阅读说明：本技术 焦化粗氨水净化方法 (Coking crude ammonia water purification method ) 是由 罗小华 王永树 黄飞平 吴志福 邹骏 杨名红 舒青平 苏克林 张吉林 马吉科 农 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种焦化粗氨水净化方法,包括使用一种焦化粗氨水净化装置对粗氨水进行净化；所述焦化粗氨水净化装置包括带有连接前端弗萨姆法生产装置产品粗氨水出口的粗氨水槽,所述粗氨水槽通过氨水输送泵连接过滤器,所述过滤器的净氨水出口管连接净氨水槽,所述净氨水槽通过净氨水泵连接用户接口；净化步骤包括：弗萨姆法所生产的粗氨水被生产系统的余压连续输送至所述粗氨水槽,经所述粗氨水输送泵连续输送经过所述过滤器,经过滤净化后的净氨水进入所述净氨水槽,最后经所述净氨水泵连续输送给用户。本发明可以有效提高无精馏弗萨姆工艺所产粗氨水品质,且不产生二次污染。(The invention discloses a coking crude ammonia water purification method, which comprises the steps of purifying crude ammonia water by using a coking crude ammonia water purification device; the coking crude ammonia water purification device comprises a crude ammonia water tank connected with a crude ammonia water outlet of a front-end Freman method production device product, the crude ammonia water tank is connected with a filter through an ammonia water delivery pump, a purified ammonia water outlet pipe of the filter is connected with a purified ammonia water tank, and the purified ammonia water tank is connected with a user interface through a purified ammonia water pump; the purification step comprises: the crude ammonia water produced by the Frsamm method is continuously conveyed to the crude ammonia water tank by the residual pressure of a production system, and is continuously conveyed by the crude ammonia water conveying pump, passes through the filter, and the filtered and purified ammonia water enters the purified ammonia water tank and is finally continuously conveyed to a user by the purified ammonia water pump. The invention can effectively improve the quality of the crude ammonia water produced by the rectification-free Framam process, and does not produce secondary pollution.)

1. A coking crude ammonia water purification method is characterized in that: comprises purifying the crude ammonia water by a coking crude ammonia water purification device;

the coking crude ammonia water purification device comprises a crude ammonia water tank connected with a crude ammonia water outlet of a front-end Freman method production device product, the crude ammonia water tank is connected with a filter through an ammonia water delivery pump, a purified ammonia water outlet pipe of the filter is connected with a purified ammonia water tank, and the purified ammonia water tank is connected with a user interface through a purified ammonia water pump;

the purification step comprises: the crude ammonia water produced by the Frsamm method is continuously conveyed to the crude ammonia water tank by the residual pressure of a production system, is continuously conveyed by the crude ammonia water conveying pump to pass through the filter, and the filtered and purified ammonia water enters the purified ammonia water tank and is finally continuously conveyed to a user by the purified ammonia water pump;

wherein the flow speed is reduced to 0.75-1 m/h in the coarse ammonia water tank, and the flow speed is controlled to 4.5-9 m/h by the coarse ammonia water delivery pump.

2. The purification method of coked crude aqueous ammonia according to claim 1, characterized in that: the filter comprises a primary filter and a secondary filter which are connected in series, and the primary filter and the secondary filter both comprise at least two connected filters.

3. The purification method of coked crude aqueous ammonia according to claim 2, characterized in that: the purified ammonia water outlet pipe is arranged on the secondary filter; the back flushing pipe is respectively connected with the primary filter and the secondary filter.

4. A coking crude ammonia water purification process according to claim 3, characterized in that: the back-washing outlet pipe is arranged on the primary filter.

5. The purification method of coked crude aqueous ammonia according to claim 4, characterized in that: the purification step further comprises: and impurities filtered by the primary filter and the secondary filter are intermittently back-flushed by the purified ammonia water at the outlet of the purified ammonia water pump, the obtained waste liquid enters the back-flushing waste liquid tank, and the back-flushing waste liquid is intermittently conveyed back to a pregnant solution system of a front end Frsum method production device for redistillation by the back-flushing waste liquid pump.

6. The coked crude ammonia water purification apparatus according to any one of claims 1 to 5, characterized in that: the crude ammonia water tank, the ammonia purification water tank and the back flushing waste liquid tank are all connected with an ammonia gas cleaning tank; the purification step further comprises: and the ammonia gas in the crude ammonia water tank, the purified ammonia water tank and the headspace of the backflushing waste liquid tank is returned to the ammonia gas cleaning tank through a pipeline and is absorbed by a diammonium phosphate solution.

Technical Field

The invention relates to the technical field of steel manufacturing equipment, in particular to a method for purifying crude ammonia water of coke oven gas by a Frsum method.

