阅读说明：本技术 一种白水泥熟料制备系统及使用方法 (White cement clinker preparation system and use method ) 是由 康宇 钟永超 于 2020-07-01 设计创作，主要内容包括：本发明涉及一种白水泥熟料制备系统及使用方法,包括预热器系统、回转窑、急冷室、篦式冷却机、窑头换热器、窑头引风机、窑尾换热器、收尘器、窑尾引风机和鼓风机；预热器系统的出料口与回转窑的进料口相连,回转窑的出料口与急冷室的进料口相连,急冷室的出料口与篦式冷却机的进料口相连；预热器系统的出风口与窑尾换热器的进风口相连,窑尾换热器的出风口与收尘器的进风口相连；本发明采用还原冷却与篦式冷却机冷却相结合的工艺,通过在急冷室中引入超低氧或无氧烟气实现白水泥熟料的冷却和漂白,成本低,控制工艺简单；同时,充分并循环利用了系统中的热能以避免系统热损失,从而大幅降低了能耗。(The invention relates to a white cement clinker preparation system and a use method thereof, wherein the white cement clinker preparation system comprises a preheater system, a rotary kiln, a quenching chamber, a grate cooler, a kiln head heat exchanger, a kiln head draught fan, a kiln tail heat exchanger, a dust collector, a kiln tail draught fan and an air blower; the discharge hole of the preheater system is connected with the feed inlet of the rotary kiln, the discharge hole of the rotary kiln is connected with the feed inlet of the quenching chamber, and the discharge hole of the quenching chamber is connected with the feed inlet of the grate cooler; an air outlet of the preheater system is connected with an air inlet of the kiln tail heat exchanger, and an air outlet of the kiln tail heat exchanger is connected with an air inlet of the dust collector; the invention adopts the process of combining reduction cooling and grate cooler cooling, realizes the cooling and bleaching of white cement clinker by introducing ultra-low oxygen or oxygen-free flue gas into the quenching chamber, and has low cost and simple control process; meanwhile, the heat energy in the system is fully and circularly utilized to avoid heat loss of the system, so that the energy consumption is greatly reduced.)

1. A white cement clinker preparation system is characterized by comprising a preheater system, a rotary kiln, a quenching chamber, a grate cooler, a kiln head heat exchanger, a kiln head draught fan, a kiln tail heat exchanger, a dust collector, a kiln tail draught fan and an air blower; the discharge hole of the preheater system is connected with the feed inlet of the rotary kiln, the discharge hole of the rotary kiln is connected with the feed inlet of the quenching chamber, and the discharge hole of the quenching chamber is connected with the feed inlet of the grate cooler; the air outlet of preheater system links to each other with kiln tail heat exchanger's air intake, kiln tail heat exchanger's air outlet links to each other with the air intake of dust collector, the air outlet of dust collector links to each other with kiln tail draught fan's air intake, kiln tail draught fan's air outlet all links to each other with the air intake of quenching chamber and grate cooler, the air outlet of quenching chamber links to each other with kiln head heat exchanger's air intake, grate cooler's air outlet links to each other with kiln head heat exchanger's heat transfer medium air intake, kiln head heat exchanger's heat transfer medium air outlet links to each other with kiln head draught fan's air intake, kiln head draught fan's air outlet all links to each other with preheater system's air intake and rotary kiln's air intake, the air outlet of air-blower links to each.

2. A white cement clinker preparation system as recited in claim 1 further comprising a fuel injection means, said fuel injection means being disposed in said quenching chamber.

3. A method of using a white cement clinker preparation system, comprising the steps of:

(1) the raw meal is fed into a preheater system for preheating and carbonate decomposition, then is fed into a rotary kiln for calcination to generate white cement clinker, and then is fed into a quenching chamber.

(2) And (3) cooling the flue gas generated in the preheater system to below 100 ℃ after passing through a kiln tail heat exchanger, and then entering a quenching chamber through a dust collector under the drive of a kiln tail draught fan.

