CN211328838U

CN211328838U - Dredging device for desulfurization system

Info

Publication number: CN211328838U
Application number: CN201922051532.9U
Authority: CN
Inventors: 贾西部; 马强; 郭静娟; 黄鑫; 康秦豪; 袁园
Original assignee: Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Current assignee: Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-08-25
Anticipated expiration: 2029-11-25

Abstract

The utility model relates to the field of thermal power plant desulfurization, in particular to a dredging device used in a desulfurization system; the dredging device is arranged between the limestone slurry tank and the desulfurization absorption tower, one end of the dredging device is connected with an inlet of the limestone slurry tank, the other end of the dredging device is connected with the limestone slurry supply pump, and the dredging device comprises a slurry inlet pipe, a slurry outlet pipe, a limestone slurry separator and a dredging tank; the process continuously discharges the sediment particles out of the desulfurization system in a dredging mode in the operation process of the desulfurization system, so that the sediment particles are prevented from entering the absorption tower body, and the sediment amount at the bottom of the absorption tower is greatly reduced. Although the operation cost is increased and the maintenance cost of the newly added equipment is slightly increased, the abrasion of a slurry circulating system is reduced, the overhaul and maintenance period of the system is prolonged, the sediment disposal cost is reduced, and the overhaul time is shortened.

Description

Dredging device for desulfurization system

Technical Field

The utility model relates to a desulfurization field of thermal power plant, concretely relates to dredge device for among desulfurization system.

Background

The limestone-gypsum wet desulphurization system generally has the phenomenon of sediment accumulation at the bottom of the absorption tower, wherein one part of sediment particles are limestone particles which do not meet the grinding requirement, the other part of the sediment particles are silica crystals which are doped in limestone ore and are not easy to grind, and a large amount of sediment is accumulated at the bottom of the absorption tower; on the other hand, the continuous deposition of large solid particles reduces the volume of a slurry pool of the absorption tower, thereby bringing certain risks to the stable operation of the desulfurization system. On the other hand, in the machine set shutdown maintenance process, the sediment at the bottom of the absorption tower needs to be cleaned manually, so that the workload of machine set maintenance is greatly increased, and the maintenance period is prolonged.

The sediment in the limestone slurry is deposited in a box body without selectivity, sediment accumulation can also be carried out at the bottom of a limestone slurry box matched with the desulfurization system, the accumulation amount of the sediment is mainly determined by the elevation of an inlet pipeline of a limestone slurry supply pump, when the accumulation amount of the sediment at the bottom of the limestone slurry box reaches the upper limit, sediment particles are accumulated at the bottom of an absorption tower, the accumulation amount of the sediment in the absorption tower mainly depends on the usage amount of limestone and the fineness of limestone powder, the limestone powder with the same standard in unit time is larger, and the accumulation amount of the sediment is larger. The same limestone dosage in unit time, the worse the limestone powder fineness, the larger the accumulation amount of the sediment. Meanwhile, the elevation of the gypsum slurry discharge pump also has certain influence, but because the section of the absorption tower is overlarge, the deposition height and the shape of the sediments at the bottom of the absorption tower are related to the installation position of the inlet of the slurry circulating pump and the output of the stirrer of the absorption tower.

SUMMERY OF THE UTILITY MODEL

To the problem mentioned in the prior art, the utility model provides a reducible sediment volume increases the mediation device that is arranged in desulfurization system of extension slurry circulation system operating cycle.

The utility model relates to a dredge device for in desulfurization system, the device of dredging is installed between limestone slurry case and desulfurization absorption tower, dredge device one end and limestone slurry case entry link to each other, the other end links to each other with limestone slurry supply pump, its characterized in that, the device of dredging includes into thick liquid pipe, play thick liquid pipe, limestone slurry separator and dredge the jar; the lime stone slurry separation ware top is equipped with the baffle along vertical direction, and the baffle is with inside left cavity and the right cavity that divide into of lime stone slurry separation ware, and wherein, left cavity communicates with right cavity bottom, left cavity links to each other with advancing the thick liquid pipe, and right cavity links to each other with a grout outlet pipe, and lime stone slurry separation ware bottom links to each other with dredging tank deck portion, dredges the tank bottoms portion and links to each other with the dewatering belt feeder in the desulfurization system, still be equipped with first agitator in the lime stone slurry separation ware, dredge and still be equipped with the second agitator in the jar.

