RU1830436C - System of clearing boiler - Google Patents

Abstract

Use: in thermal power plants. SUMMARY OF THE INVENTION: The dust pipe of the dust concentrator is connected to the inlet of the mill, the dust concentrator is equipped with an additional waste pipe located in its cover, the cover and the bottom being conical. The branch pipe of the concentrated mixture discharge is located on the conical part of the bottom, and a conical divider 12 is installed in front of the additional discharge pipe. This allows to increase profitability. 1 ill.

Description

The invention relates to the field of reducing fuel preparation and can be used in thermal power plants,

. The purpose of the invention is to increase profitability.

The drawing shows a boiler cooking system.

The boiler dust preparation system comprises a mill 1, a dust concentrator 2, equipped with an axial discharge pipe 3 located in the bottom 4, tangential nozzles 5 and 6 of the gas coolant and air mixture inlet located in the middle part, a pipe 7 for discharge of the concentrated mixture and an inlet pipe 8, the latter being equipped with an e-swirl 9, connected to the outlet of the mill 1 and introduced into the waste pipe 3. connected to the input of the mill 1, and the dust concentrator 2 is equipped with an additional waste pipe 10 located in its cover 11, and

the bottom 4 and the cover 11 are made conical, the pipe 7 of the outlet of the concentrated mixture is placed on the conical part of the bottom 4, and a conical divider 12 is installed in front of the additional discharge pipe 10.

The dust preparation system also comprises a boiler furnace 13 with main and waste burners 14 and 15 and a gas intake window 16 connected by a gas duct 17 to a gas coolant inlet 5 with an additive 18 of recirculation gases. The main burners 14 are connected to the branch pipe 7 of the concentrated mixture by means of an ejector 19, and the waste burners 15 are connected to an additional discharge pipe 10 using a mill fan 20. A raw fuel estrus 21 is connected to the mill 1 inlet. The nozzle b for introducing the mixture can be connected to the exit of the second mill.

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The dust concentrator 2 is made of heat-resistant steel.

The boiler dust preparation system operates as follows,

The raw fuel in heat 21 along with the flue gases sucked from the waste pipe 3 of the dust concentrator 2 enters the mill 1, where it is crushed and partially dried. The temperature of the gases entering mill 1 is controlled by the addition of 18 recirculation gases. After grinding, the dust in the form of a mixture is carried out to the inlet pipe 8 of the dust concentrator 2, in which it is twisted by a swirl 9 and thrown into the dust concentrator 2 through the discharge pipe 3 into the opposite direction of the stream 2. At the outlet of the pipe 8, part of the gas carrier is turned 180 ° and goes back to the inlet mills, which increases the concentration of dust entering the dust concentrator 2. In addition, hot gases blow in a counter flow of dust particles ejected from the nozzle 8, which speeds up drying. 12, it returns to the bottom 4 along the walls of the housing and is again picked up by the upward flow, which ensures vertical dust recirculation in the housing of the dust concentrator. In addition, with the help of tangential inlet nozzles 5 and 6, the flow is twisted in a horizontal plane, which increases the residence time of dust in the hot gas zone. Part of the dry dust through the outlet pipe 7 enters the main burners 14 of the furnace 13, and the gas is removed through an additional discharge pipe 10 using the SO mill fan to the exhaust burners 15. The presence of two exhaust pipes in the dust concentrator 2 allows servicing two mills. The second mill can be turned on at peak loads and feed the mixture into the nozzle b of the mixture input,

Thanks to the drying of dust in the gushing mode in the counterflow of hot flue gases, the heat treatment of the incoming raw coal is effective, as a result of which the main burners 14

concentrated dry dust of even particle size distribution due to the thermal breaker occurring in the case of the dust concentrator.

The dust concentrator can work in

fluidization mode.

Thus, the use of the proposed dust preparation system allows to increase efficiency by increasing the quality of the dust entering the combustion.

Forumula and Dust Preparation System for a Boiler Containing a Mill, Dust Concentrator,

equipped with an axial discharge pipe located in the bottom, tangential nozzles of the gas coolant and gas mixture located in the middle part, a concentrated outlet pipe

mixture and the inlet pipe, the latter being equipped with a swirl, connected to the outlet of the mill and introduced into the discharge pipe, characterized in that, in order to increase efficiency, the discharge pipe

the dust concentrator is connected to the input

mills, and the Dust Concentrator is equipped with an additional discharge pipe located in its cover, the lid and bottom of the dust concentrator are conical, the branch pipe of the concentrated mixture discharge is placed on the conical part of the bottom, and a conical divider is installed in front of the additional discharge pipe.

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