阅读说明：本技术 一种处理焦亚硫酸钠干燥过程产生粉尘的装置及方法 (Device and method for treating dust generated in sodium metabisulfite drying process ) 是由 汪伟国 张维帮 于 2020-11-11 设计创作，主要内容包括：本发明公开了一种处理焦亚硫酸钠干燥过程产生粉尘的装置及方法,包括壳体(1),进料口(2),用于水解所述粉尘中焦亚硫酸钠粉体的设置于所述壳体(1)的下部第一喷淋区(3)和设置于所述壳体(1)中部的第二喷淋区(4),设置于所述壳体(1)的上部的高温分解区(5),设置于所述第一喷淋区(3)下端的用于排出水解液的出液口(6),设置于所述高温分解区上端的用于排出干燥尾气的出气口(7)和设置于所述出气口(7)处的引风机(8)。本发明减少了粉尘污染,减少了原料的浪费,增加了焦亚硫酸钠的最终产量,提高了经济效益。(The invention discloses a device and a method for treating dust generated in a sodium metabisulfite drying process, and the device comprises a shell (1), a feed inlet (2), a first spraying area (3) arranged at the lower part of the shell (1) and a second spraying area (4) arranged in the middle of the shell (1) and used for hydrolyzing sodium metabisulfite powder in the dust, a pyrolysis area (5) arranged at the upper part of the shell (1), a liquid outlet (6) arranged at the lower end of the first spraying area (3) and used for discharging hydrolysate, a gas outlet (7) arranged at the upper end of the pyrolysis area and used for discharging dry tail gas and an induced draft fan (8) arranged at the gas outlet (7). The invention reduces dust pollution, reduces the waste of raw materials, increases the final yield of sodium metabisulfite and improves economic benefits.)

1. The utility model provides a handle device that sodium metabisulfite drying process produced dust which characterized in that: the device comprises a shell (1), a feed inlet (2) which is connected with a sodium metabisulfite drying device and used for introducing dust, a first spraying area (3) which is arranged at the lower part of the shell (1) and a second spraying area (4) which is arranged at the middle part of the shell (1) and used for hydrolyzing sodium metabisulfite powder in the dust, a pyrolysis area (5) which is arranged at the upper part of the shell (1), a liquid outlet (6) which is arranged at the lower end of the first spraying area (3) and used for discharging hydrolysis liquid, a gas outlet (7) which is arranged at the upper end of the pyrolysis area (5) and used for discharging dry tail gas and a draught fan (8) which is arranged at the gas outlet (; the upper parts of the first spraying area (3) and the second spraying area (4) are respectively provided with a spraying device for spraying liquid, and the lower part of the pyrolysis area (5) is provided with a heating tube plate.

2. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: and a heat insulation layer is arranged on the outer side of the shell (1).

3. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: and an air blower (9) for blowing dust into the first spraying area (3) is arranged at the feed inlet (2).

4. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: the volume of the first spraying area (3) is 1/3-1/2 of the volume of the shell (1), and the volume of the pyrolysis area (5) is 1/4-1/3 of the volume of the shell (1).

5. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: the spray liquid is hot water.

6. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: the temperature of the spraying liquid in the first spraying area (3) is 80-100 ℃, and the temperature of the spraying liquid in the second spraying area (4) is 35-95 ℃.

7. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: the first spraying area (3), the second spraying area (4) and the pyrolysis area (5) are communicated with each other.

8. The apparatus for treating dust generated in the drying process of sodium metabisulfite as claimed in claim 1, wherein: the temperature of the hot air in the forced air drying area is 130-200 ℃.

9. A method of treating dust generated during the drying of sodium metabisulfite using the apparatus of claim 1, comprising the steps of: the dust generated after drying is pumped by a blower (9) and enters the first spraying area (3) through the feed inlet (2) for hydrolysis, and formed hydrolysis liquid drops fall to the bottom of the first spraying area (3) for collection; a small part of unhydrolyzed dust is pumped into the second spraying area (4) for further hydrolysis in the induced draft fan (8), and formed hydrolysis liquid drops fall to the bottom of the first spraying area (3) for collection; the residual dust and the evaporated moisture are pumped into the pyrolysis zone (5) by the induced draft fan (8) for decomposition and evaporation, and then are discharged through an exhaust port, and the collected hydrolysate is used as mother liquor to return to continuously generate the sodium metabisulfite.

Technical Field

The invention relates to the technical field of sodium metabisulfite production, in particular to a device and a method for treating dust generated in the drying process of sodium metabisulfite.

Background

Sodium metabisulfite, also known as sodium metabisulfite, is a white or yellow crystalline powder or small crystal, an important sulfite. In the food industry as bleaching agents, preservatives, bulking agents, antioxidants, colour protection agents and preservatives; chloroform, phenyl sulfone and benzaldehyde are produced in the pharmaceutical industry; the textile industry is used as dechlorinating agent and cotton scouring assistant after cotton cloth bleaching. The leather-making industry is used for leather treatment, and can make leather soft, plump and tough, and has the properties of water resistance, folding resistance, wear resistance and the like. The chemical industry is used for producing hydroxy vanillin, hydroxylamine hydrochloride and the like. The photosensitive industry is used as developers and the like.