(3) The flue gas in the quenching chamber exchanges heat with the high-temperature white cement clinker, then the temperature is raised, and meanwhile, the fuel injection device injects fuel into the quenching chamber and burns the fuel to consume oxygen components in the flue gas, so that ultra-low oxygen or oxygen-free flue gas is formed, and even flue gas with trace CO is formed.

(4) And (3) feeding the quenched white cement clinker into a grate cooler, and sending cooling air into the grate cooler by an air blower to cool the white cement clinker for the second time, wherein the temperature of the cooling air is increased after the cooling air is heated by the clinker.

(5) The flue gas after being heated in the quenching chamber enters a kiln head heat exchanger, and the air after being heated in the grate cooler enters a medium channel of the kiln head heat exchanger and indirectly exchanges heat with the flue gas from the quenching chamber.

(6) The air after heat exchange is further heated and is divided into two paths to be output outwards under the drive of a kiln head draught fan, one path enters the rotary kiln for calcination, and the other path enters a preheater system to participate in fuel combustion and form high-temperature flue gas for raw meal preheating decomposition and white cement clinker calcination; the flue gas after heat exchange is cooled and enters a subsequent waste gas treatment system.

Technical Field

The invention relates to a white cement clinker preparation system and a use method thereof.

Background

As a variety of cement, white cement has to meet the requirements of stability, setting time, strength and the like of common cement, and the whiteness of the white cement is also ensured; the novel dry method cement calcining technology with a preheating predecomposition system is an advanced cement preparation technology at present, and is also suitable for preparing white cement clinker; in order to improve the whiteness of clinker, except for special design of batching and grinding equipment, the clinker discharged from a kiln needs to be bleached, the high-temperature white cement clinker cannot be air-cooled like the common silicate clinker, a grate cooler is simply adopted to carry out air cooling, so that low-valence transition metal oxide is easily oxidized into high-valence transition metal oxide to influence the whiteness of the clinker, and a special process is adopted to bleach the white cement clinker, so that the white cement clinker is an important link in the process of producing the white cement clinker.

The bleaching mode of the white cement clinker comprises the following bleaching media: water quenching bleaching, neutral medium bleaching and reducing medium bleaching; the bleaching method is water quenching bleaching, when the bleaching method is adopted, more white aluminate crystals can be formed in the cooled clinker, and the reflection capability of the clinker to light is greatly improved due to the fine mineral crystals, so that the whiteness is improved; however, water is sprayed on the surface of the high-temperature clinker, so that heat taken away by high-temperature steam cannot be efficiently utilized, the heat loss of a system is increased, and the energy consumption of a sintering preparation system is increased; the medium adopted in the neutral medium bleaching mode is mainly nitrogen, the medium adopted in the reducing medium bleaching mode is mainly coke oven gas, propane and the like, and although the neutral medium bleaching and the reducing medium bleaching have good bleaching effects, the cost is high, and the control process is complex.

Disclosure of Invention

In view of the current situation of the prior art, the technical problem to be solved by the present invention is to provide a white cement clinker preparation system and a use method thereof, wherein the white cement clinker preparation system and the use method thereof realize the cooling and bleaching of the white cement clinker by adopting a process combining reduction cooling and grate cooler cooling, have low cost and simple control process, and simultaneously fully and circularly utilize the heat energy in the system to avoid the heat loss of the system and greatly reduce the energy consumption.

