Slurry concentration control device for swirler of grate rotary kiln oxidized pellet flue gas desulfurization system

Abstract

The utility model belongs to the technical field of grate rotary kilns, and relates to a swirler slurry concentration control device for an oxidized pellet flue gas desulfurization system of a grate rotary kiln. The upper part of the swirler (1) is communicated with a first opening of the three-way opening (2), a second opening of the three-way opening (2) is communicated with the accident slurry tank (3), a third opening of the three-way opening (2) is communicated with the absorption tower (4), the accident slurry tank (3) is communicated with the upper part of an inner cavity of the swirler (1), the absorption tower (4) is communicated with the upper part of the inner cavity of the swirler (1), and the concentration sensor (5) is arranged at the bottom of the inner cavity of the swirler (1). The swirler slurry concentration control device of the grate rotary kiln oxidized pellet flue gas desulfurization system is simple in structure, on the premise that overflow water is not discharged, the overflow water of the swirler is treated, the phenomenon that CaSO3 is enriched in slurry is reduced, the condition of the slurry in an absorption tower is kept within a controllable range, and the service life of the swirler is prolonged. And the SO2 emission concentration continuously meets the environmental protection requirement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chain and grate machine rotary kiln technical field, more specifically, relate to a kind of chain and grate machine rotary kiln oxidized pellet flue gas desulfurization system hydrocyclone slurry concentration control device. BACKGROUND

[0002] Current oxidized pellet production generally adopts chain and grate machine-rotary kiln-ring cooler process. Pellet flue gas needs to remove SO2 to meet environmental protection requirements. Pellet flue gas limestone-gypsum desulfurization method is a wet desulfurization process, and the main body of the system is an absorption tower. In the absorption tower, CaCO3 solution is used to absorb SO2 in the flue gas, and is replaced into CaSO3 solution and CO2, so as to reduce SO2 in the flue gas. After replacement, air is blown in to oxidize CaSO3 into CaSO4·2H2O, and CaSO4·2H2O solution is transported from the absorption tower to the hydrocyclone for separation. After separation, the lower underflow slurry is dewatered to obtain finished gypsum; the upper overflow water is generally returned to the absorption tower; if there is a large-scale centralized wastewater treatment system, it can also be directly discharged as wastewater to the wastewater treatment system. When the oxidation of CaSO3 in the absorption tower is insufficient, the solid content of the solution discharged from the absorption tower to the hydrocyclone is low, and the overflow water of the hydrocyclone contains a large amount of CaSO3. If it is returned to the absorption tower, it is easy to cause the CaSO3 in the slurry to be enriched, the absorption efficiency of the slurry to decrease, the SO2 emission concentration to be substandard, and the lower underflow slurry to be difficult to dewater; if it is discharged as wastewater, it will also greatly increase the treatment cost of the wastewater system. 2+ Gradually enriching, causing the "poisoning" phenomenon of slurry absorption efficiency, SO2 emission concentration not meeting standards, lower underflow slurry dewatering difficulty; if discharged as wastewater, it will also greatly increase the treatment cost of the wastewater system. The conditions of insufficient oxidation of CaSO3 in the absorption tower are more, including too high SO2 concentration of flue gas, higher SO2 emission concentration outlet requirement (lower outlet), insufficient air supply of oxidation air blower, pipe blockage in the absorption tower, and uneven slurry. CaSO3 and CaSO4·2H2O coexist in the absorption tower during normal production, so if the overflow water cannot be discharged as wastewater, CaSO3 in the slurry will always be enriched, until the desulfurization rate decreases and the SO2 emission concentration outlet is high.

