CN213965554U

CN213965554U - Impurity removing device for ammonia desulphurization process

Info

Publication number: CN213965554U
Application number: CN202022899768.0U
Authority: CN
Inventors: 郭春生
Original assignee: Inner Mongolia Datang International Hexigten Coal Gas Co ltd
Current assignee: Inner Mongolia Datang International Hexigten Coal Gas Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-08-17
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses an edulcoration device for among ammonia process of desulfurization technology, including the cooling precipitation tank, the upper end of cooling precipitation tank is equipped with the feed liquor pipe, the lower extreme is equipped with steam intermediate layer and fluid-discharge tube, steam intermediate layer's one end is equipped with steam and advances the pipe, the other end downside is equipped with the steam wet return, set up steam coil pipe in the steam intermediate layer, steam coil pipe's entrance point and steam advance union coupling, the exit end is connected with the steam wet return, be equipped with the filter screen on the position of installation fluid-discharge tube in the cooling precipitation tank, one side outside of cooling precipitation tank is provided with the cylinder, the flexible end of cylinder stretches into in the cooling precipitation tank, and vertical the scraper blade of installing on the tip of flexible end, be provided with the row's cinder notch that flushes bottom of cooling precipitation tank on the opposite side of cooling precipitation tank, be provided with the baffle on the row's cinder notch. The utility model discloses can effectively get rid of ash content, silt, suspended solid and partial metal ion in the ammonium sulfate thick liquid, improve ammonia process desulfurization system stability, prolong operating duration.

Description

Impurity removing device for ammonia desulphurization process

Technical Field

The utility model belongs to the technical field of boiler flue gas desulfurization, especially, relate to an edulcoration device for among ammonia process of desulfurization.

Background

The flue gas desulfurization process mainly comprises a calcium method, an ammonia method, a seawater method and the like according to the classification of the absorbent. At present, the calcium method has the widest application range, but the calcium method has large occupied area of equipment, high energy consumption and difficult sale of byproduct gypsum, and most of the gypsum is discarded. The seawater desulfurization process is the most brief introduction, but can only be applied to seaside power plants. The ammonia desulphurization process has the advantages of small occupied area of equipment, low energy consumption, high desulphurization efficiency, large consumption of the byproduct ammonium sulfate as the raw material of the compound fertilizer and the like, and is more and more widely applied.

The ammonia desulphurization process principle is that ammonia reacts with sulfur dioxide in flue gas to produce ammonium sulfite, and the ammonium sulfite is forcedly oxidized into ammonium sulfate. However, ammonia water and industrial process water which are not completely purified are often used as raw materials in actual production, and these raw materials contain a large amount of impurities including H₂S, phenols, oils, insoluble substances, silt, suspended substances, various ions, and the like, and the flue gas also contains a large amount of smoke. In the normal production process, the impurities can be attached to ammonium sulfate crystals and are brought out of the system along with the production of the ammonium sulfate, namely, the ammonia desulphurization system has certain 'purification' capacity. However, if the impurities entering the system exceed the self purification capacity of the system, the impurities can be enriched in the system, so that ammonium sulfate slurry is turbid, crystals become thin, and finally the slurry is pasty, so that the system cannot normally operate and only can be drained for treatment.

The most direct and effective method for removing impurities in the ammonia desulfurization system is to discharge liquid outwards, discharge the slurry enriched with impurities and drive the vehicle with clean water. However, the method is only suitable for other working sections which can process the ammonium sulfate slurry, otherwise, the environmental pollution and the waste of fertilizer are caused, so the method for recycling the slurry after desulfurization and impurity removal is more suitable.

The conventional methods for removing impurities in ammonia desulfurization slurry mainly comprise resin adsorption, microporous filtration, plate-and-frame filter pressing and the like, but the methods generally have the problems of process equipment responsibility, complex operation, serious equipment corrosion, large investment, difficult maintenance and the like.

Disclosure of Invention

In view of this, the utility model aims at providing an edulcoration device for among ammonia process desulfurization technology, can effectively get rid of ash content, silt, suspended solid and partial metal ion in the ammonium sulfate thick liquid, improve ammonia process desulfurization system stability, extension operating duration.

