CN212855403U

CN212855403U - Restrain dust discharging equipment among limestone flour slurrying system

Info

Publication number: CN212855403U
Application number: CN202020901545.0U
Authority: CN
Inventors: 邓悦; 贾西部
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: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-04-02
Anticipated expiration: 2030-05-25

Abstract

The utility model discloses a dust discharge inhibiting device in a limestone powder pulping system, which comprises a sealed slurry tank, wherein the top of the slurry tank is provided with a feed hopper, and the slurry tank is communicated with a water seal tank through an overflow unit; the water seal box is also connected with the pit through a liquid discharge pipe; a double-layer stirrer is also arranged in the slurry tank. The utility model relates to a dust emission suppression device in a limestone powder pulping system, which can effectively suppress the problems of serious powder emission, bag pasting blockage of a bag-type dust collector and the like caused by the dust emission in the limestone powder pulping system, and ensures the effective utilization rate of limestone slurry through the collection of a water seal box; simple structure, easy to implement and low maintenance cost.

Description

Restrain dust discharging equipment among limestone flour slurrying system

Technical Field

The utility model belongs to the technical field of thermal power plant's environmental protection equipment, concretely relates to restrain dust discharging equipment among limestone flour slurrying system.

Background

At present, slurry preparation methods in a limestone-gypsum wet flue gas desulfurization system of a thermal power plant are divided into two methods: wet grinding pulping and dry powder pulping.

The dry powder pulping system mainly comprises a limestone powder bin, a powder bin fluidization fan, a rotary feeder, a feed hopper, a limestone slurry box, a stirrer, a slurry delivery pump and other equipment, wherein limestone powder is directly conveyed into the limestone slurry box by the feeder through the feed hopper and is mixed with process water or filtrate water to reach the required concentration (25-30%). The process often causes the upper part of the slurry tank to seriously emit powder, the prior countermeasure is mainly to install a bag-type dust remover on the slurry tank, and the bag-type dust remover on the upper part is seriously stuck and blocked because the limestone slurry tank is accompanied with wet steam in the pulping process; also, there is a treatment mode using a tubular demister and a plate demister with washing water, but in the actual operation process, the demisting efficiency of the demister is affected by the flow rate of flue gas. Because the air flow velocity in the slurry box is low, the demisting efficiency is difficult to guarantee, a large amount of scaling substances are attached to the surface of the demister, the space at the position is narrow, and the installation and implementation are difficult.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a restrain dust discharging equipment among limestone flour slurrying system has solved the current problem that blocks up seriously, the easy scale deposit in defroster surface and installation awkward of whitewashed equipment.

The technical scheme adopted by the utility model is that the device for inhibiting dust discharge in the limestone powder pulping system comprises a sealed slurry tank, wherein the top of the slurry tank is provided with a feed hopper, and the slurry tank is communicated with a water seal tank through an overflow unit; the water seal box is also connected with the pit through a liquid discharge pipe;

a double-layer stirrer is also arranged in the slurry tank.

The utility model is also characterized in that,

a drain valve is arranged on the drain pipe.

The overflow unit comprises an overflow pipe, one end of the overflow pipe is communicated with the slurry tank, and the other end of the overflow pipe is in threaded connection with a water seal joint and is communicated with the water seal tank;

the pipe wall of the overflow pipe is also connected with an emptying valve.

A plurality of jet pipes are uniformly distributed on the end surface of the water seal joint, and one end of each jet pipe penetrates out of the water seal joint.

Each jet pipe part penetrating out of the water seal joint is in an inverted cone shape, and the inner diameters of two ends of each jet pipe are respectively 0.1 time of the inner diameter of the water seal joint and 0.3 time of the inner diameter of the water seal joint.

The utility model has the advantages that: the utility model relates to a dust emission suppression device in a limestone powder pulping system, which can effectively suppress the problems of serious powder emission, bag pasting blockage of a bag-type dust collector and the like caused by the dust emission in the limestone powder pulping system, and ensures the effective utilization rate of limestone slurry through the collection of a water seal box; simple structure, easy to implement and low maintenance cost.

Drawings

FIG. 1 is a schematic structural diagram of a device for suppressing dust emission in a limestone powder pulping system according to the present invention;

FIG. 2 is a schematic structural diagram of an overflow unit in a device for suppressing dust emission in a limestone powder pulping system according to the present invention;

FIG. 3 is a top view of the water sealing joint in the device for restraining dust discharge in the limestone powder pulping system

FIG. 4 is a side view of the water sealing joint in the dust discharging device in the limestone powder slurrying system of the present invention.

In the figure, 1, a feed hopper, 2, a slurry tank, 3, a double-layer stirrer, 4, an overflow pipe, 5, a water seal tank, 6, a drain valve, 7, a drain pipe, 8, a pit, 9, an emptying valve, 10, a water seal joint and 11, a jet pipe.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model relates to a dust emission suppression device in a limestone powder pulping system, as shown in figure 1, comprising a sealed slurry tank 2, wherein the top of the slurry tank 2 is provided with a feed hopper 1, and the slurry tank 2 is communicated with a water seal tank 5 through an overflow unit; the water seal box 5 is also connected with a pit 8 through a liquid discharge pipe 7;

a double-layer stirrer 3 is also arranged in the slurry tank 2.

