CN115645970A - External ammonium sulfate crystallization auxiliary device and process - Google Patents

External ammonium sulfate crystallization auxiliary device and process Download PDF

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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
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external
crystallization tank
crystallization
ammonium sulfate
tank
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赵丹萍
于清野
崔月会
赵虎
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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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

一种硫铵外置结晶辅助装置及工艺A kind of ammonium sulfate external crystallization auxiliary device and process

技术领域technical field

本发明涉及焦炉煤气氨回收技术领域,尤其涉及一种硫铵外置结晶辅助装置及工艺。The invention relates to the technical field of coke oven gas ammonia recovery, in particular to an auxiliary ammonium sulfate crystallization device and a process.

背景技术Background technique

煤气净化过程中,会通过硫酸吸收煤气中的氨制得硫酸铵,是焦化厂中大量生产的重要化学产品之一。In the gas purification process, ammonia in the gas is absorbed by sulfuric acid to produce ammonium sulfate, which is one of the important chemical products produced in large quantities in coking plants.

我国大部分大型焦化厂均采用饱和器法生产硫酸铵。饱和器的设备处理量通常由煤气处理量决定。而硫酸铵的产量除了受煤气处理量影响,还取决于煤气中含氨量的多少,煤气中含氨量受前序工序及原料成分影响很大,因此即使相同规模的煤气处理量可能存在硫酸铵产量不同的情况,因此会出现饱和器下部结晶室结晶时间不够的问题。Most of the large coking plants in my country use the saturator method to produce ammonium sulfate. The equipment processing capacity of the saturator is usually determined by the gas processing capacity. The output of ammonium sulfate is not only affected by the gas treatment capacity, but also depends on the amount of ammonia in the gas. The ammonia content in the gas is greatly affected by the pre-procedure process and raw material composition. Therefore, even with the same scale of gas treatment capacity, sulfuric acid may exist. In the case of different ammonium yields, there will be a problem of insufficient crystallization time in the crystallization chamber in the lower part of the saturator.

结晶时间过短则硫铵小颗粒晶体没有足够的时间生长到需要的尺寸,从而降低产品品质。母液中结晶程度一般以晶比来表示,即母液中所含结晶的体积对母液与结晶的总体积的百分比。If the crystallization time is too short, the small ammonium sulfate crystals will not have enough time to grow to the required size, thereby reducing the product quality. The degree of crystallization in the mother liquor is generally expressed by the crystal ratio, that is, the percentage of the volume of crystals contained in the mother liquor to the total volume of the mother liquor and crystals.

晶比要适当控制,晶比过高时相对减少了氨与硫酸反应的容积,不利于氨的吸收,并使母液搅拌的阻力加大,导致母液搅拌不良,造成设备堵塞。通常在晶比达到30%时,进行提料,晶比降低到10%时则停止。而当前序生产或原料问题造成煤气中含氨量急剧增加时,在相同结晶时间下,当结晶颗粒尺寸较小时,而母液晶比却很高,从而被迫提料进行干燥,降低产品品质。而煤气中氨含量剧烈变化的原因有可能是临时性的,也可能是永久性的。The crystal ratio should be properly controlled. When the crystal ratio is too high, the reaction volume of ammonia and sulfuric acid will be relatively reduced, which is not conducive to the absorption of ammonia, and will increase the resistance of mother liquor stirring, resulting in poor stirring of mother liquor and blockage of equipment. Usually, when the crystal ratio reaches 30%, the material extraction is carried out, and when the crystal ratio is reduced to 10%, it stops. However, when the pre-production or raw material problems cause the ammonia content in the gas to increase sharply, at the same crystallization time, when the crystallization particle size is small, the ratio of mother liquid crystal is high, so the material is forced to be dried and the product quality is reduced. The reason for the drastic change of ammonia content in gas may be temporary or permanent.

