阅读说明：本技术 一种大中型沼气净化方法 (Large and medium-sized biogas purification method ) 是由 吴坤玫 孙溪 于 2018-08-02 设计创作，主要内容包括：一种大中型沼气净化方法,属于生物工程技术领域,是主要由调节池、预处理装置、厌氧消化器、后处理排放罐、污泥存储罐、脱硫装置、脱水装置、脱二氧化碳装置和储存装置组成的,其特征在于：所述调节池和预处理装置相连接,预处理装置和厌氧消化器相连接,厌氧消化器和后处理排放罐相连接,厌氧消化器和污泥存储罐相连接,厌氧消化器与脱硫装置相连接,脱硫装置和脱水装置相连接,脱水装置和脱二氧化碳装置相连接,脱二氧化碳装置和储存装置相连接,本发明的大中型沼气净化方法,使用了脱硫净化的新工艺方法,使生物质转换能得到更充分利用,对改变我国传统的能源生产、利用生物质能等清洁可再生能源,对建立可持续发展的能源系统有重要意义。(A large and medium-sized biogas purification method belongs to the technical field of bioengineering, mainly comprises a regulating tank, a pretreatment device, an anaerobic digester, a post-treatment discharge tank, a sludge storage tank, a desulfurization device, a dehydration device, a carbon dioxide removal device and a storage device, and is characterized in that: the large and medium-sized biogas purification method uses a new process method of desulfurization and purification, so that the conversion energy of biomass is more fully utilized, and the method has important significance for changing the traditional energy production in China and utilizing clean renewable energy sources such as biomass energy and the like and establishing a sustainable development energy system.)

1. A large and medium-sized biogas purification method mainly comprises a regulating tank, a pretreatment device, an anaerobic digester, a post-treatment discharge tank, a sludge storage tank, a desulfurization device, a dehydration device, a carbon dioxide removal device and a storage device, and is characterized in that: the adjusting tank is connected with the pretreatment device, the pretreatment device is connected with the anaerobic digester, the anaerobic digester is connected with the post-treatment discharge tank, the anaerobic digester is connected with the sludge storage tank, the anaerobic digester is connected with the desulfurization device, the desulfurization device is connected with the dehydration device, the dehydration device is connected with the decarbonization device, and the decarbonization device is connected with the storage device.

2. The large and medium-sized biogas purification method according to claim 1, wherein: in order to enable the gas-liquid two phases of the marsh gas to meet the separation requirements of process specifications, a horizontal filter screen and a vertical filter screen are arranged in the tower, the marsh gas enters from the upper part of the device in a tangential mode under certain pressure, rotates under the action of centrifugal force, then sequentially passes through the horizontal filter screen and the vertical filter screen to promote the water vapor in the marsh gas to be separated from the marsh gas, and then water drops in the device flow downwards along the inner wall and are accumulated at the bottom of the device and are periodically discharged.

3. The large and medium-sized biogas purification method according to claim 1, wherein: the carbon dioxide removing device removes carbon dioxide by using a lime water solution absorption method, and mainly utilizes carbon dioxide and a calcium hydroxide water solution to generate calcium carbonate precipitate so as to remove carbon dioxide in the biogas, and the purified products are calcium carbonate and water without causing secondary pollution.

Technical Field

The invention relates to a large and medium-sized biogas purification method, belonging to the technical field of bioengineering.

Background

With the continuous and deep development of development and utilization of renewable energy sources in China, the construction amount and the maintenance amount of large and medium-sized biogas projects in China are continuously increased, the biogas use field of the large and medium-sized biogas projects is continuously widened, and the quality requirement on biogas is continuously improved. At present, most of large and medium-sized biogas projects in China still only refer to the purification technology of rural household small biogas digesters, and the purification requirements cannot be met. Therefore, the research on the purification technology of biogas increasingly shows its importance and urgency. The invention develops a large and medium-sized biogas purification method.

Disclosure of Invention

Aiming at the defects, the invention provides a large and medium-sized biogas purification method.

The invention is realized by the following technical scheme: a large and medium-sized biogas purification method mainly comprises a regulating tank, a pretreatment device, an anaerobic digester, a post-treatment discharge tank, a sludge storage tank, a desulfurization device, a dehydration device, a carbon dioxide removal device and a storage device, and is characterized in that: the adjusting tank is connected with the pretreatment device, the pretreatment device is connected with the anaerobic digester, the anaerobic digester is connected with the post-treatment discharge tank, the anaerobic digester is connected with the sludge storage tank, the anaerobic digester is connected with the desulfurization device, the desulfurization device is connected with the dehydration device, the dehydration device is connected with the decarbonization device, and the decarbonization device is connected with the storage device.