Preferably, the limestone slurry separator can be arranged in a cylinder or a cube, the bottom of the limestone slurry separator is funnel-shaped, and a stop valve is further arranged on a pipeline connecting the limestone slurry separator and the dredging tank.

Preferably, the first stirrer is obliquely arranged, and a stirring shaft on the first stirrer forms an included angle of 45 degrees with the central axis of the limestone slurry separator.

Preferably, the horizontal plane of the mounting position of the slurry outlet pipe and the horizontal plane of the bottommost part of the partition plate belong to the same horizontal plane.

Preferably, the second stirrer is a propeller stirrer, and the radius of the propeller stirrer gradually decreases from the top to the bottom of the dredging tank.

Preferably, the device further comprises a flushing pipeline which is communicated with the dredging tank.

Preferably, the slurry inlet pipe is also provided with a slurry pump.

Compared with the prior art, the utility model, following technological effect has been gained:

the process continuously discharges the sediment particles out of the desulfurization system in a dredging mode in the operation process of the desulfurization system, so that the sediment particles are prevented from entering the absorption tower body, and the sediment amount at the bottom of the absorption tower is greatly reduced. Although the operation cost is increased and the maintenance cost of the newly added equipment is slightly increased, the abrasion of a slurry circulating system is reduced, the overhaul and maintenance period of the system is prolonged, the sediment disposal cost is reduced, and the overhaul time is shortened.

Drawings

Fig. 1 is an installation schematic diagram of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Reference numerals: 1-limestone slurry tank; 2-dredging means; 3-limestone slurry supply pump; 4-slurry pump; 5-a pulp inlet pipe; 6-a separator; 7-limestone slurry separator; 8-a first stirrer; 9-a stop valve; 10-dredging tank; 11-a second stirrer; 12-flushing the pipeline; 13-slurry outlet pipe; 14-dewatering belt conveyer.

Detailed Description

Examples

The utility model relates to a dredging device for among desulfurization system, as shown in fig. 1 and fig. 2, dredging device 2 is installed between limestone slurry case 1 and desulfurization absorption tower, dredging device 2 one end links to each other with limestone slurry case 1 entry, and the other end links to each other with limestone slurry supply pump 3, dredging device 2 includes into thick liquid pipe 5, play thick liquid pipe 13, limestone slurry separator 7, dredging tank 10 and dehydration belt feeder 14; 7 tops of limestone slurry separator are equipped with baffle 6 along vertical direction, and baffle 6 is with 7 inside left cavities and the right cavity that divide into of limestone slurry separator, and wherein, left cavity and right cavity bottom intercommunication, left cavity with advance thick liquid pipe 5 and link to each other, right cavity links to each other with play thick

liquid pipe

13, 7 bottoms of limestone slurry separator with dredge jar 10 tops and link to each other, dredge jar 10 bottoms and desulfurization system in dehydration belt feeder 14 and link to each other, still be equipped with first agitator 8 in the limestone slurry separator 7, dredge still be equipped with second agitator 11 in the jar 10. The first stirrer 8 is obliquely arranged, and an included angle of 45 degrees is formed between a stirring shaft on the first stirrer 8 and the central axis of the limestone slurry separator 7.

In this embodiment, two cavities that divide into two the inside of limestone slurry separator 7 through baffle 6 that sets up, advance thick liquid pipe 5 and go out thick liquid pipe 13 and connect left cavity and right cavity respectively, advance thick liquid pipe 5 in this embodiment and prefer from the top connection, thus, can form the U type flow direction when the limestone slurry gets into in limestone slurry separator 7 when advancing thick liquid pipe 5, can guarantee that the limestone slurry reaches certain settling time, also avoid the limestone slurry to carry to the absorption tower because of coming too late settlement simultaneously, the homogeneity of limestone slurry can be guaranteed effectively to first agitator 8 of setting, screen through stirring, let the large granule sediment in the limestone slurry be located the bottom deposit, normal thick liquid is carried to the desulfurization absorption tower through going out thick liquid pipe 13, the stirring effect of first agitator 8 that the slope set up simultaneously is better.

