Absorbent preparation device and flue gas desulfurization system

Abstract

An absorbent preparation device and a flue gas desulfurization system relate to the technical field of flue gas desulfurization equipment, and adopt the technical scheme that the absorbent preparation device comprises a slurry preparation tank, a chute connected with the slurry preparation tank, and a primary filter sieve arranged between the chute and the slurry preparation tank; a plurality of water conveying pipes are sequentially arranged at the bottom of the inclined groove from high to low, a plurality of water spraying nozzles are arranged on the sides, facing the primary filter sieve, of the water conveying pipes, and anti-blocking baffles are arranged above the water spraying nozzles and protrude out of the water spraying nozzles to extend towards one side of the primary filter sieve; and the slurry preparation tank is provided with a stirrer. According to the utility model, the chute is arranged in the slurry preparation tank, water and limestone raw materials are preliminarily mixed into fluid through the plurality of water spray nozzles, and then the fluid flows into the slurry preparation tank for stirring, so that the treatment capacity is large, meanwhile, a stirrer is prevented from being blocked, and the saving efficiency is improved; and the flue gas desulfurization system recycles liquid generated by dehydration, so that water resources are fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization equipment, in particular to an absorbent preparation device and a flue gas desulfurization system. Background Art

[0002] The flue gas from coal-fired boilers contains a large amount of sulfur dioxide, and direct emission will cause environmental pollution such as acid rain, so the flue gas needs to be desulfurized. The limestone-gypsum flue gas desulfurization system is one of the more common desulfurization methods. It is necessary to mix raw materials such as limestone powder with water to form a limestone slurry, which is used as an absorbent. At present, limestone slurry preparation equipment usually uses a mixing barrel. The feeder feeds the limestone powder into the mixing barrel, and then mixes it into a slurry after adding water in proportion. However, there is a problem of small processing capacity. When processing a large amount of limestone powder, the blades of the mixing barrel are easy to get stuck, and it needs to be processed in batches, and the production efficiency is low. Utility Model Content

[0003] Aiming at the problem of low production efficiency of preparing absorbent slurry in a stirring barrel in the prior art solution, the utility model provides an absorbent preparation device and a flue gas desulfurization system.

[0004] The utility model provides the following technical solutions: an absorbent preparation device, comprising a slurry preparation pool, an inclined slot connected to the slurry preparation pool, and a primary filter screen arranged between the inclined slot and the slurry preparation pool; a plurality of water pipes are arranged in sequence from high to low at the bottom of the inclined slot, a plurality of water nozzles are arranged on the water pipes toward one side of the primary filter screen, an anti-clogging baffle is arranged above the water nozzle, the anti-clogging baffle protrudes from the water nozzle and extends toward one side of the primary filter screen; the slurry preparation pool is provided with an agitator.

[0005] Preferably, it also includes a transfer tank and a storage tank arranged on one side of the slurry preparation tank, and the tops of the transfer tank and the storage tank are respectively provided with a secondary filter screen and a tertiary filter screen; the slurry preparation tank is provided with a first absorbent transfer pump, and the first absorbent transfer pump is connected to the secondary filter screen through a pipeline, and the transfer tank is provided with a second absorbent transfer pump, and the second absorbent transfer pump is connected to the tertiary filter screen through a pipeline.

[0006] Preferably, both the transfer tank and the storage tank are provided with agitators.

[0007] Preferably, the plurality of water pipes are arranged horizontally.

[0008] Preferably, the primary filter screen is an L-shaped grid.

[0009] A flue gas desulfurization system comprises an absorbent preparation device, an absorption tower and a gypsum dehydration device, wherein the absorbent preparation device is the aforementioned absorbent preparation device.

[0010] Preferably, the absorption tower includes a flue gas inlet and an absorption zone and an oxidation zone respectively arranged above and below the flue gas inlet; the absorption zone includes a plurality of spray devices, a demister arranged above the spray device and an exhaust port arranged above the demister; the oxidation zone is provided with an air inlet fan, a slurry discharge pump and a plurality of circulation pumps; one of the circulation pumps is connected to one of the spray devices through a pipeline; the storage tank of the absorbent preparation device is provided with an absorbent delivery pump, and the absorbent delivery pump is connected to the oxidation zone through a pipeline.

