 11 and the center line of the feeding section 1, and the distance between the feeding nozzle 11 and the bend 5 are all obtained by airflow simulation analysis. Fresh desulfurizing agent enters the feeding section 2 through pneumatic conveying. Nozzle 11 first disperses the material at the notch 111 along the outlet direction of the feeding nozzle 11, then disperses it a second time at the bend 5 along the notch 111, and finally disperses it a third time along the spiral direction at the return mixing device 22 in the return section 2, so that the fresh desulfurizing agent and flue gas are fully mixed. The mixed flue gas enters the desulfurization reaction section 3 through the second bend 5, and after the desulfurization reaction, it enters the dust removal device 4 from the flue gas outlet 31. The dust removal device 4 returns the desulfurization ash to the return section 2, and the clean flue gas is discharged from the clean gas discharge pipe 42 of the dust removal device 4.

[0029] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or some of the technical features thereof can be replaced equivalently. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-temperature dry desulfurization device, characterized in that: A high-temperature dry desulfurization device comprises a feeding section, a return section, and a desulfurization reaction section arranged sequentially along the flue gas direction. The feeding section, return section, and desulfurization reaction section are connected by one or more elbows. The feeding section is tubular, with one or more feeding nozzles on the pipe wall. The return section is provided with a return port and a return mixing device. The return port is located above and outside the return section, and the return mixing device is located above and inside the return section, and is composed of multiple spiral blades.

2. The high-temperature dry desulfurization device according to claim 1, characterized in that: The desulfurization reaction section is equipped with a flue gas outlet and a desulfurization tower. The desulfurization tower is connected to the return material section via an elbow. The flue gas outlet is located on the side of the desulfurization tower, with its upper end connected to the upper part of the desulfurization tower and its lower end connected to the inlet of a dust removal device. The dust removal device has a variable frequency star-shaped ash discharge valve at its lower ash outlet, which is connected to the return material outlet.

3. The high-temperature dry desulfurization device according to claim 1, characterized in that: The feeding nozzle is vertically installed on the feeding section, and the portion extending into the interior of the feeding section has a notch. The notch of the feeding nozzle faces the opposite direction to the elbow outlet between the feeding section and the return section.

4. The high-temperature dry desulfurization device according to claim 3, characterized in that: The diameter of the feeding nozzle is d, which is the same as the diameter of the external pneumatic conveying pipe. The diameter of the feeding section is D1. The length of the notch is 0.5D1 to 0.75D1, and the width of the notch is 0.25d to 0.75d. The distance between the installation position of the feeding nozzle and the center line of the feeding section is 0.125D1 to 0.25D1, and the distance between the feeding nozzle and the elbow is D1 to 5D1.

5. A high-temperature dry desulfurization device according to claim 1, characterized in that: The rotation angle of each helical blade is 180° to 270°, the diameter of the return section is D2, the width of the helical blade is 0.15D2 to 0.3D2, and the crest spacing of the helical blade is 0.8 to 0.9 times the pitch of the helical blade.

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