对于新建硫铵单元,临时性的氨含量波动在设计之初不可预见,如果因此而盲目扩大设备规模会造成不必要的资金和能源浪费。对于旧有硫铵单元,往往因投产后工艺调整或原料变化造成永久性的硫酸铵处理量大于设备设计处理能力的问题,而以往的处理方法只能是停产改造更换饱和器,改造成本和难度均较高。。For new ammonium sulfate units, temporary fluctuations in ammonia content cannot be foreseen at the beginning of the design, and blindly expanding the scale of equipment will cause unnecessary waste of funds and energy. For the old ammonium sulfate units, often due to process adjustments or raw material changes after commissioning, the permanent ammonium sulfate processing capacity is greater than the equipment design processing capacity. The previous treatment method can only be to stop production and replace the saturator. The cost and difficulty of the transformation Both are higher. .

发明内容Contents of the invention

为了克服现有技术的不足,本发明提供了一种硫铵外置结晶辅助装置及工艺,将饱和器硫铵结晶槽无法及时处理的剩余硫铵晶体送入外置结晶槽,为晶体继续生长提供空间,延长结晶时间,增加结晶处理量的同时保证产品质量。In order to overcome the deficiencies in the prior art, the present invention provides an external ammonium sulfate crystallization auxiliary device and process, which sends the remaining ammonium sulfate crystals that cannot be processed in time in the ammonium sulfate crystallization tank of the saturator into the external crystallization tank, so that the crystals continue to grow Provide space, prolong crystallization time, increase crystallization processing capacity and ensure product quality at the same time.

为了达到上述目的,本发明采用以下技术方案实现:In order to achieve the above object, the present invention adopts the following technical solutions to realize:

一种硫铵外置结晶辅助装置,包括外置结晶槽(1)、外置结晶槽循环泵(2)、外置结晶槽液位计(3)、调节阀(4)与流量计(5);饱和器硫铵结晶槽(6)出口的硫铵浆液管道设有第一分支管道与外置结晶槽(1)入口相连,调节阀(4)与流量计(5)设置在第一分支管道上;饱和器硫铵结晶槽(6)入口的硫铵母液管道设有第二分支管道与外置结晶槽(1)入口相连;外置结晶槽液位计(3)安装在外置结晶槽(1)上;外置结晶槽循环泵(2)入口通过管道与第一管道相连,外置结晶槽循环泵(2)出口通过管道与外置结晶槽(1)相连。An external crystallization auxiliary device for ammonium sulfate, comprising an external crystallization tank (1), an external crystallization tank circulation pump (2), an external crystallization tank liquid level gauge (3), a regulating valve (4) and a flow meter (5 ); the ammonium sulfate slurry pipeline of the saturator ammonium sulfate crystallization tank (6) outlet is provided with the first branch pipeline and is connected with the external crystallization tank (1) inlet, and the regulating valve (4) and the flowmeter (5) are arranged on the first branch On the pipeline; the 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 to the entrance of the external crystallization tank (1); the external crystallization tank liquid level gauge (3) is installed in the external crystallization tank (1) above; the inlet of the external crystallization tank circulation pump (2) is connected with the first pipeline through a pipeline, and the outlet of the external crystallization tank circulation pump (2) is connected with the external crystallization tank (1) through a pipeline.

进一步地,所述外置结晶槽(1)与饱和器硫铵结晶槽(6)通过管道并联。Further, the external crystallization tank (1) is connected in parallel with the saturator ammonium sulfate crystallization tank (6) through pipelines.

进一步地,所述外置结晶槽(1)与饱和器硫铵结晶槽(6)通过管道串联。Further, the external crystallization tank (1) is connected in series with the saturator ammonium sulfate crystallization tank (6) through pipelines.

进一步地,所述外置结晶槽(1)上部与下部均通过管道与外置结晶槽循环泵(2)相连。Further, the upper and lower parts of the external crystallization tank (1) are connected to the external crystallization tank circulation pump (2) through pipelines.

进一步地,所述调节阀(4)与流量计(5)联锁,所述流量计(5)调节控制调节阀(4),满流槽液位计(7)联锁控制调节阀(4)。Further, the regulating valve (4) is interlocked with the flowmeter (5), the flowmeter (5) regulates and controls the regulating valve (4), and the full flow tank liquid level gauge (7) interlocks and controls the regulating valve (4 ).

