【文章內(nèi)容簡介】 sources. A large amount of weakly caking coal, up to 40% of anthracite, or 50~60% of lean coal can be blended with the coking coal. Such method leads to rational utilization of coal resources and reduces the coking cost. The coke is big in size and strong in strength. The investment is low and construction period is short. According to present market situation, the investment, including power generation by waste heat, is about 40% of that for traditional coke oven of the same capacity, and the construction period is 11 months. Power consumption is low and production process is simple. The operation is simple and convenient. For example, during the production no power like steam and low temperature water is consumed. There are less production process control points, which facilitates the . realization of automatically control and adjustment through puter. Technical Specifications of Coke ovens The refractories used for this type of coke oven are mainly silica bricks. Headers are provided on two sides of the oven body over the oven column. These types are mainly used to produce metallurgical coke. Carbonization Chamber Height 2834mm Carbonization Chamber Length 13340mm Carbonization Chamber Width (avg.) 3596mm Carbonization Chamber Central Distance 4292mm Dry Coal Charged One Time 45tons Density of Briquette into the Oven ~Operation Period 66~68hrs 4. Technological Process Description Coal Preparing Coal is transported to coking plant by Jetty belt conveyor and piled up on coal yard by different grades. The area of coal yard is approximate 40000m2. Four coal receiving pits are provided in the cleaned coal yard. After pushed into the coal receiving pits by bulldozers or loading machines, coal is fed onto the belt conveyor through coal charging machine, and then conveyed to the toplevel belt conveyor of coal blending bunker. Afterwards the coal is unloaded by discharging machine to the appointed coal blending bunker awaiting blend. There are five coal blending bunkers with a whole capacity of 2300tons. The lining of the bunkers are made of plastic materials. Electric belt scales are provided under the bunkers to Coal blend is transported by selected coal belt conveyor into PFCK reversible counter hammering pulverizer and ground with 90~92% reaching the qualified grain size of less than 3mm. The moisture of the coal blend should be at 10% or so. If the moisture is not reached, water should be added. The qualified coal blend is again fed by the selected coal belt conveyor into the coal tower and stored there for coking. A bination of electric interlock central control and local control is . adopted in this system. Electric elements are dustproof, dampproof and explosionproof. A sampling instrument is located at the end of the belt conveyor ahead of the pulverizer to take samples of coal blend for analysis. There also located an electromagic Fe remover against the impurity in the coal blend. Mechanical dust remover is also provided. Coal Blending Industrial Test Coal of different grades will be provided by Indian side. After working out four to five schemes of coal blending, our side will conduct industrial test, in one of the mercial coking plants designed by us. Upon analysis and parison the results in coke quality, coal cost and reasonable utility of resources, we will provide detailed test report for coal blending and coking. Coking The eligible coal blend from the coal preparing workshop section is delivered to coal tower under which situated the stamping station. Hydraulic stamping method is used. One coal cake contains two layers, incurring about 20 minutes’ stamping time. When charging time es, coal blend directly falls into the skipper through a hopper outlet, containing half weight of a coal cake. A fluid driven flashboard valve and hydraulic cylinder driven chute provided beneath the skipper evenly discharge the coal blend into the stamp charging box where the coal blend is stamp charged to coal cake sized 12750x3400x1000mm with bulk density of ~ m3. The coal capacity is 45 metric tons. Coal box holding well stamp charged coal cake is loaded into coal charging car and transported to the oven where the coke is ready. Coal pushing car pushes out the coke in the carbonization chamber and immediately closes the cokeside oven door. The coal cake together with the charging plate is pushed into the carbonization chamber and the baffle on the coal cake end is locked on the oven door. The pushing car draws the charging plate out and immediately closes the machineside oven door. Owning to the heat cumulated in the fire channels of the sidewall and bottom of the oven, the coking coal is heated and raw gas is separated out. Adjustable suction valves on the oven roof and oven doors allow the introduction of primary air to bust with raw gas. The temperature of the space in oven roof is thus increased and coal cake is heated up through heat exchange and radiation. Due to the inadequacy of air through suction valves, the reductive gas in the ro