Background

The process and the device for recovering ammonia from the coke oven gas by the Frsamm method are used for producing anhydrous ammonia in a three-tower mode, but the process has large energy consumption of medium-high pressure steam, high requirements on the storage and transportation safety of the anhydrous ammonia, high investment and limited domestic popularization and application for a long time. In recent years, the two-tower non-standard Frama method coke oven gas ammonia recovery process for producing the crude ammonia water by a rectification section is cancelled, and the process is greatly popularized in the coking industry. Although the nonstandard non-rectification process overcomes the defects of the standard Frsamm process, the produced crude ammonia water has deep quality and high chroma and high suspended matter content, so that a user production device using the crude ammonia water as a raw material is easy to cause the problems of pipeline and equipment blockage, working medium pollution and the like, and the quality of the crude ammonia water needs to be improved so as to enlarge the outlet of the crude ammonia water.

Disclosure of Invention

The invention aims to solve the problem that coking crude ammonia water is high in impurity content, blocks pipeline equipment and pollutes the environment in the existing Frsamm coke oven coal crude ammonia water.

In order to solve the problems, the technical scheme of the invention is as follows: the coking crude ammonia water purification method comprises the steps of evolving crude ammonia water by using a coking crude ammonia water purification device; the coking crude ammonia water purification device comprises a crude ammonia water tank connected with a crude ammonia water outlet of a front-end Freman method production device product, the crude ammonia water tank is connected with a filter through an ammonia water delivery pump, a purified ammonia water outlet pipe of the filter is connected with a purified ammonia water tank, and the purified ammonia water tank is connected with a user interface through a purified ammonia water pump; the purification step comprises: the crude ammonia water produced by the Frsamm method is continuously conveyed to the crude ammonia water tank by the residual pressure of a production system, is continuously conveyed by the crude ammonia water conveying pump to pass through the filter, and the filtered and purified ammonia water enters the purified ammonia water tank and is finally continuously conveyed to a user by the purified ammonia water pump; wherein the flow speed is reduced to 0.75-1 m/h in the coarse ammonia water tank, and the flow speed is controlled to 4.5-9 m/h by the coarse ammonia water delivery pump.

In the above technical solution, a more specific solution may be: the filter comprises a primary filter and a secondary filter which are connected in series.

Further: the purified ammonia water outlet pipe is arranged on the secondary filter; the backwashing pipe is respectively connected with the primary filter and the secondary filter, and the primary filter and the secondary filter respectively comprise at least two connected filters.

Further: the back-washing outlet pipe is arranged on the primary filter.

Further: the step of evolving further comprises: and impurities filtered by the primary filter and the secondary filter are intermittently back-flushed by the purified ammonia water at the outlet of the purified ammonia water pump, and the obtained waste liquid enters the back-flushing waste liquid tank and is intermittently conveyed back to a rich liquid system of the front end Frsamum method production device for redistillation by the back-flushing waste liquid pump.

Further: the crude ammonia water tank, the ammonia purification water tank and the back flushing waste liquid tank are all connected with an ammonia gas cleaning tank; the purification step further comprises: and the ammonia gas in the crude ammonia water tank, the purified ammonia water tank and the headspace of the backflushing waste liquid tank is returned to the ammonia gas cleaning tank through a pipeline and is absorbed by a diammonium phosphate solution.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

according to the coking crude ammonia water purification method, crude ammonia water is firstly depressurized, and then the flow rate is stabilized through constant flow, so that adverse factors for damaging a filter bed layer are eliminated, and the product quality stability is good; impurities separated from the crude ammonia water do not enter a crude ammonia water system, the impurities have no accumulation effect in the process, and the separation effect of the process can be kept stable for a long time; volatile ammonia gas of each liquid phase storage device is collected in a centralized manner, and is treated by using related process raw materials, so that the efficiency is high, and no secondary pollution is caused; the process principle is simple, the system operates under the conditions of normal temperature and low pressure, and the operation safety is excellent; the process control is simple, the automation degree is high, and the labor intensity of personnel is low; the process has less energy consumption and low operation cost, and effectively solves the problem that the quality of the crude ammonia water is insufficient to influence the production stability of users.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

wherein: 1. a crude ammonia tank; 2. an ammonia water delivery pump, 3, a first-stage filter; 4. a secondary filter; 5. a purified ammonia water tank; 6. a purified ammonia pump; 7. back flushing the waste liquid tank; 8. back flushing a waste liquid pump; 9. an ammonia gas cleaning tank; 10. a backwash pipe; 11. a purified ammonia water outlet pipe; 12. and back flushing the outlet pipe.

Detailed Description

The embodiments of the invention will be described in further detail with reference to the accompanying drawings:

this coking coarse ammonia water purifies carries out the evolution including using a coking coarse ammonia water purification installation to the coarse ammonia water of the rich liquid system of the device of the method of the fluorine method, like the coking coarse ammonia water purification installation that fig. 1 shows, including having the coarse ammonia water tank 1 that connects the export of the coarse ammonia water of front end production device product of the fluorine method, coarse ammonia water tank 1 passes through ammonia water delivery pump 2 and connects the filter, the filter includes the one-level filter 3 and the secondary filter 4 of establishing ties each other, one-level filter 3 includes 1#, 2# … n #, secondary filter 4 includes 1#, 2# … m #. The purified ammonia water outlet pipe 11 of the filter is connected with a purified ammonia water tank 5, and the purified ammonia water tank 5 is connected with a user outlet through a purified ammonia water pump 6.