The technical scheme adopted by the invention for solving the technical problems is as follows: a white cement clinker preparation system is characterized by comprising a preheater system, a rotary kiln, a quenching chamber, a grate cooler, a kiln head heat exchanger, a kiln head draught fan, a kiln tail heat exchanger, a dust collector, a kiln tail draught fan and an air blower; the discharge hole of the preheater system is connected with the feed inlet of the rotary kiln, the discharge hole of the rotary kiln is connected with the feed inlet of the quenching chamber, and the discharge hole of the quenching chamber is connected with the feed inlet of the grate cooler; the air outlet of preheater system links to each other with kiln tail heat exchanger's air intake, kiln tail heat exchanger's air outlet links to each other with the air intake of dust collector, the air outlet of dust collector links to each other with kiln tail draught fan's air intake, kiln tail draught fan's air outlet all links to each other with the air intake of quenching chamber and grate cooler, the air outlet of quenching chamber links to each other with kiln head heat exchanger's air intake, grate cooler's air outlet links to each other with kiln head heat exchanger's heat transfer medium air intake, kiln head heat exchanger's heat transfer medium air outlet links to each other with kiln head draught fan's air intake, kiln head draught fan's air outlet all links to each other with preheater system's air intake and rotary kiln's air intake, the air outlet of air-blower links to each.

Preferably, the fuel injection device is arranged in the quenching chamber.

A method of using a white cement clinker preparation system, comprising the steps of:

(1) the raw meal is fed into a preheater system for preheating and carbonate decomposition, then is fed into a rotary kiln for calcination to generate white cement clinker, and then is fed into a quenching chamber.

(2) And (3) cooling the flue gas generated in the preheater system to below 100 ℃ after passing through a kiln tail heat exchanger, and then entering a quenching chamber through a dust collector under the drive of a kiln tail draught fan.

(3) The flue gas in the quenching chamber exchanges heat with the high-temperature white cement clinker, then the temperature is raised, and meanwhile, the fuel injection device injects fuel into the quenching chamber and burns the fuel to consume oxygen components in the flue gas, so that ultra-low oxygen or oxygen-free flue gas is formed, and even flue gas with trace CO is formed.

(4) And (3) feeding the quenched white cement clinker into a grate cooler, and sending cooling air into the grate cooler by an air blower to cool the white cement clinker for the second time, wherein the temperature of the cooling air is increased after the cooling air is heated by the clinker.

(5) The flue gas after being heated in the quenching chamber enters a kiln head heat exchanger, and the air after being heated in the grate cooler enters a medium channel of the kiln head heat exchanger and indirectly exchanges heat with the flue gas from the quenching chamber.

(6) The air after heat exchange is further heated and is divided into two paths to be output outwards under the drive of a kiln head draught fan, one path enters the rotary kiln for calcination, and the other path enters a preheater system to participate in fuel combustion and form high-temperature flue gas for raw meal preheating decomposition and white cement clinker calcination; the flue gas after heat exchange is cooled and enters a subsequent waste gas treatment system.

Compared with the prior art, the invention has the advantages that: the invention adopts the process of combining reduction cooling and grate cooler cooling, realizes the cooling and bleaching of white cement clinker by introducing ultra-low oxygen or oxygen-free flue gas into the quenching chamber, and has low cost and simple control process; meanwhile, the heat energy in the system is fully and circularly utilized to avoid heat loss of the system, so that the energy consumption is greatly reduced.

Drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1, a white cement clinker preparation system comprises a preheater system 1, a rotary kiln 2, a quenching chamber 3, a grate cooler 4, a kiln head heat exchanger 5, a kiln head induced draft fan 6, a kiln tail heat exchanger 7, a dust collector 8, a kiln tail induced draft fan 9 and a blower 11; a discharge port of the preheater system 1 is connected with a feed port of a rotary kiln 2, a discharge port of the rotary kiln 2 is connected with a feed port of a quenching chamber 3, and a discharge port of the quenching chamber 3 is connected with a feed port of a grate cooler 4; an air outlet of the preheater system 1 is connected with an air inlet of a kiln tail heat exchanger 7, an air outlet of the kiln tail heat exchanger 7 is connected with an air inlet of a dust collector 8, an air outlet of the dust collector 8 is connected with an air inlet of a kiln tail induced draft fan 9, an air outlet of the kiln tail induced draft fan 9 is connected with an air inlet of a quenching chamber 3 and an air inlet of a grate type cooling machine 4, an air outlet of the quenching chamber 3 is connected with an air inlet of a kiln head heat exchanger 5, an air outlet of the grate type cooling machine 4 is connected with a heat exchange medium air inlet of the kiln head heat exchanger 5, a heat exchange medium air outlet of the kiln head heat exchanger 5 is connected with an air inlet of a kiln head induced draft fan 6, and an air outlet of the kiln; the air outlet of the blower 11 is connected with the air inlet of the grate cooler 4.