一种硫铵外置结晶辅助工艺,具体包括:An ammonium sulfate external crystallization auxiliary process, specifically comprising:

1)若饱和器硫铵结晶槽(6)结晶颗粒却小于提料要求时,结晶泵(8)开始向外置结晶槽(1)供料,此时外置结晶槽循环泵(2)不工作;1) If the crystal particles in the ammonium sulfate crystallization tank (6) of the saturator are smaller than the feeding requirements, the crystallization pump (8) starts to supply material to the external crystallization tank (1), and at this time the external crystallization tank circulating pump (2) does not Work;

当结晶泵(8)停止向外置结晶槽(1)供料时,此时外置结晶槽循环泵(2)开始工作,循环搅拌母液;When the crystallization pump (8) stops feeding to the external crystallization tank (1), the external crystallization tank circulation pump (2) starts to work at this moment, and circulates and stirs the mother liquor;

2)当外置结晶槽液位计(3)显示液位高于外置结晶循环泵(2)抽出口且高于设定报警值时,外置结晶循环泵(2)从外置结晶槽(1)上部抽料(c),从外置结晶槽(1)底部供料(d),对外置结晶槽(1)内部进行循环搅动,防止底部堆料;2) When the liquid level gauge (3) of the external crystallization tank shows that the liquid level is higher than the outlet of the external crystallization circulation pump (2) and higher than the set alarm value, the external crystallization circulation pump (2) will start from the external crystallization tank (1) The upper part draws material (c), feeds material (d) from the bottom of the external crystallization tank (1), and circulates the inside of the external crystallization tank (1) to prevent stockpiling at the bottom;

3)当外置结晶槽液位计(3)显示液位低于设定值时,改从外置结晶槽(1)底部抽料(a),从外置结晶槽(1)顶部供料(b);3) When the liquid level gauge (3) of the external crystallization tank shows that the liquid level is lower than the set value, change to pumping material (a) from the bottom of the external crystallization tank (1), and feeding from the top of the external crystallization tank (1) (b);

4)当需要从外置结晶槽(1)提料时,则关闭饱和器(9)至结晶泵(8)的入口阀,开启外置结晶槽(1)至结晶泵(8)入口阀,通过结晶泵(8)将母液送至饱和器硫铵结晶槽(6);4) When it is necessary to extract material from the external crystallization tank (1), close the inlet valve from the saturator (9) to the crystallization pump (8), and open the inlet valve from the external crystallization tank (1) to the crystallization pump (8), Mother liquor is sent to saturator ammonium sulfate crystallization tank (6) by crystallization pump (8);

5)饱和器硫铵结晶槽(6)和外置结晶槽(1)并联操作时,两个结晶槽的满流母液一起返回饱和器(9);5) When the saturator ammonium sulfate crystallization tank (6) and the external crystallization tank (1) are operated in parallel, the full-flow mother liquor of the two crystallization tanks returns to the saturator (9) together;

串联操作时,饱和器硫铵结晶槽(6)的满流母液进入外置结晶槽(1),再满流回饱和器(9),延长结晶时间;During series operation, the full-flow mother liquor of the saturator ammonium sulfate crystallization tank (6) enters the external crystallization tank (1), and then fully flows back to the saturator (9), prolonging the crystallization time;

6)同时向饱和器硫铵结晶槽(6)和外置结晶槽(1)供料时,根据生产实际情况人为设定和控制比例关系;通过满流槽液位计(7)联锁控制调节阀(4),当满流槽液位低于设定值时切断调节阀(4),以保证满流槽的水封要求。6) When feeding materials to the ammonium sulfate crystallization tank (6) of the saturator and the external crystallization tank (1) at the same time, artificially set and control the proportional relationship according to the actual production situation; through the interlocking control of the full flow tank liquid level gauge (7) Regulating valve (4), when the liquid level of the full flow tank is lower than the set value, the regulating valve (4) is cut off to ensure the water seal requirement of the full flow tank.

与现有技术相比,本发明的有益效果是:Compared with prior art, the beneficial effect of the present invention is:

1、不影响原有工艺,仅在原有设备无法满足处理要求时启用,其余时间处于备用状态,节省能源,增加装置运行稳定性和操作弹性。1. It does not affect the original process. It is only used when the original equipment cannot meet the processing requirements, and it is in a standby state for the rest of the time, saving energy and increasing the stability and flexibility of the device.

