CN115645970A - External ammonium sulfate crystallization auxiliary device and process - Google Patents
External ammonium sulfate crystallization auxiliary device and process Download PDFInfo
- Publication number
- CN115645970A CN115645970A CN202211290299.XA CN202211290299A CN115645970A CN 115645970 A CN115645970 A CN 115645970A CN 202211290299 A CN202211290299 A CN 202211290299A CN 115645970 A CN115645970 A CN 115645970A
- Authority
- CN
- China
- Prior art keywords
- external
- crystallization tank
- crystallization
- ammonium sulfate
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Fertilizers (AREA)
Abstract
The invention relates to the technical field of coke oven gas ammonia recovery, in particular to an external ammonium sulfate crystallization auxiliary device and process. The device comprises an external crystallization tank, an external crystallization tank circulating pump, an external crystallization tank liquid level meter, an adjusting valve and a flowmeter; an ammonium sulfate slurry pipeline at the outlet of the ammonium sulfate crystallization tank of the saturator is provided with a first branch pipeline connected with the inlet of the external crystallization tank, and a regulating valve and a flowmeter are arranged on the first branch pipeline; an ammonium sulfate mother liquor pipeline at the inlet of the ammonium sulfate crystallization tank of the saturator is provided with a second branch pipeline connected with the inlet of the external crystallization tank; the external crystallization tank liquid level meter is arranged on the external crystallization tank; an inlet of the external crystallization tank circulating pump is connected with the first pipeline through a pipeline, and an outlet of the external crystallization tank circulating pump is connected with the external crystallization tank through a pipeline. The residual ammonium sulfate crystals which cannot be timely processed by the ammonium sulfate crystallization tank of the saturator are sent into the external crystallization tank, so that space is provided for the continuous growth of the crystals, the crystallization time is prolonged, and the product quality is ensured while the crystallization processing amount is increased.
Description
Technical Field
The invention relates to the technical field of coke oven gas ammonia recovery, in particular to an external ammonium sulfate crystallization auxiliary device and process.
Background
In the process of purifying the coal gas, the ammonia in the coal gas is absorbed by sulfuric acid to prepare ammonium sulfate, which is one of important chemical products produced in large scale in a coking plant.
Most large-scale coking plants in China adopt a saturator method to produce ammonium sulfate. The plant throughput of the saturator is generally determined by the gas throughput. The yield of ammonium sulfate is influenced by the gas treatment amount and also depends on the ammonia content in the gas, and the ammonia content in the gas is greatly influenced by the previous process and the raw material components, so even though the gas treatment amount in the same scale is different, the crystallization time of a crystallization chamber at the lower part of a saturator is insufficient.
Too short a crystallization time may result in crystals of small ammonium sulfate particles not having sufficient time to grow to the desired size, thereby degrading product quality. The degree of crystallization in the mother liquor is generally expressed in terms of the crystal ratio, i.e., the volume of crystals contained in the mother liquor as a percentage of the total volume of the mother liquor and crystals.
The crystal ratio is properly controlled, and when the crystal ratio is too high, the reaction volume of ammonia and sulfuric acid is relatively reduced, the absorption of ammonia is not facilitated, the stirring resistance of mother liquor is increased, the poor stirring of the mother liquor is caused, and the equipment is blocked. Generally, when the crystal ratio reaches 30%, the material is extracted, and when the crystal ratio is reduced to 10%, the material is stopped. When the ammonia content in the coal gas is increased sharply due to the problems of the prior production or raw materials, under the same crystallization time, when the size of the crystallized particles is smaller, the crystal ratio of the mother solution is very high, so that the material is forced to be extracted for drying, and the product quality is reduced. The reason for the drastic change of the ammonia content in the gas may be temporary or permanent.
Temporary ammonia content fluctuations are unpredictable at the beginning of the design for a newly built ammonium sulfate unit, and thus, if the equipment is blindly scaled up, unnecessary capital and energy waste will result. For the old ammonium sulfate unit, the permanent ammonium sulfate treatment capacity is larger than the design treatment capacity of equipment due to the process adjustment or raw material change after the ammonium sulfate unit is put into operation, but the traditional treatment method only can stop production and change a saturator, and the transformation cost and difficulty are high. .
