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Method for producing sintered material from inorganic raw materials

A technology of sintered materials and mineral raw materials, applied in the field of producing cement clinker and mineral raw materials to produce sintered materials

Active Publication Date: 2020-09-22
FIVES FCB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Discarding a portion of the available heat is an obvious disadvantage of this method

Method used

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  • Method for producing sintered material from inorganic raw materials
  • Method for producing sintered material from inorganic raw materials
  • Method for producing sintered material from inorganic raw materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0052] Considering a cement plant combustion plant that consumes 2955kJ of combustible energy per kg of clinker, its cooler receives 1.837Nm for each kg of clinker to be cooled 3 Air. yields 0.909Nm 3 Combustion air, respectively 0.335Nm at 1160°C 3 0.574Nm of secondary air at 830°C 3 of three times the air. The volume of unused air is 0.928Nm 3 , the temperature is 223°C.

[0053] In order to recover unused heat and convert it into electricity using water / steam boiler, the unused air is divided into two streams, namely 0.664Nm at 260°C 3 middle flow and 0.264Nm at 130°C 3 For the discarded exhaust stream, increasing the temperature enables a consistently better conversion output of the intermediate stream. In this connection, for a plant producing 3000 t / d of clinker, 0.77 MW can be produced, which corresponds to a yield of 17.1%.

[0054] According to the invention, the exhaust gas flow (ie the third air fraction) is directed towards the tertiary air and the replacem...

example 2

[0056] For the same device described in Example 1, the organic Rankine cycle was used to generate electricity. Divide unused air into two streams, namely 0.729Nm at 250°C 3 middle flow and 0.199Nm at 123°C 3 of the discarded exhaust stream. In this connection, for a plant producing 3000 t / d of clinker, 0.52 MW can be produced, which corresponds to a yield of 15.2%.

[0057]According to one embodiment of the present invention, a part of the exhaust gas flow (i.e. the third air portion) is directed to the tertiary air, and the replaced tertiary air is mixed with the intermediate flow (i.e. the second air portion): put 0.115Nm 3 redirected, while 0.084Nm 3 is deprecated. The drop in combustion air temperature causes an increase in heat consumption, which reaches 3104 kJ per kg of clinker. Considering the corresponding increase in the demand for combustion air, there is 0.818Nm at 350°C 3 middle flow. For the 3000t / d plant already mentioned, 1.46MW can be produced, which co...

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Abstract

The invention relates to a method for producing sintered material from organic raw materials (11), said method being carried out in a device comprising: cyclone preheater (1), rotary furnace (2), grate cooler (3), And wherein, the raw material (11) is preheated in the cyclone preheater (1), the preheated material is calcined and sintered in the rotary furnace (2), and the cooling air (4, 40) is blown in the grate cooler (3) Cooling the calcined material generates hot air. According to the invention, from upstream to downstream, the hot air is divided into three parts, according to the direction of progress of the material in the grate cooler, said three parts of hot air are at a decreasing temperature, respectively comprising at least The possible presence of a first air fraction (5) in the combustion zone of the precalciner used as combustion air, an intermediate second air fraction (6) larger than the required combustion air for energy generation and at a lower temperature The third air portion (7) is directed at least a portion (71) of the third air portion (7) towards said combustion zone of the device for use as combustion air together with said first air portion (5).

Description

technical field [0001] The invention relates to a method for producing sintered material from mineral raw materials, said method being carried out in a plant comprising a cyclone preheater, a rotary furnace and a grate cooler. The field of the invention is that of methods and devices for the manufacture of cement clinker. Background technique [0002] The most common method for producing cement clinker is the so-called dry process combustion method, in which previously comminuted raw materials are calcined and then sintered in a rotary kiln. To reduce the energy required for operation, exchangers are added upstream and downstream of the rotary furnace, called clinker preheaters and coolers respectively, to recover the heat contained in the flue gases leaving the furnace upstream of the material and downstream of the sintering gas respectively The heat contained in the material. In this connection, the temperature of the products leaving the furnace is greater than 1000°C, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/47F27B7/20F27D15/02F27D17/00F27D13/00
CPCC04B7/47C04B7/475F27B7/2016F27D13/00F27D15/0213F27D17/004Y02P40/121F27B7/14F27B7/2033F27B7/34F27B7/383F27B7/42
Inventor 阿兰·科东尼厄
Owner FIVES FCB
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