[0011] Preferably, the oxidation zone is further provided with a buffer pump, which is connected to a buffer tank via a pipeline, and the buffer tank is provided with a delivery pump, which is connected to the oxidation zone via a pipeline; the buffer tank is provided with an agitator.

[0012] Preferably, the absorption zone further comprises a foam catcher disposed below the spray device.

[0013] Preferably, the gypsum dehydration device includes a gypsum cyclone, the slurry discharge pump of the oxidation zone is connected to the gypsum cyclone through a pipeline, the slag discharge port of the gypsum cyclone is connected to a dehydrator, the liquid discharge port of the gypsum cyclone is connected to the oxidation zone through a pipeline, the liquid discharge port of the dehydrator is connected to a filtrate tank, the filtrate tank is provided with a filtrate pump, and the filtrate pump is respectively connected to a water pipe, an oxidation zone and a foam catcher through pipelines; the filtrate tank is provided with an agitator.

[0014] The beneficial effects of the utility model are as follows: by setting an inclined chute in the slurry preparation tank and using multiple water nozzles to preliminarily mix water and limestone raw materials into a fluid before flowing into the slurry preparation tank for stirring, the processing capacity is large, and at the same time, the agitator is prevented from getting stuck, thereby improving the saving efficiency; the flue gas desulfurization system reuses the liquid produced by dehydration, making full use of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram of one embodiment of an absorbent preparation device is shown in FIG.

[0016] Figure 2 A top view of an embodiment of an anti-clogging baffle.

[0017] Figure 3 A side view of an embodiment of an anti-clogging baffle.

[0018] Figure 4 This is an equipment connection diagram of an embodiment of a flue gas desulfurization system.

[0019] Figure numerals: 11, chute; 111, water pipe; 112, water nozzle; 113, anti-clogging baffle; 12, primary filter screen; 13, slurry preparation tank; 14, transfer tank; 141, secondary filter screen; 15, storage tank; 151, tertiary filter screen; 21, flue gas inlet; 22, absorption zone; 221, spray device; 222, demister; 223, foam collector; 23, oxidation zone; 231, air inlet fan; 232, slurry discharge pump; 233, circulation pump; 234, buffer pump; 24, buffer tank; 31, gypsum cyclone; 32, dehydrator; 33, filtrate tank. DETAILED DESCRIPTION

[0020] The following is a more detailed description of the implementation of the utility model in conjunction with the drawings and the figure marks, so that those skilled in the art can implement it after reading this specification. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model. Example

[0021] The utility model provides an absorbent preparation device, comprising a slurry preparation pool 13, an inclined slot 11 connected to the slurry preparation pool 13, and a primary filter screen 12 arranged between the inclined slot 11 and the slurry preparation pool 13. The bottom of the inclined slot 11 is sequentially provided with a plurality of horizontally arranged water pipes 111 from high to low, and the water pipe 111 is provided with a plurality of water nozzles 112 on one side facing the primary filter screen 12. Figure 1 , limestone raw materials such as limestone powder, limestone gypsum and limestone slurry are discharged into the chute 11, and are washed and mixed by water flow sprayed by multiple water nozzles 112, and then pass through the primary filter screen 12 to remove impurities with larger particle sizes, and then enter the slurry preparation tank 13. The agitator in the slurry preparation tank 13 mixes the limestone raw materials and water evenly to form absorbent slurry, with a large processing capacity. When entering the slurry preparation tank 13, the limestone raw materials and water have been preliminarily mixed into a fluid, which can effectively prevent the agitator blades from being stuck.

[0022] The chute 11 and the slurry preparation tank 13 can be made of concrete or steel. The primary filter screen 12 can be a grid screen, including a vertical part and a horizontal part connected in an L shape, the horizontal part abuts against the bottom of the chute 11, and is used to remove large-sized impurities such as stones and agglomerated limestone powder. Figure 2 , 3 In order to prevent the water nozzle 112 from being blocked during the unloading of limestone powder, an anti-blocking baffle 113 is provided above the water nozzle 112. Figure 2 , 3 The anti-clogging baffle 113 protrudes from the water nozzle 112 and extends toward one side of the primary filter screen 12, shielding the water nozzle 112 and a portion of the area in front of it to prevent limestone powder from accumulating at the outlet of the water nozzle.