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an external ammonium sulfate crystallization auxiliary device and process, which are used for feeding residual ammonium sulfate crystals which cannot be timely processed by an ammonium sulfate crystallization tank of a saturator into an external crystallization tank, so that space is provided for the continuous growth of the crystals, the crystallization time is prolonged, the crystallization processing amount is increased, and the product quality is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
an external ammonium sulfate crystallization auxiliary device comprises an external crystallization tank (1), an external crystallization tank circulating pump (2), an external crystallization tank liquid level meter (3), an adjusting valve (4) and a flowmeter (5); an ammonium sulfate slurry pipeline at the outlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a first branch pipeline which is connected with the inlet of the external crystallization tank (1), and the regulating valve (4) and the flowmeter (5) are arranged on the first branch pipeline; an ammonium sulfate mother liquor pipeline at the inlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a second branch pipeline connected with the inlet of the external crystallization tank (1); the external crystallization tank liquid level meter (3) is arranged on the external crystallization tank (1); an inlet of the external crystallization tank circulating pump (2) is connected with the first pipeline through a pipeline, and an outlet of the external crystallization tank circulating pump (2) is connected with the external crystallization tank (1) through a pipeline.
Further, the external crystallization tank (1) and the saturator ammonium sulfate crystallization tank (6) are connected in parallel through a pipeline.
Further, the external crystallization tank (1) and the saturator ammonium sulfate crystallization tank (6) are connected in series through a pipeline.
Furthermore, the upper part and the lower part of the external crystallization tank (1) are connected with an external crystallization tank circulating pump (2) through pipelines.
Further, the regulating valve (4) is interlocked with a flow meter (5), the flow meter (5) regulates and controls the regulating valve (4), and the full flow groove liquid level meter (7) interlocks and controls the regulating valve (4).
An auxiliary process for external crystallization of ammonium sulfate specifically comprises the following steps:
1) If the crystallization particles in the ammonium sulfate crystallization tank (6) of the saturator are smaller than the material lifting requirement, the crystallization pump (8) starts to supply materials to the external crystallization tank (1), and the external crystallization tank circulating pump (2) does not work at the moment;
when the crystallization pump (8) stops feeding the external crystallization tank (1), the external crystallization tank circulating pump (2) starts to work at the moment, and mother liquor is circularly stirred;
2) When the liquid level meter (3) of the external crystallization tank displays that the liquid level is higher than the extraction opening of the external crystallization circulating pump (2) and higher than a set alarm value, the external crystallization circulating pump (2) extracts materials (c) from the upper part of the external crystallization tank (1) and supplies materials (d) from the bottom of the external crystallization tank (1), and the internal part of the external crystallization tank (1) is circularly stirred to prevent bottom stacking;
3) When the liquid level meter (3) of the external crystallization tank displays that the liquid level is lower than a set value, the material (a) is pumped from the bottom of the external crystallization tank (1), and the material (b) is fed from the top of the external crystallization tank (1);
4) When the material needs to be extracted from the external crystallization tank (1), closing an inlet valve from the saturator (9) to the crystallization pump (8), opening an inlet valve from the external crystallization tank (1) to the crystallization pump (8), and sending the mother liquor to the ammonium sulfate crystallization tank (6) of the saturator through the crystallization pump (8);
5) When the ammonium sulfate crystallization tank (6) of the saturator and the external crystallization tank (1) are operated in parallel, full-flow mother liquor of the two crystallization tanks returns to the saturator (9) together;
when the serial operation is carried out, the full-flow mother liquor of the ammonium sulfate crystallization tank (6) of the saturator enters the external crystallization tank (1) and then flows back to the saturator (9) fully, so that the crystallization time is prolonged;
6) Meanwhile, when feeding materials to the ammonium sulfate crystallization tank (6) and the external crystallization tank (1) of the saturator, the proportional relation is manually set and controlled according to the actual production condition; the regulating valve (4) is controlled in an interlocking way through the full flow groove liquid level meter (7), and the regulating valve (4) is cut off when the liquid level of the full flow groove is lower than a set value, so that the water seal requirement of the full flow groove is ensured.
Compared with the prior art, the invention has the beneficial effects that:
1. the method does not influence the original process, is only started when the original equipment cannot meet the treatment requirement, and is in a standby state in other time, thereby saving energy and increasing the running stability and the operation flexibility of the device.
2. The capacity-expanding transformation of the old device without stopping production can be realized, the original equipment does not need to be transformed, the transformation time is short, the investment of additional equipment is less, and the method is easy to realize.
3. Can realize the series or parallel operation with the original crystallization tank, and is flexible and variable.
4. The matched external crystallization tank circulating pump can realize circulating disturbance on the mother liquor in the crystallization tank when the materials are not lifted, promote crystallization and prevent equipment from being blocked.
5. According to the liquid level condition, the crystallization pump is switched to pump materials and feed positions, and the operation is stable.
