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Roller mill with sealing gas impingement

A mill and drum technology, which is applied to coal mills, rotary grinding tables, and the field of operating such drum mills, can solve the problems of increased cost and increased cost, and achieve the effect of low leakage rate

Inactive Publication Date: 2011-05-18
HITACHI POWER EURO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this will lead to a significant increase in construction and manufac

Method used

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  • Roller mill with sealing gas impingement
  • Roller mill with sealing gas impingement
  • Roller mill with sealing gas impingement

Examples

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Embodiment Construction

[0030] Drum mill as coal mill (in figure 1 1 ) has a mill housing (denoted as a whole by 2 ) comprising the actual mill housing 2 a and the screening housing 2 b. A rotating grinding table 4 is arranged on the bottom side of the grinding bowl carrier 3 in the mill housing 2a. A grinding roll 5 as a grinding tool is located on the rotary grinding table 4 . The grinding rollers are pressed against the grinding table 4 by means of a pressure frame 6 cooperating with connecting rods 7 . The grinding bowl carrier 3 is arranged on the transmission device 34 , and the transmission device 34 is placed on the base 35 . Centrally located in the upper region of the sifter housing 2b is a sieving machine 8 which is fastened by means of a suspension 10 to the outside of a central grind feed 9 in the form of a central grind feed tube and which surrounds the grind feed. Feeding device 9 rotates. Two grinding stock discharges 11 lead to the outside of the sifter housing 2b. Formed in the...

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PUM

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Abstract

The present invention discloses a roller mill (1, 46), in particular a coal mill, comprising a mill housing (2) and a rotating grinding table (4) with grinding tools located thereon, in particular grinding rolls (5); a grind material feed (9); a classifier (8); at least one grind material exit (11); at least one sealing gas seal (14, 16, 17, 19) that seals off the mill interior (31) from the outside atmosphere in the area of moving mill elements; and a carrier gas feed (12), wherein the roller mill (1, 46) can be operated in pressurized mode, a solution is to be provided that facilitates the use of recirculated stack gas as sealing gas without significantly affecting the mill environment. This is accomplished in that at least the at least one sealing gas seal (14, 16) comprises a first sealing chamber (22a, 22b, 22c) and a second sealing chamber (23a, 23b, 23c), wherein the first sealing chamber (22a, 23a, 22b, 22c) is acted upon by a sealing gas having a sealing gas pressure that is greater than the mill pressure in the mill interior (31) during milling operation and the second sealing chamber (23a, 23b, 23c) is acted upon by a sealing gas having a sealing gas pressure that is lower than the sealing gas of the first sealing chamber (22a, 22b, 22c) and wherein a take-off, in particular a line (24a, 24b, 24c), is disposed at the second sealing chamber (23a, 23b, 23c), said take-off discharging the sealing gas from the second sealing chamber (23a, 23b, 23c).

Description

technical field [0001] The present invention relates to a drum mill, in particular a coal mill, comprising a mill housing and a rotating grinding table on which grinding tools, especially grinding rollers are arranged; a grinding material feeding device; a screening machine; a grinding material discharger at least one airtight gas seal, which closes the interior of the mill in the region of the movable milling part from the outside atmosphere; and a carrier gas inlet, the roller mill being able to operate in a pressurized mode. Furthermore, the invention relates to a method of operating such a roller mill. Background technique [0002] Drum mills are used in particular in the field of thermal power plants for grinding coal for combustion in the combustion chamber of a steam generator. The basic structure of a drum mill or other vertical mill consists of a mill housing with a rotating grinding table arranged in the mill housing and on which the grinding tools are positioned ...

Claims

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Application Information

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IPC IPC(8): B02C15/00
CPCB02C15/04B02C2015/002
Inventor 托马斯·克劳泽维尔纳·比斯霍夫蒂乌·莱文
Owner HITACHI POWER EURO
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