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Technology for combining shift conversion gas pressure swing adsorption with ammonia water after-purification for decarburization

A technology of pressure swing adsorption and gas conversion, which is applied in the preparation/separation of ammonia, gas treatment, chemical instruments and methods, etc. It can solve the problems of excess dilute ammonia water and the inability to meet the zero emission requirements of dilute ammonia water

Inactive Publication Date: 2017-05-31
杨皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonia gas brought out from the auxiliary tower by the mixed gas is much more than the ammonia gas brought out from the auxiliary tower when there is no pressure swing adsorption purification gas mixed, and the amount of ammonia gas brought out from the fixed auxiliary tower is also large, resulting in a thin recovery tower There is a serious excess of ammonia water, which cannot meet the zero emission requirements of dilute ammonia water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: A 60,000-ton / year synthetic ammonia plant, 0.8MPa pressure, a total of 36,000 standard cubic meters / hour shift gas, 21,000 standard cubic meters / hour shift gas sent to the main carbonization tower, the carbonization main tower outlet carbon dioxide concentration 5-8% It is sent to the auxiliary tower, and the carbon dioxide concentration at the outlet of the auxiliary tower is 0.8~1.0% to the fixed auxiliary tower, and the carbon dioxide concentration at the outlet of the fixed auxiliary tower is 0.1% to the recovery cleaning tower. 15,000 standard cubic meters / hour shift gas transmission pressure swing adsorption, purified gas carbon dioxide concentration is 1.1%, purified gas is sent to the newly established sulfur-free ammonia purification tower, the outlet gas carbon dioxide concentration reaches 0.1%, sulfur-free ammonia water is 30-50 drops 20~30% is replaced every 8 hours, and the replaced sulfur-free carbonized ammonia water is sent to the carbonized di...

Embodiment 2

[0011] Example 2: A 60,000-ton / year synthetic ammonia plant, with a pressure of 1.3 MPa, a total of 36,000 standard cubic meters per hour of shift gas, 21,000 standard cubic meters per hour of shift gas sent to the main carbonization tower, the carbonization main tower outlet carbon dioxide concentration 5-8% It is sent to the auxiliary tower, and the carbon dioxide concentration at the outlet of the auxiliary tower is 0.8~1.0% to the fixed auxiliary tower, and the carbon dioxide concentration at the outlet of the fixed auxiliary tower is 0.1% to the recovery cleaning tower. 15,000 standard cubic meters / hour shift gas transmission pressure swing adsorption, purified gas carbon dioxide concentration is 3.0%, purified gas is sent to the newly established 2 sulfur-free ammonia purification towers, the outlet gas carbon dioxide concentration reaches 0.1%, and the first tower is sulfur-free Ammonia has a titer of 80 to 100, and it is replaced by 20 to 30% every 8 hours. The replaced ...

Embodiment 3

[0012] Example 3: An 80,000 tons / year synthetic ammonia plant, 0.8MPa pressure, a total of 48,000 standard cubic meters / hour shift gas, 33,000 standard cubic meters / hour shift gas sent to the main carbonization tower, the carbonization main tower outlet carbon dioxide concentration 5-8% It is sent to the auxiliary tower, and the carbon dioxide concentration at the outlet of the auxiliary tower is 0.8~1.0% to the fixed auxiliary tower, and the carbon dioxide concentration at the outlet of the fixed auxiliary tower is 0.1% to the recovery cleaning tower. 15,000 standard cubic meters / hour shift gas transmission pressure swing adsorption, purified gas carbon dioxide concentration is 4.5%, purified gas is sent to the newly established 2 sulfur-free ammonia purification towers, the outlet gas carbon dioxide concentration reaches 0.1%, and the first tower is sulfur-free Ammonia has a titer of 80 to 100, and it is replaced by 20 to 30% every 8 hours. The replaced sulfur-free carbonized ...

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PUM

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Abstract

The invention relates to a technology for combining shift conversion gas pressure swing adsorption with ammonia water after-purification for decarburization. A whole synthesis ammonia production device is provided, part of the shift conversion gas enters a carbonization equipment to produce ammonium bicarbonate, the concentration of carbon dioxide at a carbonization outlet is controlled to be 0.1-0.2%; part of the shift conversion gas enters a pressure swing adsorption device for decarburization, the concentration of carbon dioxide at an outlet is controlled to be 1.1-5.0%, and first-grade decarbonization gas is obtained; the first-grade decarbonization gas is sent to 1-2 specially-built sulfur-free diluted ammonia water tower to purify carbon dioxide continuously, the concentration of gas carbon dioxide at an outlet of the last diluted ammonia water tower is controlled to be 0.1-0.2%, and purified gas is obtained; the concentration at the last sulfur-free diluted ammonia water tower ammonia water inlet is controlled to be 30-50 titer, 20-30% of the ammonia water is replaced very 8 hours, the ammonia water temperature is controlled to be 35 DEG C or below, and sulfur-free ammonia water tower outlet gas and fixed assistant tower outlet gas of the carbonization equipment are mixed to enter a recycling cleaning tower, and sulfur-free carbonated ammonia water is sent to the shift conversion gas carbonization process for use.

Description

Technical field [0001] The invention relates to the fields of chemical industry and environmental protection, and is a method for effectively reducing production energy consumption and reducing raw material consumption. Background technique [0002] 1. For the synthetic ammonia production plant with carbonization equipment, at the beginning of construction, all the shift gas is removed from carbon dioxide through the carbonization equipment, and the concentration control index of carbon dioxide purification gas is 0.1~0.2%. Because the simple production of ammonium bicarbonate affects the sales of enterprises, part of the shift gas is usually used to remove carbon dioxide by pressure swing adsorption, thereby producing a part of commercial liquid ammonia. Usually, the carbon dioxide concentration control index in the outlet gas of the pressure swing adsorption device is 0.1~0.2% . [0003] 2. The outlet concentration of PSA decarburization is controlled at 0.1~0.2%. When a one-sta...

Claims

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Application Information

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IPC IPC(8): B01D53/047C01C1/04
CPCB01D53/047B01D2253/10B01D2257/504C01C1/04Y02C20/40
Inventor 杨皓曲思霖宁平
Owner 杨皓