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CN109135857A - A kind of compressed biogas treatment process and system - Google Patents

A kind of compressed biogas treatment process and system Download PDF

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Publication number
CN109135857A
CN109135857A CN201811282156.8A CN201811282156A CN109135857A CN 109135857 A CN109135857 A CN 109135857A CN 201811282156 A CN201811282156 A CN 201811282156A CN 109135857 A CN109135857 A CN 109135857A
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Prior art keywords
biogas
compressed biogas
temperature
compressed
treatment
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张忠家
陶晓芳
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TIANJIN HI-TECH INDUSTRIAL Co Ltd
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TIANJIN HI-TECH INDUSTRIAL Co Ltd
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Priority to CN201811282156.8A priority Critical patent/CN109135857A/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

本发明是一种压缩沼气处理工艺，包括的步骤有：第一步：对粗沼气进行前端处理；第二步：第一压缩沼气的冷冻干燥处理和温度处理；第三步：第四压缩沼气的净化和提纯；第四步：第一天然气的膨胀减压处理。一种压缩沼气处理系统，包括前端处理组件、回热器E‑05、换热器E‑06、精密过滤净化组件、膨胀减压装置、沼气膜组。本发明所述的一种压缩沼气处理工艺及系统，使用方便，充分利用沼气在处理过程中温度和压力的变化，对能源进行充分的利用，并通过膨胀减压装置做功发电，环保节能效果良好。

The invention is a compressed biogas treatment process, which includes the following steps: the first step: front-end treatment of the crude biogas; the second step: the freeze drying treatment and temperature treatment of the first compressed biogas; the third step: the fourth compressed biogas The fourth step: the expansion and decompression treatment of the first natural gas. A compressed biogas processing system includes a front-end processing component, a regenerator E-05, a heat exchanger E-06, a precision filtration and purification component, an expansion and decompression device, and a biogas membrane group. The compressed biogas treatment process and system of the present invention are easy to use, make full use of the changes in temperature and pressure of the biogas in the treatment process, make full use of energy, and generate power through the expansion and decompression device, and have good environmental protection and energy saving effects. .

Description

A kind of compressed biogas treatment process and system
Technical field
The present invention relates to compressed biogas process field more particularly to a kind of compressed biogas treatment process and system.
Background technique
Biogas be organic substance under anaerobic, a kind of mixed gas generated by the fermentation of microorganism. Biogas, as the term suggests it is exactly the gas in marsh.It is often seen that thering is bubble to emerge in marshland, Bilge or manure pit Come, if we draw match, it be lighted, here it is the biogas that nature naturally occurs so long.Since this gas is at first Swampy, so referred to as biogas.The various organic matters such as human and animal excreta, stalk, sewage in closed methane-generating pit, It ferments under the conditions of anaerobism (not having oxygen), by miscellaneous methane fermentating microorganism decomposition and inversion, to generate biogas.
Biogas is the mixture of multiple gases, and characteristic is similar to natural gas.Biogas is except directly burning is for cooking, drying Agricultural and sideline product, heating, illumination and gas welding etc. are outer, can also make the fuel and production methanol, formalin, carbon tetrachloride of internal combustion engine Equal industrial chemicals.The feed liquid and sediment being discharged after firedamp gas equipment ferments, containing more rich nutriment, can be used as fertilizer and Feed.
Biogas, which needs to carry out multi step strategy, could become natural gas, just can be supplied to user and use, in traditional treatment process The refrigerant needed in the step of being related to heat exchange is generally the refrigerants such as freon, is typically generated by cooling driers, needs volume The consumption of outer energy, not environmentally friendly enough, waste of energy.
For this purpose, designing a kind of compressed biogas treatment process and system, problem above is solved.
Summary of the invention
The present invention is to overcome the above deficiency, provides a kind of compressed biogas treatment process and system.
