Biogas-Natural Gas Mixed Gas System for Steam Boiler

Abstract

A methane and natural gas mixed gas system for a steam boiler comprises a first methane tank, a second methane tank, a mixed gas holder and the steam boiler. A water pressure chamber is arranged between the first methane tank and the second methane tank, a first gas outlet valve and a second gas outlet valve are arranged on gas outlet pipes of the first methane tank and the second methane tank respectively, the gas outlet pipes of the first methane tank and the second methane tank are both connected with a methane inlet pipe, and a booster pump and a first gas inlet control valve are arranged on the methane inlet pipe which is inserted into a lower water tank of the mixed gas holder. A second gas inlet control valve is arranged on a natural gas inlet pipe which is inserted into the lower water tank of the mixed gas holder, a blow-down pipe is arranged at the top of the mixed gas holder, and a mixed gas outlet pipe is led out from the lower water tank of the mixed gas holder to a fuel gas inlet of the steam boiler. The booster pump, the first gas inlet control valve and the second gas inlet control valve are connected with an automatic control device respectively. The methane and natural gas mixed gas system for the steam boiler has the advantages that methane and natural gas mixed gas can be used effectively, and operational normality of the steam boiler is guaranteed while renewable energy sources are used to a maximum extent.

Description

technical field [0001] The invention relates to a steam boiler gas system, in particular to a biogas-natural gas mixed gas system for a steam boiler. Background technique [0002] Boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy in fuel, electric energy, heat energy of high-temperature flue gas, etc. After conversion by the boiler, it outputs steam, high-temperature water or organic heat carrier with certain heat energy. . The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's life, and can also be converted into mechanical energy through a steam power device, or converted into electrical energy through a generator. [0003] Steam boilers generally have the following forms: [0004] Biogas boilers include biogas boiling water boilers, biogas hot water boilers, biogas heating boilers, biogas bath boilers and biogas steam boilers. Biog...

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Problems solved by technology

[0007] Coal-fired boiler refers to the coal that is burned as fuel. After the heat of coal is converted, steam or hot water is generated, but not all the heat is effectively converted, and some of the heat is consumed reactively, so there is an efficiency problem, generally larger The boiler efficiency is higher, between 60% and 80%

[0008] At present, the general fuel of steam boilers is fuel oil and gas. Because coal-fired boilers have a large amount of waste treatment and serious pollution, they are only suitable for large-scale enterprises and thermal power plants. For small and medium-sized enterprises or public institutions, gas or oil-fired steam boilers are used, and Generally, a single fuel is used, such as: natural gas gas boilers are designed to only use natural gas, biogas gas boilers only use biogas, however, in the real environment, natural gas resources are non-renewable energy, biogas is renewable energy, how to use natural gas reasonably And biogas, maximizing the use of renewable energy is a new topic before us, that is, to use biogas and natural gas as complementary fuel gas, to use biogas as much as possible without affecting the normal operation and output of boilers, and to use If the mixed gas is used for combustion, it is necessary to study the mixing device and mixing process to solve the above problems

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