[0023] Please refer to Figure 4 The absorbent preparation device also includes a transfer tank 14 and a storage tank 15 arranged on one side of the slurry preparation tank 13. The tops of the transfer tank 14 and the storage tank 15 are respectively provided with a secondary filter screen 141 and a tertiary filter screen 151. The slurry preparation tank 13 is provided with a first absorbent transfer pump, which is connected to the secondary filter screen 141 through a pipeline. The secondary filter screen 141 can use a vibrating screen to filter out some impurities from the absorbent slurry and then the filtrate enters the transfer tank 14. The transfer tank 14 is provided with a second absorbent transfer pump, which is connected to the tertiary filter screen 151 through a pipeline. The tertiary filter screen 151 can use a cylindrical screen to further filter out impurities from the absorbent slurry and then the filtrate enters the storage tank 15. The mesh apertures of the primary, secondary, and tertiary filter screens decrease in sequence. Both the transfer tank 14 and the storage tank 15 are provided with a stirrer to prevent the absorbent slurry from precipitating. Example

[0024] The utility model provides a flue gas desulfurization system, comprising an absorbent preparation device, an absorption tower and a gypsum dehydration device. The absorbent preparation device is the absorbent preparation device described in Example 1.

[0025] Please refer to Figure 4 The absorption tower includes a flue gas inlet 21 and an absorption zone 22 and an oxidation zone 23 respectively arranged above and below the flue gas inlet 21. The storage tank 15 of the absorbent preparation device is provided with an absorbent delivery pump, which is connected to the oxidation zone 23 through a pipeline to deliver the absorbent slurry to the oxidation zone 23.

[0026] Specifically, the absorption zone 22 includes a plurality of spray devices 221, a demister 222 disposed above the spray device 221, a frother 223 disposed at the bottom of the spray device 221, and an exhaust port disposed above the demister 222. The oxidation zone 23 is provided with a plurality of circulation pumps 233, one circulation pump 233 is connected to a spray device 221 through a pipeline, and the spray device 221 can refer to the relevant technology to spray the absorbent slurry in the absorption zone 22. The absorbent slurry flows from top to bottom and reacts with the flue gas flowing from the flue gas inlet 21 and flowing above the absorption zone 22. The absorbent slurry absorbs sulfur dioxide in the flue gas and then flows into the oxidation zone 23 after reducing the foam through the frother 223. Other gases in the flue gas continue to rise and are discharged from the exhaust port after the moisture is removed by the demister 222. The spray device 221, the demister 222, and the frother 223 can all refer to the relevant technology.

[0027] The oxidation zone 23 is provided with an air inlet 231 to blow oxygen-containing air into the oxidation zone, so that the calcium sulfite generated by the reaction of sulfur dioxide and absorbent and oxygen further react to generate calcium sulfate slightly soluble in water, i.e. gypsum. The slurry discharge pump 232 of the oxidation zone 23 is connected to the gypsum cyclone 31 of the gypsum dehydration device through a pipeline to perform preliminary dehydration of the gypsum slurry. The discharge port of the gypsum cyclone 31 is connected to the oxidation zone through a pipeline, and the separated liquid returns to the oxidation zone for recirculation; the slag discharge port of the gypsum cyclone 31 is connected to the dehydrator 32 to perform secondary dehydration of the gypsum. The dehydrator 32 can use a vacuum belt dehydrator. The dehydrated gypsum is discharged from the tail of the dehydrator. The discharge port of the dehydrator 32 is connected to the filtrate tank 33, and the dehydrated liquid enters the filtrate tank 33 for temporary storage. The filtrate tank 33 is also provided with an agitator to prevent precipitation. Furthermore, the filtrate pool 33 is provided with a filtrate pump, which is connected to the water pipe 111, the oxidation zone 23 and the foam collector 223 through pipelines, and is used for absorbent preparation, absorption tower supplementary water and foam collector water, so as to make full use of water resources.