A kind of compressed biogas treatment process, comprises the step of:
Step 1: carrying out front-end processing to thick biogas:
Thick biogas is forced into 13BAR through front end desulfurization deamination process, using helical-lobe compressor, and passes through at cooling Reason, has obtained the first compressed biogas that temperature is 50 DEG C and pressure is 13BAR；
Step 2: the freeze-drying process and Temperature Treatment of the first compressed biogas:
First compressed biogas is needed by freeze-drying process and Temperature Treatment, the freeze-drying process and Temperature Treatment It is after the first compressed biogas to be passed through to regenerator E-05 and the progress heat exchange of the first refrigerant, to be cooled to 10 DEG C, become the second compression Biogas, the pressure of second compressed biogas are 13BAR, and temperature is 10 DEG C；Second compressed biogas enters heat exchanger E-06 and After two refrigerants carry out heat exchange, become third compressed biogas, the temperature of the third compressed biogas is 3 DEG C, pressure 13BAR； Third compressed biogas removes condensed water by centrifugation dehydrater simultaneously；
The third compressed biogas after removing condensed water is used as first refrigerant and first in regenerator E-05 For temperature recovery to 25 DEG C, pressure 13BAR, gas pressure dew point is 3 DEG C, becomes the 4th pressure after compressed biogas carries out heat exchange Contracting biogas, the 4th compressed biogas have reached the dew point and temperature requirement of biogas film group process gas, can reduce the refrigeration of technique Power；
Step 3: the purification and purification of the 4th compressed biogas:
4th compressed biogas carries out compressed biogas purification after secondary filter purified treatment, into biogas film group, Produce the first natural gas that pressure is 10-13BAR, temperature is 25 DEG C；
Step 4: the expansion decompression of the first natural gas is handled:
Because user's point of use gas pressure requirement be 4BAR and 25 DEG C, it is therefore desirable to the first natural gas into The processing of row expansion decompression；It selects expansion decompression device to carry out decompression expansion processing to the first natural gas, generates cold energy, obtain second Natural gas, the pressure of second natural gas are 4BAR, and temperature is 3-5 DEG C, and pressure has reached the requirement of user's point of use；
Pressure is 4BAR, and second natural gas that temperature is 3-5 DEG C is as second refrigerant in second step The heat exchanger E-06 of second compressed biogas neutralizes the second compressed biogas and carries out heat exchange, can reduce the refrigeration work consumption of technique；By Second natural gas temperature after heat exchange becomes 25 DEG C, and temperature has reached the requirement of user's point of use.
Preferably, the mechanical energy of the first natural gas can be exported be used to generate electricity simultaneously by the expansion decompression device.
A kind of compressed biogas processing system, including front end processing components, regenerator E-05, heat exchanger E-06, secondary filter Purification assembly, expansion decompression device, biogas film group；
The regenerator E05 point is backheat pipeline and the first refrigerant pipe, the backheat pipeline and first refrigerant pipe Road is arranged parallel can be achieved heat exchange；
The heat exchanger E06 point is heat exchange pipeline and the second refrigerant pipe, the heat exchange pipeline and second refrigerant pipe Road is arranged parallel can be achieved heat exchange；
The front end processing components connect the entrance of the backheat pipeline of the regenerator E-05,
The outlet of the backheat pipeline of the regenerator E05 connects the heat exchange pipeline of the heat exchanger E06；
The outlet side of the heat exchange pipeline of the heat exchanger E06 is connected with centrifugation except water pot, and the centrifugation connects institute except water pot State the entrance of first refrigerant pipe of regenerator E05；
The outlet of first refrigerant pipe of the regenerator E05 connects the secondary filter purification assembly, the essence Close filtration, purification component connects the biogas film group；
The biogas film group connects the gas access of the expansion decompression device, the gas vent of the expansion decompression device Connect the entrance of second refrigerant pipe of the heat exchanger E06.
Further, expansion decompression device includes host, lubricating oil system and control and grid-connected system three parts.