In order to achieve the purpose of the utility model, the technical proposal is as follows:

an impurity removing device used in an ammonia desulphurization process comprises a cooling precipitation tank, wherein a liquid inlet pipe is arranged at the upper end of the cooling precipitation tank, a steam interlayer and a liquid discharge pipe are arranged at the lower end of the cooling precipitation tank, a steam inlet pipe is arranged at one end of the steam interlayer, a steam return pipe is arranged at the lower side of the other end of the steam interlayer, a steam coil pipe is arranged in the steam interlayer, the steam coil pipe is in an S-shaped trend in the steam interlayer along the length direction of the steam interlayer, the inlet end of the steam coil pipe is connected with the steam inlet pipe, the outlet end of the steam coil pipe is connected with the steam return pipe, a filter screen is arranged at the position of the liquid discharge pipe arranged in the cooling precipitation tank, an air cylinder is arranged outside one side of the cooling precipitation tank, the telescopic end of the air cylinder extends into the cooling precipitation tank, a scraper blade is vertically arranged at the end of the telescopic end, and the scraper blade is parallel to the left side and the right side of the cooling precipitation tank, be provided with the row's cinder notch that flushes with cooling settling tank bottom on the opposite side of cooling settling tank, be provided with the baffle on the row's cinder notch, the cooling settling tank lower extreme is located to incline to be provided with row's cinder plate in the position of row's cinder notch below, the below of row's cinder plate is provided with conveyor belt.

Preferably, the lower end of the scraper is in an inverted triangle shape, so that crystals at the bottom of the cooling settling tank can be scraped conveniently.

Preferably, a water distribution plate is arranged above the scraper in the cooling precipitation tank, and a plurality of water distribution holes are formed in the water distribution plate.

Preferably, a liquid inlet valve is arranged on the liquid inlet pipe, a liquid outlet valve is arranged on the liquid discharge pipe, a steam inlet valve is arranged on the steam inlet pipe, and a steam return valve is arranged on the steam return pipe.

Preferably, the size of the cooling precipitation tank is 5m × 1m × 0.3 m.

Preferably, the height of the steam jacket is set to 0.05 m.

Preferably, the pipe diameters of the liquid inlet pipe and the liquid outlet pipe are DN25, and the pipe diameters of the steam inlet pipe and the steam return pipe are DN 15.

The utility model has the advantages that: the utility model discloses equipment is simple, easily operation, be convenient for maintain, can effectively get rid of ash content, silt, suspended solid and partial metal ion in the ammonium sulfate thick liquid, improves ammonia desulfurization system stability, extension operating duration.

(2) The cooling of the ammonium sulfate slurry in the cooling precipitation tank can be accelerated by arranging the water replenishing plate;

(3) the air cylinder and the scraper plate are arranged, so that the dried crystals can be quickly conveyed out of the cooling precipitation tank;

(4) the lower end of the cooling precipitation tank is provided with a steam interlayer, a steam coil is arranged in the steam interlayer, and the precipitated crystals are dried by introducing steam into the steam coil.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a partial structural sectional view of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

As shown in fig. 1-2, an impurity removing device for ammonia desulfurization process comprises a cooling precipitation tank 1, a liquid inlet pipe 2 is arranged at the upper end of the cooling precipitation tank 1, a steam interlayer 3 and a liquid discharge pipe 4 are arranged at the lower end of the cooling precipitation tank 1, a steam inlet pipe 5 is arranged at one end of the steam interlayer 3, a steam return pipe 6 is arranged at the lower side of the other end of the steam interlayer 3, a steam coil 7 is arranged in the steam interlayer 3, the steam coil 7 is in an S-shaped trend along the length direction of the steam interlayer 3 in the steam interlayer 3, the inlet end of the steam coil 7 is connected with the steam inlet pipe 5, the outlet end of the steam coil is connected with the steam return pipe 6, a filter screen 8 is arranged at the position of the liquid discharge pipe 4 arranged in the cooling precipitation tank 1 for preventing crystals from entering the liquid discharge pipe 4, a cylinder is arranged outside one side of the cooling precipitation tank 1, and a telescopic end 9 of the cylinder extends into the cooling precipitation tank 1, and vertically install scraper blade 10 on the tip of flexible end 9, scraper blade 10 is parallel with the side of controlling of cooling precipitation tank 1, be provided with on the opposite side of cooling precipitation tank 1 and cool off 1 bottom flush row cinder notch 11, be provided with baffle 12 on row cinder notch 11, it is provided with row cinder plate 13 to cool off 1 lower extreme position in row cinder notch 11 below slope, the below of row cinder plate 13 is provided with conveyor belt 14.

The lower end of the scraper 10 is in an inverted triangle shape, so that crystals at the bottom of the cooling precipitation tank 1 can be scraped conveniently.

The steam-water separator is characterized in that a liquid inlet valve 15 is arranged on the liquid inlet pipe 2, a liquid outlet valve 16 is arranged on the liquid discharge pipe 4, a steam inlet valve 17 is arranged on the steam inlet pipe 5, and a steam return valve 18 is arranged on the steam return pipe 6.

