Introduction Hot blast stoves are essential heating equipment for grain drying. There are many types and different ways of distinguishing. Generally, the following classification methods are used: 1) Classification by fuel. There are solid fuel hot blast stove liquid fuel hot blast stoves and gas fuel hot blast stoves. (2) Classified by heating method. There is a hot blast stove in which the hot air furnace directly supplies the furnace gas to indirectly supply the furnace gas. (3) Classified according to the principle of combustion. There are layered hot blast stoves and suspension type hot blast stoves. (4) Classification according to the style of the furnace. Organic-fired hot blast stove and hand-fired hot blast stove. (5) Classified according to the structure of the furnace. There are horizontal hot blast stoves and vertical hot blast stoves. Classified according to the distribution of the grate. There are horizontal and inclined grate hot blast stoves. At present, due to some conditions, China generally uses solid fuel stoves. The author only explores the two types of furnaces, the vertical type furnace hot air stove (hereinafter referred to as the horizontal furnace) and the vertical hand-fired hot air furnace. The heat exchanger is directly mounted on the furnace body to form a whole. Because it is artificial coal and manual slag removal, in addition to the labor intensity of the furnace, the stability of heating is not as good as that of the horizontal machine. This is the main disadvantage of the hand furnace. The thermal efficiency is generally that the air supply form of the early vertical furnace is a negative pressure air supply. Since the furnace body is a metal structure, if there is a leak in use, the furnace gas is easily brought into the dryer and affects the drying quality. In recent years, Heilongjiang Agricultural Instrument Equipment Factory has developed a new type of LF series far-infrared vertical hot air furnace. The overall structure of the furnace is vertical, the upper part of the furnace body is made of metal structure, the heat exchanger pipe is built in, and the lower part of the furnace body (furnace) is refractory brick refractory concrete and ordinary concrete structure, and positive pressure is adopted. The air supply form completely overcomes the shortcomings caused by the early vertical furnace negative pressure air supply, and greatly improves the service life of the furnace, and is also convenient for user maintenance and maintenance. Horizontal furnace and vertical furnace structure features 1) Horizontal furnace heat supply is relatively large, generally using mechanical coal (chain or chain bucket), mechanical coal (chain grate or reciprocating grate) and machinery Deslagging (screw conveying or chain slag greatly improves the operating conditions and working environment of the furnace, and can improve the stability of heating. The thermal efficiency is generally one. The overall structure of the furnace is horizontal, mainly changed from the furnace chamber. The heat exchanger is mostly composed of a spiral conveying of a tubular slag removing machine or a chain slag discharging machine and a coal pulverizing machine, etc. Generally, the furnace body is separated from the heat exchanger, which is convenient for maintenance and management. However, there are also horizontal hot blast stoves to improve the utilization of heat radiation inside the furnace. The difference in performance between horizontal and vertical furnaces is characterized by the fact that the heating furnace is stable and the operating conditions are better. . At the same time, there are also deficiencies in the failure rate, maintenance difficulties and large maintenance. Vertical furnaces have problems such as unstable heating and poor operating conditions. However, it is also widely used due to its low failure rate and long service life. For example, the drying equipment of grain storage in Jiayin Farm, Heilongjiang Province, Heilongjiang Province uses vertical hot air stoves. Analytical investment costs for other aspects of horizontal and vertical furnaces. Because the horizontal furnace body uses a large number of refractory brick shaped refractory brick red brick masonry, plus a metal structure heavier chain grate and a metal structure of multiple sets of heat exchangers, etc., a large area, on the boiler room The requirements for supporting civil works are also high, so the investment in horizontal furnaces is twice as large as that in vertical furnaces. Installation and construction. The horizontal furnace has a long construction period due to the large amount of masonry and installation on the site. According to the size of the furnace. Maintenance and management. Because of the large floor space and the large number of supporting equipment, horizontal furnaces also have inconveniences in maintenance and management. For example, the maintenance of the chain grate, the maintenance of the coal machine, especially the slag machine, should be promptly eliminated. The vertical furnace only needs to maintain the drying cycle of the furnace pipe once, which is relatively easy. In addition, in view of the insufficiency of the vertical furnace heating stability, some users have worked hard on management and developed appropriate operating methods and management methods. The library adopts four quick operation methods of quick opening and quick addition of quick slag quick closing door, and the two furnaces are alternately operated, which overcomes the shortcomings of poor stability of vertical furnace heating, thereby greatly improving the heating productivity and achieving The obvious effect not only ensures the quality of the corn after baking, but also increases the yield. Hot blast stoves need to improve several problems with horizontal furnaces, seeking new refractory materials and masonry processes. For example, changing the on-site masonry to the prefabrication in the factory, on-site installation, can reduce on-site construction and shorten the construction period. Improve the material or structure of the tubes in the first group of heat exchangers, and extend the service life of the tubes, thus extending the service life of the entire furnace. To reduce the failure rate of the chain grate and the slag removal machine, especially the screw conveyor slag removal machine, it is also possible to consider the development of other new slag removal equipment. The vertical furnace should completely solve the problem of unstable heating of the furnace. The main reason is that the furnace door is often opened and closed when the artificial slag is manually removed, which causes the temperature in the furnace to drop repeatedly. At present, this type of furnace has not been solved in China. The key to this problem is how to open or lower the furnace door in the normal combustion of the furnace (additional coal) and slag removal (cleaning ash). In this way, the vertical furnace structure can be kept compact and easy to install and maintain, and the disadvantages of the original vertical furnace can be solved. Improve the flue gas direction of the vertical furnace, add a settling chamber in the flue to solve the problem of more particles in the flue gas and damage the smoke generating device. An inspection port is added to the bottom of the vertical furnace, which can regularly remove the soot fouling of the smoke chamber and the smoke pipe, and improve the heating condition to prolong the service life. In summary, regardless of the horizontal furnace or the vertical furnace or other types of hot blast stoves, the manufacturer and the user must improve the service life of their own equipment. At the same time, efforts should be made to reduce investment, reduce production costs, and strengthen management. Only in this way can they be competitive in the market. The construction of the base must have a certain radiation surface, and the combination of the main points and the main body of the surface can achieve the effect of leading the farmers to increase their income. It is necessary to strengthen the business training of agricultural machinery extension personnel, conduct knowledge utilization demonstration belts and demonstration bases, and hold live demonstrations. Update to improve the quality of the promotion staff. In the form of on-site demonstrations, new tools and new technologies will be introduced to farmers in the construction of demonstration parks, innovation will be carried out in the promotion of agricultural machinery, and farmers' skills will be improved and their decision-making ability will be enhanced. It is necessary to give play to the demonstration role of demonstration demonstration and demonstration of the combination of agricultural machinery and agronomy in the construction of demonstration zone in the demonstration zone, mobilize farmers to adopt the new technical cooperation requirements of agricultural machinery, and choose innovative and well-operated cost-effective synergies. Enthusiasm and creativity, and effectively promote the promotion of agricultural machinery technology in the city with obvious technical content. We will establish an ambitious goal of rapidly developing the agricultural machinery industry and ensuring the realization of prosperity and prosperity. Electric Patient Lift,Patient Lift Hoist,Electric Mobile Patient Lift,Electric Sit To Stand Lift Jiangmen Jia Mei Medical Products Co.,Ltd. , https://www.jiamei-medical.com
Advantages and disadvantages of solid fuel stoves