Production device and production system of desulfurized ammonium sulfate

Abstract

The utility model relates to the technical field of ammonium sulfate treatment, in particular to a production device and a production system of desulfurized ammonium sulfate. The utility model discloses a desulfurized ammonium sulfate production device and system. The desulfurized ammonium sulfate production device comprises a desulfurization tower, the desulfurization tower is connected to a ground tank, a discharge port of the ground tank is connected to a filter press and the desulfurization tower, and a liquid outlet of the filter press is connected to the ground tank; and a discharge port of the filter press desulfurization tower is connected to the cyclone. According to the production device and the production system for desulfurized ammonium sulfate, through the oxidation tank and the filter press, the dust removal pressure of the cloth dust remover is relieved, coal ash in slurry is removed, and the whiteness of ammonium sulfate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonium sulfate disposal, in particular to a production device and a production system for desulfurized ammonium sulfate. Background Art

[0002] At present, desulfurization treatment is carried out in the boiler workshop. The process is as follows: after the hot flue gas of the boiler is dust-removed by the bag filter, it is sent to the desulfurization tower by the boiler induced draft fan to contact with the sprayed ammonium sulfate solution in countercurrent. In this process, the water in the ammonium sulfate solution is adiabatically evaporated, so that the hot flue gas is cooled from 130°C to 55°C. At the same time, part of the smoke dust in the flue gas is also washed and removed. The ammonium sulfate solution is concentrated due to adiabatic evaporation. When the ammonium sulfate solution is concentrated to supersaturation, the ammonium sulfate continues to crystallize and grow in the washing circulation tank of the desulfurization tower. When the ammonium sulfate solution crystallizes to a solid content of 10% to 20%, the ammonium sulfate slurry is pumped to the ammonium sulfate process cyclone for solid-liquid separation.

[0003] Since the boiler uses a bag filter for dust removal, the bags may fall off or break during operation. When the dusty flue gas enters the desulfurization tower, the dust will be washed into the desulfurization slurry. When the dust-containing slurry crystallizes, the dust precipitates with the crystals. After drying, the dust-containing crystals will form ammonium sulfate solids with low whiteness and excessive water-insoluble matter, forming stagnant materials and causing waste of resources.

[0004] Therefore, it is necessary to provide a production device and a production system for removing dust impurities from the desulfurization slurry and improving the whiteness of desulfurized ammonium sulfate. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a production device and a production system for desulfurized ammonium sulfate. The production device is provided with a filter press to allow the dust leaked from the cloth dust collector to enter the desulfurization system, and the fly ash in the slurry is removed, thereby improving the whiteness of the ammonium sulfate.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] On the one hand, the present application provides a production device for desulfurized ammonium sulfate, comprising a desulfurization tower, the desulfurization tower is connected to a ground trough, the discharge port of the ground trough is connected to a filter press and the desulfurization tower, and the liquid outlet of the filter press is connected to the ground trough;

[0008] The discharge port of the filter press desulfurization tower is connected to the cyclone.

[0009] Preferably, the discharge port of the desulfurization tower is connected to the feed port of the filter press.

[0010] Preferably, the cyclone is connected to a centrifuge.

[0011] More preferably, the centrifuge is connected to a dryer.

[0012] Preferably, it also includes an oxidation tank; the discharge port of the desulfurization tower is connected to the feed port of the oxidation tank; the discharge port of the oxidation tank is connected to another feed port of the desulfurization tower.

[0013] Preferably, the discharge port of the desulfurization tower is connected to the feed port of the oxidation tank and the feed port of the ground trough; the discharge port of the ground trough is connected to the feed port of the oxidation tank and the feed port of the filter press.

[0014] Preferably, the feed inlet of the desulfurization tower is connected to a dust collector; the dust collector is used to receive hot flue gas from the boiler.

[0015] Preferably, the liquid outlet of the cyclone is connected to a ground trough.

[0016] More preferably, the liquid outlet of the centrifuge is connected to a ground tank.

[0017] More preferably, the ammonium sulfate after drying in the dryer has a whiteness of ≥80%.

[0018] On the other hand, the present application provides a desulfurized ammonium sulfate production system, including the production device described above, and the production device can transfer materials by setting corresponding pumps.

[0019] The beneficial effects of the utility model are:

[0020] 1. Improved the whiteness of ammonium sulfate

[0021] The production device of the present application removes the coal ash in the desulfurization tower and the oxidation tank through a filter press, so that the whiteness of the ammonium sulfate solid is significantly improved to more than 80%, thereby greatly improving the quality of the ammonium sulfate product.

[0022] 2. Realize the recycling of resources

[0023] The production device of the present application, the ground trough, filter press, cyclone, centrifuge and other equipment realize the recycling of slurry, which not only improves the resource utilization efficiency but also reduces the production cost.

