Reheating method of liquid nitrogen washing cold box
A heating method and cold box technology, applied in the field of liquid nitrogen washing, can solve the problems of few reheating opportunities, inconvenient implementation and high energy consumption, and achieve the effects of long reheating time, time saving and high energy consumption
Active Publication Date: 2014-11-26
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, due to this reheating method, there are few passages for nitrogen to enter, the flow rate is small, and cold and heat exchange is required, so it takes a long time, low efficiency, large waste, and high energy consumption; The driving condition needs at least 7 days, and there is little chance of reheating, and it will only happen when the car is parked for a long time, so it is not easy to implement
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0015] Due to equipment reasons and lack of operating experience, the resistance of the feed gas channel of the liquid nitrogen cold box is as high as 720kpa. The daily output of the device with a daily output of 1,000 tons is only about 700 tons, and the device is forced to stop for reheating. The temperature inside the stopped cold box was -188°C, and the initial temperatures of the two feed gas coolers were -60°C and -188°C, respectively. Reheat nitrogen (0.4MPa) at room temperature through the feed gas pipeline, circulating hydrogen pipeline, original fuel gas pipeline, synthesis gas pipeline and high-pressure nitrogen pipeline respectively, and a total of five channels of nitrogen enter the cold box from outside the cold box. All the process pipelines of the tank and the cold discharge pipeline of the cold box directly discharge the cooled nitrogen out of the cold box.
[0016] The initial temperature of nitrogen fed through the synthesis gas line, feed gas line, fuel gas...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a reheating method of a liquid nitrogen washing cold box, which adds two reheating nitrogen inlet pipelines, one is a cold box feed gas pipeline, and the other is a circulating hydrogen pipeline. After being preliminarily cooled through a feed gas cooler, nitrogen entering through the feed gas pipeline enters a nitrogen washing tower, and after being preliminarily cooled through a high-pressure nitrogen cooler and a feed gas cooler, nitrogen entering through the circulating hydrogen pipeline also enters the nitrogen washing tower. The hydrogen of the two added pipelines also exchanges heat with low-temperature gas in the cold box, the hydrogen of the two pipelines and the hydrogen entering through three other pipelines jointly enable the temperature of the low-temperature gas in the cold box to rise until the temperature in the cold box is changed to be normal through heat exchange. By means of the method, heat exchange efficiency is improved, energy consumption of a system is greatly reduced, a lot of time is saved, resource waste is decreased, and cost for starting and stopping the system is saved.
Description
technical field [0001] The invention relates to the liquid nitrogen washing technology in the synthetic ammonia process, in particular to a method for reheating a liquid nitrogen washing cold box. Background technique [0002] In the ammonia synthesis industry, the raw material gas contains many impurities such as methane, carbon monoxide, and argon after being washed with low-temperature methanol. The carbon monoxide in it will poison the catalyst used in ammonia synthesis and lose its catalytic activity. Therefore, it must be cleaned by liquid nitrogen clear. Liquid nitrogen washing is to use impurities such as carbon monoxide, argon and methane to dissolve in liquid nitrogen to achieve the purpose of purification. However, because the critical temperature of most components contained in the raw material is low, the operation of liquid nitrogen washing all needs to be carried out in a cold box. However, when improper operation or equipment failure occurs, low-freezing su...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/52
Inventor 蒋志军樊宗林王军谢伟许令奇
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH