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System and method for pretreatment of high ammonia nitrogen acid condensate in conversion unit

A high-ammonia-nitrogen acidity, conversion unit technology, applied in the field of conversion unit high-ammonia-nitrogen acid condensate pretreatment system, can solve the problems of increasing the complexity of the process, clogging of ammonium salt crystals, increasing costs, etc., to avoid corrosion and reduce burdens , the effect of avoiding clogging

Active Publication Date: 2021-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The patent (ZL 200910098944.6) discloses a stripping method of process condensate in CO conversion. In order to solve the problem of ammonium salt crystallization blockage in the conversion process condensate stripping system, two stripping towers are used to separate CO 2 and NH 3 stripping, avoiding CO 2 and NH 3 The possibility of simultaneous existence in the system prolongs the period of stable operation of the conversion device, but it does not fundamentally solve the problems of pipeline and equipment blockage and corrosion
[0009] However, the solutions of the above patents all solve the problem by adding a stripping tower. The two-tower process not only increases the complexity and uncontrollability of the process, but also greatly increases the cost and occupies the site.

Method used

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  • System and method for pretreatment of high ammonia nitrogen acid condensate in conversion unit
  • System and method for pretreatment of high ammonia nitrogen acid condensate in conversion unit
  • System and method for pretreatment of high ammonia nitrogen acid condensate in conversion unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The shifted gas condensate enters the stripper from the top of the stripper 1, and the acid gas in the condensate is stripped out, and the stripping gas passes through the top of the stripper 1 and exits from the top of the stripper 1 after defoaming. Entering the pipeline connected to the heat exchanger 2, the temperature of the stripping gas at the top outlet of the stripping tower 1 is 148°C.

[0045] The stripping gas passes through the tube side of the heat exchanger 2, is cooled by the desalted water entering the shell side, and enters the separation tower together with the stripping gas passing through the bypass, and the temperature of the stripping liquid at the inlet of the separation tower is controlled at 135°C; The boiler replenishment is carried out through the shell-side desalted water inlet pipeline;

[0046] The cooled stripping liquid enters the separation tower, where the gas and liquid are separated, and the gas phase is adjusted to a gas phase press...

Embodiment 2

[0048] The shifted gas condensate enters the stripping tower from the upper part of the stripping tower, and the acid gas in the condensate is stripped out. The stripping gas passes through the top of the stripping tower after defoaming and exits from the top of the stripping tower. The pipeline connected to the heater, the temperature of the stripping gas at the top outlet of the stripping tower is 146°C.

[0049] The stripping gas passes through the tube side of the heat exchanger 2, is cooled by the desalted water entering the shell side, and enters the separation tower together with the stripping gas passing through the bypass, and the temperature of the stripping liquid at the inlet of the separation tower is controlled at 138°C; The boiler replenishment is carried out through the shell-side desalted water inlet pipeline;

[0050] The cooled stripping liquid enters the separation tower, where the gas and liquid are separated, and the gas phase is adjusted to a pressure of...

Embodiment 3

[0052] The shifted gas condensate enters the stripping tower from the upper part of the stripping tower, and the acid gas in the condensate is stripped out. The stripping gas passes through the top of the stripping tower after defoaming and exits from the top of the stripping tower. The pipeline connected to the heater, the temperature of the stripping gas at the top outlet of the stripping tower is 140°C.

[0053] The stripping gas passes through the tube side of the heat exchanger 2, is cooled by the desalted water entering the shell side, and enters the separation tower together with the stripping gas passing through the bypass, and the temperature of the stripping liquid at the inlet of the separation tower is controlled at 105°C; The boiler replenishment is carried out through the shell-side desalted water inlet pipeline;

[0054] The cooled stripping liquid enters the separation tower, where the gas and liquid are separated, and the gas phase is adjusted to a pressure of...

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Abstract

The invention belongs to the field of coal chemical wastewater and waste gas treatment, and in particular relates to a pretreatment system and method for high ammonia nitrogen acidic condensate of a conversion unit. The present invention replaces the circulating water heat exchanger of the coal gasification conversion unit with a desalinated water heat exchanger, uses the desalted water as the heat medium to recover heat, reduces the load of the circulating water field, and raises the temperature of the stripping liquid at the entrance of the separation tower to 100°C to 138°C. ℃, the acidic condensate (containing high ammonia nitrogen) sewage waste water is pretreated in the separation tower using a similar steam stripping method, so that the dissolved gases (high ammonia nitrogen substances, etc.) in the liquid phase are vaporized and separated as much as possible. The results show that: the total amount of high-ammonia-nitrogen substances, organic matter and sulfur-containing compounds in the gas phase increases significantly, while the liquid phase finally enters the biochemical unit with a low total amount of less than 50kg / h, which reaches the processing load of the biochemical unit, thus ensuring economical efficiency. Up-to-standard discharge after biochemical treatment.

Description

Technical field: [0001] The invention belongs to the field of coal chemical wastewater and waste gas treatment, and in particular relates to a pretreatment system and method for high ammonia nitrogen acidic condensate of a conversion unit. [0002] technical background: [0003] Ammonia nitrogen wastewater has great harm to the natural environment and human body. The main hazards of ammonia nitrogen pollution are: disturbing the normal balance of dissolved oxygen in the water body and further deteriorating the water quality; affecting the water quality of the water source and increasing the burden of water treatment; accelerating the eutrophication process of the water body. [0004] The treatment of high ammonia nitrogen wastewater is an urgent problem for enterprises to solve. According to the concentration difference, ammonia nitrogen wastewater is divided into 3 categories: (1) High concentration ammonia nitrogen wastewater: NH 3 -N>500mg / L; (2) Medium concentration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/38B01D19/00
CPCB01D3/38B01D19/0015Y02P70/10
Inventor 冯正坤文加强杨伟怀文焕周永松宋星星吕小敏潘亚虎
Owner CHINA PETROLEUM & CHEM CORP
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