[0024] 3. Reduce the dust removal pressure of bag dust collector

[0025] The production device of the present application introduces a filter press, which effectively removes the coal ash in the flue gas, thereby reducing the content of coal ash in the desulfurization slurry and improving the whiteness of ammonium sulfate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1This is a schematic diagram of the structure of the production device described in this application;

[0028] Figure 2 This is a schematic diagram of the production device described in this application when in operation;

[0029] Among them: 1. Desulfurization tower; 2. Ground trough; 3. Filter press; 4. Cyclone; 5. Centrifuge; 6. Dryer; 7. Oxidation tank; 8. Dust collector. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0031] As used herein, "and / or" includes any and all combinations of one or more associated listed items. The terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an", "an" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise. It is further understood that "including", when used in this specification, specifies the stated features, integers, steps, operations, elements and / or compositions, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, compositions and / or combinations thereof.

[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by ordinary technicians in the technical field to which the utility model belongs. It is further understood that terms, such as defined in commonly used dictionaries, are interpreted in accordance with their meanings in the context of the relevant field, and are not idealized or overly formal meanings, unless explicitly defined as such herein.

[0033] The exemplary utility model described herein may appropriately lack any one or more element limitations that are not specifically disclosed herein. Therefore, the terms "comprise", "include", "contain", etc. should be understood broadly and non-restrictively. In addition, the terminology used herein is used as a description, not a limitation, and it is unintentional to use these terminology expressions that do not include any equivalent characteristics, but only describe some of their characteristics, but various modifications are possible within the scope of the utility model according to the rights. Therefore, although the utility model has been specifically disclosed through preferred embodiments and optional features, the modifications disclosed herein to embody the changes of the utility model may be recorded by those skilled in the art, and such modifications and changes will be considered to be within the scope of the utility model.

[0034] In the current desulfurization treatment of boiler workshops, the combination of bag filters and desulfurization towers is mainly relied on to remove harmful substances in flue gas. Bag filters have a good removal effect on large particles of smoke during the dust removal process, but when the ash content in the flue gas is too high, it is easy to cause clogging and leakage of the bag, resulting in a decrease in dust removal effect. At the same time, when the ammonium sulfate solution sprayed in the desulfurization tower absorbs sulfur dioxide in the flue gas, the presence of ash will cause the solid whiteness of the ammonium sulfate solution crystallized to decrease, forming stagnant material, which not only affects the quality of the ammonium sulfate product, but also causes a waste of resources.

[0035] To this end, provide Figure 1 A desulfurized ammonium sulfate production device is shown, comprising a desulfurization tower 1, the desulfurization tower 1 is connected to a ground trough 2, the discharge port of the ground trough 2 is connected to a filter press 3 and the desulfurization tower 1, and the liquid outlet of the filter press 3 is connected to the ground trough 2;

[0036] The discharge port of the desulfurization tower 1 of the filter press 3 is connected to the cyclone 4 .

[0037] Specifically, in the present application, a liquid outlet of the desulfurization tower is connected to the ground trough, and the desulfurization tower is used to countercurrently contact with the hot flue gas of the boiler, and the flue gas is cooled and washed to remove part of the smoke dust during this process. The ground trough is used to receive the slurry discharged from the desulfurization tower, and its outlet is connected to the filter press and the desulfurization tower (oxidation tank), so as to realize the recycling of the slurry.

[0038] The filter press separates the solid from the liquid in the slurry by filtering, effectively removing the fly ash in the slurry and improving the whiteness of ammonium sulfate. At the same time, the liquid outlet of the filter press is connected to the ground trough, realizing the recycling of liquid (filtrate, washing water).

[0039] In one embodiment, a discharge port of the desulfurization tower 1 can be directly connected to a feed port of the filter press 3 .

[0040] In one embodiment, the cyclone 4 is connected to a centrifuge 5. In the present application, the combination of the cyclone and the centrifuge has the following functions: the cyclone is used to further separate the solid and liquid in the slurry, and its discharge port is connected to the centrifuge, and the centrifuge completely separates the solid and liquid through the centrifugal force generated by high-speed rotation, thereby improving the separation effect.

[0041] In one embodiment, the centrifuge 5 is connected to the dryer 6; specifically, the discharge port of the centrifuge is connected to the feed port of the dryer; in the present application, the ammonium sulfate solid after centrifugal separation is sent to the dryer for drying treatment to ensure the drying effect of the ammonium sulfate.

[0042] In one embodiment, the production device further includes an oxidation tank 7; the discharge port of the desulfurization tower 1 is connected to the feed port of the oxidation tank 7; and the discharge port of the oxidation tank 7 is connected to another feed port of the desulfurization tower 1.

[0043] In this application, the purpose of introducing the oxidation tank is: in order to further improve the quality of ammonium sulfate, the oxidation tank is introduced into the production device. Specifically, the discharge port of the desulfurization tower is connected to the feed port of the oxidation tank. After the slurry is oxidized in the oxidation tank, it returns to the desulfurization tower for recycling. In this way, not only the whiteness of ammonium sulfate is improved, but also the recycling of the slurry is realized.

