CN111575071A

CN111575071A - Method for extracting methane from excrement

Info

Publication number: CN111575071A
Application number: CN202010349307.8A
Authority: CN
Inventors: 杨帆
Original assignee: Individual
Current assignee: Jilin Futaihang Environmental Technology Co.,Ltd.
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-08-25
Anticipated expiration: 2040-04-28
Also published as: CN111575071B

Abstract

The invention discloses a method for extracting methane from excrement, which comprises the following steps: injecting water with a preset volume into the excrement; after water injection is finished, evaporating the excrement at a preset temperature and then extracting to obtain methane gas with a first concentration; purifying the first-purity methane gas to obtain a second-concentration methane gas, wherein the second concentration is far greater than the first concentration; collecting the second concentration methane gas to produce compressed natural gas. The compressed natural gas is prepared by further purifying the generated methane gas to obtain the high-concentration methane gas, so that the prepared methane raw material is better, the high-concentration methane gas can fully meet the material combustion condition of the automobile internal combustion engine, the midway braking failure condition can not occur in the automobile braking process, the problem that in the prior art, the concentration of methane in the compressed natural gas is not high, and the compressed natural gas can not meet the material combustion condition of the automobile internal combustion engine, so that the automobile can not be braked is effectively solved.

Description

Method for extracting methane from excrement

Technical Field

The invention relates to the technical field of new energy development, in particular to a method for extracting methane from excrement.

Background

Biogas is a mixed gas and can be combusted. Biogas is a combustible gas produced by the anaerobic digestion of organic matter by microorganisms. The main component of the methane is methane, which is an ideal gas fuel, and the methane is combusted after being mixed with a proper amount of air. The heat generation of pure methane per cubic meter is 34000 kilojoules, and the heat generation of methane per cubic meter is about 20800 kilojoules and 23600 kilojoules. Namely, 1 cubic meter of methane can generate heat equivalent to that provided by 0.7 kilogram of anthracite after being completely combusted. Compared with other fuel gases, the fuel gas has better anti-explosion performance and is a good clean fuel. Natural gas extracted from the marsh gas can be directly combusted to be used as fuel of an internal combustion engine, a production substance chain is combustion gas, and surrounding resin is available biochemical gas such as natural methanol, formalin, carbon tetrachloride and the like.

Methane is a high-quality gas fuel, meets the material combustion condition of an automobile internal combustion engine, has the highest temperature of about 400 ℃ after complete combustion, has an ultralow combustion point, belongs to a combustible gas, and can completely meet the requirement of compressed natural gas combusted by the automobile engine in oxidized air.

Compressed Natural Gas (CNG) is natural gas that is pressurized and stored in a gaseous state in a container. It has the same composition as pipeline natural gas and has methane (CH4) as the main component. CNG can be used as a vehicle fuel and lng (liquefield dnaturongas) can be used to make CNG, such CNG fueled vehicles being called ngv (naturalgasgassvehicle). Liquefied Petroleum Gas (LPG) is often easily confused with LNG, and indeed they are clearly distinguished. The main substance chain of LPG consists of propane (over 95%), with a small amount of butane resin surrounding it, and is stored in a tank under a suitable controlled pressure in liquid form, which can be compressed, refrigerated and the like to form useful domestic combustion gases and fuels for internal combustion engines of vehicles. Compressed natural gas is an ideal vehicle alternative energy source, and the application technology of the compressed natural gas is mature day by year. The method has the characteristics of low cost, high benefit, no pollution, safe and convenient use and the like, and increasingly shows strong development potential. Natural gas filling stations are generally divided into three basic types, namely fast filling, normal (slow) filling and hybrid.

The power used by the conventional automobile is derived from gasoline and natural gas in an engine combustion part, for automobile power and energy, the petroleum and the natural gas are main supporting directions of the current automobile industry, the market is continuously developed along with airplanes, ships and large and small carrying tools, and for energy supply, the supply, utilization and development of the petroleum and the natural gas represent the embodiment of comprehensive strength of a country. The rising oil price brings more and more cost pressure to the transportation industry, especially to urban public transport. The urban public transport has the characteristics of large quantity of useful oil, incapability of randomly adjusting shift and incapability of randomly floating ticket price, so that the cost of enterprises is increased directly due to the rising of the oil price, and the cost cannot be transferred in a short time. The high oil price not only directly increases the vehicle using cost, but also raises the logistics cost of the whole society. Therefore, finding alternative energy sources for new finished fuels is once again a topic of interest.