6. The regulating valve and the flowmeter are arranged, and the feeding flow can be automatically controlled according to the production condition.
7. The regulating valve and the full-flow liquid level meter are interlocked and cut off, and the safety and stability of production are ensured.
8. The occupied area of the equipment is small, the number of external crystallization tanks can be continuously increased according to production requirements, and the equipment is flexible and variable.
Drawings
FIG. 1 is a schematic diagram of the structure and process of the present invention.
In the figure: 1-external crystallization tank 2-external crystallization tank circulating pump 3-external crystallization tank liquid level meter 4-regulating valve 5-flowmeter 6-saturator ammonium sulfate crystallization tank 7-full flow tank liquid level meter 8-crystallization pump 9-saturator
Detailed Description
The invention discloses an external ammonium sulfate crystallization auxiliary device and process. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The following further describes embodiments of the present invention in conjunction with the attached figures:
as shown in figure 1, the external ammonium sulfate crystallization auxiliary device comprises an external crystallization tank (1), an external crystallization tank circulating pump (2), an external crystallization tank liquid level meter (3), an adjusting valve (4) and a flowmeter (5). The ammonium sulfate slurry pipeline at the outlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a first branch pipeline connected with the inlet of the external crystallization tank (1), and the regulating valve (4) and the flowmeter (5) are arranged on the first branch pipeline. An ammonium sulfate mother liquor pipeline at the inlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a second branch pipeline connected with the inlet of the external crystallization tank (1). The external crystallization tank liquid level meter (3) is arranged on the external crystallization tank (1). An inlet of the external crystallization tank circulating pump (2) is connected with the first pipeline through a pipeline, and an outlet of the external crystallization tank circulating pump (2) is connected with the external crystallization tank (1) through a pipeline.
Further, the external crystallization tank (1) is connected with the ammonium sulfate crystallization tank (6) of the saturator in parallel through a pipeline. The volume of ammonium sulfate crystallization equipment is increased, so that the ammonium sulfate crystallization time can be flexibly adjusted according to the actual production condition.
Further, the external crystallization tank (1) is connected with the ammonium sulfate crystallization tank (6) of the saturator in series through a pipeline. Multistage crystallization of the particles can be achieved.
Furthermore, the upper part and the lower part of the external crystallization tank (1) are connected with an external crystallization tank circulating pump (2) through pipelines. And (3) adjusting the feeding mode of the external circulating pump (2) according to the liquid level condition shown by the external crystallization tank liquid level meter (3), and selecting to feed from the upper part or the lower part.
Furthermore, the regulating valve (4) is interlocked with the flowmeter (5), the flowmeter (5) regulates and controls the regulating valve (4), and the full flow groove liquid level meter (7) interlocks and controls the regulating valve (4). The flowmeter (5) interlockingly adjusts the flow of the material entering the external crystallization tank (1) through the adjusting valve (4) according to the actual production condition; the full-flow groove liquid level meter (7) adjusts and controls the regulating valve (4) to prevent the full-flow groove from meeting the water sealing requirement, and the automatic and stable operation of the system can be realized.
An auxiliary process for external crystallization of ammonium sulfate specifically comprises the following steps:
when the crystal ratio of the saturator (9) is too high and the crystal particles are less than the material lifting requirement, the crystallization pump starts to supply materials to the external crystallization tank (1), and the external crystallization tank circulating pump (2) does not work; when the crystallization pump stops feeding to the external crystallization tank (1), the external crystallization tank circulating pump (2) starts working at the moment, mother liquor is circularly stirred, crystallization is promoted, and the problem of difficult material lifting caused by excessive accumulation of crystals is prevented.
Meanwhile, when the external crystallization tank liquid level meter (3) displays that the liquid level is higher than the pumping outlet of the external crystallization circulating pump (2) and higher than a set alarm value, the external crystallization circulating pump (2) pumps materials (c) from the upper part of the external crystallization tank (1), and supplies materials (d) from the bottom of the external crystallization tank (1) to effectively circulate and stir the inside of the external crystallization tank (1) so as to prevent bottom stacking.
When the liquid level meter (3) of the external crystallization tank displays that the liquid level is lower than a set value, the material (a) is pumped from the bottom of the external crystallization tank (1) and the material (b) is fed from the top of the external crystallization tank (1). Through external crystallization circulating pump (2) work pipeline of liquid level switching, both can realize effectively stirring to the crystallization, can guarantee again that the system is stable, prevent that the crystallization tank liquid level from crossing can't taking out the material when low.