A drain valve 6 is arranged on the drain pipe 7.

As shown in fig. 2, the overflow unit comprises an overflow pipe 4, one end of the overflow pipe 4 is communicated with the slurry tank 2, and the other end of the overflow pipe 4 is in threaded connection with a water seal joint 10 and is communicated with a water seal tank 5; the pipe wall of the overflow pipe 4 is also connected with an emptying valve 9.

The water seal joint 10 is in threaded connection with the end part of the overflow pipe, so that the water seal joint 10 can be replaced at any time under the conditions that the jet pipe 11 in the water seal joint 10 is blocked and the like, and normal operation is guaranteed.

As shown in fig. 3 and 4, a plurality of jet pipes 11 are uniformly distributed on the end surface of the water seal joint 10, and the same end of all the jet pipes 11 penetrates through the water seal joint 10.

The part of each jet pipe 11 penetrating out of the water seal joint 10 is in an inverted cone shape, and the inner diameters of two ends of each jet pipe 11 are respectively 0.1 time of the inner diameter of the water seal joint 10 and 0.3 time of the inner diameter of the water seal joint 10.

The utility model relates to a restrain dust discharging equipment's working process among limestone flour slurrying system as follows:

limestone powder falls into feed hopper 1 through the batcher, gets into slurry tank 2, under the stirring effect of double-deck agitator 3, mixes into the thick liquid that mass concentration is 25% ~ 30% with the slurrying water, for effectively preventing 2 top of slurry tank flies excessive dust and carries the wet steam blowout, sets up overflow pipe 4, sets up atmospheric valve 9 on overflow pipe 4, divide into two kinds of operating modes:

when the slurry tank 2 starts to work and the internal pressure is higher, the pressure is released outwards from the overflow pipe 4, the emptying valve 9 is communicated with the atmosphere, and the emptying valve 9 is attached to the pipe wall of the overflow pipe 4 to seal the overflow unit and the pipeline thereof because the internal pressure is higher than the atmospheric pressure;

when the liquid level of the slurry tank 2 is reduced, the internal pressure of the slurry tank 2 is reduced, the pressure is released outwards from the overflow pipe 4, the emptying valve 9 is communicated with the atmosphere, and the atmospheric pressure enables the emptying valve 9 to bounce to release the internal pressure of the overflow pipe 4 because the internal pressure is smaller than the atmospheric pressure.

When wet steam carried by dust passes through the overflow pipe 4, the liquid-solid mixture in the overflow pipe 4 flows to the water seal tank 5 along the jet pipe 11 in the water seal joint 10, and the liquid-solid mixture passing through the jet pipe 11 falls into the water seal tank 5 to form jet flow due to the effect of reducing, so that the bubbling stirring effect is achieved, and the slurry is further uniformly mixed;

the water seal tank 5 periodically enters a pit 8 through a liquid discharge valve 6 and a liquid discharge pipe 7, and slurry in the pit 8 is returned to the limestone slurry tank for recycling through a limestone slurry pit pump.

The utility model relates to a dust emission suppression device in a limestone powder pulping system, which can effectively suppress the problems of serious powder emission, bag pasting blockage of a bag-type dust collector and the like caused by the dust emission in the limestone powder pulping system, and ensures the effective utilization rate of limestone slurry through the collection of a water seal box 5; the structure is simple, the implementation is easy, and the maintenance cost is low; in the use process, in order to prevent the overflow pipe from being blocked, the pipeline can be periodically flushed with process water.

Claims

1. The device for inhibiting dust discharge in the limestone powder pulping system is characterized by comprising a sealed slurry tank (2), wherein the top of the slurry tank (2) is provided with a feed hopper (1), and the slurry tank (2) is communicated with a water seal tank (5) through an overflow unit; the water seal box (5) is also connected with a pit (8) through a liquid discharge pipe (7);

and a double-layer stirrer (3) is also arranged in the slurry tank (2).

2. The device for inhibiting dust emission in the limestone powder pulping system according to claim 1, wherein a liquid discharge valve (6) is arranged on the liquid discharge pipe (7).

3. The device for inhibiting dust emission in the limestone powder pulping system according to claim 1, wherein the overflow unit comprises an overflow pipe (4), one end of the overflow pipe (4) is communicated with the slurry tank (2), and the other end of the overflow pipe (4) is in threaded connection with a water seal joint (10) and is communicated with a water seal tank (5);

the pipe wall of the overflow pipe (4) is also connected with an emptying valve (9).

4. The device for inhibiting dust emission in the limestone powder pulping system according to claim 3, wherein a plurality of jet pipes (11) are uniformly distributed on the end surface of the water seal joint (10), and the same end of each jet pipe (11) penetrates out of the water seal joint (10).

5. The device for inhibiting dust emission in the limestone powder pulping system according to claim 4, wherein each part of the jet pipe (11) penetrating out of the water seal joint (10) is in an inverted cone shape, and the inner diameters of two ends of the jet pipe (11) are respectively 0.1 time of the inner diameter of the water seal joint (10) and 0.3 time of the inner diameter of the water seal joint (10).