[0028] The oxidation zone 23 is also provided with a buffer pump 234, which is connected to the buffer tank 24 through a pipeline, and the buffer tank 24 is provided with a delivery pump, which is connected to the oxidation zone 23 through a pipeline. When the absorption tower is undergoing emergency treatment such as accident handling and maintenance, the buffer pump 234 is opened to discharge the slurry in the oxidation zone to the buffer tank 24; after the absorption tower operates normally, the slurry is sent back to the oxidation zone 23 through the delivery pump. The buffer tank 24 is also provided with an agitator.

[0029] The above are one or more embodiments of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An absorbent preparation device, characterized in that: It includes a slurry preparation pool, an inclined chute connected to the slurry preparation pool, and a primary filter screen arranged between the inclined chute and the slurry preparation pool; a plurality of water pipes are arranged in sequence from high to low at the bottom of the inclined chute, a plurality of water nozzles are arranged on the side of the water pipe facing the primary filter screen, an anti-clogging baffle is arranged above the water nozzle, and the anti-clogging baffle protrudes from the water nozzle and extends toward the primary filter screen; the slurry preparation pool is provided with an agitator.

2. The absorbent preparation device according to claim 1, characterized in that: It also includes a transfer tank and a storage tank arranged on one side of the slurry preparation tank, and the tops of the transfer tank and the storage tank are respectively provided with a secondary filter screen and a tertiary filter screen; the slurry preparation tank is provided with a first absorbent transfer pump, and the first absorbent transfer pump is connected to the secondary filter screen through a pipeline, and the transfer tank is provided with a second absorbent transfer pump, and the second absorbent transfer pump is connected to the tertiary filter screen through a pipeline.

3. The absorbent preparation device according to claim 2, characterized in that: The transfer tank and the storage tank are both provided with agitators.

4. The absorbent preparation device according to claim 1, characterized in that: The plurality of water pipes are arranged horizontally.

5. The absorbent preparation device according to claim 1, characterized in that: The primary filter screen is an L-shaped grid.

6. A flue gas desulfurization system, comprising an absorbent preparation device, an absorption tower and a gypsum dehydration device, characterized in that: The absorbent preparation device is the absorbent preparation device according to any one of claims 1 to 5.

7. A flue gas desulfurization system according to claim 6, characterized in that: The absorption tower includes a flue gas inlet and an absorption zone and an oxidation zone respectively arranged above and below the flue gas inlet; the absorption zone includes multiple spray devices, a demister arranged above the spray device and an exhaust port arranged above the demister; the oxidation zone is provided with an air inlet fan, a slurry discharge pump and multiple circulation pumps; one of the circulation pumps is connected to one of the spray devices through a pipeline; the storage tank of the absorbent preparation device is provided with an absorbent delivery pump, and the absorbent delivery pump is connected to the oxidation zone through a pipeline.

8. A flue gas desulfurization system according to claim 7, characterized in that: The oxidation zone is also provided with a buffer pump, which is connected to a buffer tank through a pipeline. The buffer tank is provided with a delivery pump, which is connected to the oxidation zone through a pipeline. The buffer tank is provided with a stirrer.

9. A flue gas desulfurization system according to claim 7, characterized in that: The absorption zone also includes a foam catcher disposed below the spray device.

10. A flue gas desulfurization system according to claim 9, characterized in that: The gypsum dehydration device comprises a gypsum cyclone, a slurry discharge pump of the oxidation zone is connected to the gypsum cyclone through a pipeline, a slag discharge port of the gypsum cyclone is connected to a dehydrator, a liquid discharge port of the gypsum cyclone is connected to the oxidation zone through a pipeline, a liquid discharge port of the dehydrator is connected to a filtrate pool, a filtrate pool is provided with a filtrate pump, and the filtrate pump is respectively connected to a water pipe, an oxidation zone and a foam catcher through pipelines; and the filtrate pool is provided with an agitator.

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