[0044] In one embodiment, the discharge port of the desulfurization tower 1 is connected to the feed port of the oxidation tank 7 and the feed port of the ground trough 2; the discharge port of the ground trough 2 is connected to the feed port of the oxidation tank 7 and the feed port of the filter press 3.

[0045] In one embodiment, the feed inlet of the desulfurization tower 1 is connected to a dust collector 8; the dust collector 8 is used to receive the hot flue gas from the boiler.

[0046] In one embodiment, the liquid outlet of the cyclone 4 is connected to the ground tank 2. The liquid outlet of the centrifuge 5 is connected to the ground tank 2.

[0047] In one embodiment, the ammonium sulfate dried in the dryer 6 has a whiteness of ≥80%.

[0048] The whiteness of ammonium sulfate after drying in the dryer reaches or exceeds 80%, which greatly improves the product quality.

[0049] like Figure 2 The specific operation process of the production device shown is as follows:

[0050] 1. Flue gas pretreatment

[0051] First, the hot flue gas from the boiler passes through a pre-treatment stage (dust removal), which usually includes dust removal. The purpose of dust removal is to remove large particles of dust and impurities from the flue gas to ensure that the subsequent desulfurization process is more effective.

[0052] 2. Contact between flue gas and desulfurizer

[0053] The flue gas after dust removal enters the desulfurization tower. In the desulfurization tower, the flue gas is countercurrently contacted with the ammonium sulfate solution sprayed from the top of the tower. In this process, the sulfur dioxide in the flue gas reacts with the ammonia in the ammonium sulfate solution to generate ammonium sulfite liquid, which can effectively remove sulfur dioxide in the flue gas.

[0054] 3. Oxidation of ammonium sulfite

[0055] The generated ammonium sulfite liquid is then transported to the oxidation tank, where it reacts with oxygen in the air and is oxidized into ammonium sulfate solution. This process is usually carried out under certain temperature and pH conditions to ensure the smooth progress of the reaction.

[0056] If the dust or fly ash content in the ammonium sulfite liquid is high, causing the ammonium sulfite liquid to be obviously gray or black, the ammonium sulfite slurry is introduced into the filter press for filtration; the filtered ammonium sulfite liquid is discharged into the ground trough; and then the ammonium sulfite liquid filtered by the filter press is sent to the oxidation tank through the ground trough for oxidation reaction.

[0057] 4. Crystallization and separation of ammonium sulfate

[0058] The oxidized ammonium sulfate solution enters the desulfurization tower and obtains ammonium sulfate crystals through evaporation and crystallization. Subsequently, solid-liquid separation is completed through a cyclone and a centrifuge to obtain an ammonium sulfate filter cake.

[0059] After separation in the cyclone, the obtained liquid can be introduced into the filter press, and then introduced into the trough through the filter press, and can also be returned to the desulfurization tower (for use as make-up water), thereby improving the utilization rate of the waste liquid.

[0060] 5. Drying of wet ammonium sulfate

[0061] The ammonium sulfate filter cake is then sent to a dryer for drying. The temperature and humidity need to be controlled during the drying process to prevent the ammonium sulfate crystals from agglomerating. The dried ammonium sulfate is the finished product and can be packaged for storage or further processing.

[0062] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A production device for desulfurized ammonium sulfate, comprising a desulfurization tower (1), characterized in that: The desulfurization tower (1) is connected to the ground trough (2), the discharge port of the ground trough (2) is connected to the filter press (3) and the desulfurization tower (1), and the liquid outlet of the filter press (3) is connected to the ground trough (2); The discharge port of the desulfurization tower (1) of the filter press (3) is connected to the cyclone (4).

2. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: The discharge port of the desulfurization tower (1) is connected to the feed port of the filter press (3).

3. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: The cyclone (4) is connected to a centrifuge (5).

4. A production device for desulfurized ammonium sulfate according to claim 3, characterized in that: The centrifuge (5) is connected to a dryer (6).

5. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: Also includes an oxidation tank (7); The discharge port of the desulfurization tower (1) is connected to the feed port of the oxidation tank (7); the discharge port of the oxidation tank (7) is connected to another feed port of the desulfurization tower (1).

6. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: The discharge port of the desulfurization tower (1) is connected to the feed port of the oxidation tank (7) and the feed port of the ground trough (2); the discharge port of the ground trough (2) is connected to the feed port of the oxidation tank (7) and the feed port of the filter press (3).

7. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: The feed inlet of the desulfurization tower (1) is connected to a dust collector (8); The dust collector (8) is used to receive hot flue gas from the boiler.

8. A production device for desulfurized ammonium sulfate according to claim 1, characterized in that: The liquid outlet of the cyclone (4) is connected to the ground trough (2).

9. A production device for desulfurized ammonium sulfate according to claim 3, characterized in that: The liquid outlet of the centrifuge (5) is connected to the ground tank (2).

10. A production system for desulfurized ammonium sulfate, characterized in that: A production device comprising any one of claims 1 to 9.

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