In the prior art, sodium pyrosulfite is directly dried by a hot air drying method. The drying of sodium metabisulfite sends the wet material into the drying equipment bottom through the auger delivery ware, is blown hot-air into the desicator by the air-blower, through high-speed motion in drying equipment of hot-air, drives thermal transmission to reach the purpose of dry material. Although the high-speed flow of hot air has realized the dry purpose of the wet material of sodium metabisulfite, also wrap up and hold some sodium metabisulfite powder simultaneously and discharge into the external environment from the gas outlet, cause dust pollution, cause the sodium metabisulfite loss, reduced holistic production efficiency.

The utility model discloses a utility model patent that application number is 201620003999.x discloses a sodium metabisulfite doublestage drying device, this the utility model discloses a sodium metabisulfite doublestage drying device, including hot-blast furnace, spiral feeder, silo, one-level fluidized bed dryer, gas distribution board, overflow weir, second grade fluidized bed dryer, cyclone, pocket type dust remover, draught fan and spiral discharger, the air admission hot-blast furnace becomes hot-blast, hot-blast entering from one-level fluidized bed dryer left side lower part, the silo setting is on spiral feeder, spiral feeder connects the left side at one-level fluidized bed dryer, one-level fluidized bed dryer bottom is provided with gas distribution board, this the utility model discloses with low costs and drying effect is good. In the drying device of the utility model, the bag type dust collector is connected to the top of the cyclone separator to treat the dust generated by drying, but the air circulation capacity of the bag type dust collector is obviously reduced along with the accumulation of the dust on the surface of the filter cloth, the machine needs to be stopped to remove the dust when a certain amount of dust is accumulated, and the difficulty of dust removal operation is higher; in addition, because the sodium metabisulfite is easy to absorb moisture, the phenomenon of dewing and even mildewing appears on the filter material of the bag-type dust remover. In conclusion, how to effectively treat the dust generated in the drying process of sodium metabisulfite becomes a difficult problem to be solved urgently.

Disclosure of Invention

The invention aims to solve the problems and provide a device for processing dust generated in the sodium metabisulfite drying process, which can efficiently recover effective components in the dust in the sodium metabisulfite drying process and increase the yield of a sodium metabisulfite finished product.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a device for treating dust in the drying process of sodium metabisulfite comprises a shell, a feed inlet, a first spraying area, a second spraying area, a pyrolysis area, a liquid outlet, a gas outlet and a draught fan, wherein the feed inlet is connected with a sodium metabisulfite drying device and is used for introducing dust, the first spraying area is arranged at the lower part of the shell and is used for hydrolyzing sodium metabisulfite powder in the dust, the second spraying area is arranged in the middle of the shell, the pyrolysis area is arranged at the upper part of the shell, the liquid outlet is arranged at the lower end of the first spraying area and is used for discharging hydrolysate, the gas outlet is arranged at the; and the upper parts of the first spraying area and the second spraying area are respectively provided with a spraying device for spraying liquid, and the lower part of the pyrolysis area is provided with a heating tube plate.

The invention discloses a device for treating dust generated in the drying process of sodium metabisulfite, which is arranged by combining the characteristics of the dust generated in the drying process of the sodium metabisulfite, so that the effective components in the dust can be efficiently recycled, the waste of raw materials is reduced, the yield of a finished product of the sodium metabisulfite is increased, and the production benefit is increased. The device adopts a partition arrangement and comprises a first spraying area, a second spraying area and a high-temperature decomposition area, and because the solubility of sodium metabisulfite in water is increased along with the increase of the temperature, the temperature of the spraying liquid in the first spraying area is higher than that of the second spraying liquid, so that the sodium metabisulfite in dust is completely hydrolyzed in the first spraying area as far as possible; the temperature of the second spraying area is set to be lower than that of the first spraying area due to the low content of the residual small part of the unhydrolyzed sodium metabisulfite, and the spraying liquid in the first spraying area is evaporated to enter the second spraying area, so that the energy consumption for heating the spraying liquid in the second spraying area is further reduced due to the certain temperature in the second spraying area; the pyrolysis zone decomposes remaining dust that contains few part sodium metabisulfite again under the high temperature, and the tail gas processing apparatus recycle for the sulfur dioxide of generation is used for sodium metabisulfite's production again.

Preferably, the outer side of the shell is provided with an insulating layer.

Preferably, the feeding port is provided with a blower for blowing the dust into the first spraying area.

Preferably, the volume of the first spraying area is 1/3-1/2 of the volume of the shell, and the volume of the pyrolysis area is 1/4-1/3 of the volume of the shell.

Preferably, the spray liquid is hot water.

Preferably, the temperature of the spraying liquid in the first spraying area is 80-100 ℃, and the temperature of the spraying liquid in the second spraying area is 35-95 ℃.

Preferably, the first spraying area, the second spraying area and the pyrolysis area are communicated with each other.

Preferably, the temperature of the hot air in the forced air drying zone is 130-200 ℃.