In order to enable the gas-liquid two phases of the marsh gas to meet the separation requirements of process specifications, a horizontal filter screen and a vertical filter screen are arranged in the tower, the marsh gas enters from the upper part of the device in a tangential mode under certain pressure, rotates under the action of centrifugal force, then sequentially passes through the horizontal filter screen and the vertical filter screen to promote the water vapor in the marsh gas to be separated from the marsh gas, and then water drops in the device flow downwards along the inner wall and are accumulated at the bottom of the device and are periodically discharged.

The carbon dioxide removing device removes carbon dioxide by using a lime water solution absorption method, and mainly utilizes carbon dioxide and a calcium hydroxide water solution to generate calcium carbonate precipitate so as to remove carbon dioxide in the biogas, and the purified products are calcium carbonate and water without causing secondary pollution.

The invention has the advantages that: the large and medium-sized biogas purification method uses a new desulfurization purification process, so that the biomass conversion energy is more fully utilized, and the method has important significance for changing the traditional energy production in China, utilizing clean and renewable energy sources such as biomass energy and the like and establishing a sustainable development energy system.

Drawings

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

In the figure, 1, a regulating tank, 2, a pretreatment device, 3, an anaerobic digester, 4, a post-treatment discharge tank, 5, a sludge storage tank, 6, a desulfurization device, 7, a dehydration device, 8, a decarbonization device, 9 and a storage device.

Detailed Description

A large and medium-sized biogas purification method mainly comprises a regulating tank 1, a pretreatment device 2, an anaerobic digester 3, a post-treatment discharge tank 4, a sludge storage tank 5, a desulphurization device 6, a dehydration device 7, a decarbonization device 8 and a storage device 9, and is characterized in that: the adjusting tank 1 is connected with the pretreatment device 2, the pretreatment device 2 is connected with the anaerobic digester 3, the anaerobic digester 3 is connected with the post-treatment discharge tank 4, the anaerobic digester 3 is connected with the sludge storage tank 5, the anaerobic digester 3 is connected with the desulfurization device 6, the desulfurization device 6 is connected with the dehydration device 7, the dehydration device 7 is connected with the decarbonization device 8, and the decarbonization device 8 is connected with the storage device 9.

The dehydration device 7 is characterized in that horizontal and vertical filter screens are arranged in the tower in order to ensure that gas-liquid two phases of the marsh gas meet the separation requirement of a process, when the marsh gas enters from the upper part of the device in a tangential mode under certain pressure, the marsh gas rotates under the action of centrifugal force and then sequentially passes through the horizontal filter screen and the vertical filter screen to promote the water vapor in the marsh gas to be separated from the marsh gas, and then water drops in the device flow downwards along the inner wall and are accumulated at the bottom of the device and are periodically discharged.

The carbon dioxide removing device 8 removes carbon dioxide by using a lime water solution absorption method, and mainly utilizes carbon dioxide and a calcium hydroxide water solution to generate calcium carbonate precipitate so as to remove carbon dioxide in the biogas, and the purified products are calcium carbonate and water without causing secondary pollution.

When the device works, the following process flows are included no matter the scale of the device is large or small: the method comprises the steps of raw material wastewater collection, pretreatment, digester methane tank, discharge aftertreatment, methane purification, storage, transmission and distribution, utilization and the like. After the biogas is discharged from the large and medium-sized anaerobic digesters, because the large and medium-sized biogas digesters usually adopt a high and medium-temperature fermentation process, the hydrogen sulfide and saturated water vapor contained in the biogas are much higher than those in small-sized ponds for rural households. Hydrogen sulfide inUnder the condition of water, the pipeline for conveying the marsh gas, the related marsh gas equipment and the like are corroded and the like, and the existence of hydrogen sulfide can influence (removal of) carbon dioxide, so that the desulfurization should be firstly carried out to remove saturated water, and the process requirement for further removing the carbon dioxide is also beneficial₂Sufficiently stable in solution. The electrode spacing was 3mm, 15% by mass of ferric chloride solution was used at 50 ℃ and the current density was 3000A/m²The typical working voltage range is 0.85-0.9V. In order to meet the requirement of the ferric oxide desulfurizer on humidity, the temperature of high-temperature and medium-temperature biogas should be properly reduced, and water vapor in the biogas is generally removed by adopting a gravity method.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.