The 'gas modification by oil' is mainly Liquefied Petroleum Gas (LPG), the price change of the LPG and the price of the LPG are carried out synchronously, the price difference between the oil price and the price of the LPG with the same heat value is not large, the 'gas modification by oil' is mainly aimed at improving the quality of the atmosphere, and therefore the 'gas modification by oil' work which is driven by lack of economic benefits is carried out slowly all the time. With the rising and rising of oil price, the price difference between oil and natural gas is increased, and a large amount of fuel cost can be saved by using the natural gas with relatively low price. The method has the advantages that the related legal environment of 'oil to gas' is perfected as soon as possible, the refitting standard of the existing vehicle is unified, the refitting cost bearing mode is innovated, the society is encouraged to manufacture, purchase and use the dual-fuel vehicle, the unified planning of gas filling stations is well done in all places, and the gas filling station system with reasonable distribution and convenient gas filling is built. When the natural gas fuel is popularized and used, people do not need to be bothered by rising of oil price. However, due to the fact that the concentration of methane in the compressed natural gas in the prior art is not high, the compressed natural gas cannot meet the material combustion condition of the internal combustion engine of the automobile, and therefore the vehicle cannot be braked, and the experience of a user is affected.

Disclosure of Invention

In order to solve the problems shown above, the method is based on subjecting the feces to a high-temperature thermal process to obtain methane gas, then further purifying the methane gas to obtain methane gas with higher concentration, and finally collecting the methane gas with higher concentration to produce the compressed natural gas.

A method for extracting methane from manure for use in powered combustion, comprising the steps of:

injecting water with a preset volume into the excrement;

after water injection is finished, evaporating the excrement at a preset temperature and then extracting to obtain methane gas with a first concentration;

purifying the first purity methane gas to obtain a second concentration methane gas, wherein the second concentration methane gas is far greater than the first concentration methane gas;

collecting the second concentration methane gas to produce compressed natural gas.

Preferably, before the injecting of the predetermined volume of water into the stool, the method further comprises:

subjecting the feces to a pretreatment comprising: uniformly stirring the volume of the excrement and the mass of the sodium hydroxide according to a fixed proportion;

and placing the pretreated excrement in a preset temperature range for a preset time.

Preferably, after the water injection is completed, the excrement is evaporated at a preset temperature and then extracted to obtain methane gas with a first concentration, and the method comprises the following steps:

filtering the excrement to filter impurities in the excrement;

transferring the filtered excrement into a closed container;

extracting oxygen in the closed container to enable the closed container to be in a vacuum state;

adding a fermenting microorganism into the closed container;

heating the closed container by using steam with a preset temperature to obtain non-pure methane, wherein the non-pure methane comprises carbon dioxide, methane and hydrogen sulfide;

removing hydrogen sulfide components in the impure biogas;

after removal of the hydrogen sulphide content, an extraction is performed in the impure biogas to obtain the first concentration of methane gas.

Preferably, the removing of the hydrogen sulfide component in the impure biogas comprises:

obtaining spherical particles or scrap-shaped metallic iron;

preparing ferric oxide by reacting the metallic iron with a stirred aqueous solution of a mono-or polycarboxylic acid and passing through an oxidizing agent;

obtaining a first percentage of the hydrogen sulfide content in the impure biogas;

a first component percentage based on the hydrogen sulfide; determining the mass of ferric oxide required for removing the hydrogen sulfide, and recording as the target mass of ferric oxide;

obtaining the ferric oxide with the target mass from the prepared ferric oxide, and putting the ferric oxide with the target mass into the non-pure biogas to remove hydrogen sulfide components in the non-pure biogas;

acquiring a second percentage of the hydrogen sulfide component in the non-pure biogas in real time in the process of removing the hydrogen sulfide component, and determining whether the second percentage is less than or equal to a preset percentage;

if so, performing primary drying treatment on the non-pure biogas from which the hydrogen sulfide component is removed;

otherwise, continuing to add the ferric oxide on the basis of the target mass of the ferric oxide until the second percentage of the hydrogen sulfide component in the non-pure biogas is less than or equal to the preset percentage.