[0003] The prior art has a technology with the title of "flue gas desulfurization system and flue gas desulfurization method", publication (announcement) number "CN102489143A", which relates to a flue gas desulfurization system and a flue gas desulfurization method. The system comprises a desulfurization absorption tower connected with a limestone slurry feeding pipe, a flue gas pipeline, a bag-type dust collector, two-stage mist eliminators, a blower, a slurry pump I, a hydrocyclone connected with the slurry pump I, characterized in that the hydrocyclone is further connected with a slurry pump II and a filter, the slurry pump II is further connected with a dewatering screen, and the dewatering screen is further connected with the filter and a gypsum storage respectively. The flue gas desulfurization method is that flue gas is dissolved in limestone slurry, oxidized and crystallized into gypsum slurry, concentrated by the hydrocyclone, and the underflow of the hydrocyclone is pumped into the dewatering screen by the slurry pump II for dewatering, and the overflow of the hydrocyclone is fed into the filter for filtration. The present application effectively solves the problem of difficult dewatering of gypsum by adding the filter and the dewatering screen behind the hydrocyclone of the flue gas desulfurization system and using the dewatering screen for dewatering, and the product gypsum has high added value.

[0004] However, the technology does not relate to the technical problems and technical solutions of the present application. Practical new type content

[0005] The technical problem solved by the present application is to provide a chain grate rotary kiln oxidized pellet flue gas desulfurization system cyclone slurry concentration control device with simple structure, which can treat the overflow water of the cyclone under the premise that the overflow water is not discharged, reduce the enrichment of CaSO3 in the slurry, keep the slurry condition in the absorption tower within a controllable range, and continuously meet the environmental protection requirements of SO2 emission concentration.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0007] The present application is a chain grate rotary kiln oxidized pellet flue gas desulfurization system cyclone slurry concentration control device, the first port of the three-way port at the upper part of the cyclone, the second port of the three-way port connected with the emergency slurry tank, the third port of the three-way port connected with the absorption tower, the emergency slurry tank connected with the upper part of the inner cavity of the cyclone, the absorption tower connected with the upper part of the inner cavity of the cyclone, and the concentration sensor arranged at the bottom of the inner cavity of the cyclone.

[0008] The second valve is arranged between the second port of the three-way port and the emergency slurry tank, and the third valve is arranged between the third port of the three-way port and the absorption tower.

[0009] The second port of the three-way port is connected with the emergency slurry tank through the second pipeline.

[0010] The third port of the three-way port is connected with the absorption tower through the third pipeline.

[0011] The accident slurry tank is communicated with the upper position of the inner cavity of the cyclone through a first pipeline, and the absorption tower 4 is communicated with the upper position of the inner cavity of the cyclone through a fourth pipeline.

[0012] The overflow port is arranged at the upper portion of the cyclone, and the overflow port is communicated with the first port of the three-way port.

[0013] The concentration sensor is connected with a control component, and the control component is connected with the second valve and the third valve.

[0014] The feeding port is arranged at the upper position of the side of the cyclone, and the feeding port is provided with a first branch pipe and a second branch pipe; the first branch pipe is communicated with the first pipeline, and the second branch pipe is communicated with the fourth pipeline.

[0015] The cyclone is a conical body structure with a diameter of the upper portion being larger than that of the lower portion.

[0016] The technical scheme of the utility model, working principle and beneficial effect are as follows:

[0017] The cyclone slurry concentration control device of the chain grate machine rotary kiln oxidized pellet flue gas desulfurization system increases a three-way port at the overflow port position of the upper portion of the cyclone, and the three-way port is simultaneously communicated with the absorption tower and the accident slurry tank, so that the overflow water in the cyclone can flow back to the absorption tower and the accident slurry tank in the backflow direction, and valves are respectively arranged on the pipelines of the absorption tower and the accident slurry tank; the concentration sensor detects the solid content of the underflow slurry of the cyclone; if the solid content of the underflow slurry is less than 35%, it is evaluated that the CaSO3 oxidation is insufficient; if the evaluation is that the CaSO3 oxidation is insufficient, the corresponding valve is opened to guide the overflow water to the accident slurry tank (the solid content is 30-35%, 50% is guided to the accident slurry tank; the solid content is less than 30%, and all the overflow water is guided to the accident slurry tank), and the valve connected with the absorption tower is closed; after the solid content of the underflow slurry detected by the concentration sensor returns to normal, the valve connected with the accident slurry tank is closed, and the valve connected with the absorption tower is opened, so that the overflow water is normally guided to the absorption tower. The device can reliably monitor the concentration of the solid content of the underflow slurry, take corresponding measures when the concentration is qualified and unqualified, conveniently and reliably control the concentration of the solid content of the underflow slurry, and meet the equipment operation requirements. The principle of the device is as follows: 1) the accident slurry tank is used for guiding, the CaSO3 in the absorption tower is relieved, and the quality of the slurry in the absorption tower is ensured; 2) the accident slurry tank is used for slowly oxidizing the CaSO3 in the overflow liquid, and the overflow liquid is normally guided to the cyclone for treatment after oxidation. BRIEF DESCRIPTION OF DRAWINGS