2、可实现旧装置不停产扩容改造,无需改造原有设备,改造时间短,追加设备投资少,易于实现。2. It can realize the non-stop production and expansion of the old equipment, no need to transform the original equipment, the transformation time is short, the investment in additional equipment is small, and it is easy to realize.

3、可以与原有结晶槽实现串联或并联操作,灵活可变。3. It can be operated in series or in parallel with the original crystallization tank, which is flexible and variable.

4、配套的外置结晶槽循环泵可在不提料时对结晶槽内母液实现循环扰动,促进结晶,防止设备堵塞。4. The matching external crystallization tank circulation pump can realize the circulation disturbance of the mother liquor in the crystallization tank when the material is not lifted, promote crystallization and prevent equipment blockage.

5、根据液位情况,切换结晶泵抽料及供料位置,稳定操作。5. According to the liquid level, switch the pumping and feeding positions of the crystallization pump for stable operation.

6、设置调节阀和流量计,可根据生产情况自动控制进料流量。6. Set the regulating valve and flow meter, which can automatically control the feed flow according to the production situation.

7、调节阀和满流液位计联锁切断,保证生产的安全稳定性。7. The regulating valve and the full flow level gauge are interlocked and cut off to ensure the safety and stability of production.

8、设备占地小,可根据生产需要继续增加外置结晶槽的数量,灵活可变。8. The equipment occupies a small area, and the number of external crystallization tanks can be continuously increased according to production needs, which is flexible and variable.

附图说明Description of drawings

图1是本发明结构示意及工艺原理图。Fig. 1 is a structural representation and a process schematic diagram of the present invention.

图中:1-外置结晶槽 2-外置结晶槽循环泵 3-外置结晶槽液位计 4-调节阀 5-流量计 6-饱和器硫铵结晶槽 7-满流槽液位计 8-结晶泵 9-饱和器In the figure: 1-external crystallization tank 2-external crystallization tank circulation pump 3-external crystallization tank level gauge 4-regulating valve 5-flow meter 6-saturator ammonium sulfate crystallization tank 7-full flow tank level gauge 8-Crystal pump 9-Saturator

具体实施方式Detailed ways

本发明公开了提供一种硫铵外置结晶辅助装置及工艺。本领域技术人员可以借鉴本文内容,适当改进工艺参数实现。特别需要指出的是,所有类似的替换和改动对本领域技术人员来说是显而易见的,它们都被视为包括在本发明。本发明的方法及应用已经通过较佳实施例进行了描述,相关人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和应用进行改动或适当变更与组合,来实现和应用本发明技术。The invention discloses an external ammonium sulfate crystallization auxiliary device and a process. Those skilled in the art can refer to the content of this article to appropriately improve the process parameters to achieve. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.

下面结合附图对本发明的具体实施方式作进一步说明:The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

如图1所示,一种硫铵外置结晶辅助装置,包括外置结晶槽(1)、外置结晶槽循环泵(2)、外置结晶槽液位计(3)、调节阀(4)与流量计(5)。饱和器硫铵结晶槽(6)出口的硫铵浆液管道设有第一分支管道与外置结晶槽(1)入口相连,调节阀(4)与流量计(5)设置在第一分支管道上。饱和器硫铵结晶槽(6)入口的硫铵母液管道设有第二分支管道与外置结晶槽(1)入口相连。外置结晶槽液位计(3)安装在外置结晶槽(1)上。外置结晶槽循环泵(2)入口通过管道与第一管道相连,外置结晶槽循环泵(2)出口通过管道与外置结晶槽(1)相连。As shown in Figure 1, a kind of ammonium sulfate external crystallization auxiliary device comprises external crystallization tank (1), external crystallization tank circulation pump (2), external crystallization tank level gauge (3), regulating valve (4 ) and flow meter (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 to the entrance of the external crystallization tank (1), and the regulating valve (4) and the flow meter (5) are arranged on the first branch pipeline . The ammonium sulfate mother liquid pipeline at the inlet of the ammonium sulfate crystallization tank (6) of the saturator is provided with a second branch pipeline to be connected with the entrance of the external crystallization tank (1). The external crystallization tank liquid level gauge (3) is installed on the external crystallization tank (1). The inlet of the external crystallization tank circulation pump (2) is connected with the first pipeline through a pipeline, and the outlet of the external crystallization tank circulation pump (2) is connected with the external crystallization tank (1) through a pipeline.