Preferably, after the removing of the hydrogen sulfide component, the extracting in the impure biogas to obtain the first concentration of methane gas comprises:

adding calcium oxide to the impure biogas from which the hydrogen sulfide component is removed;

reacting the calcium oxide with the carbon dioxide in the impure methane from which the hydrogen sulfide component is removed to generate calcium carbonate, water and pure methane gas;

collecting and separating the generated calcium carbonate;

after the separation is finished, carrying out secondary drying treatment on the pure methane gas to obtain dry pure methane gas;

and calculating the first concentration of the pure methane gas, and collecting the pure methane gas with the first concentration as the methane gas with the first concentration after the calculation is finished.

Preferably, the purifying the first purity methane gas to obtain a second concentration methane gas, the second concentration being much greater than the first concentration, includes:

inputting the first purity methane gas into a preset purification machine;

defaulting the concentration in the preset purifying machine to a second concentration;

extracting other gas components in the first concentration of methane gas;

repeatedly adding the first concentration of methane gas to the preset purification machine while maintaining the default concentration at the second concentration until all of the first purity methane gas is purified to the second concentration of methane gas.

Preferably, the method further comprises:

after the second concentration methane gas is collected, heating the closed container to a normal temperature state;

collecting the treated excrement;

and carrying out dry distillation on the collected and processed excrement.

Preferably, the method further comprises:

and compressing the methane gas with the second concentration into a liquid form according to different requirements of users.

Preferably, when the pure methane gas is subjected to the second drying treatment, the pure methane gas is subjected to a gas washing device to obtain a dried pure methane gas; the gas washing equipment comprises a gas inlet pipeline, a gas washing tank and a gas outlet pipeline;

the gas inlet pipeline is used for transmitting the pure methane gas to a concentrated sulfuric acid drying agent in the scrubber tank;

the washing gas tank is filled with a concentrated sulfuric acid drying agent and is used for drying the pure methane gas;

and the gas outlet pipeline is used for conveying dry pure methane gas.

The gas inlet pipeline is provided with an induction control valve, and the induction control valve automatically controls the gas inlet speed of the pure methane gas according to the following formula;

in the above formula, v is the intake rate of the pure methane gas, σ is the molecular scattering cross section of the pure methane gas, T is the temperature in the scrubber, p is the pressure in the scrubber, k is the transmission coefficient of the pure methane gas, z is the intermolecular collision frequency of the pure methane gas, ρ is the density of the pure methane gas,

and the pure methane gas outlet rate is the pure methane gas outlet rate, lambda is the molecular free path of the pure methane gas, C is the pure methane gas concentration dried in the scrubber tank, and M is the pure methane gas molar mass.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:

FIG. 1 is a flow chart of the operation of a method for extracting methane from feces according to the present invention;

FIG. 2 is another flow chart of the process for extracting methane from feces according to the present invention;

fig. 3 is another working flow chart of the method for extracting methane from feces provided by the invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The 'gas modification by oil' is mainly Liquefied Petroleum Gas (LPG), the price change of the LPG and the price of the LPG are carried out synchronously, the price difference between the oil price and the price of the LPG with the same heat value is not large, the 'gas modification by oil' is mainly aimed at improving the quality of the atmosphere, and therefore the 'gas modification by oil' work which is driven by lack of economic benefits is carried out slowly all the time. With the rising and rising of oil price, the price difference between oil and natural gas is increased, and a large amount of fuel cost can be saved by using the natural gas with relatively low price. The method has the advantages that the related legal environment of 'oil to gas' is perfected as soon as possible, the refitting standard of the existing vehicle is unified, the refitting cost bearing mode is innovated, the society is encouraged to manufacture, purchase and use the dual-fuel vehicle, the unified planning of gas filling stations is well done in all places, and the gas filling station system with reasonable distribution and convenient gas filling is built. When the natural gas fuel is popularized and used, people do not need to be bothered by rising of oil price. However, due to the fact that the concentration of methane in the compressed natural gas in the prior art is not high, the compressed natural gas cannot meet the material combustion condition of the internal combustion engine of the automobile, and therefore the vehicle cannot be braked, and the experience of a user is affected. In order to solve the above problems, the present embodiment discloses a method for producing compressed natural gas by performing a high temperature thermal process on feces to obtain methane gas, further purifying the methane gas to obtain methane gas with a higher concentration, and finally collecting the methane gas with a higher concentration.

A method for extracting methane from manure, as shown in fig. 1, for supplying power for combustion, characterized by comprising the steps of:

s101, injecting water with a preset volume into excrement;

s102, after water injection is finished, evaporating the excrement at a preset temperature and then extracting to obtain methane gas with a first concentration;

step S103, purifying the methane gas with the first purity to obtain methane gas with a second concentration, wherein the second concentration is far greater than the first concentration;

step S104, collecting methane gas with a second concentration to produce compressed natural gas;

in this embodiment, a large amount of feces is obtained, the feces may be human feces or animal feces, then water with the same preset volume is injected into each feces, the preset volume may be 200ml, after the water injection is completed, the feces are heated at a preset temperature, and then biogas is generated, at this time, a plurality of gases are included in the biogas, such as carbon dioxide, hydrogen sulfide, and the like, and a first concentration of methane gas is obtained by extraction in the biogas, and then the first concentration of methane gas is purified to obtain a second concentration of methane gas, specifically, the first concentration may be 70%, the second concentration may be 95%, and after the second concentration of methane gas is obtained, a round face of compressed natural gas is obtained. And collecting and storing the second concentration methane gas to produce the compressed natural gas.

The working principle of the technical scheme is as follows: injecting water with a preset volume into the excrement; after water injection is finished, evaporating the excrement at a preset temperature and then extracting to obtain methane gas with a first concentration; purifying the first-purity methane gas to obtain a second-concentration methane gas, wherein the second concentration is far greater than the first concentration; collecting the second concentration methane gas to produce compressed natural gas.

The beneficial effects of the above technical scheme are: the compressed natural gas is prepared by further purifying the generated methane gas to obtain the high-concentration methane gas, so that the prepared methane raw material is better, the high-concentration methane gas can fully meet the material combustion condition of the automobile internal combustion engine, the midway braking incapability condition can not occur in the process of braking the automobile, the problem that the concentration of methane in the compressed natural gas is not high in the prior art is effectively solved, and the problem that the compressed natural gas cannot meet the material combustion condition of the automobile internal combustion engine so as to brake the automobile is solved, and the experience feeling of a user is greatly improved.

In one embodiment, before injecting the predetermined volume of water into the stool, the method further comprises:

pretreating the excrement, wherein the pretreatment comprises the following steps: stirring the volume of the excrement and the mass of the sodium hydroxide uniformly according to a fixed proportion;

placing the pretreated excrement in a preset temperature range for a preset time;

in this embodiment, the fixed ratio may be 100:5, the preset temperature range may be 10 ℃ to 25 ℃ after the feces and the sodium hydroxide are uniformly stirred, and the preset time period may be 10h to 15 h.

The beneficial effects of the above technical scheme are: because the excrement is acidic, the PH of the excrement is neutralized by using a sodium hydroxide solution, so that the PH of the excrement is maintained in a stable range, and because the excrement is collected to form a container, the operation can prevent the excrement from being acidic to corrode the container, the cost is saved to a certain extent, meanwhile, the PH most suitable for generating methane is 7.0-7.5, and the most basic condition for obtaining methane is ensured by neutralizing the PH of the excrement, namely, a good condition is provided for maximizing the methane production amount.

In one embodiment, after the water injection is completed, the feces is subjected to evaporation at a preset temperature and then extracted to obtain methane gas with a first concentration, and the method comprises the following steps:

filtering the excrement to filter impurities in the excrement;

transferring the filtered excrement into a closed container;

extracting oxygen in the closed container to make the closed container in a vacuum state;

adding fermentation microorganisms into the closed container;

removing hydrogen sulfide components in the non-pure methane;

after removing the hydrogen sulfide component, extracting in non-pure methane to obtain methane gas with a first concentration;

in this embodiment, at first through filtering excrement and urine, filter the impurity in the excrement and urine, filterable mode can be for using the filter screen to filter, then will filter excrement and urine unified transfer to a closed container in, for the efficiency of accelerating methane formation, it is best to utilize the metal container that heat conduction is fast, and the best metal material of current heat conductivity is copper, gold, aluminium. The first two are too high in cost, so that an aluminum alloy container is selected as a final closed container, after the closed container is determined, oxygen in the aluminum alloy container is extracted, the purpose is to avoid the reaction of the oxygen in the container and generated methane to generate carbon dioxide and water vapor, so that the concentration of the carbon dioxide is increased, and the concentration of the methane is reduced, after the oxygen extraction is finished, the methane gas is generated more quickly like adding fermentation microorganisms in the aluminum alloy container, after the methane gas is added, the aluminum alloy container is heated by high-temperature steam to obtain non-pure methane, the preset temperature can be 300 ℃, the generated non-pure methane contains various gases, the hydrogen sulfide gas in the non-pure methane is removed firstly, the hydrogen sulfide gas is combustible acidic gas under the standard condition, and is colorless, and has odor and toxicity when the concentration is low. The hydrogen sulfide is a flammable and dangerous chemical substance, can form an explosive mixture when being mixed with air, and can cause combustion and explosion when meeting open fire and high heat. Firstly removing hydrogen sulfide gas for improving safety, and finally extracting in impure methane after removing hydrogen sulfide gas to obtain methane gas with a first concentration.

The beneficial effects of the above technical scheme are: the method improves the rate of generating methane, further saves the cost, removes toxic and dangerous gas in the non-pure methane after obtaining the non-pure methane, and ensures the safety.

In one embodiment, removing the hydrogen sulfide component of the impure biogas comprises:

obtaining spherical particles or scrap-shaped metallic iron;

preparing ferric oxide by reacting metallic iron with a stirred aqueous solution of mono-or polycarboxylic acid and passing through an oxidizing agent;

obtaining a first percentage of hydrogen sulfide content in the impure biogas;

a first component percentage based on hydrogen sulfide; determining the mass of ferric oxide required for removing hydrogen sulfide, and recording as the target mass of ferric oxide;

obtaining ferric oxide with target mass from the prepared ferric oxide, and putting the ferric oxide with target mass into non-pure biogas to remove hydrogen sulfide components in the non-pure biogas;

otherwise, continuously adding ferric oxide on the basis of the ferric oxide with the target mass until the second percentage of the hydrogen sulfide component in the non-pure biogas is less than or equal to the preset percentage;

in this embodiment, spherical particles or scrap-shaped metallic iron is obtained in advance, the way of obtaining may be to collect scrap iron pieces in a waste iron tool, after obtaining the metallic iron, the metallic iron is reacted with a stirred aqueous solution of a mono-or polycarboxylic acid and an oxidant is used to prepare ferric oxide, the prepared ferric oxide is used to remove hydrogen sulfide gas in non-pure biogas, ferric hydroxide is produced by reacting ferric oxide with water, then ferric sulfide and water are produced by reacting ferric hydroxide with hydrogen sulfide, before removing hydrogen sulfide, a first percentage of hydrogen sulfide component in the non-pure biogas is counted in advance, then a required amount of ferric oxide is determined according to the percentage, then the ferric oxide after determining the amount is put into a closed container, hydrogen sulfide is removed by using ferric oxide, a second percentage of hydrogen sulfide component in the non-pure biogas is detected in real time during the process of removing hydrogen sulfide, when the second percentage of the hydrogen sulfide components is determined to be less than or equal to the preset percentage, the hydrogen sulfide is determined to be completely removed, the preset percentage is 0.1%, water vapor is generated after the hydrogen sulfide is removed, and methane is not beneficial to be extracted under the condition of water vapor, so that the non-pure methane is subjected to primary drying treatment to remove the water vapor, and the non-pure methane does not contain the components of the hydrogen sulfide gas after the water vapor is removed. Only the required methane gas needs to be extracted from the non-pure methane.

The beneficial effects of the above technical scheme are: because the ferric oxide is expensive, the ferric oxide is prepared by using the metallic iron, the ferric oxide prepared by the target quality is used for removing the hydrogen sulfide component in the non-pure biogas, a large amount of ferric oxide does not need to be purchased, the material waste can be avoided, and the cost is further saved.