[0018] The content expressed by each drawing of the specification and the marks in the drawings are briefly described as follows:

[0019] Figure 1The structure schematic view of the cyclone slurry concentration control device of the chain and grate machine rotary kiln oxidation pellet flue gas desulfurization system is shown in the utility model.

[0020] The figure marks are: 1, cyclone; 2, three-way port; 3, accident slurry tank; 4, absorption tower; 5, concentration sensor; 6, second valve; 7, third valve; 8, second pipeline; 9, third pipeline; 10, first pipeline; 11, fourth pipeline; 12, overflow port; 13, outer cyclone; 14, inner cyclone; 15, feed inlet; 16, underflow port; 17, cover underflow; 18, underflow. DETAILED DESCRIPTION

[0021] The shape, structure, mutual position and connecting relationship between parts, the action and working principle of each component involved in the specific embodiment of the utility model are further explained in detail by the description of the embodiment with reference to the drawings:

[0022] As shown in the accompanying Figure 1The utility model discloses a kind of chain grate rotary kiln oxidized pellet flue gas desulfurization system cyclone slurry concentration control devices, the first port of cyclone 1 upper portion intercommunication three-way port 2, the second port of three-way port 2 intercommunication accident slurry tank 3, the third port of three-way port 2 intercommunication absorption tower 4, accident slurry tank 3 intercommunication cyclone 1 inner chamber upper portion position, absorption tower 4 intercommunication cyclone 1 inner chamber upper portion position, concentration sensor 5 is arranged in the bottom of cyclone 1 inner chamber.The above structure, for the deficiency in the prior art, improved technical solution is proposed.Structure is set, three-way port 2 is added in the overflow port 12 position of cyclone 1 upper portion, three-way port 2 is simultaneously interconnected absorption tower 4 and accident slurry tank 3, so that overflow water in the inside of cyclone 1 can be according to time sequence needs along reflux direction to absorption tower 4 and accident slurry tank 3 two directions reflux, respectively increase valve on the pipeline of absorption tower and accident slurry tank;The solid content of underflow slurry in cyclone 1 is detected by concentration sensor 5: if the detected underflow slurry solid content is less than 35%, it is evaluated as CaSO3 Oxidation is insufficient;If it is evaluated as CaSO3 Oxidation is insufficient, then open corresponding valve to drain overflow water to accident slurry tank 3 (solid content 30~35%, drain 50% to accident slurry tank 3;Solid content is less than 30%, all drain to accident slurry tank 3), the valve closed to absorption tower 4 at this time;After the solid content of underflow slurry detected by concentration sensor 5 returns to normal, the valve closed to accident slurry tank 3 is closed, the valve opened to absorption tower 5 at this time, overflow water is normally refluxed to absorption tower 4.The device of the utility model can reliably realize the concentration monitoring of the solid content of underflow slurry, take corresponding measures when the concentration is qualified and unqualified, conveniently and reliably control the concentration of the solid content of underflow slurry, meet equipment operation demand.The principle of the device of the utility model is: 1) use accident slurry tank to drain, relieve CaSO3 enrichment in absorption tower, ensure slurry quality in absorption tower;2) use accident slurry tank to slowly oxidize CaSO3 in overflow liquid, after oxidation, can normally drain back to cyclone for processing.The chain grate rotary kiln oxidized pellet flue gas desulfurization system cyclone slurry concentration control device, simple structure, under the premise that overflow water is not discharged, treats overflow water of cyclone, reduces CaSO3 enrichment phenomenon in slurry, so that slurry condition in absorption tower is kept within controllable range, SO2 emission concentration continuously meets environmental protection requirement.

