阅读说明：本技术 一种天然气脱汞装置 (Natural gas demercuration device ) 是由 张文辉 文豪 马永刚 于 2019-03-26 设计创作，主要内容包括：一种天然气脱汞装置,包括并列布置的两个脱汞塔和并列布置的两个过滤装置,所述脱汞塔内设置有气体分布器,所述气体分布器的上下两侧均设置有吸附床,脱汞塔的中部设置有与气体分布器连通的天然气进口,脱汞塔的顶部和底部均设置有天然气出口,所有的天然气出口通过管路汇聚后再分别通过支管与两个过滤装置的进气端连通,在每个天然气进口、每个天然气出口和每个过滤装置的进气端均设置有阀门。本发明通过设计多吸附塔吸附工艺,并且设置有双层吸附床,实现对规模较大、操作压力较高的天然气脱汞,可根据需要更加吸附塔的数量实现对大规模的天然气脱汞,经济效益高。(The utility model provides a natural gas demercuration device, is including two demercuration towers that arrange side by side and two filter equipment that arrange side by side, be provided with gas distributor in the demercuration tower, the upper and lower both sides of gas distributor all are provided with the adsorption bed, and the middle part of demercuration tower is provided with the natural gas import with gas distributor intercommunication, and the top and the bottom of demercuration tower all are provided with the natural gas export, and all natural gas exports through the pipeline assemble the back again respectively through branch pipe and two filter equipment's inlet end intercommunication, all are provided with the valve at every natural gas import, every natural gas export and every filter equipment's inlet end. According to the invention, by designing the multi-adsorption-tower adsorption process and arranging the double-layer adsorption beds, the demercuration of the natural gas with large scale and high operation pressure is realized, the demercuration of the natural gas with large scale can be realized by increasing the number of the adsorption towers according to the requirement, and the economic benefit is high.)

1. A natural gas demercuration device is characterized in that: the novel demercuration device comprises two demercuration towers which are arranged in parallel and two filtering devices which are arranged in parallel, wherein gas distributors are arranged in the demercuration towers, adsorption beds are arranged on the upper sides and the lower sides of the gas distributors, natural gas inlets communicated with the gas distributors are arranged in the middle of the demercuration towers, natural gas outlets are arranged at the tops and the bottoms of the demercuration towers, all the natural gas outlets are communicated with the gas inlet ends of the two filtering devices through branch pipes after being gathered through pipelines, and valves are arranged at the gas inlet ends of each natural gas inlet, each natural gas outlet and each filtering device.

2. The natural gas demercuration apparatus of claim 1, wherein: the gas distributor is provided with a buffer cavity, the buffer cavity is communicated with a natural gas outlet, and a plurality of gas outlets are uniformly distributed at the top and the bottom of the buffer cavity.

3. The natural gas demercuration apparatus of claim 1, wherein: the adsorption bed and the filtering device are both provided with differential pressure meters.

Technical Field

The invention relates to the field of natural gas demercuration, in particular to a natural gas demercuration device.

Background

With the development of national science and technology and the improvement of the living standard of people, the national requirements on environmental protection are higher and higher, particularly, the emission control of toxic and harmful pollutants is stricter, and the mercury pollution is widely concerned by countries all over the world as a global environmental problem. The mercury is a common harmful heavy metal element in natural gas, has high volatility, high toxicity and strong corrosivity, not only corrodes equipment but also brings great threat to human health in the natural gas treatment process, and once the mercury enters the environment, the mercury can cause environmental pollution. The mercury can cause serious corrosion to aluminum equipment, and the aluminum plate-fin heat exchanger is the core equipment of a natural gas liquefaction system, so that the mercury content is strictly controlled in the natural gas liquefaction system, and the mercury needs to be removed before entering a liquefaction device.

The chemical adsorption method is most applied to natural gas demercuration devices, and common demercuration adsorbents comprise sulfur-loaded activated carbon, supported metal sulfides and metal oxides. The demercuration agent is usually filled in a demercuration tower, natural gas continuously passes through the demercuration tower to chemically react with the demercuration agent so as to remove mercury in the natural gas, and the demercuration agent needs to be replaced when the demercuration agent is saturated.

At present, natural gas demercuration devices by chemical adsorption methods at home and abroad generally adopt a single-tower adsorption process, because chemical reaction needs a certain time, when the device scale is large and the operation pressure is high, the method of reducing the space velocity by increasing the tower diameter to ensure the effective contact time is not economical, particularly, when the gas treatment amount is large and the mercury content in the raw gas is low (less than 1ug/Nm 3), the height of an adsorbent bed is required to be small and the adsorption sectional area is large, the height-diameter ratio of the adsorption tower at the moment is small (hamburger type) and the number is large, the system is not economical, the equipment arrangement is not reasonable, and the field space utilization rate is low.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an economic demercuration device which has large natural gas treatment scale and low mercury content in raw material gas.

The technical scheme of the invention is as follows: the utility model provides a natural gas demercuration device, is including two demercuration towers that arrange side by side and two filter equipment that arrange side by side, be provided with gas distributor in the demercuration tower, the upper and lower both sides of gas distributor all are provided with the adsorption bed, and the middle part of demercuration tower is provided with the natural gas import with gas distributor intercommunication, and the top and the bottom of demercuration tower all are provided with the natural gas export, and all natural gas exports through the pipeline assemble the back again respectively through branch pipe and two filter equipment's inlet end intercommunication, all are provided with the valve at every natural gas import, every natural gas export and every filter equipment's inlet end.

The gas distributor is provided with a buffer cavity, the buffer cavity is communicated with a natural gas outlet, and a plurality of gas outlets are uniformly distributed at the top and the bottom of the buffer cavity.

The adsorption bed and the filtering device are both provided with differential pressure meters.

The invention has the beneficial effects that: according to the invention, by designing the multi-adsorption-tower adsorption process and arranging the double-layer adsorption beds, the demercuration of the natural gas with large scale and high operation pressure is realized, the demercuration of the natural gas with large scale can be realized by increasing the number of the adsorption towers according to the requirement, and the economic benefit is high.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure, 1-demercuration tower, 2-filtering device, 3-gas distributor, 4-adsorption bed, 5-differential pressure meter, 6-valve V1A, 7-valve V2A, 8-valve V3A, 9-valve V1B, 10-valve V2B, 11-valve V3B, 12-valve V4A, 13-valve V5A, 14-valve V4B, 15-valve V5B.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

as shown in fig. 1, a natural gas demercuration device comprises two demercuration towers 1 arranged in parallel and two filtering devices 2 arranged in parallel, wherein a gas distributor 3 is arranged in each demercuration tower 1, adsorption beds 4 are arranged on the upper side and the lower side of each gas distributor 3, a natural gas inlet communicated with the gas distributor 3 is arranged in the middle of each demercuration tower 1, natural gas outlets are arranged at the top and the bottom of each demercuration tower 1, all the natural gas outlets are converged through pipelines and then communicated with the gas inlet ends of the two filtering devices 2 through branch pipes, valves are arranged at each natural gas inlet, each natural gas outlet and the gas inlet end of each filtering device, and when the filtering devices and the demercuration towers need to be replaced, only the relevant valves need to be controlled, and the replacement is completed without affecting the process.

The gas distributor 3 is provided with a buffer cavity, the buffer cavity is communicated with a natural gas outlet, a plurality of gas outlets are uniformly distributed at the top and the bottom of the buffer cavity, and a related buffer effect is achieved in the process of demercuration of a large amount of natural gas.

The adsorption bed 4 and the filtering device 2 are both provided with a differential pressure meter 5 for monitoring pressure.