In one embodiment, as shown in fig. 2, after removal of the hydrogen sulfide component, extraction is performed in a non-pure biogas to obtain a first concentration of methane gas, comprising:

step S201, adding calcium oxide into the impure methane with the hydrogen sulfide components removed;

step S202, calcium oxide is used for reacting with carbon dioxide in the non-pure biogas from which the hydrogen sulfide component is removed to generate calcium carbonate, water and pure methane gas;

step S203, collecting and separating the generated calcium carbonate;

step S204, after the separation is finished, carrying out secondary drying treatment on the pure methane gas to obtain dry pure methane gas;

step S205, calculating a first concentration of the pure methane gas, and collecting the pure methane gas with the first concentration as the first concentration methane gas after the calculation is completed.

The beneficial effects of the above technical scheme are: the carbon dioxide gas in the non-pure biogas can be removed, the pure methane gas is reserved, meanwhile, no other harmful gas is generated in the process of removing the carbon dioxide, and the concept of green environmental protection is met.

In one embodiment, purifying the first purity methane gas to obtain a second concentration of methane gas, the second concentration being substantially greater than the first concentration, comprises:

inputting the first purity methane gas into a preset purification machine;

defaulting the concentration in a preset purifying machine to be a second concentration;

extracting other gas components in the methane gas with the first concentration;

repeatedly adding the first concentration of methane gas to the preset purifying machine under the condition that the default concentration is maintained as the second concentration until all of the first purity methane gas is purified as the second concentration methane gas.

The beneficial effects of the above technical scheme are: the first concentration methane gas can be accurately purified to obtain the second concentration methane gas with higher concentration, the higher the concentration of methane is, and the compressed natural gas prepared by taking methane as a raw material can also enable the braking effect of the automobile to be better.

In one embodiment, as shown in fig. 3, the method further comprises:

s301, after the second-concentration methane gas is collected, heating the closed container to a normal-temperature state;

step S302, collecting the processed excrement;

and step S303, carrying out dry distillation on the collected and processed excrement.

In this embodiment, the extracted methane is isolated in vacuum, and the closed container is heated to normal temperature, so that the top of the separation space is pure methane and the bottom thereof is pure carbon dioxide, a thin middle zone is formed between the top and the bottom of the separation space, the flowing gas resin is a mixture of methane and carbon dioxide, and the complex high molecular organic substances in the excrement are converted into low molecular organic substances such as acetic acid, propionic acid and butyric acid, thereby providing and maintaining living conditions required by various microorganisms in biogas fermentation. The feces can be used as nutrient for crops after dry distillation.

The beneficial effects of the above technical scheme are: the living conditions of the fermentation microorganisms are ensured, and meanwhile, the excrement is effectively treated, so that the green environmental protection and the waste recycling are further realized.

In one embodiment, the method further comprises:

The beneficial effects of the above technical scheme are: the user can obtain the methane gas of liquid form or the methane gas of gaseous form according to self needs, diversified demand that has satisfied the user, further promotion user's experience sense.

In one embodiment, the method comprises the following steps:

1. injecting water with the same volume into the excrement, and purifying the extracted methane gas by using harmless gas under the action of high-temperature puffing, wherein the collected non-pure methane is multi-gas mixed gas, extracting methane and carbon dioxide from natural methane, performing early purification and collecting, and the synthetic gas substances generated by the generated gaseous substances are methane medium with the concentration of more than 70% and 95% ethane resin;

2. a large amount of methane and combustible methane gas can be generated through a thermal technology, excrement is collected, concentrated gas is cooled, filtered and compressed in a refrigerating mode, high-temperature puffing is carried out to screen and release the gas, solid-gas separation and gas collection processing are achieved, then all collected gas is uniformly concentrated, compressed and refrigerated, the methane can be combustible in the temperature range of 0-80 ℃, the methane is suitable for various types of methane with low temperature (20 ℃), medium temperature (30 ℃) and high temperature (50 ℃), and the optimum ignition temperature is 15 ℃, 35 ℃ and 53 ℃;

3. the method comprises the following steps that bacteria capable of generating methane in excrement belong to anaerobic biological substances, a small amount of oxygen can also seriously influence the growth and the propagation of the bacteria, a closed digestion tank capable of isolating oxygen is built in a treatment system, the temperature is an important factor in the anaerobic digestion process, the ignition point of methane can be reduced along with the reduction of the temperature after expanded gas is cooled, after the methane is cooled to be below 10 ℃, carbide in the methane can be naturally separated from the gas, and after the methane is cooled at low temperature, the gas in the internal space of the methane storage can be high-purity methane resin;