The beneficial effects of the present invention are:
A kind of compressed biogas treatment process and system of the present invention, it is easy to use, make full use of biogas processed The variation of temperature and pressure in journey adequately utilizes the energy, and passes through the acting power generation of expansion decompression device, environmental protection and energy saving It works well.
Detailed description of the invention
Fig. 1 is a kind of compressed biogas processing technological flow figure of the present invention.
Fig. 2 is a kind of block diagram of compressed biogas processing system of the present invention.
Wherein: 1- front end processing components；2- regenerator E-05；3- heat exchanger E-06；4- secondary filter purification assembly；5- is swollen Swollen decompressor；6- biogas film group；7- centrifugation removes water pot.
Specific embodiment
It is described in detail below with reference to the embodiment of the present invention referring to attached drawing.
The present invention relates to a kind of compressed biogas treatment process and systems.
A kind of compressed biogas treatment process, comprises the step of:
Step 1: carrying out front-end processing to thick biogas:
Thick biogas is forced into 13BAR through front end desulfurization deamination process, using helical-lobe compressor, and passes through at cooling Reason, has obtained the first compressed biogas that temperature is 50 DEG C and pressure is 13BAR；
Step 2: the freeze-drying process and Temperature Treatment of the first compressed biogas:
First compressed biogas is needed by freeze-drying process and Temperature Treatment, the freeze-drying process and Temperature Treatment It is after the first compressed biogas to be passed through to regenerator E-052 and the progress heat exchange of the first refrigerant, to be cooled to 10 DEG C, become the second compression Biogas, the pressure of second compressed biogas are 13BAR, and temperature is 10 DEG C；Second compressed biogas enters heat exchanger E-063 and After two refrigerants carry out heat exchange, become third compressed biogas, the temperature of the third compressed biogas is 3 DEG C, pressure 13BAR； Third compressed biogas removes condensed water by centrifugation dehydrater 7 simultaneously；
The third compressed biogas after removing condensed water is used as first refrigerant and first in regenerator E-05 For temperature recovery to 25 DEG C, pressure 13BAR, gas pressure dew point is 3 DEG C, becomes the 4th pressure after compressed biogas carries out heat exchange Contracting biogas, the 4th compressed biogas have reached the dew point and temperature requirement of 6 process gas of biogas film group, can reduce the refrigeration of technique Power；
Step 3: the purification and purification of the 4th compressed biogas:
4th compressed biogas carries out compressed biogas purification after secondary filter purified treatment, into biogas film group, Produce the first natural gas that pressure is 10-13BAR, temperature is 25 DEG C；
Step 4: the expansion decompression of the first natural gas is handled:
Because user's point of use gas pressure requirement be 4BAR and 25 DEG C, it is therefore desirable to the first natural gas into The processing of row expansion decompression；It selects expansion decompression device 5 to carry out decompression expansion processing to the first natural gas, generates cold energy, obtain the Two natural gases, the pressure of second natural gas are 4BAR, and temperature is 3-5 DEG C, and pressure has reached the requirement of user's point of use；Pressure Power is 4BAR, and second natural gas that temperature is 3-5 DEG C is as second refrigerant for the second compression natural pond in second step The heat exchanger E-06 of gas neutralizes the second compressed biogas and carries out heat exchange, can reduce the refrigeration work consumption of technique；Institute after heat exchange Stating the second natural gas temperature becomes 25 DEG C, and temperature has reached the requirement of user's point of use.
Preferably, the mechanical energy of the first natural gas can be exported be used to generate electricity simultaneously by the expansion decompression device.
