At present, the most widely used fields of biomass gasification in China are centralized gas supply and small and medium-sized gasification power generation, and a small amount is used for industrial boiler heating. The rural centralized gas supply project solves the problems of crop straw burning and cooking energy consumption, while biomass gasification power generation is mainly aimed at industrial enterprises such as wood processing plants and rice mills with a large amount of biomass waste. Straw gasification in China is mainly used for heating, gas supply, power generation and chemical synthesis.

（1）秸秆气化供热。秸秆气化供热是指秸秆经过气化炉气化后，生成的燃气送人下一级燃烧器中燃烧，为终端用户提供热能。秸秆气化供热技术广泛应用于区域供热和木材、谷物等农副产品的烘干等，与常规木材烘干技术相比具有升温快、火力强、干燥质量好的优点，并能缩短烘干周期，降低成本。

(1) Straw gasification heating. Straw gasification heating refers to that the gas generated after straw gasification in the gasifier is sent to the next burner for combustion to provide heat energy for end users. Straw gasification heating technology is widely used in regional heating and drying of agricultural and sideline products such as wood and grain. Compared with conventional wood drying technology, it has the advantages of fast heating, strong firepower and good drying quality, and can shorten drying cycle and reduce costs.

（2）秸秆气化供气。秸秆气化供气是指气化炉产生的生物质燃气通过相应的配套设备为居民提供炊事用气。秸秆气化供气又分为集中供气和单独供气两种类型。

(2) Straw gasification gas supply. Straw gasification gas supply means that the biomass gas produced by the gasifier provides cooking gas for residents through corresponding supporting equipment. Straw gasification gas supply can be divided into centralized gas supply and separate gas supply.

①秸秆气化集中供气。生物质气化集中供气系统是20世纪90年代以来在我国发展起来的一项新的生物质能源利用技术。它是在农村的一个村或组建立一个生物质气化站，将生物质经气化炉气化后转变成燃气，通过输气管网输送和分配到用户，系统规模一般为数十户数百户。目前，我国已广泛推广利用生物质气化技术建设集中供气系统，以满足农村居民炊事和采暖用气。

① Straw gasification and centralized gas supply. Biomass gasification centralized gas supply system is a new biomass energy utilization technology developed in China since the 1990s. It is to set up a biomass gasification station in a village or group in the countryside, convert the biomass into gas after gasification in the gasifier, and transmit and distribute it to users through the gas transmission network. The system scale is generally from tens to hundreds of households. At present, China has widely promoted the use of biomass gasification technology to build a centralized gas supply system to meet the needs of rural residents for cooking and heating.

在秸秆气化集中供气系统中，气化炉的选用是根据不同的用气规模来确定的，如果供气户数较少，选用固定床气化炉；如果供气户数多（一般多于1 000户），则使用流化床气化炉更好。秸秆燃气的炉具与普通的城市煤气炉具有所区别，国内此类炉具的生产厂家也较多，效果也较好，可以满足用户要求。

In the straw gasification centralized gas supply system, the selection of gasifier is determined according to different gas consumption scale. If the number of gas supply households is small, fixed bed gasifier is selected; If there are many gas supply households (generally more than 1000 households), it is better to use fluidized bed gasifiers. Straw gas stoves are different from ordinary urban gas stoves. There are many domestic manufacturers of such stoves, and the effect is also good, which can meet user requirements.

②户用秸秆气化供气。该种方式为一家一户的农村居民使用，户用小型秸秆气化炉，产生的燃气直接接人炉灶使用，系统具有体积小、投资少的优点。但也有显著的缺点：由于气化炉与灶直接相连，生物质燃气未得到任何净化处理，因而灶具上连接管及气化炉都有焦油渗出，卫生很差，且易堵塞连接管及灶具；因气化炉较小，气化条件不易控制，产出气体中可燃气成分质量不稳，并且不连续，影响燃用，甚有问题；从点火产气需要有一定的启动时间，增加了劳动时间，而且该段时间内烟气排放也是个问题。

② Household straw gasification gas supply. This method is used by rural residents from household to household. The household uses a small straw gasifier, and the gas generated is directly used by the stove. The system has the advantages of small size and low investment. However, there are also obvious disadvantages: because the gasifier is directly connected to the stove, the biomass gas has not been purified, so tar seeps from the connecting pipe and the gasifier on the stove, which is very poor in sanitation, and is easy to block the connecting pipe and the stove; Because the gasifier is small, the gasification conditions are not easy to control, and the quality of combustible gas components in the produced gas is unstable and discontinuous, which affects the combustion and even has safety problems; It takes a certain starting time from ignition to gas production, which increases labor time, and flue gas emission during this period is also a problem.

③秸秆气化发电。我国在生物质气化方面有一定的基础。早在20世纪60年代初就开展了这方面的研究工作，近20年来加快了生物质气化发电技术的进一步研究，开发的中小规模气化发电系统具有投资少、原料适应性和规模灵活性好等特点，已研制成功的中小型生物质气化发电设备功率从几千瓦到5 000千瓦。

③ Straw gasification for power generation. China has a certain foundation in biomass gasification. As early as the early 1960s, the research work in this field was carried out. In the past 20 years, the further research of biomass gasification power generation technology has been accelerated. The developed small-scale gasification power generation system has the characteristics of low investment, good raw material adaptability and scale flexibility. The power of the successfully developed small-scale biomass gasification power generation equipment has ranged from several thousand watts to 5000 kilowatts.

气化炉的结构有层式下吸式、开心式、下吸式和常压循环流化床气化炉等，采用单燃料气体内燃机和双燃料内燃机，单机大功率已达500千瓦。

The structure of gasifier includes layered down-suction gasifier, open-center gasifier, down-suction gasifier and atmospheric circulating fluidized bed gasifier. The single-fuel gas internal combustion engine and dual-fuel internal combustion engine are adopted, and the maximum power of single unit has reached 500 kW.

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