4. the method comprises the steps of setting gas separation, separating a methane gas cylinder from carbon dioxide by vacuum processing, separately sucking the methane gas cylinder and the carbon dioxide gas cylinder, discharging the carbon dioxide, wherein the generated gas is pure methane gas, a substance chain is of a single-substance structure, more than 25% of gas resin around the methane gas can be combustion-supporting gas resin with low ignition point, the gas extracted from the methane gas can directly extract methane with concentration of more than 70%, the methane can be combined with oxygen serving as combustion-supporting gas to generate natural gas for combustion, and the natural gas can be used for preparing CNG after being compressed, wherein the vehicle taking the CNG as fuel is named as NGV (NaturalGasVehicle) compressed natural gas is the most ideal vehicle alternative energy, the resin content of the internal combustible gas can reach more than 85%, the ignition point of the fuel is reduced, and the fuel is easy to combust;

5. the extracted methane is isolated in vacuum, the separation chamber is heated to normal temperature, so that the top of the separation space is pure methane and the bottom of the separation space is pure carbon dioxide, a thin middle zone is formed between the separation space and the pure methane and the bottom of the separation space, flowing gas resin is generated and is a mixture of methane and carbon dioxide, complex high molecular organic substances in the excrement are converted into low molecular organic substances such as acetic acid, propionic acid, butyric acid and the like, living conditions required by various microorganisms in biogas fermentation are provided and maintained, and the combined action of various combustible resins is realized through the fermentation decomposition effect.

In one embodiment, under the support of Jilin university and an environmental protection unit, 1000kg of excrement is collected in a sewage plant in the city of Changchun, all the excrement is subjected to small-scale separation experiments, all the excrement is firstly sent into all instruments in the experimental flow in batches without interruption, and is subjected to uninterrupted purification and assay, and effectiveness tests and experiments are carried out. According to the process of the invention, purification treatment and compression experiments are carried out on all night soil in batches in a small instrument melting furnace, then solid-liquid separation is carried out on the inflowing night soil, primary extraction and secondary extraction of high-purity combustion gas such as methane and the like are carried out on the night soil batch by batch, scientific collection and condensation compression are carried out on the extracted combustible gas, and in the experimental process, the night soil is monitored and tested in the whole processes of adding water, mixing, puffing, refrigerating and compressing and the like respectively by a system.

Through the whole system experiment, concentrated gas collection is carried out after each batch of excrement is treated, and chemical examination shows that 57.4L of concentrated methane gas is synthesized by compressing 1000kg of mixed excrement in gas processing through a processing technology except solid matter collection, and the high purity reaches 85-95% of flammability. In the requirement of ignition point, the combustion speed and the combustibility of the natural methane extracted by the invention reach 2.6 times of those of gasoline, and the effect of quickly realizing all combustion in a low-temperature environment can be completely achieved after the ambient temperature is reduced and the natural methane is solidified.

In another embodiment, in the starting process of a conventional gasoline engine, after gasoline needs to be sucked into the bottom layer of the internal combustion engine, the internal combustion engine rotates to generate temperature about 20 ℃, then flash combustion is generated after a spark plug rotates, controllable explosion is generated by increase of the utilization temperature in the internal combustion engine, the internal temperature of the internal combustion engine is instantly increased to a combustible temperature, the temperature of the inside of an oil tank of a vehicle body needs to meet the relative ignition point generated by the combustion temperature of the gasoline in the external environment, internal combustion can be performed on heat generated by gas, and under the condition of low temperature, after the automobile is heated firstly when the automobile is started, ignition and combustion can be performed after the temperature of the oil tank, the temperature of an air cylinder and the temperature of the engine are increased. If the methane gas is directly injected into the oil tank, the ignition temperature can be reduced, quick ignition can be generated at low temperature, and the methane gas can be fully combusted in the cylinder and the engine, so that the starting time of the internal combustion engine can be saved, the temperature of the internal combustion engine can be kept fully combusted for a long time, the oil consumption is saved, the vehicle loss can not be caused, the waste gas emission is reduced by 65-70%, the discharge capacity exceeds the national VI standard, and the ultra-low emission environmental protection standard is realized.