[0023] Second valve 6 is arranged between the second port of three-way port 2 and accident slurry tank 3, and third valve 7 is arranged between the third port of three-way port 2 and absorption tower 4.The above structure, second valve and third valve are all electronic valves, can be opened and closed according to the detection result of concentration detector.

[0024] The second port of the three-way port 2 is communicated with the accident slurry tank 3 through the second pipeline 8. The third port of the three-way port 2 is communicated with the absorption tower 4 through the third pipeline 9. The accident slurry tank 3 is communicated with the upper position of the inner cavity of the cyclone 1 through the first pipeline 10, and the absorption tower 4 is communicated with the upper position of the inner cavity of the cyclone 1 through the fourth pipeline 11. The overflow water of the overflow port of the upper part of the cyclone can enter the accident slurry tank 3 or the absorption tower 4. The first pipeline 10 and the fourth pipeline 11 are respectively provided with valves, the valves on the first pipeline 10 and the fourth pipeline 11 are closed during overflow, and the corresponding valves on the first pipeline 10 or the fourth pipeline 11 are opened when the accident slurry tank 3 or the absorption tower 4 needs to be fed. In the structure of the utility model, the opening time of the fourth pipeline 11 is: when the slurry density of the absorption tower 4 is higher than 1.13 g / cm3, the fourth pipeline 11 is opened, and the slurry in the absorption tower 4 is sent into the cyclone. If the underflow slurry concentration detected by the underflow concentration sensor is higher than 35%, it is considered that the slurry is normal, and the cyclone is normally operated until the slurry density of the absorption tower 4 is lower than 1.10 g / cm3, and the fourth pipeline 11 is closed. If the detected underflow slurry solid content is lower than 35%, the fourth pipeline 11 is closed. The opening time of the first pipeline 10 is: when the slurry in the accident slurry tank 3 contains a large amount of CaSO3, the system is normally operated, the desulfurization efficiency meets the emission standard, and the first pipeline 10 is opened periodically, and a small amount of slurry in the accident slurry tank 3 is sent into the absorption tower 4 for digestion.

[0025] The overflow port 12 is arranged at the upper part of the cyclone 1 and communicated with the first port of the three-way port 2. The cyclone 1 comprises an outer cyclone 13 and an inner cyclone 14. The concentration sensor 5 is connected with a control component, and the control component is connected with the second valve 6 and the third valve 7. In the above structure, the control component (controller) is a microcontroller, and the model can be STM32H743VIT6. The microcontroller is a mature technology in the field of electronic technology, and the control component of the utility model is a direct application of the mature technology of the prior art, which is not an improvement.

[0026] The feed inlet 15 is arranged at the upper position of the side surface of the cyclone 1, the feed inlet is provided with a first branch pipe and a second branch pipe, the first branch pipe is communicated with the first pipeline 10, and the second branch pipe is communicated with the fourth pipeline 11. The cyclone 1 is a conical body structure with a diameter larger at the upper part than at the lower part.