When the material needs to be extracted from the external crystallization tank (1), an inlet valve from the saturator to the crystallization pump (8) is closed, an inlet valve from the external crystallization tank (1) to the crystallization pump (8) is opened, and the mother liquor is sent to the original crystallization tank through the crystallization pump.
The ammonium sulfate crystallization tank (6) of the saturator and the external crystallization tank (1) can realize series or parallel operation. When the parallel operation is carried out, the full-flow mother liquor of the two crystallization tanks returns to the saturator together; when the serial operation is carried out, the full-flow mother liquor of the ammonium sulfate crystallization tank (6) of the saturator enters the external crystallization tank (1) and then flows back to the saturator (9) fully, so that the crystallization time is prolonged.
The process is provided with a regulating valve (4) and a flowmeter (5), can simultaneously feed materials to a saturator ammonium sulfate crystallization tank (6) and an external crystallization tank (1), and manually sets and controls the proportional relation according to the actual production condition. The regulating valve (4) is controlled in an interlocking way through the full flow groove liquid level meter (7), and the regulating valve (4) is cut off when the liquid level of the full flow groove is lower than a set value, so that the water seal requirement of the full flow groove is ensured, and the automatic, safe and stable operation of the system is ensured.
The ammonia content in the coal gas is greatly influenced by the prior process and the raw material components, and when the ammonium sulfate crystallization yield exceeds the designed processing capacity of equipment, the ammonium sulfate crystallization time is shortened, so that ammonium sulfate crystallization particles are too small, and the product quality is reduced. The invention is an external ammonium sulfate crystallization auxiliary process, and residual ammonium sulfate crystals which cannot be processed in time by the original device are sent into an external crystallization tank, so that space is provided for the continuous growth of the crystals, the crystallization time is prolonged, the crystallization processing amount is increased, and the product quality is ensured. For a newly-built device, the process can be used as auxiliary equipment for increasing the operation flexibility; for the existing device, the reconstruction without stopping production can be realized. The invention has the obvious advantages of simple, perfect and reasonable process, easy operation, low cost, less investment, energy conservation and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. An external ammonium sulfate crystallization auxiliary device is characterized by comprising an external crystallization tank (1), an external crystallization tank circulating pump (2), an external crystallization tank liquid level meter (3), an adjusting valve (4) and a flowmeter (5); an ammonium sulfate slurry pipeline at the outlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a first branch pipeline which is connected with the inlet of the external crystallization tank (1), and the regulating valve (4) and the flowmeter (5) are arranged on the first branch pipeline; an ammonium sulfate mother liquor pipeline at the inlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a second branch pipeline connected with the inlet of the external crystallization tank (1); the external crystallization tank liquid level meter (3) is arranged on the external crystallization tank (1); an inlet of the external crystallization tank circulating pump (2) is connected with the first pipeline through a pipeline, and an outlet of the external crystallization tank circulating pump (2) is connected with the external crystallization tank (1) through a pipeline.
2. The external ammonium sulfate crystallization auxiliary device as claimed in claim 1, wherein the external crystallization tank (1) is connected with the saturator ammonium sulfate crystallization tank (6) in parallel through a pipeline.
3. The external ammonium sulfate crystallization auxiliary device as claimed in claim 1, wherein the external crystallization tank (1) is connected in series with the ammonium sulfate crystallization tank (6) of the saturator through a pipeline.
4. The external crystallization auxiliary device of ammonium sulfate according to claim 1, wherein the upper part and the lower part of the external crystallization tank (1) are connected with an external crystallization tank circulating pump (2) through pipelines.
5. The external ammonium sulfate crystallization auxiliary device as claimed in claim 1, characterized in that the regulating valve (4) is interlocked with a flow meter (5), the flow meter (5) regulates and controls the regulating valve (4), and the overflow tank level gauge (7) interlocks and controls the regulating valve (4).
