CN209872642U - Condensate purification treatment system for low gas change process of synthetic ammonia - Google Patents
Condensate purification treatment system for low gas change process of synthetic ammonia Download PDFInfo
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Abstract
本实用新型公开了一种合成氨低变气工艺冷凝液净化处理系统，低变气分离器的工艺冷凝液出口管线分别与个循环水系统和工艺冷凝液泵相连，工艺冷凝液泵出口管线与工艺冷凝液换热器冷侧进口相连，工艺冷凝液换热器的热侧出口与第一汽提塔的上部进口相连，第一汽提塔的底端工艺冷凝液出口管线与第二汽提塔上部进口相连，第二汽提塔的底端工艺冷凝液出口管线与工艺冷凝液换热器的热侧进口相连，工艺冷凝液换热器的冷侧出口与工艺冷凝液水冷器相连，工艺冷凝液水冷器的出口管线分出三个支管分别连接到循环水系统、二氧化碳吹脱塔和锅炉给水系统，二氧化碳吹脱塔的出水口与混床相连，混床的出水抽到锅炉给水系统。有效保护环境，达到节能降耗的目的。
The utility model discloses a purification treatment system for the condensate of the low-variation gas process of synthetic ammonia. The process condensate outlet pipeline of the low-variation gas separator is respectively connected with a circulating water system and a process condensate pump, and the process condensate pump outlet pipeline is connected with the process The cold side inlet of the condensate heat exchanger is connected, the hot side outlet of the process condensate heat exchanger is connected with the upper inlet of the first stripper, and the process condensate outlet pipeline at the bottom of the first stripper is connected with the second stripper The upper inlet is connected, the process condensate outlet pipeline at the bottom of the second stripping tower is connected with the hot side inlet of the process condensate heat exchanger, the cold side outlet of the process condensate heat exchanger is connected with the process condensate water cooler, and the process condensate The outlet pipeline of the liquid water cooler is divided into three branch pipes, which are respectively connected to the circulating water system, the carbon dioxide stripping tower and the boiler water supply system. Effectively protect the environment and achieve the purpose of saving energy and reducing consumption.
Description
技术领域technical field
本实用新型涉及一种合成氨低变气工艺冷凝液净化处理系统，属于化工领域。The utility model relates to a system for purifying and treating condensate in a low gas change process of synthetic ammonia, which belongs to the field of chemical industry.
背景技术Background technique
氮肥厂合成氨工艺总流程为：来自长输管线的天然气首先进入天然气配气站，天然气在配气站进行缓冲及调压后进入合成氨装置的常温脱硫系统，然后通过天然气压缩，高温脱硫，换热式一段蒸汽转化、二段富氧空气转化，一氧化碳高、低温变换，改良热钾碱法脱碳，甲烷化深度净化除去残余的CO和CO2，合成气压缩，14.0MPa下氨合成，冷冻分离，最终得到产品液氨。The general process of ammonia synthesis process in nitrogen fertilizer plant is as follows: the natural gas from the long-distance pipeline first enters the natural gas distribution station, after the natural gas is buffered and pressure-regulated at the distribution station, it enters the normal temperature desulfurization system of the ammonia synthesis unit, and then is compressed by natural gas, high-temperature desulfurization, and heat exchange One-stage steam reforming, two-stage oxygen-enriched air reforming, carbon monoxide high and low temperature shifting, improved hot potassium alkali decarburization, deep purification of methanation to remove residual CO and CO 2 , synthesis gas compression, ammonia synthesis at 14.0MPa, freezing separation , and finally the product liquid ammonia is obtained.
低温变换后的低变气经过冷却后进入低变气分离器，低变气里面含有的大量工艺冷凝液在低变气分离器里面被分离出来，分离下来的工艺冷凝液就地排放，由于工艺冷凝液中含有CO2气体、甲醇、甲胺、甲醛、甲酸和氨等物质，直接排放至地沟里面污染环境。The low-change gas after low-temperature shift is cooled and enters the low-change gas separator. A large amount of process condensate contained in the low-change gas is separated in the low-change gas separator, and the separated process condensate is discharged on the spot. Due to the process The condensate contains CO 2 gas, methanol, methylamine, formaldehyde, formic acid and ammonia, and is directly discharged into the ditch to pollute the environment.
实用新型内容Utility model content
针对上述技术问题，本实用新型的目的在于提供一种合成氨低变气工艺冷凝液净化处理系统，对工艺冷凝液进行回收利用，减少环境污染。In view of the above-mentioned technical problems, the purpose of this utility model is to provide a system for purifying and treating the condensate of the synthetic ammonia low gas change process, which can recycle the process condensate and reduce environmental pollution.
为了实现上述目的，本实用新型的技术方案为：一种合成氨低变气工艺冷凝液净化处理系统，包括低变气分离器，其特征在于：所述低变气分离器的工艺冷凝液出口管线分出支管分别与循环水系统和工艺冷凝液泵相连，所述工艺冷凝液泵出口管线与工艺冷凝液换热器冷侧进口相连，所述工艺冷凝液换热器的热侧出口与第一汽提塔的上部进口相连，所述第一汽提塔的底端工艺冷凝液出口管线与第二汽提塔上部进口相连，所述第一汽提塔和第二汽提塔的顶端均设置有蒸汽排放管线，所述第一汽提塔和第二汽提塔的底部均设置有过热蒸汽进口管线，所述第二汽提塔的底端工艺冷凝液出口管线与工艺冷凝液换热器的热侧进口相连，所述工艺冷凝液换热器的冷侧出口与工艺冷凝液水冷器相连，所述工艺冷凝液水冷器的出口管线分出三个支管分别连接到循环水系统、二氧化碳吹脱塔和锅炉给水系统，所述二氧化碳吹脱塔的出水口与混床相连，所述混床的出水口与脱盐水池相连，所述脱盐水池的脱盐水通过脱盐水泵抽到锅炉给水系统。In order to achieve the above object, the technical solution of the present utility model is: a system for purifying and treating the condensate of the low gas change process of synthetic ammonia, including a low gas change separator, characterized in that: the process condensate outlet pipeline of the low gas change separator The branch pipes are respectively connected to the circulating water system and the process condensate pump, the outlet pipeline of the process condensate pump is connected to the cold side inlet of the process condensate heat exchanger, and the hot side outlet of the process condensate heat exchanger is connected to the first The upper inlet of the stripper is connected, and the bottom process condensate outlet pipeline of the first stripper is connected with the upper inlet of the second stripper, and the tops of the first stripper and the second stripper are all provided with There is a steam discharge pipeline, the bottom of the first stripper and the second stripper are provided with a superheated steam inlet pipeline, the process condensate outlet pipeline at the bottom of the second stripper and the process condensate heat exchanger The hot side inlet of the process condensate heat exchanger is connected, the cold side outlet of the process condensate heat exchanger is connected with the process condensate water cooler, and the outlet pipeline of the process condensate water cooler is divided into three branch pipes connected to the circulating water system, carbon dioxide blowing Stripping tower and boiler feed water system, the water outlet of the carbon dioxide stripping tower is connected to the mixed bed, the water outlet of the mixed bed is connected to the desalted water tank, and the desalted water in the desalted water tank is pumped to the boiler feed water system through the desalted water pump.
采用上述方案，低变气里面的工艺冷凝液经过冷凝后，通过工艺冷凝液泵抽到工艺冷凝液换热器，进行换热，温度从70℃加热到230℃左右后从第一汽提塔的上部进入，来自加热炉的过热蒸汽(4.2MPa)被加热到350℃后从汽提塔的下部进入，过热蒸汽在塔内与工艺冷凝液进行逆流接触，工艺冷凝液内含有的CO2气体、甲醇、甲胺、甲醛、甲酸和氨等物质被过热蒸汽汽提后从汽提塔顶部出来。从两台汽提塔顶部出来的混合气体最终被送到转化工序作为工艺蒸汽使用。两台汽提塔进行串联使用，当装置在超产运行的情况下，保证工艺冷凝液能被汽提塔进行汽提处理合格(在超产运行时，工艺冷凝液量大，一台汽提塔无法保证工艺冷凝液的处理能力)，从而满足生产的需要。Using the above scheme, after the process condensate in the low-change gas is condensed, it is pumped to the process condensate heat exchanger through the process condensate pump for heat exchange. The superheated steam (4.2MPa) from the heating furnace is heated to 350°C and then enters from the lower part of the stripping tower. The superheated steam is in countercurrent contact with the process condensate in the tower, and the CO 2 gas contained in the process condensate Substances such as methanol, methylamine, formaldehyde, formic acid and ammonia are stripped by superheated steam and come out from the top of the stripping tower. The mixed gas from the top of the two strippers is finally sent to the reforming process as process steam. Two stripping towers are used in series. When the device is operating at overproduction, it is guaranteed that the process condensate can be stripped by the stripping tower to pass the stripping treatment. To ensure the processing capacity of the process condensate), so as to meet the needs of production.
经过两级过热蒸汽汽提后，工艺冷凝液中的CO2气体、甲醇、甲胺、甲醛、甲酸和氨等物质基本上被完全除去。从汽提塔底部出来的工艺冷凝液温度在250℃左右，然后进入工艺冷凝液换热器换热，换热后的工艺冷凝液进入工艺冷凝液水冷器继续进行冷却，工艺冷凝液的温度被降低到50℃左右后。如果还存在微量的有机物、CO2、盐和金属等杂质没有完全去除掉，再经过CO2吹出塔和混床处理，从而保证锅炉水质的质量，确保了锅炉的生产安全。After two-stage superheated steam stripping, substances such as CO2 gas, methanol, methylamine, formaldehyde, formic acid and ammonia in the process condensate are basically completely removed. The temperature of the process condensate from the bottom of the stripping tower is about 250°C, and then enters the process condensate heat exchanger for heat exchange. After heat exchange, the process condensate enters the process condensate water cooler to continue cooling, and the temperature of the process condensate is reduced. After lowering to about 50°C. If there are still traces of impurities such as organic matter, CO 2 , salt and metals that have not been completely removed, they will be treated through CO 2 blowing tower and mixed bed to ensure the quality of boiler water and ensure the safety of boiler production.
当经过汽提塔处理后的工艺冷凝液经过分析合格后，可以直接输送到锅炉水给水系统作为锅炉水使用，这样工艺冷凝液就不需要再被送至脱盐水水池，再经过脱盐水泵后送入锅炉水给水系统这个流程，同时也节约了脱盐水泵的用电量。When the process condensate treated by the stripping tower is qualified after analysis, it can be directly sent to the boiler water supply system to be used as boiler water, so that the process condensate does not need to be sent to the desalted water tank, and then sent to the desalted water pump The process of entering the boiler water supply system also saves the power consumption of the desalinated water pump.
从工艺冷凝液水冷器出来的工艺冷凝液如果分析不合格可以去循环水系统，避免排放，同时也节约循环水的一次补水量。If the process condensate from the process condensate water cooler fails to pass the analysis, it can go to the circulating water system to avoid discharge, and also save the primary water supply of circulating water.
上述方案中：所述工艺冷凝液泵为两台，两台工艺冷凝液泵分别与低变气分离器的工艺冷凝液出口管线的支管相连，两台工艺冷凝液泵一开一备。In the above scheme: there are two process condensate pumps, and the two process condensate pumps are respectively connected to the branch pipes of the process condensate outlet pipeline of the low-variation gas separator, and the two process condensate pumps are one on and one on standby.
有益效果：本实用新型的合成氨低变气工艺冷凝液净化处理系统能保证对工艺冷凝液的净化处理需求，并且最终将工艺冷凝液作为锅炉用水或循环水予以回收使用，有效保护环境，达到节能降耗的目的。Beneficial effects: the purification and treatment system for the condensate of the synthetic ammonia low-change gas process of the utility model can ensure the purification treatment requirements of the process condensate, and finally recycle the process condensate as boiler water or circulating water, effectively protect the environment and achieve energy saving purpose of reducing consumption.
附图说明Description of drawings
图1是本实用新型的流程示意图。Fig. 1 is a schematic flow chart of the utility model.
具体实施方式Detailed ways
下面通过实施例并结合附图，对本实用新型作进一步说明：Below by embodiment and in conjunction with accompanying drawing, the utility model is further described:
实施例1，如图1所示，合成氨低变气工艺冷凝液净化处理系统由低变气分离器1、工艺冷凝液泵2、第一汽提塔3、第二汽提塔4、工艺冷凝液换热器5、工艺冷凝液水冷器6、二氧化碳吹脱塔7、混床8、脱盐水池9、脱盐水泵10及连接管道和阀门组成。Embodiment 1, as shown in Figure 1, the condensate purification treatment system of synthetic ammonia low gas change process consists of low gas change separator 1, process condensate pump 2, first stripper 3, second stripper 4, process condensate Liquid heat exchanger 5, process condensate water cooler 6, carbon dioxide stripping tower 7, mixed bed 8, desalted water pool 9, desalted water pump 10, connecting pipes and valves.
低变气分离器1的工艺冷凝液出口管线分出三个支管分别与循环水系统和两台工艺冷凝液泵2相连，各支管上分别设置有阀门。两台工艺冷凝液泵2一开一备。两台工艺冷凝液泵2出口管线均与工艺冷凝液换热器5冷侧进口相连，工艺冷凝液换热器5的热侧出口与第一汽提塔3的上部进口相连，第一汽提塔3的底端工艺冷凝液出口管线与第二汽提塔4上部进口相连，第一汽提塔3和第二汽提塔4的顶端均设置有蒸汽排放管线，蒸汽排放管线去蒸汽转化系统。第一汽提塔3和第二汽提塔4的底部均设置有过热蒸汽进口管线，第二汽提塔4的底端工艺冷凝液出口管线与工艺冷凝液换热器5的热侧进口相连，工艺冷凝液换热器5的冷侧出口与工艺冷凝液水冷器6相连，工艺冷凝液水冷器6的出口管线分出三个支管分别连接到循环水系统、二氧化碳吹脱塔7和锅炉给水系统，三个支管上分别设置有阀门，二氧化碳吹脱塔7的出水口与混床8相连，混床8的出水口与脱盐水池9相连，脱盐水池9的脱盐水通过脱盐水泵10抽到锅炉给水系统。The process condensate outlet pipeline of the low-variation gas separator 1 is divided into three branch pipes which are respectively connected to the circulating water system and two process condensate pumps 2, and each branch pipe is respectively provided with a valve. Two process condensate pumps 2, one on and one on standby. The outlet pipelines of the two process condensate pumps 2 are connected to the cold side inlet of the process condensate heat exchanger 5, and the hot side outlet of the process condensate heat exchanger 5 is connected to the upper inlet of the first stripping tower 3, and the first stripper The process condensate outlet pipeline at the bottom of the tower 3 is connected to the upper inlet of the second stripper 4, and the tops of the first stripper 3 and the second stripper 4 are provided with steam discharge pipelines, and the steam discharge pipelines go to the steam reforming system . The bottoms of the first stripper 3 and the second stripper 4 are all provided with a superheated steam inlet pipeline, and the bottom process condensate outlet pipeline of the second stripper 4 is connected with the hot side inlet of the process condensate heat exchanger 5 , the cold side outlet of the process condensate heat exchanger 5 is connected to the process condensate water cooler 6, and the outlet pipeline of the process condensate water cooler 6 is divided into three branch pipes, which are respectively connected to the circulating water system, the carbon dioxide stripping tower 7 and the boiler feed water system, three branch pipes are respectively provided with valves, the water outlet of the carbon dioxide stripping tower 7 is connected to the mixed bed 8, the water outlet of the mixed bed 8 is connected to the desalted water tank 9, and the desalted water in the desalted water tank 9 is pumped to the boiler through the desalted water pump 10 Water supply system.
本实用新型不局限于上述实施例，本领域的普通技术人员可以理解：在不脱离本实用新型的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本实用新型的范围由权利要求及其等同物限定。The utility model is not limited to the above-mentioned embodiments, and those skilled in the art can understand that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principle and purpose of the utility model. The novel scope is defined by the claims and their equivalents.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111803991A (en) * | 2020-08-07 | 2020-10-23 | 中化重庆涪陵化工有限公司 | A system for comprehensive recovery and utilization of process condensate energy |
| CN115259259A (en) * | 2022-07-18 | 2022-11-01 | 陕西未来能源化工有限公司 | Conversion condensate treatment system and process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111803991A (en) * | 2020-08-07 | 2020-10-23 | 中化重庆涪陵化工有限公司 | A system for comprehensive recovery and utilization of process condensate energy |
| CN111803991B (en) * | 2020-08-07 | 2025-04-08 | 中化重庆涪陵化工有限公司 | Comprehensive recovery and utilization system for energy of process condensate |
| CN115259259A (en) * | 2022-07-18 | 2022-11-01 | 陕西未来能源化工有限公司 | Conversion condensate treatment system and process |
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