The invention discloses a method for separation production of biomass natural gas from marsh gas with high hydrogen sulfide content. The method is characterized by comprising the steps of biological desulfurization, chemical desulfurization and decarbonization. The invention further discloses a device for the separation production of biomass natural gas from the marsh gas with high hydrogen sulfide content. The device is characterized in that a sulfur melting kettle comprises a sulfur melting kettle body, a water vapor inlet pipe is connected to the side wall of the sulfur melting kettle body, the bottom of the sulfur melting kettle body is connected with a water vapor outlet pipe and a sulfur discharge pipe, a vapor jacket is arranged on the sulfur discharge pipe and is respectively connected with the water vapor inlet pipe and the water vapor outlet pipe; and a marsh gas and natural gas emergency evacuation protection device comprises a low-pressure flash drum, the low-pressure flash drum is connected with a valve a and a valve b, the valve a and the valve b are both connected with a linkage device, the valve a is further connected with a carbon dioxide purification device, and the valve b is further connected with the bottom of an emptying pipe. The invention has the advantages of high purification degree, high automation degree, convenience in operation and maintenance, low energy consumption and small occupied area.

Method and device for separation production of biomass natural gas from marsh gas with high hydrogen sulfide content

The invention provides a method for producing calcium carbonate during marsh gas purification. The method comprises the following steps of: introducing marsh gas into a calcium hydroxide solution at the flow speed 200-240 m /h; controlling the reaction pressure at 1.2-1.8 MPa; reacting to generate calcium carbonate and calcium sulfide; filtering to obtain calcium carbonate and calcium sulfide filter cakes and filtrates; and washing the filtrates, drying and smashing to obtain a calcium carbonate product. The filtrates can be recycled by replenishing calcium hydroxide. The method is easy to operate, and is convenient to popularize and apply; and moreover, by adopting the method, carbon dioxide and hydrogen sulfide impurities contained in marsh gas are absorbed effectively, the purity and quality of the marsh gas are improved, waste is changed into valuable, a calcium carbonate product with high economic benefit is obtained, and the potential economic value of marsh gas is developed effectively.

Method for producing calcium carbonate during marsh gas purification

The invention provides a method for purifying byproducts of soda ash and sodium sulphide by utilizing methane. The method comprises the following steps of: introducing methane into sodium hydroxide solution at a flow rate of 200-240m /h, controlling reaction pressure to be 1.2-1.8MPa, reacting to generate calcium carbonate and calcium sulphide, filtering to obtain sodium carbonate and sodium sulphide filtrates, and carrying out reduced-pressure distillation to obtain the soda ash and sodium sulphide products. The method provided by the invention is simple to operate and is convenient to popularize and apply, and carbon dioxide and hydrogen sulphide impurities which are contained in methane are effectively absorbed, thus purity and quality of methane are improved; and meanwhile, waste materials are changed into things of value, sodium carbonate and sodium sulphide products with higher economic benefit are obtained, and potential economic value of methane is effectively developed.

Method for purifying byproducts of soda ash and sodium sulphide by utilizing methane

The invention relates to a simple desulphurization method for natural gas self-used in a well site; under the condition that a natural gas flow velocity is determined, a concentration of a NaOH aqueous solution is adjusted according to the gas consumption of natural gas to be treated; thus the using amount of the NaOH aqueous solution is reduced, and H2S and CO2 in the natural gas is removed to reach minimum contents; the desulphurization tank is a vertical tank which is hollow in the inside and is provided with no coil pipes inside; a gas inlet is disposed at one side of the desulphurization tank, and a gas outlet is disposed at the top; an alkali liquor inlet is disposed at the upper part of the opposite side of the desulphurization tank to the gas inlet, and a side liquid discharge port is disposed at the lower part; a liquid discharge port is also disposed at the bottom of the tank; the liquid discharge ports of the desulphurization tank are connected with a well site sewage pool through pipelines; after deposition, sewage in the sewage pool is re-injected into a sewage well through a plunger pump. The high danger for alkali liquor addition is reduced, and the security is improved; meanwhile, the using amount of the alkali liquor is decreased, and the desulphurization cost is saved; the desulphurization is more thorough; gas feed quality is guaranteed; and environment pollution is avoided.

Simple desulphurization method for natural gas self-used in well site

The invention discloses a biological fermentation tank for collecting and utilizing methane. The biological fermentation tank for collecting and utilizing the methane comprises a fermentation tank body and a gas outlet; the gas outlet is connected with a methane collecting device through a conduit; the methane collecting device is composed of a copper sulfate solution containing tank; the copper sulfate solution containing tank is connected with a methane compressor through a conduit; the conduit between the copper sulfate solution containing tank and the methane compressor is connected with a carbon dioxide absorber; and the methane compressor is connected with a methane collecting bottle through a conduit. The biological fermentation tank can regather hydrogen sulfide gas and carbon dioxide gas produced in methane gas in the biological fermentation tank after impurities are removed from the hydrogen sulfide gas and the carbon dioxide gas and improves the purity of the methane without influencing use of the methane.

Biological fermentation tank for collecting and utilizing methane

The utility model discloses a multifunctional marsh gas decontaminating apparatus. A marsh gas collecting device is added with caustic soda solution which occupies 50 to 70 percent of the cubage of the collecting device, an air inlet pipe of the collecting device after being prolonged is penetrated into the caustic soda solution. The aqueous solution of sulfureted hydrogen is a weak acid which can generate sodium sulfide and water after a chemical reaction with sodium hydroxide, carbon dioxide reacts with the sodium hydroxide to generate sodium carbonate and water, in addition, vapor in the marsh gas becomes liquid water in the aqueous solution, thereby playing the role of dehydration of the collecting device. The multifunctional marsh gas decontaminating apparatus improves the existing collecting device, is integrated with a plurality of functions such as desulfation, dehydration, and decarbonation into a whole, and has the characteristics of less investment, simple installation, safe use and operation, convenient management, etc.

Yechuan Zhang

Papers

Multifunctional methane purifier