The water outlet pipe of the ammonia purification pump 6 is connected with the filter through a backwashing pipe 10, the backwashing outlet pipe 12 of the filter is connected with a backwashing waste liquid tank 7, and the backwashing waste liquid tank 7 is connected with a rich liquid system of a Frsamum method device at the front end through a backwashing waste liquid pump 8. The outlet of the secondary filter 4 is connected with a purified ammonia water tank 5; the backwashing pipe 10 is respectively connected with the primary filter 3 and the secondary filter 4, and the backwashing outlet pipe 12 is arranged on the primary filter 3 and is connected with the backwashing waste liquid tank 7 through the backwashing outlet pipe 12. The crude ammonia water tank 1, the purified ammonia water tank 5 and the backflushing waste liquid tank 7 are all connected with an ammonia gas cleaning tank 9.

The evolution step comprises: the crude ammonia water produced by the Frsamm method is continuously conveyed to a crude ammonia water tank 1 by the residual pressure of a production system, is continuously conveyed by a crude ammonia water conveying pump 2 to pass through a primary filter 3 and a secondary filter 4, and the purified ammonia water after filtration and purification enters a purified ammonia water tank 5 and is finally continuously conveyed to a user by a purified ammonia water pump 6. The crude ammonia water produced by the Fraxm method is reduced in flow rate in a crude ammonia water tank 1 to 0.75-1 m/h, is controlled to 4.5-9 m/h by a crude ammonia water delivery pump, and flows through a bed layer formed in a free stacking mode in a primary filter 3 and a secondary filter 4, so that the stability of the filter bed layer is not damaged, and the continuous and stable quality of purified ammonia water at the outlet of the secondary filter 4 is ensured.

Impurities filtered by the first-stage filter 3 and the second-stage filter 4 are intermittently back-flushed by the purified ammonia water at the outlet of the purified ammonia water pump 6, and the obtained waste liquid enters a back-flushing waste liquid tank 7 and is intermittently conveyed back to a rich liquid system of a front end Frsamum method production device for redistillation through a back-flushing waste liquid pump 8. The first-stage filter 3 and the second-stage filter 4 are used and standby and are washed by back flushing in turn; the primary filter and the secondary filter each comprise at least two connected filters. The number of each stage of filter can be increased or decreased according to the productivity so as to ensure that the quality of the outlet clean ammonia water is stable and matched with the productivity. The primary filter 3 and the secondary filter 4 continuously operate to purify the crude ammonia water, the impurities separated by filtration are intermittently back-washed by the purified ammonia water, and the yield of the purified ammonia water is more than or equal to 98 percent. The primary filter 3 and the secondary filter 4 can be switched between an on-use system and a standby system on line in a seamless way, and the purified ammonia water production system is continuous and stable.

The ammonia gas in the top spaces of the crude ammonia water tank 1, the purified ammonia water tank 5 and the backflushing waste liquid tank 7 is returned to the ammonia gas cleaning tank 9 through pipelines to be absorbed by diammonium phosphate solution and not to escape into the environment. The ammonia water pipeline inlets of the crude ammonia water tank 1, the purified ammonia water tank 5 and the backflushing waste liquid tank 8 are kept below the liquid level of the ammonia water, so that the ammonia water is prevented from being suddenly depressurized, atomized and volatilized.

According to the coking crude ammonia water purification method, crude ammonia water is firstly depressurized, and then the flow rate is stabilized through constant flow, so that adverse factors for damaging a filter bed layer are eliminated, and the product quality stability is good; impurities separated from the crude ammonia water do not enter a crude ammonia water system, the impurities have no accumulation effect in the process, and the separation effect of the process can be kept stable for a long time; volatile ammonia gas of each liquid phase storage device is collected in a centralized manner, and is treated by using related process raw materials, so that the efficiency is high, and no secondary pollution is caused; the process principle is simple, the system operates under the conditions of normal temperature and low pressure, and the operation safety is excellent; the process control is simple, the automation degree is high, and the labor intensity of personnel is low; the process has less energy consumption and low operation cost, and effectively solves the problem that the quality of the crude ammonia water is insufficient to influence the production stability of users. By using the device and the method, the crude ammonia water produced by the Frsum method can be used for obtaining the pure ammonia water through the operation of the bed layer filtering unit, and the quality of the pure ammonia water reaches the level that the chromaticity is less than or equal to 300, the light transmittance is more than or equal to 80 percent, and the suspended matter is less than or equal to 10 mg/l.