A kind of compressed biogas processing system, including front end processing components 1, regenerator E-052, heat exchanger E-063, accurate mistake Filter purification assembly 4, expansion decompression device 5, biogas film group 6；
The regenerator E05 point is backheat pipeline and the first refrigerant pipe, the backheat pipeline and first refrigerant pipe Road is arranged parallel can be achieved heat exchange；
The heat exchanger E06 point is heat exchange pipeline and the second refrigerant pipe, the heat exchange pipeline and second refrigerant pipe Road is arranged parallel can be achieved heat exchange；
The front end processing components connect the entrance of the backheat pipeline of the regenerator E-05,
The outlet of the backheat pipeline of the regenerator E05 connects the heat exchange pipeline of the heat exchanger E06；
The outlet side of the heat exchange pipeline of the heat exchanger E06 is connected with centrifugation except water pot 7, and the centrifugation connects institute except water pot State the entrance of first refrigerant pipe of regenerator E05；
The outlet of first refrigerant pipe of the regenerator E05 connects the secondary filter purification assembly, the essence Close filtration, purification component connects the biogas film group；
The biogas film group connects the gas access of the expansion decompression device, the gas vent of the expansion decompression device Connect the entrance of second refrigerant pipe of the heat exchanger E06.
Further, expansion decompression device includes host, lubricating oil system and control and grid-connected system three parts.
A kind of application method of compressed biogas processing system:
Thick biogas by the front end processing components by process such as front end desulfurization deaminations, using helical-lobe compressor It is forced into 13BAR, and by cooling treatment, has obtained the first compressed biogas that temperature is 50 DEG C and pressure is 13BAR；
First compressed biogas is needed by freeze-drying process and Temperature Treatment, the freeze-drying process and Temperature Treatment It is after the first compressed biogas to be passed through to regenerator E-05 and the progress heat exchange of the first refrigerant, to be cooled to 10 DEG C, become the second compression Biogas, the pressure of second compressed biogas are 13BAR, and temperature is 10 DEG C；Second compressed biogas enters heat exchanger E-06 and After two refrigerants carry out heat exchange, become third compressed biogas, the temperature of the third compressed biogas is 3 DEG C, pressure 13BAR； Third compressed biogas removes condensed water by centrifugation dehydrater simultaneously；
The third compressed biogas after removing condensed water is used as first refrigerant and first in regenerator E-05 For temperature recovery to 25 DEG C, pressure 13BAR, gas pressure dew point is 3 DEG C, becomes the 4th pressure after compressed biogas carries out heat exchange Contracting biogas, the 4th compressed biogas have reached the dew point and temperature requirement of biogas film group process gas, can reduce the refrigeration of technique Power；
4th compressed biogas is after the secondary filter purified treatment of secondary filter purification assembly, into biogas film group Compressed biogas purification is carried out, the first natural gas that pressure is 10-13BAR, temperature is 25 DEG C is produced；
Because user's point of use gas pressure requirement be 4BAR and 25 DEG C, it is therefore desirable to the first natural gas into The processing of row expansion decompression；It selects expansion decompression device to carry out decompression expansion processing to the first natural gas, generates cold energy, obtain second Natural gas, the pressure of second natural gas are 4BAR, and temperature is 3-5 DEG C, and pressure has reached the requirement of user's point of use；Pressure For 4BAR, second natural gas that temperature is 3-5 DEG C is as second refrigerant for the second compressed biogas in second step Heat exchanger E-06 neutralize the second compressed biogas carry out heat exchange, the refrigeration work consumption of technique can be reduced；Described in after heat exchange Second natural gas temperature becomes 25 DEG C, and temperature has reached the requirement of user's point of use.
The mechanical energy of first natural gas can be exported be used to generate electricity simultaneously by the expansion decompression device.
A kind of compressed biogas processing system in the process of running, realizes dynamic balance.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without It can be interpreted as indication or suggestion relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the One ", the feature of " second " etc. can explicitly or implicitly include one or more of the features.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " " connects Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair by concrete condition Concrete meaning in bright.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (4)

1.一种压缩沼气处理工艺，其特征在于，包括的步骤有：1. a compressed biogas processing technique, is characterized in that, the steps that comprise are: 第一步：对粗沼气进行前端处理：The first step: front-end treatment of crude biogas: 粗沼气经前端脱硫脱氨工艺处理，再经过螺杆压缩机加压至13BAR，并通过冷却处理，得到了温度为50℃且压力为13BAR的第一压缩沼气；The crude biogas is processed by the front-end desulfurization and deamination process, then pressurized to 13BAR by a screw compressor, and cooled to obtain the first compressed biogas with a temperature of 50°C and a pressure of 13BAR; 第二步：第一压缩沼气的冷冻干燥处理和温度处理：Step 2: Freeze drying and temperature treatment of the first compressed biogas: 第一压缩沼气需要经过冷冻干燥处理和温度处理，所述冷冻干燥处理和温度处理是将第一压缩沼气通入回热器E-05和第一冷媒进行热交换后，降温至10℃，成为第二压缩沼气，所述第二压缩沼气的压力为13BAR，温度为10℃；第二压缩沼气进入换热器E-06和第二冷媒进行热交换后，成为第三压缩沼气，所述第三压缩沼气的温度为3℃，压力为13BAR；同时第三压缩沼气经过离心除水器除掉冷凝水；The first compressed biogas needs to undergo freeze-drying treatment and temperature treatment. The freeze-drying treatment and temperature treatment are performed by passing the first compressed biogas into the regenerator E-05 and the first refrigerant for heat exchange, and then cooling down to 10°C to become The second compressed biogas has a pressure of 13BAR and a temperature of 10°C; the second compressed biogas enters the heat exchanger E-06 and exchanges heat with the second refrigerant, and becomes the third compressed biogas. The temperature of the third compressed biogas is 3℃, and the pressure is 13BAR; meanwhile, the third compressed biogas is passed through a centrifugal water eliminator to remove the condensed water; 除掉冷凝水后的所述第三压缩沼气用作为回热器E-05中的所述第一冷媒，和第一压缩沼气进行热交换后温度回升至25℃，压力为13BAR，气体压力露点为3℃，成为了第四压缩沼气，所述第四压缩沼气达到了沼气膜组工艺气的露点和温度要求，可降低工艺的制冷功率；The third compressed biogas after removing the condensed water is used as the first refrigerant in the regenerator E-05, and after heat exchange with the first compressed biogas, the temperature rises to 25°C, the pressure is 13BAR, and the gas pressure dew point When the temperature is 3°C, it becomes the fourth compressed biogas, and the fourth compressed biogas meets the dew point and temperature requirements of the biogas membrane group process gas, which can reduce the refrigeration power of the process; 第三步：第四压缩沼气的净化和提纯：Step 3: Purification and purification of the fourth compressed biogas: 所述第四压缩沼气经过精密过滤净化处理后，进入沼气膜组进行压缩沼气提纯，生产出压力为10-13BAR、温度为25℃的第一天然气；After the fourth compressed biogas is purified by precision filtration, it enters the biogas membrane group for purification of the compressed biogas, and produces the first natural gas with a pressure of 10-13 BAR and a temperature of 25°C; 第四步：第一天然气的膨胀减压处理：Step 4: Expansion and decompression treatment of the first natural gas: 因用户使用点的天然气压力的使用要求为4BAR和25℃，因此需要对第一天然气进行膨胀减压处理；选用膨胀减压装置对第一天然气进行减压膨胀处理，产生冷能，得到第二天然气，所述第二天然气的压力为4BAR，温度为3-5℃，压力达到了用户使用点的要求；Because the use requirements of the natural gas pressure at the user's point of use are 4BAR and 25°C, the first natural gas needs to be expanded and decompressed; Natural gas, the pressure of the second natural gas is 4BAR, the temperature is 3-5°C, and the pressure meets the requirements of the user's point of use; 压力为4BAR，温度为3-5℃的所述第二天然气作为所述第二冷媒用于第二步中的第二压缩沼气的换热器E-06中和第二压缩沼气进行热交换，可降低工艺的制冷功率；经过换热后的所述第二天然气温度变为25℃，温度达到了用户使用点的要求。The second natural gas with a pressure of 4BAR and a temperature of 3-5°C is used as the second refrigerant in the heat exchanger E-06 of the second compressed biogas in the second step to conduct heat exchange with the second compressed biogas, The cooling power of the process can be reduced; the temperature of the second natural gas after heat exchange becomes 25°C, and the temperature reaches the requirements of the user's point of use. 2.根据权利要求1所述的一种压缩沼气处理工艺，其特征在于，所述膨胀减压装置同时可将第一天然气的机械能输出用于发电。2 . The compressed biogas treatment process according to claim 1 , wherein the expansion and decompression device can simultaneously output the mechanical energy of the first natural gas for power generation. 3 . 3.一种压缩沼气处理系统，其特征在于，包括前端处理组件、回热器E-05、换热器E-06、精密过滤净化组件、膨胀减压装置、沼气膜组；3. A compressed biogas treatment system, characterized in that it comprises a front-end treatment assembly, a regenerator E-05, a heat exchanger E-06, a precision filtration and purification assembly, an expansion and decompression device, and a biogas membrane group; 所述回热器E05分为回热管道和第一冷媒管道，所述回热管道和所述第一冷媒管道并行布置可实现热交换；The regenerator E05 is divided into a heat return pipe and a first refrigerant pipe, and the heat return pipe and the first refrigerant pipe are arranged in parallel to realize heat exchange; 所述换热器E06分为换热管道和第二冷媒管道，所述换热管道和所述第二冷媒管道并行布置可实现热交换；The heat exchanger E06 is divided into a heat exchange pipe and a second refrigerant pipe, and the parallel arrangement of the heat exchange pipe and the second refrigerant pipe can realize heat exchange; 所述前端处理组件连接所述回热器E-05的所述回热管道的入口，The front-end processing assembly is connected to the inlet of the regenerator pipe of the regenerator E-05, 所述回热器E05的所述回热管道的出口连接所述换热器E06的所述换热管道；The outlet of the heat return pipe of the regenerator E05 is connected to the heat exchange pipe of the heat exchanger E06; 所述换热器E06的换热管道的出气端连接有离心除水罐，所述离心除水罐连接所述回热器E05的所述第一冷媒管道的入口；The air outlet of the heat exchange pipe of the heat exchanger E06 is connected with a centrifugal water removal tank, and the centrifugal water removal tank is connected to the inlet of the first refrigerant pipe of the regenerator E05; 所述回热器E05的所述第一冷媒管道的出口连接所述精密过滤净化组件，所述精密过滤净化组件连接所述沼气膜组；The outlet of the first refrigerant pipe of the regenerator E05 is connected to the precision filtration and purification component, and the precision filtration and purification component is connected to the biogas membrane group; 所述沼气膜组连接所述膨胀减压装置的气体入口，所述膨胀减压装置的气体出口连接所述换热器E06的所述第二冷媒管道的入口。The biogas membrane group is connected to the gas inlet of the expansion and decompression device, and the gas outlet of the expansion and decompression device is connected to the inlet of the second refrigerant pipeline of the heat exchanger E06. 4.根据权利要求3所述的一种压缩沼气处理系统，其特征在于，膨胀减压装置包括主机、润滑油系统和控制及并网系统三部分。4 . A compressed biogas treatment system according to claim 3 , wherein the expansion and decompression device includes three parts: a main engine, a lubricating oil system, and a control and grid-connected system. 5 .
CN201811282156.8A 2018-10-31 2018-10-31 A kind of compressed biogas treatment process and system Pending CN109135857A (en)

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CN104909456A (en) * 2015-05-25 2015-09-16 上海成越新能源科技有限公司 Landfill leachate anaerobic biogas purification method
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Application publication date: 20190104