In a preferred embodiment of the present invention, a white cement clinker preparation system further comprises a fuel injection device 10, the fuel injection device 10 being provided in the quenching chamber 3.

A method of using a white cement clinker preparation system, comprising the steps of:

(1) raw materials are fed into a preheater system 1, are preheated by the preheater system and decomposed by carbonate, then enter a rotary kiln 2 to be calcined to generate white cement clinker, and the calcined high-temperature white cement clinker is discharged from the rotary kiln 2 and is fed into a quenching chamber.

(2) The temperature of the flue gas (about 300 ℃) generated in the preheater system 1 is reduced to be below 100 ℃ after passing through a kiln tail heat exchanger 7; the cooled flue gas is driven by a kiln tail draught fan 9 to enter the quenching chamber 3 through a dust collector 8, and the dust collector 8 can filter out dust in the flue gas.

(3) The flue gas in the quenching chamber 3 exchanges heat with the high-temperature white cement clinker (about 1400 ℃) output from the rotary kiln 2, so that the temperature of the flue gas is raised by over 600 ℃, meanwhile, the fuel injection device 10 injects fuel into the quenching chamber 3 and burns the fuel to consume oxygen in the flue gas, ultra-low oxygen or oxygen-free flue gas is formed, and even flue gas with trace CO is formed, so that the bleaching effect of the white cement clinker is greatly promoted.

(4) The quenched white cement clinker (with the temperature of about 500 ℃) enters the grate cooler 4 for secondary cooling, cooling air is adopted as a cooling medium of the grate cooler 4, and the cooling air enters the grate cooler 4 through the air blower 11, so that the clinker temperature is reduced to be below 100 ℃; after the cooling air is heated by the clinker, the temperature rises to 200-300 ℃.

(5) The flue gas after being heated in the quenching chamber 3 enters the kiln head heat exchanger 5, and the air after being heated in the grate cooler 4 enters the medium channel of the kiln head heat exchanger 5 and indirectly exchanges heat with the flue gas from the quenching chamber 3.

(6) The air after heat exchange is further heated to more than 500 ℃ and is divided into two paths to be output outwards under the drive of a kiln head draught fan 6, one path enters the rotary kiln 2 for calcination, and the other path enters the preheater system 1 to participate in fuel combustion and form high-temperature flue gas for raw material preheating decomposition and white cement clinker calcination; cooling the flue gas after heat exchange to below 300 ℃ and entering a subsequent waste gas treatment system; in addition, high-temperature flue gas coming out of the quenching chamber 3 is also directly connected with a raw material grinding and waste gas treatment system in two ways, when the kiln head heat exchanger 5 fails and cannot run, the system works as it is, and only the temperature of hot air entering the rotary kiln 2 and the preheater system 1 is reduced, so that the heat consumption of the system is higher; in addition, when the moisture of the raw materials is high, part of high-temperature flue gas from the quenching chamber 3 is directly introduced into the raw material grinding system, and then the high-moisture raw materials are dried.

The invention adopts the process of combining reduction cooling and grate cooler cooling, realizes the cooling and bleaching of white cement clinker by introducing ultra-low oxygen or oxygen-free flue gas into the quenching chamber 3, and has low cost and simple control process; meanwhile, the heat energy in the system is fully and circularly utilized to avoid heat loss of the system, so that the energy consumption is greatly reduced.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.