Another object of the present invention is to provide a method for treating dust generated in the drying process of sodium metabisulfite by using the above apparatus, comprising the steps of:

the dust generated after drying is pumped by an air blower and enters the first spraying area through the feed inlet for hydrolysis, and formed hydrolysis liquid drops fall to the bottom of the first spraying area for collection; pumping a small part of unhydrolyzed dust into the second spraying area for further hydrolysis in the induced draft fan, and dropping formed hydrolysis liquid to the bottom of the first spraying area for collection; the residual dust and the evaporated moisture are pumped into the pyrolysis zone by the induced draft fan for decomposition and evaporation and then discharged through an exhaust port, and the collected hydrolysate is used as mother liquor to return to continue to participate in the production of the sodium metabisulfite.

The invention has the following beneficial effects:

1. the invention discloses a device for treating dust generated in the drying process of sodium metabisulfite, which is arranged by combining the characteristics of the dust generated in the drying process of the sodium metabisulfite, so that the effective components in the dust can be efficiently recycled, the waste of raw materials is reduced, the yield of a finished product of the sodium metabisulfite is increased, and the production benefit is increased.

2. The device provided by the invention adopts a partition arrangement, comprises a first spraying area, a second spraying area and a pyrolysis area, and the temperatures of the spraying liquid in the first spraying area and the second spraying area are set according to the self-solubility characteristic of sodium metabisulfite, so that the effective components in dust are fully recovered, and the energy consumption is reduced; the high-temperature decomposition area decomposes the remaining dust containing a small amount of sodium metabisulfite at high temperature to generate sulfur dioxide to be discharged, and the discharge amount of the sulfur dioxide meets the discharge standard. The pollution of dust to the environment is reduced, and the working environment of production personnel is optimized.

3. The hydrolysis reaction of the sodium metabisulfite is reversible, so that the collected hydrolysate is returned to the production flow to continuously produce the sodium metabisulfite, the production efficiency is increased, the waste of raw materials is reduced, and the economic benefit of production is improved.

Drawings

FIG. 1 is a schematic diagram of an apparatus for treating dust generated during the drying of sodium metabisulfite;

wherein, 1 is the casing, 2 is the feed inlet, 3 is first spraying district, 4 is the second spraying district, 5 is pyrolysis district, 6 is the liquid outlet, 7 is the gas outlet, 8 is the draught fan, 9 is the air-blower.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed in use of products of the present invention, which are merely used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Example 1

As shown in fig. 1, a device for processing dust generated in a sodium metabisulfite drying process comprises a shell 1, a feed inlet 2 connected with a sodium metabisulfite drying device and used for introducing dust, a first spraying area 3 arranged at the lower part of the shell 1 and a second spraying area 4 arranged at the middle part of the shell 1 and used for hydrolyzing sodium metabisulfite powder in the dust, a pyrolysis area 5 arranged at the upper part of the shell 1, a liquid outlet 6 arranged at the lower end of the first spraying area 3 and used for discharging hydrolysate, a gas outlet 7 arranged at the upper end of the pyrolysis area 5 and used for discharging dry tail gas and an induced draft fan 8 arranged at the gas outlet 7; the upper parts of the first spraying area 3 and the second spraying area 4 are respectively provided with a spraying device for spraying liquid, the spraying device is provided with a plurality of spraying openings, and the lower part of the pyrolysis area 5 is provided with a heating tube plate. The heating medium adopted by the heating tube plate is kerosene. And a control valve is arranged at the liquid outlet 6, and when the hydrolysate is accumulated to a certain volume in the first spraying area 3, the control valve is opened to discharge the hydrolysate.

And a heat insulation layer is arranged on the outer side of the shell 1.

And an air blower 9 for blowing dust into the first spraying area 3 is arranged at the position of the feed port 2.

The volume of the first spraying area 3 is 1/3-1/2 of the volume of the shell 1, and the volume of the pyrolysis area 5 is 1/4-1/3 of the volume of the shell 1.

The spray liquid is hot water.

The temperature of the spraying liquid in the first spraying area 3 is 80-100 ℃, and the temperature of the spraying liquid in the second spraying area 4 is 35-95 ℃.

The first spraying area 3, the second spraying area 4 and the pyrolysis area 5 are communicated with each other.

The temperature of the hot air in the forced air drying area is 130-200 ℃.

A method for processing dust generated in the drying process of sodium metabisulfite by using the device comprises the following steps: the dust generated after drying is pumped by a blower 9 and enters the first spraying area 3 through the feed inlet 2 for hydrolysis, and formed hydrolysis liquid drops fall to the bottom of the first spraying area 3 for collection; a small part of unhydrolyzed dust is pumped into the second spraying area 4 for further hydrolysis in the induced draft fan 8, and formed hydrolysis liquid drops fall to the bottom of the first spraying area 3 for collection; the residual dust and the evaporated moisture are pumped into the pyrolysis zone 5 by the induced draft fan 8 for decomposition and evaporation and then discharged through an exhaust port, and the collected hydrolysate is used as mother liquor to return to continuously generate the sodium metabisulfite.

The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the claims of the present invention.