6. An external ammonium sulfate crystallization auxiliary process based on the external ammonium sulfate crystallization auxiliary device of any one of claims 1 to 5, which is characterized by comprising the following steps of;
1) If the crystallization particles in the ammonium sulfate crystallization tank (6) of the saturator are smaller than the material lifting requirement, the crystallization pump (8) starts to supply materials to the external crystallization tank (1), and the external crystallization tank circulating pump (2) does not work at the moment;
when the crystallization pump (8) stops feeding the external crystallization tank (1), the external crystallization tank circulating pump (2) starts to work at the moment, and mother liquor is circularly stirred;
2) When the liquid level meter (3) of the external crystallization tank displays that the liquid level is higher than the extraction opening of the external crystallization circulating pump (2) and higher than a set alarm value, the external crystallization circulating pump (2) extracts materials (c) from the upper part of the external crystallization tank (1) and supplies materials (d) from the bottom of the external crystallization tank (1), and the internal part of the external crystallization tank (1) is circularly stirred to prevent bottom stacking;
3) When the liquid level meter (3) of the external crystallization tank displays that the liquid level is lower than a set value, the material (a) is pumped from the bottom of the external crystallization tank (1) and the material (b) is fed from the top of the external crystallization tank (1);
4) When the material needs to be extracted from the external crystallization tank (1), closing an inlet valve from the saturator (9) to the crystallization pump (8), opening an inlet valve from the external crystallization tank (1) to the crystallization pump (8), and sending the mother liquor to the ammonium sulfate crystallization tank (6) of the saturator through the crystallization pump (8);
5) When the ammonium sulfate crystallization tank (6) of the saturator and the external crystallization tank (1) are operated in parallel, full-flow mother liquor of the two crystallization tanks returns to the saturator (9) together;
when the serial operation is carried out, the full-flow mother liquor of the ammonium sulfate crystallization tank (6) of the saturator enters the external crystallization tank (1) and then flows back to the saturator (9) fully, so that the crystallization time is prolonged;
6) Meanwhile, when feeding materials into the ammonium sulfate crystallization tank (6) and the external crystallization tank (1) of the saturator, the proportional relation is manually set and controlled according to the actual production condition; the regulating valve (4) is controlled in an interlocking way through the full flow groove liquid level meter (7), and the regulating valve (4) is cut off when the liquid level of the full flow groove is lower than a set value, so that the water seal requirement of the full flow groove is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211290299.XA CN115645970A (en) | 2022-10-21 | 2022-10-21 | External ammonium sulfate crystallization auxiliary device and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211290299.XA CN115645970A (en) | 2022-10-21 | 2022-10-21 | External ammonium sulfate crystallization auxiliary device and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115645970A true CN115645970A (en) | 2023-01-31 |
Family
ID=84989818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211290299.XA Pending CN115645970A (en) | 2022-10-21 | 2022-10-21 | External ammonium sulfate crystallization auxiliary device and process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115645970A (en) |
-
2022
- 2022-10-21 CN CN202211290299.XA patent/CN115645970A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114259961A (en) | System and method for improving capacity of lithium battery anode material precursor and regulating and controlling particle size distribution of precursor | |
| US11629077B2 (en) | Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method | |
| CN115645970A (en) | External ammonium sulfate crystallization auxiliary device and process | |
| CN218653061U (en) | External crystallization auxiliary device of ammonium sulfate | |
| CN217724643U (en) | Succinic acid continuous cascade crystallization system | |
| JP2021512639A (en) | Equipment and methods for continuously saturate-filling xylose mother liquor to remove impurities | |
| CN215781608U (en) | Carbazole system of refining | |
| CN213738939U (en) | Sewage treatment device capable of controlling product crystal size | |
| CN212688083U (en) | Alga and fish protein composite liquid biological stimulator preparation device | |
| CN209222132U (en) | A kind of automated production equipment of aluminum sulfate water-purifying material | |
| CN110184171A (en) | A kind of mono- two-phase anaerobic digestion device of perishable organic matter | |
| CN211897004U (en) | Continuous neutralization system of xylose hydrolysate | |
| CN112251602A (en) | Method and device for preparing mixed rare earth chloride by continuous extraction and transformation of rare earth sulfate | |
| CN220287159U (en) | A prevent blockking up automatic regulation and control device for long-distance transport mortar | |
| CN220000039U (en) | Full-automatic fertilizer tank | |
| CN205061595U (en) | Prevent stifled embrane method denitrification facility | |
| CN216837576U (en) | Continuous production equipment for choking cavitator | |
| CN213253068U (en) | Maleic anhydride catalyst production and rectification equipment with good safety performance | |
| CN220834163U (en) | System for prolonging operation period of soda production mother liquor ammonia distillation tower | |
| CN110882635B (en) | Sodium sulfite solution preparation tank and preparation system for chlor-alkali | |
| CN218811997U (en) | Tombarthite air stirring deposits device | |
| CN219010103U (en) | Aluminum ash recovery brine removes calcium device | |
| CN221459984U (en) | Resin wastewater pretreatment system | |
| CN212152411U (en) | Smelt and use zinc solution purifier | |
| CN217041335U (en) | Nickel sulfate continuous crystallization integrated equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |