A mixed refrigerant biogas pressure liquefaction system and its working method
A technology of mixed refrigerant and working method, which is applied in the field of biogas liquefaction, can solve the problems of waste of carbon resources, complicated carbon removal process, etc., and achieve the effect of reasonable price, good application prospects and wide sources
Active Publication Date: 2021-04-27
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology
[0004] In order to solve the above-mentioned defects in the prior art, the purpose of the present invention is to provide a mixed refrigerant biogas pressure liquefaction system and its working method. The system design is reasonable and the degree of automation is high. CO removal from feed gas 2 The resulting carbon removal process is complicated and wastes carbon resources.
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[0035] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment, and its content is explanation of the present invention rather than limitation:
[0036] Such as figure 1 , the mixed refrigerant biogas pressurized liquefaction system of the present invention comprises a biogas pretreatment unit, a secondary membrane separation unit, a mixed refrigerant refrigeration cycle unit and CO 2 Distillation and purification unit;
[0037] The biogas pretreatment unit includes an activated carbon desulfurization tower 1, a low-pressure compressor 2, a molecular sieve 3 and a fine filter 4 connected in sequence, and the activated carbon desulfurization tower 1 is connected with a biogas inlet pipe;
[0038] The two-stage membrane separation unit includes a multi-stage compressor unit before separation, a first-stage membrane separator 7, a second-stage membrane separator 9, a first mixer 8 and a multi-stage compress...
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Abstract
The invention discloses a mixed refrigerant biogas pressure liquefaction system and its working method, which belong to the technical field of biogas liquefaction. Including biogas pretreatment unit, secondary membrane separation unit, mixed refrigerant refrigeration cycle unit and CO 2 Distillation and purification unit, the biogas is pressurized after being desulfurized, dehydrated and filtered by the biogas pretreatment unit, and high-purity CH is obtained by the secondary membrane separation unit 4 stream and rich CO 2 The stream biogas is liquefied and rectified under pressure to obtain liquid CH under pressure 4 and food-grade liquid CO 2 . The system has a reasonable design and a high degree of automation. It is used to solve the problems of complex raw material gas decarbonization process, harsh decarbonization indicators, and waste of carbon resources in the current biogas liquefaction process. It has a good application prospect.
Description
technical field [0001] The invention belongs to the technical field of biogas liquefaction, and in particular relates to a mixed refrigerant biogas liquefaction system under pressure and a working method thereof. Background technique [0002] In the past ten years, my country has gradually paid attention to and developed the biogas industry, and actively promoted the development of the biogas industry to the bio-natural gas industry. However, with the gradual development of my country's biogas projects towards large and medium-sized projects, the abundant biogas resources are facing the problem of follow-up consumption, especially when it is difficult to merge into the natural gas pipeline network and power generation grid. Using natural gas liquefaction technology to supply biogas liquefaction to surrounding LNG filling stations and urban residents is a way to realize short-distance transportation and commercial application of biogas. [0003] However, biogas contains a la...
Claims
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IPC IPC(8): F25J3/02F25J3/08C10L3/10B01D53/22
CPCF25J3/0219F25J3/0266F25J3/0295F25J3/08C10L3/101C10L3/103C10L3/106C10L3/104B01D53/226B01D53/229F25J2200/02F25J2200/50F25J2200/74F25J2205/40F25J2205/80F25J2210/66F25J2215/04F25J2270/66F25J2270/12F25J3/0209F25J3/0233F25J2230/30Y02C20/40F25J2220/82
Inventor 王勇常明亮全青
Owner XI'AN PETROLEUM UNIVERSITY