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Purification technology for ammonia recycled from wastewater from coal gasification

A coal gasification wastewater and purification process technology, applied in the preparation/separation of ammonia, water pollutants, chemical instruments and methods, etc., can solve the problems of ammonia impurities and cannot be reused, so as to avoid environmental pollution and improve utilization rate , the effect of improving the purity

Active Publication Date: 2015-02-18
SEDIN ENG +1
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  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a purification process for recovering ammonia from coal gasification wastewater with high efficiency, energy saving, good purification effect and high purity of ammonia, aiming at the problem that the ammonia recovered from coal gasification wastewater contains too many impurities and cannot be reused

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  • Purification technology for ammonia recycled from wastewater from coal gasification

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Embodiment 1

[0029]The ammonia purification device of the present embodiment consists of a purification tower 1, a rectification tower 2, a condensation absorber 3, an ammonia water tank 4, a dilute ammonia water tank 5, a circulating cooler 6, an ammonia water preheater 7, an ammonia condenser 8, and a liquid ammonia storage tank. Tank 9, liquid ammonia tank 10, rectification tower reboiler 11, purification tower reflux pump 12, rectification tower feed pump 13, ammonia circulation pump 14, rectification tower reflux pump 15, liquid ammonia pump 16, which are connected The method is: the crude ammonia feed pipeline is connected to the lower part of the purification tower 1, the outlet at the bottom of the purification tower is connected to the circulation feed port in the middle of the two packing sections of the purification tower through the ammonia water circulation pump 14 and the circulation cooler 6, and the outlet at the top of the purification tower is The ammonia gas outlet is res...

Embodiment 2

[0035] The composition, connection mode and process route of the ammonia purification device in this embodiment are detailed in Example 1

[0036] The ammonia purification process route and process conditions that the present embodiment adopts are:

[0037] (1) The composition of 60°C and 0.30MPa from the stripping deamination tower of the coal gasification wastewater treatment plant is NH 3 87wt%, H 2 O 10wt%, H 2 S 0.8wt%, CO 2 2.15 wt% and oil CO 2 0.05wt%, phenol 6000mg / m 3 Crude ammonia gas enters the purification tower 1 from the bottom, and is heated to 70°C by the low-pressure steam at the bottom of the purification tower 1. The ammonia vapor first passes through the lower packing section in the purification tower and the dilute ammonia water reflux liquid with a mass concentration of 30wt% at the bottom of the purification tower 1 is reversed. Contact washing, then countercurrent contact washing with dilute ammonia water with a concentration of 30wt% from the top...

Embodiment 3

[0041] The composition, connection mode and process route of the ammonia purification device in this embodiment are detailed in Example 1

[0042] The ammonia purification process route and process conditions that the present embodiment adopts are:

[0043] (1) The composition of 55°C and 0.25MPa from the stripping deamination tower of the coal gasification wastewater treatment plant is NH 3 88wt%, H 2 O 8.4wt%, H 2 S 0.55wt%, CO 2 3.0 wt% and oil CO 2 0.05wt%, phenol 5000mg / m 3 Crude ammonia gas enters the purification tower 1 from the bottom, and is heated to 68° C. by the low-pressure steam at the bottom of the purification tower 1. The ammonia vapor first passes through the lower packing section in the purification tower 1 and the dilute ammonia water reflux liquid with a mass concentration of 20 wt% at the bottom of the purification tower 1. Reverse contact washing, and then through the upper packing section and the dilute ammonia water with a reflux concentration of...

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Abstract

The invention discloses a purification technology for ammonia recycled from wastewater from coal gasification. According to the purification technology, coarse ammonia from a deamination tower is firstly washed by a purification tower to remove impurities such as partial phenols, H2S, organic sulfur, CO2 and oil and then is discharged from the top of the purification tower; after being condensed, ammonia is refined to obtain liquid nitrogen. The purification technology has the advantages of high efficiency, energy conservation, good purification effect and high recycled ammonia purity.

Description

technical field [0001] The invention belongs to a purification process for recovering ammonia, in particular to an ammonia purification process for recovering coal gasification wastewater. technical background [0002] my country's "coal-rich, oil-poor, and gas-poor" energy structure determines that coal is still the most important chemical raw material in my country at this stage. Therefore, whether coal can be efficiently and cleanly transformed and utilized is related to the dual interests of my country's economy and environment. Coal gasification is the key link to realize coal conversion and utilization. At present, industrial coal gasification technologies mainly include fixed bed gasification, fluidized bed gasification and entrained bed gasification. The advantages of strong adaptability and low energy consumption have been widely used in coal chemical industry. However, a large amount of ammonia, phenol, CO 2 、H 2 The gasification wastewater with impurities such ...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01C1/10C02F101/16
Inventor 韩宝莲李晓范辉李婷杨丽历崔晓曦
Owner SEDIN ENG
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