[0027] The cyclone slurry concentration control device of the chain and grate machine rotary kiln oxidation pellet flue gas desulfurization system, when structure is set, three-way port 2 is added at the overflow port position of the upper portion of the cyclone, the three-way port 2 simultaneously communicates the absorption tower 4 and the accident slurry tank 3, so that the overflow water in the interior of the cyclone 1 can be refluxed along the reflux direction to the two directions of the absorption tower 4 and the accident slurry tank 3, valve doors are respectively added on the pipelines of the absorption tower and the accident slurry tank; the solid content of the underflow slurry of the cyclone 1 is detected by the concentration sensor 5; if the detected solid content of the underflow slurry is less than 35%, it is evaluated that CaSO3 oxidation is insufficient; if it is evaluated that CaSO3 oxidation is insufficient, the corresponding valve door is opened to guide the overflow water to the accident slurry tank 3 (the solid content is 30-35%, 50% is guided to the accident slurry tank 3; the solid content is below 30%, all is guided to the accident slurry tank 3), and the valve door connected with the absorption tower 4 is closed at this time; after the solid content of the underflow slurry detected by the concentration sensor 5 returns to normal, the valve door connected with the accident slurry tank 3 is closed, and the valve door connected with the absorption tower 5 is opened, at this time, the overflow water is normally refluxed to the absorption tower 4. The device can reliably realize the concentration monitoring of the solid content of the underflow slurry, corresponding measures are respectively taken when the concentration is qualified and unqualified, the concentration of the solid content of the underflow slurry is conveniently and reliably controlled, and the equipment operation requirement is met. The principle of the device is that: 1) the accident slurry tank is used for guiding, CaSO3 enrichment in the absorption tower is relieved, and the slurry quality in the absorption tower is ensured; 2) CaSO3 in the overflow liquid is slowly oxidized by the accident slurry tank, and after oxidation, the overflow liquid can be normally guided back to the cyclone for treatment.

[0028] The utility model has been described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited by the above mode, as long as various improvements are adopted by using the method concept and technical scheme of the utility model, or the concept and technical scheme of the utility model is directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. A device for controlling the slurry concentration of a hydrocyclone in a chain grate rotary kiln oxidizing pellet flue gas desulfurization system, characterized in that: The upper part of the hydrocyclone (1) is connected to the first port of the three-way port (2), the second port of the three-way port (2) is connected to the emergency slurry tank (3), the third port of the three-way port (2) is connected to the absorption tower (4), the emergency slurry tank (3) is connected to the upper part of the inner cavity of the hydrocyclone (1), the absorption tower (4) is connected to the upper part of the inner cavity of the hydrocyclone (1), and a concentration sensor (5) is installed at the bottom of the inner cavity of the hydrocyclone (1).

2. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidizing pellet flue gas as described in claim 1, characterized in that: A second valve (6) is provided between the second port of the three-way port (2) and the emergency slurry tank (3), and a third valve (7) is provided between the third port of the three-way port (2) and the absorption tower (4).

3. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 1 or 2, characterized in that: The second port of the three-way port (2) is connected to the emergency slurry tank (3) through the second pipe (8).

4. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 3, characterized in that: The third port of the three-way port (2) is connected to the absorption tower (4) through the third pipe (9).

5. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 1 or 2, characterized in that: The accident slurry tank (3) is connected to the upper part of the inner cavity of the hydrocyclone (1) through the first pipe (10), and the absorption tower (4) is connected to the upper part of the inner cavity of the hydrocyclone (1) through the fourth pipe (11).

6. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 1 or 2, characterized in that: The cyclone separator (1) is provided with an overflow port (12) at the top, and the overflow port (12) is connected to the first port of the three-way port (2).

7. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 2, characterized in that: The concentration sensor (5) is connected to the control component, which is connected to the second valve (6) and the third valve (7).

8. The hydrocyclone slurry concentration control device for the desulfurization system of the chain grate rotary kiln oxidation pellet flue gas as described in claim 5, characterized in that: The hydrocyclone (1) has a feed inlet (15) located on its side near the upper part. The feed inlet is provided with a first branch pipe and a second branch pipe. The first branch pipe is connected to the first pipe (10), and the second branch pipe is connected to the fourth pipe (11).

9. The hydrocyclone slurry concentration control device for the desulfurization system of a chain grate rotary kiln oxidizing pellet flue gas as described in claim 1 or 2, characterized in that: The cyclone separator (1) is a conical structure with an upper diameter larger than a lower diameter.

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