The method is characterized in that a gas power combustion and starting process experiment is carried out in an automobile with a steam popular express naturally aspirated 2.0L engine, methane gas is divided by four cylinders and then is respectively sent into the bottom layer of an internal combustion engine through an oil tank, the internal combustion engines in the four cylinders are simultaneously rotated and compressed, ignition combustion is carried out by using a spark plug, a lever in the internal combustion engine is rapidly rotated, the ambient temperature in the cylinder is about-15 ℃, the spark plug is used for igniting rising gas instantaneously, and instantaneous methane gas flash combustion in the internal combustion engine is realized. Utilize the cylinder internal gas to produce explosion and gas expansion after compression, ignition, combustion process, the controllability explosion inside the internal-combustion engine is produced to the increase temperature, improve the internal-combustion engine inside temperature to combustible temperature in the twinkling of an eye, the inside temperature under the external environment of automobile body oil tank, need accord with the produced relative ignition point of petrol combustion temperature, can carry out inside burning to the heat that the gas produced, under microthermal condition, the vehicle starts and needs to carry out the heat back to the car earlier, improve oil tank and cylinder and engine self temperature back and can strike sparks and burn. If the methane gas is directly injected into the oil tank, the ignition temperature can be reduced, quick ignition can be generated at low temperature, and the methane gas can be fully combusted in the cylinder and the engine, so that the start time of the internal combustion engine can be saved, the temperature of the internal combustion engine can be kept fully combusted for a long time, the oil consumption is saved, and the loss of vehicles can be avoided.

In one embodiment, when the pure methane gas is subjected to the second drying treatment, the pure methane gas is passed through a gas washing device to obtain a dried pure methane gas; the gas washing equipment comprises a gas inlet pipeline, a gas washing tank and a gas outlet pipeline;

and the gas outlet pipeline is used for conveying dry pure methane gas.

The beneficial effects of the above technical scheme are that: through above-mentioned technical scheme, set up the direct control of induction control valve in the intake pipe pure methane gas gets into the scrubbing tank with what rate and carries out the second drying process, can effectively avoid getting into in the scrubbing tank like this pure methane gas is surplus and leads to the drying process effect not good.

It will be understood by those skilled in the art that the first and second terms of the present invention refer to different stages of application.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for extracting methane from manure for use in powered combustion, comprising the steps of:

injecting water with a preset volume into the excrement;

2. The method for extracting methane from feces of claim 1, wherein prior to said injecting a predetermined volume of water into the feces, the method further comprises:

3. The method for extracting methane from excrement according to claim 1, wherein after the water injection is completed, the excrement is subjected to evaporation at a preset temperature and then extracted to obtain methane gas with a first concentration, and the method comprises the following steps:

filtering the excrement to filter impurities in the excrement;

transferring the filtered excrement into a closed container;

adding a fermenting microorganism into the closed container;

removing hydrogen sulfide components in the impure biogas;

4. The method for extracting methane from feces of claim 3, wherein the removing of the hydrogen sulfide component from the impure biogas comprises:

obtaining spherical particles or scrap-shaped metallic iron;

5. The method for extracting methane from feces according to claim 3, wherein the step of extracting in the impure biogas to obtain the first concentration of methane gas after the step of removing the hydrogen sulfide component comprises:

collecting and separating the generated calcium carbonate;

6. The method of claim 1, wherein the purifying the first purity methane gas to obtain a second concentration of methane gas, the second concentration being substantially greater than the first concentration, comprises:

inputting the first purity methane gas into a preset purification machine;

extracting other gas components in the first concentration of methane gas;

7. The method of extracting methane from feces of claim 3, further comprising:

collecting the treated excrement;

and carrying out dry distillation on the collected and processed excrement.

8. The method for extracting methane from feces of claim 1, further comprising:

9. The method for extracting methane from excrement according to claim 5, wherein when the pure methane gas is subjected to the second drying treatment, the pure methane gas is subjected to a gas washing device to obtain a dried pure methane gas; the gas washing equipment comprises a gas inlet pipeline, a gas washing tank and a gas outlet pipeline;

and the gas outlet pipeline is used for conveying dry pure methane gas.

10. The method for extracting methane from excrement according to claim 5, wherein the gas inlet pipeline is provided with an inductive control valve, and the inductive control valve automatically controls the gas inlet speed of the pure methane gas according to the following formula;