The size of the cooling precipitation tank 1 is 5m multiplied by 1m multiplied by 0.3m, the height of the steam interlayer 3 is set to be 0.05m, the pipe diameters of the liquid inlet pipe 2 and the liquid discharge pipe 4 are DN25, and the pipe diameters of the steam inlet pipe 5 and the steam return pipe 6 are DN 15.

Example 2

Based on the structure of the embodiment 1, in the embodiment 2, the cooling precipitation tank 1 is provided with a water distribution plate 19 at a position above the scraper 10, and the water distribution plate 19 is provided with a plurality of water distribution holes 20.

The working principle is as follows:

periodically or when the color of the ammonium sulfate slurry is blackened, impurities are more and crystals are thinned, the clear liquid of the centrifuge is introduced into a cooling precipitation tank 1 through a liquid inlet pipe 2, the clear liquid is cooled and precipitated for 24 hours, and then the precipitated clear liquid is introduced back to a clear liquid pipe of the centrifuge through a liquid outlet pipe 4 by means of gravity; a steam coil 7 is arranged in the steam interlayer 3, crystals after cooling and precipitation in the precipitation tank 1 are heated and cooled by steam in the steam coil 7 for 5-8h, and then the steam is pressed by a steam return valve 18.

After the precipitated crystals are dried, the scraper 10 is driven by the air cylinder to horizontally move, the dried crystals are pushed to the slag discharging port 11, fall onto the conveying belt 14 through the slag discharging plate 13, are conveyed to the feeding barrel of the centrifuge, are dried again through the vulcanizing bed, and are packaged.

Due to the effects of cold crystallization and precipitation, the solution finally put into the cooling precipitation tank 1 is completely precipitated, the supernatant is clear and transparent, no visible impurities exist, the precipitated crystals are mixed into the ammonium sulfate finished product, no adverse effect exists, and the impurities existing in the ammonia desulphurization production can be effectively removed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, component separation or combination made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An impurity removal device for an ammonia desulphurization process comprises a cooling precipitation tank and is characterized in that: the upper end of the cooling precipitation tank is provided with a liquid inlet pipe, the lower end of the cooling precipitation tank is provided with a steam interlayer and a liquid discharge pipe, one end of the steam interlayer is provided with a steam inlet pipe, the lower side of the other end of the steam interlayer is provided with a steam return pipe, the steam interlayer is internally provided with a steam coil pipe, the steam coil pipe is in an S-shaped trend in the steam interlayer along the length direction of the steam interlayer, the inlet end of the steam coil pipe is connected with the steam inlet pipe, the outlet end of the steam coil pipe is connected with the steam return pipe, a filter screen is arranged at the position of the liquid discharge pipe arranged in the cooling precipitation tank, an air cylinder is arranged outside one side of the cooling precipitation tank, the telescopic end of the air cylinder extends into the cooling precipitation tank, a scraper blade is vertically arranged at the end of the telescopic end, the scraper blade is parallel to the left side surface and the right side surface of the cooling precipitation tank, and a slag discharge port which is flush with the bottom of the cooling precipitation tank is arranged on the other side surface of the cooling precipitation tank, the slag discharging port is provided with a baffle plate, the lower end of the cooling precipitation tank is obliquely arranged at a position below the slag discharging port and is provided with a slag discharging plate, and a conveying belt is arranged below the slag discharging plate.

2. The impurity removal device used in the ammonia desulphurization process according to claim 1, characterized in that: and a water distribution plate is arranged above the scraper in the cooling precipitation tank, and a plurality of water distribution holes are formed in the water distribution plate.

3. The impurity removal device used in the ammonia desulphurization process according to claim 1, characterized in that: the steam-water separator is characterized in that a liquid inlet valve is arranged on the liquid inlet pipe, a liquid outlet valve is arranged on the liquid outlet pipe, a steam inlet valve is arranged on the steam inlet pipe, and a steam return valve is arranged on the steam return pipe.

4. The impurity removal device used in the ammonia desulphurization process according to claim 1, characterized in that: the size of the cooling precipitation tank is 5m multiplied by 1m multiplied by 0.3 m.

5. The impurity removal device used in the ammonia desulphurization process according to claim 1, characterized in that: the height of the steam jacket was set to 0.05 m.

6. The impurity removal device used in the ammonia desulphurization process according to claim 1, characterized in that: the pipe diameter of the liquid inlet pipe and the liquid discharge pipe is DN25, and the pipe diameter of the steam inlet pipe and the pipe diameter of the steam return pipe are DN 15.