RU2093269C1 - Method of feeding fuel in heat power stations - Google Patents

Abstract

FIELD: heat power engineering. SUBSTANCE: method comprises discharging self-discharged cars on gallery 2 arranged above a service-reserve storage made up as slot hopper 3. Discharged coal is fed at first to prism 5 where metal inclusions are removed from it with the use of an electromagnet. The coal is then fed to screen 7 from which fine fraction is fed to hopper 3 and corse fraction is immediately fed to the grid of drum 8. Disintegrated coal is fed to movable hoppers 10 with vane feeders 9. The hoppers move at first under the action of gravity at an angle, and then, with the use of actuating chain 12, it lifts up to a level slightly above the charging ports of pre-hopper of mills 11. Charged hopper 10 further moves to conveyor 15 under the action of gravity. In front of the conveyer 15 it slows down. Conveyer 15 distributed charged hoppers 10 among mills 11. Empty hoppers are brought to way 18 for empty hoppers with a conveyor. They move in this way under the action of gravity up to switch 19 that switches empty hopper 10 in the way for charged hoppers. Empty hopper 10 moves in it under the action of gravity up to vane feeder 9, slows down, and the cycle repeats. EFFECT: simplified method. 2 cl, 3 dwg

Description

 The invention relates to a power system, in particular to methods for supplying solid fuel in thermal power plants.

 Currently, the main method of supplying solid fuel to thermal power plants is conveyor, in which coal, after unloading from railway cars on a flyover or by car dumpers, is conveyed by conveyors to crushers. After the crushers, crushed coal is also conveyed into the raw coal bunkers by conveyors, and from them by feeders to the mills.

 When fuel is supplied by conveyors, intense dusting occurs as a result of the oscillation of the conveyor belt when passing rollers. Dusting worsens the working conditions of workers, creates a fire and explosion hazard situation. To eliminate dust, a sophisticated aspiration system is required, as well as a systematic clean-up of all fuel supply rooms. The conveyor belt itself is made of combustible material, rubber, and, if burning coal gets on it from the center of spontaneous combustion, it can burn out and damage the fuel supply.

 The closest technical solution to the proposed one is the fuel delivery method described in [1] where, when unloading fuel from sea vessels, coal is fed by a grab loader to a movable hopper, from which it enters the conveyor located under the hopper, i.e. in this case, the mobile hopper moves together with the grab loader and is a damping capacity between the loader and the conveyor, because large portions of coal fed by the loader bucket cannot be stacked at once without spillage on the conveyor belt. Those. a conveyor method for supplying fuel is also used here.

 The aim of the invention is to improve working conditions, increase the reliability of fuel supply.

 Achieving this goal is achieved by moving crushed coal in silos. A transborder is used to distribute the bins between the mills.

 Another objective of the invention is to reduce energy costs for their own needs.

 To do this, the movement of empty and partially loaded bins occurs under the influence of its own weight. There is no energy cost for excessive coal rise due to the conveyor mode of transport.

 In FIG. 1 shows a plan of fuel supply; in FIG. 2 view along section A-A; in FIG. 3 type B.

 The essence of the proposed method is as follows.

 Solid fuel delivered to the thermal power plant by rail in self-unloading cars 1 (see Fig. 2), for example, with folding side walls and a bottom in the form of a prism, is unloaded under the influence of its own weight on the overpass 2 of the supply-reserve warehouse, made in the form slotted hopper 3. Before unloading, lids 4 are opened, closing after unloading. They serve to reduce the flow of coal dust into the atmosphere. The fuel being discharged enters the surface of the prism 5, along the lower edges of which there are installed dampers 6, which impede the progress of the fuel. An electromagnet moves from both sides above the layer of unloaded coal along the prism, extracting metal inclusions from coal. Then the shutters 6 are lowered and the coal enters the grate screen 7, from which the fine fraction immediately enters the hopper 3. The large fraction is crushed directly on the grate with a drum 8, driven or non-driven, having sufficient weight for crushing coal by crushing, moving along the hopper 3 .

 From the bunker 3, the fuel is fed by paddle feeders 9 to the mobile bunkers 10. The loaded bunker 10 is released and discharged under the influence of its own weight along the rails with a slope towards the mills 11 (Fig. 1, 3) to a counter slope equipped with a traction target 12. Through this chain the hopper 10 rises to the level of the loading window 13 of the mills 11 and then moves downhill under its own weight, braking in front of the paths 14 of the transborder 15 or in front of the previously delivered loaded hopper 10. After stopping in front of the cargo put I have 16 free transborder 15, the hopper 10 is released and rolled onto the transborder 15, which moves the loaded hopper to the mill, which is freed from empty bunkers. The hopper 10 rolls off the transborder by creating a slope of the rail in the direction of the mill 11 (hydraulic cylinders or electromechanical drive).

 The loaded hopper 10 is braked above the loading window 13 of the pre-hopper 17 of the mill 11, and the unloading estrus of the hopper 10 is automatically opened, which ensures the flow of coal into the pre-hopper 17. To regulate the fuel supply to the mill 11, a feeder of one or another design is installed between the mill and the pre-hopper (swing drum, etc. ) Each mill can accommodate two bins 10 at the same time.

 Then the transborder 15 stops against the empty hopper 10, which rolls onto the transborder by creating a bias towards the transborder in the same way as when rolling the hopper from the transborder. The empty hopper 10 is moved by a transborder to the paths 18 for empty bins, then rolled onto them by a transborder. The empty bunker under the influence of its own weight moves to the turnout 19, which translates the empty bunker 10 on a particular freight route. On it, the hopper under the action of its own weight moves to the feeder 9, under which it is braked. Then the process is repeated.

Using the fuel supply method in comparison with conveyor transportation has the following advantages:
working conditions for workers improve, as dust formation during transportation of coal or peat is excluded:
the absence of coal dust and a rubber conveyor belt reduces fire and explosion hazard and, accordingly, increases the reliability of fuel supply:
the predominant movement of the bunkers under the action of their own weight allows to reduce energy costs for their own needs.

Claims (2)

 1. A method of supplying fuel to thermal power plants, including unloading, crushing fuel, feeding it to mobile bins, moving fuel to mills, characterized in that metal inclusions are removed from it before feeding fuel into the slot hopper, and the fuel is transported to mills in mobile bunkers, while the distribution between the loaded mills and the collection of empty bunkers is carried out by a transborder, and the movement of the mobile bunkers is partially due to its own weight.  2. The method according to claim 1, characterized in that the fuel is unloaded from self-unloading cars.

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