Method for supplementing biogas by virtue of liquefied natural gas (LNG) blended with air

A technology of liquefied natural gas and air blending, which is applied in the fields of gas fuel, petroleum industry, fuel, etc., can solve the problems of inability to supply on demand and reduction of biogas production.

Active Publication Date: 2014-11-26
湖南佳创能源工程设计研究院有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing small and medium-sized biogas projects in rural areas due to the decrease in winter temperature, the reduction of biogas production, and the inability to supply on demand, and to provide a method for supplementing biogas with liquefied natural gas mixed with air. This method uses conventional energy to mix air , and biogas under the condition of meeting the interchangeability, mix the mixed gas with biogas in any proportion and supply it to the residents

Method used

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  • Method for supplementing biogas by virtue of liquefied natural gas (LNG) blended with air
  • Method for supplementing biogas by virtue of liquefied natural gas (LNG) blended with air
  • Method for supplementing biogas by virtue of liquefied natural gas (LNG) blended with air

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Effect test

Embodiment 1

[0022] Example 1 Interchangeability analysis of conventional gas mixed with air and biogas

[0023] Biogas burners are designed with biogas as the reference gas, and when using another gas with different components, the fluctuation of combustion conditions is within the allowable range, then this gas is said to be interchangeable with the reference gas. The fluctuation of gas components must meet the requirements of interchangeability. In my country, the Wobbe number and the variation range of combustion potential are used to judge whether the requirements of interchangeability are met.

[0024] 1. The nature of the reference gas

[0025] The 6T gas in "Corporate Gas Classification and Basic Characteristics" GBT13611-2006 represents biogas as the reference gas for interchangeability analysis, and this specification stipulates the Wobbe number and combustion potential range of 6T gas, as shown in the following table:

[0026] Table 16T Gas Properties

[0027]

[0028] 2. M...

Embodiment 2

[0069] When the temperature is high in summer, the gas production rate of the fermentation tank is high. The biogas produced is purified by dehydration tower, desulfurizer and filter. Under the pressure, the second one-way valve is opened, and the biogas enters the wet gas storage tank. When the liquid level detector detects that the volume of biogas in the wet gas storage tank is greater than 90% of the volume of the wet gas storage tank, the liquid level signal is sent to the mixer control panel, and the mixer control panel sends an instruction to close the solenoid valve, and the natural gas does not enter Negative pressure is generated in the injection mixer, and the first one-way valve is naturally closed. The biogas in the wet gas storage tank is used as the gas source alone, and it is input into the pipeline network, and after the pressure is adjusted to 2200-3000Pa by the second pressure regulator, it is used by the user.

Embodiment 3

[0071] In spring and autumn, the temperature is low, the gas production rate of the fermentation tank is low, the biogas volume of the wet gas storage tank is insufficient, and when the gas volume in the wet gas storage tank is less than 30% of the total volume, the liquid level detector will send an unlocking signal to the mixing Open the solenoid valve on the gasified natural gas pipeline. The liquefied natural gas in the LNG cylinder group is gasified by the gasifier and enters the filter to be separated into gas phase natural gas and liquid phase natural gas. The gas phase natural gas enters the first gas phase through the opened solenoid valve. After the pressure regulator is adjusted to 0.4MPa, the gas phase natural gas enters the ejector mixer under the pressure, and is ejected at a high speed through a supersonic nozzle, and a negative pressure is formed in the suction chamber, and natural air from the outside is introduced. Natural gas forms a uniform mixed gas output....

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Abstract

The invention relates to a method for supplementing biogas by virtue of liquefied natural gas (LNG) blended with air. The method comprises the following steps: storing the biogas produced by a fermentation tank into a wet type gas storage tank after carrying out dehydration, desulfuration and impurity removal onto the biogas; feeding a monitored signal back to a mixer control plate and switching on a solenoid valve when a liquid level detector monitors that the volume of a fuel gas in the wet type gas storage tank is lower than or equal to 30% of the total capacity of the wet type gas storage tank; gasifying LNG in an LNG steel cylinder set by virtue of a gasifier, then conveying the gasified LNG into a filter so as to separate into the gas-phase natural gas and the liquid-phase natural gas, and conveying the gas-phase natural gas subjected to pressure adjustment into an ejection mixer to blend with the air; and supplementing the biogas supply. By virtue of the method, the biogas can be stably and continuously supplied throughout the year, and thus normalized and standardized supply of rural clean energy is realized.

Description

technical field [0001] The invention relates to a method for supplementing biogas by mixing liquefied natural gas with air, and belongs to the technical field of new energy. Background technique [0002] After the West-East Gas Pipeline Project was completed and put into operation, China's gas industry has entered a stage of rapid development. Natural gas consumption has continued to grow. The construction of natural gas pipeline networks that undertake the heavy responsibility of natural gas transportation and distribution is in high-level operation, and the gas penetration rate has increased year by year. However, in remote areas far from gas sources, farmers have not enjoyed the convenience brought by this clean energy. Due to the difficulty of pipeline construction and the long payback period, farmers are still using polluting fuels such as coal and straw, which is contrary to the national call for "energy saving and emission reduction". [0003] In order to supply clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 黄小美周阳张婧文凯
Owner 湖南佳创能源工程设计研究院有限公司
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