Modified HCNG fuel preparation method and preparation system

Abstract

The invention discloses a preparation method and a preparation system of modified HCNG fuel. The preparation system comprises the following steps: producing hydrogen; producing biogas; purifying the biogas; producing clean methane; and mixing the produced hydrogen with the extracted clean methane in proportion; the preparation system comprises a hydrogen production device, a biogas production device, a biogas purification device and a fuel production device; the biogas production device is used for preparing the biogas from crop straws; the biogas purification device is used for extracting methane from the biogas; the fuel production device is used for preparing the modified HCNG fuel from produced hydrogen and the extracted methane; the hydrogen production device is communicated with the fuel production device through a hydrogen exhaust pipe; the biogas production device is communicated with the biogas extraction device through a biogas exhaust pipe; the biogas purification device is communicated with the fuel production device with a methane exhaust pipe. The fuel mixed gas prepared by the preparation method of the modified HCNG fuel is high in combustion rate; the combustion performance and emission performance of an engine can be improved; exhausting of greenhouse gases is effectively lowered; the preparation system is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the technical field of clean fuel preparation, in particular to a method and system for preparing modified HCNG fuel. Background technique [0002] In the existing technology, the cost of transmitting electricity to remote areas is very high, and it is very vulnerable to the impact of climate. my country is an energy-deficient country, but there are vast rural areas, with an annual output of about 700 million tons of crop straw. In addition to industrial associated gas, green plant crops in mountains and lakes, the annual output of plant straw is more than 1 billion tons, but in remote areas, a large number of crop straws are used for cooking or heating. In view of this situation, the existing patented technology ZL201320540192.6 process crop stalks to generate biogas, and then purify the biogas to meet the standard of pure methane. Since methane has a slow flame propagation rate when it is lean-burning, this patented technology ...

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Problems solved by technology

[0002] In the existing technology, the cost of transmitting electricity to remote areas is very high, and it is very vulnerable to the impact of climate. my country is an energy-deficient country, but there are vast rural areas, with an annual output of about 700 million tons of crop straw. In addition to industrial associated gas, green plant crops in mountains and lakes, the annual output of plant straw is more than 1 billion tons, but in remote areas, a large number of crop straws are used for cooking or heating. In view of this situation, the existing patented technology ZL201320540192.6 process crop stalks to generate biogas, and then purify the biogas to meet the standard of pure methane. Since methane has a slow flame propagation rate when it is lean-burning, this patented technology (to produce methane) is used for methane engines There are problems such as low engine thermal efficiency and high unburned hydrocarbon emissions at low loads

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