The limestone slurry separator 7 can be arranged in a cylinder or a cube, the bottom of the limestone slurry separator is funnel-shaped, a stop valve 9 is further arranged on a pipeline connecting the limestone slurry separator 7 and the dredging tank 10, the funnel-shaped structure in the embodiment can further improve the settling time of limestone solution, but the liquid level of limestone slurry cannot be lower than the lowest point of the partition plate 6, the stop valve 9 is opened and closed in normal operation, settled slag is conveyed into the dredging tank 10, limestone slurry separated at the other side can be conveyed into the desulfurization absorption tower through the slurry outlet pipe 13,

the horizontal plane of the mounting position of the slurry outlet pipe 13 and the horizontal plane of the bottommost part of the clapboard 6 belong to the same horizontal plane.

The second stirrer 11 is a propeller stirrer, and the radius of the propeller stirrer gradually decreases from the top to the bottom of the dredging tank 10. The first stirrer 8 and the second stirrer 11 in the present embodiment are of a structure commonly used in the prior art, and will not be described herein.

The device also comprises a flushing pipeline 12, wherein the flushing pipeline 12 is communicated with the dredging tank 10. When the dredging tank 10 is blocked, the stop valve 9 is closed, and the sediment can be conveyed to the dewatering belt conveyor 14 through the arranged flushing pipeline 12 by means of the impact force of the process water.

The slurry inlet pipe 5 is also provided with a slurry pump 4.

The utility model discloses when using, the limestone slurry who comes from among the limestone slurry case 1 passes through slurry pump 4 and carries to the left cavity in the limestone slurry separator 7 along advancing thick liquid pipe 5, the limestone slurry of continuous transport is filtered through the stirring of first agitator 8 and is subsided, normally open stop valve 9, can utilize gravity to flow to dredging in the jar 10 with the sediment in the limestone solution, but the liquid level of limestone solution can not be less than 6 the minimum of baffle, the limestone solution after the separation can be carried to the desulfurization absorption tower from the play thick liquid pipe 13 of right cavity, the sediment gets into to dredging in the jar 10, usable second agitator 11 stirs, carry the sediment to dehydration 14 in, when dredging jar 10 leads to the jam because of the sediment, closed stop valve 9, can open flushing pipe 12 and dredge with the help of the impact force of process water.

Claims

1. A dredging device used in a desulfurization system, the dredging device (2) is installed between a limestone slurry tank (1) and a desulfurization absorption tower, one end of the dredging device (2) is connected with an inlet of the limestone slurry tank (1), and the other end is connected with a limestone slurry supply pump (3), and the dredging device (2) is characterized by comprising a slurry inlet pipe (5), a slurry outlet pipe (13), a limestone slurry separator (7) and a dredging tank (10);

lime stone slurry separator (7) top is equipped with baffle (6) along vertical direction, and baffle (6) are with lime stone slurry separator (7) inside divide into left cavity and right cavity, and wherein, left cavity communicates with right cavity bottom, left cavity links to each other with advancing thick liquid pipe (5), and right cavity links to each other with play thick liquid pipe (13), and lime stone slurry separator (7) bottom links to each other with dredging jar (10) top, dredges jar (10) bottom and desulfurization system in dehydration belt feeder (14) link to each other, still be equipped with first agitator (8) in lime stone slurry separator (7), still be equipped with second agitator (11) in dredging jar (10).

2. The dredging device for use in the desulfurization system according to claim 1, wherein the limestone slurry separator (7) is cylindrical or cubic and has a funnel-shaped bottom, and a stop valve (9) is further disposed on the pipeline connecting the limestone slurry separator (7) and the dredging tank (10).

3. The dredging device for use in desulfurization system according to claim 2, wherein the first stirrer (8) is installed obliquely, and the stirring shaft of the first stirrer (8) forms an angle of 45 ° with the central axis of the limestone slurry separator (7).

4. The dredging device for use in desulfurization system according to claim 3, wherein the slurry outlet pipe (13) is installed at a level that is the same as the level of the bottom of the partition (6).

5. The dredging device for use in desulfurization system according to claim 4, wherein the second agitator (11) is a propeller agitator with a propeller radius that gradually decreases from the top to the bottom of the dredging tank (10).

6. The dredging device for use in desulfurization system according to claim 5, further comprising a flushing pipe (12), wherein said flushing pipe (12) is in communication with the dredging tank (10).

7. The dredging device for use in desulfurization system according to claim 6, wherein the slurry inlet pipe (5) is further installed with a slurry pump (4).