Show pulverized COAL UNIT SYSTEM with tb the e many recent mechanical improvements in the industrial du world we have but to consider the rapid strides that have been made along the line of b generating steam by means of pulverized coal and especially the unit system the layton sugar co layton utah recently purchased from the erie city iron works erie pa through the stratton cahoon co engineers salt lake city and local representatives a complete pulverized coal installation including coal handling apparatus this installation consists of three elevators and bins for handling the coal from stock piles to the three magnetic separators over which all of the coal passes for the removal of tramp iron and six erie city iron works coal veri of 2000 pounds capacity each per hour each is operated from the main line shaft erie city iron works coal unit system through lea a silent chain drive the power being furnished by a alo lentz valve engine operating at r p in on n a 12 to 18 pound back pressure the exhaust steam there cronl orn is utilized in the reduction of sugar juice juices s in the factory proper 1 opel each delivers the powdered product into stion chamber without grates or other internal previous ous to making this installation tile the PI plant ant was I 1 hand fi red and within the boiler room shift required sd five men per vhf chile with the pulverized coal equipment only two men inen are ren tt with the future addition of an ash handling device thi labor item will be further reduced fuel the cheapest grade of unscreened slack is used in I 1 fact a grade of coal that could not otherwise be utilized even at the present time thousands of tons of this grade of slack is being discarded at the mines as in an product pio duct with the previous hand firing 6 method six boilers were operated while with the use of erie city col boj 11 four boilers ra 17 C mm U 14 closed side elevation interior blew carry the the load and in addition furnish steam for the lentz engine pulverized coal as fuel the most important factors in the production of heat by the combustion of fuel consists in obtaining 6 the latter of proper q quantity 1 i antiey and quality and in devising 6 methods of consuming b it ef efficiently in many parts of the country fuel oil I 1 natural gas and high grade coal are becoming scarce and the only plentiful supply of fuel for industrial purposes consists of tile the low grades of bituminous and semi bituminous coals the difficulty of designing stokers smokers that will operate properly with low grade coals has led to a b great great deal of experimentation in producing and burning zal pulverized coal in this as in every other phase of human ef effort fort results were first obtained by crude methods gradually gia dually becoming sh simplified n and perfected as the required requirements ants became better understood rood until now naw equipments equipment suitable for most industrial applications 2 such as for steam boilers burning cement potash ai and id other materials smelting smelling sm elting of me metals atals etc have been developed that are extreme in their simplicity free from most of the faatu features res that and maintain ance troublesome in are expensive in in first cost application and that have made the use of pulverized coal objectionable A perfected apparatus is is now made by the erie city iron works and is known as the erie city ir iron on works coal and furnace the consists essentially of a cylindrical housing co containing staining nta ining a rotor mounted on a shaft the rotor being composed of pulverizing elements and a fan fail coal of a size that will pass through a lys W I 1 ring rin and of almost any moisture content is fed to tile the pulver izer and rea reduced to a p powder bowder of such fineness that it burns practically like gas or the oil fan draws in sufficient air to p ropel propel the coal through t the and at the same time to support combustion the air air can be regulated to tile the greatest nicety for both purposes and as the coal is accompanied from tile the to the burnace furnace by a quantity of uniformly brinly distributed air for arm bustion each particle of coal having its proper proportion this air can be reduced to a lower excess above the theoretical quantity than is possible by any other means of combustion with this apparatus it is entirely practicable to reduce the excess air to 5 to 10 percent maintaining 16 to 17 percent of cb coa which means that higher efficiencies are obtained by this system with other means of burning coal the excess air air may be 50 to percent of that theoretically required to raise the temperature of the excess air from that of the room to that of the escaping chimney gas requires a great quantity of heat the erie city iron works can be applied to practically all boiler installations and can be driven by electric motor steam turbine direct connected or silent chain drive pulverized coal equipment 1 utilization of coals with low btu atu con coni i tent high or low fusing ash high in sulphur 2 3 maximum efficiency in all rates of firing 4 perfectly flexible instant change of rate of firing adaptability to load demand changes 5 entire mechanism outside combustion space 6 all repairs and replacements made outside combustion space 7 small amount of combustible in ashes 8 no standby losses 9 low draft requirements 10 lowest labor cost of operation 11 no clinker or slag troubles with mechanism 12 one type machine for all kinds of coals 13 accurate control of air to fuel ratio 14 no cleaning of fires the unit system of installation is recommended that is to say sav one or more for each cach boiler I 1 the and discharge pipe are airtight air tight and no coal dust is apparent in the boiler room which is a very desirable fea feature tuve there is no pulverized coal in storage the coal being pulverized only as used the is of rugged construction and is comparatively noiseless in operation the equipment necessary in a boiler plant where slack coal is used consists of the following parts 1 magnetic separator 2 and furnace of suitable capacity 3 means of driving the r advantages of the use of pulverized coal compared with ordinary methods of burning coal will be seen from the following comparison stokers smokers 1 restricted to coals of medium to high btu atu low in sulphur high fusing ash 2 smoke varies with rate of firing 3 efficiency varies with rate of firing 4 imperfectly flexible varies with type 5 most of mechanism mecha ism exposed to combustion temperatures 6 most alost repairs and replacements made inside combustion space 7 moderate amount of combustible in ashes S standby losses 9 high draft requirement 10 low labor cost of operation 11 clinker and ash troubles with me mechanism machanis chanis in 12 different types for di ferent kinds of coal 13 imperfect control of air to fuel ratio 14 cleaning of fires hand fired grates 1 restricted to coals of medium to hi high hig h btu atu low in sulphur high fusing ash 2 smoke 3 efficiency dependent on skill of firemen varies with rate of firing 4 imperfectly flexible varies with skill of firemen 5 grates and firemen exposed to furnace temperatures 6 all repairs and replacements made inside combustion space 7 high hig h amount of combustible in ashes S large standby losses especially with one shift 9 high hig h draft requirements 10 high labor cost of operation 11 clinker and ash troubles 12 different grates for different coals 13 very imperfect control of air to fuel ratio 14 cleaning of fires |