进一步地,外置结晶槽(1)与饱和器硫铵结晶槽(6)通过管道并联。增加硫铵结晶设备容积,从而可根据生产实际情况灵活调整硫铵结晶时间。Further, the external crystallization tank (1) and the saturator ammonium sulfate crystallization tank (6) are connected in parallel through pipelines. Increase the volume of ammonium sulfate crystallization equipment, so that the ammonium sulfate crystallization time can be flexibly adjusted according to the actual production situation.

进一步地,外置结晶槽(1)与饱和器硫铵结晶槽(6)通过管道串联。可以实现颗粒的多级结晶。Further, the external crystallization tank (1) is connected in series with the saturator ammonium sulfate crystallization tank (6) through pipelines. Multistage crystallization of particles can be achieved.

进一步地,外置结晶槽(1)上部与下部均通过管道与外置结晶槽循环泵(2)相连。根据外置结晶槽液位计(3)所示的液位情况调整外置循环泵(2)的进料方式,选择从上部或下部进料。Further, both the upper part and the lower part of the external crystallization tank (1) are connected to the external crystallization tank circulating pump (2) through pipelines. Adjust the feeding mode of the external circulation pump (2) according to the liquid level shown by the external crystallization tank liquid level gauge (3), and select feeding from the upper part or the lower part.

进一步地,调节阀(4)与流量计(5)联锁,流量计(5)调节控制调节阀(4),满流槽液位计(7)联锁控制调节阀(4)。流量计(5)根据生产实际情况通过调节阀(4)联锁调节进入外置结晶槽(1)的物料流量;满流槽液位计(7)调节控制调节阀(4),防止满流槽无法满足水封要求,可实现系统自动、稳定运行。Further, the regulating valve (4) is interlocked with the flowmeter (5), the flowmeter (5) regulates and controls the regulating valve (4), and the full flow tank liquid level gauge (7) interlocks and controls the regulating valve (4). The flow meter (5) adjusts the material flow into the external crystallization tank (1) through the interlocking control valve (4) according to the actual production situation; the full flow tank liquid level gauge (7) adjusts and controls the control valve (4) to prevent full flow The tank cannot meet the water seal requirements, which can realize the automatic and stable operation of the system.

一种硫铵外置结晶辅助工艺,具体包括:An ammonium sulfate external crystallization auxiliary process, specifically comprising:

当饱和器(9)晶比过高,结晶颗粒却小于提料要求时,结晶泵开始向外置结晶槽(1)供料,此时外置结晶槽循环泵(2)不工作;当结晶泵停止向外置结晶槽(1)供料时,此时外置结晶槽循环泵(2)开始工作,循环搅拌母液,促进结晶,防止晶体过度堆积造成提料困难。When the crystal ratio of the saturator (9) is too high and the crystallization particles are smaller than the material-lifting requirement, the crystallization pump starts to supply material to the external crystallization tank (1), and the external crystallization tank circulation pump (2) does not work at this moment; when the crystallization When the pump stops feeding material to the external crystallization tank (1), the external crystallization tank circulating pump (2) starts to work at this time to circulate and stir the mother liquor to promote crystallization and prevent excessive accumulation of crystals causing difficulty in feeding.

同时,当外置结晶槽液位计(3)显示液位高于外置结晶循环泵(2)抽出口且高于设定报警值时,外置结晶循环泵(2)从外置结晶槽(1)上部抽料(c),从外置结晶槽(1)底部供料(d),对外置结晶槽(1)内部进行有效的循环搅动,防止底部堆料。At the same time, when the external crystallization tank liquid level gauge (3) shows that the liquid level is higher than the outlet of the external crystallization circulating pump (2) and higher than the set alarm value, the external crystallization circulating pump (2) will (1) The material is pumped (c) from the upper part, and the material (d) is supplied from the bottom of the external crystallization tank (1), and the inside of the external crystallization tank (1) is effectively circulated to prevent material piling at the bottom.

当外置结晶槽液位计(3)显示液位低于设定值时,改从外置结晶槽(1)底部抽料(a),从外置结晶槽(1)顶部供料(b)。通过液位切换外置结晶循环泵(2)工作管路,既可实现对结晶的有效搅动,又可以保证系统稳定,防止结晶槽液位过低时无法抽料。When the liquid level gauge (3) of the external crystallization tank shows that the liquid level is lower than the set value, the material is drawn from the bottom of the external crystallization tank (1) (a), and the material is supplied from the top of the external crystallization tank (1) (b ). By switching the working pipeline of the external crystallization circulation pump (2) through the liquid level, it can not only realize the effective stirring of the crystallization, but also ensure the stability of the system, and prevent the material from being unable to be pumped when the liquid level of the crystallization tank is too low.

当需要从外置结晶槽(1)提料时,则关闭饱和器至结晶泵(8)的入口阀,开启外置结晶槽(1)至结晶泵(8入口阀,通过结晶泵将母液送至原有结晶槽。When it is necessary to extract material from the external crystallization tank (1), close the inlet valve from the saturator to the crystallization pump (8), open the inlet valve from the external crystallization tank (1) to the crystallization pump (8), and send the mother liquor to to the original crystallization tank.

饱和器硫铵结晶槽(6)和外置结晶槽(1)可以实现串联或并联操作。并联操作时,两个结晶槽的满流母液一起返回饱和器;串联操作时,饱和器硫铵结晶槽(6)的满流母液进入外置结晶槽(1),再满流回饱和器(9),延长结晶时间。The saturator ammonium sulfate crystallization tank (6) and the external crystallization tank (1) can be operated in series or in parallel. During parallel operation, the full-flow mother liquor of the two crystallization tanks returns to the saturator together; during series operation, the full-flow mother liquor of the ammonium sulfate crystallization tank (6) of the saturator enters the external crystallization tank (1), and then fully flows back to the saturator ( 9), prolong the crystallization time.

本工艺设计有调节阀(4)、流量计(5),可以同时向饱和器硫铵结晶槽(6)和外置结晶槽(1)供料,并根据生产实际情况人为设定和控制比例关系。通过满流槽液位计(7)联锁控制调节阀(4),当满流槽液位低于设定值时切断调节阀(4),以保证满流槽的水封要求,保证系统自动、安全、稳定运行。This process is designed with a regulating valve (4) and a flow meter (5), which can simultaneously supply materials to the ammonium sulfate crystallization tank (6) of the saturator and the external crystallization tank (1), and artificially set and control the ratio according to the actual production situation relation. The regulating valve (4) is interlocked and controlled by the liquid level gauge (7) of the full flow tank, and the regulating valve (4) is cut off when the liquid level of the full flow tank is lower than the set value, so as to ensure the water seal requirements of the full flow tank and ensure the system Automatic, safe and stable operation.

煤气中含氨量受前序工序及原料成分影响很大,当硫铵结晶产量超过设备设计处理能力时,硫铵结晶时间缩短,会使硫铵结晶颗粒过小,降低产品品质。本发明为硫铵外置结晶辅助工艺,将原装置无法及时处理的剩余硫铵晶体送入外置结晶槽,为晶体继续生长提供空间,延长结晶时间,增加结晶处理量,保证产品质量。对于新建装置,本工艺可以作为增加操作弹性的辅助设备;对于旧有装置,可实现不停产改造。本发明具有工艺简单、完善、合理,操作容易,成本低,投资少,节省能源等显著优点。The ammonia content in gas is greatly affected by the previous process and raw material composition. When the ammonium sulfate crystallization output exceeds the equipment design processing capacity, the ammonium sulfate crystallization time will be shortened, which will make the ammonium sulfate crystallization particles too small and reduce the product quality. The invention is an auxiliary ammonium sulfate external crystallization process, which sends the remaining ammonium sulfate crystals that cannot be processed in time by the original device into an external crystallization tank, provides space for the crystals to continue to grow, prolongs the crystallization time, increases the crystallization processing capacity, and ensures product quality. For new installations, this process can be used as auxiliary equipment to increase operational flexibility; for old installations, it can be transformed without stopping production. The invention has the obvious advantages of simple, perfect and reasonable process, easy operation, low cost, less investment and energy saving.

以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection 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.
CN202211290299.XA 2022-10-21 2022-10-21 External ammonium sulfate crystallization auxiliary device and process Pending CN115645970A (en)

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