阅读说明：本技术 一种仿古城墙砖控制烧结曲线的方法 (Method for controlling sintering curve of antique city wall brick ) 是由 袁东海 谢博宣 谢祥 郭传杰 黄强 任巧雷 许运成 于 2019-09-19 设计创作，主要内容包括：本发明涉及城墙砖技术领域,且公开了一种仿古城墙砖控制烧结曲线的方法,包括以下步骤：1)码窑：将砖坯码放到砖窑内部；2)排潮：对窑内的砖坯进行干燥排潮处理；3)升温：对窑内的砖进行加热升温,并控制升温速度；4)烧结：将窑内温度继续升高；5)均窑：保持烧结阶段的最高温度；6)还原：关闭外部风机,保持内部温度。该仿古城墙砖控制烧结曲线的方法,按照码窑、排潮、升温、烧结、均窑和还原的步骤,对仿古城墙砖砖坯进行了全方位的烧结成型,并且合理控制每个流程的时间和温度,从而形成最佳的温度时间比,并增加均窑环节,使窑内各处温度一致,避免了由于温差而对产品质量造成的影响,提高了烧结的合格率。(the invention relates to the technical field of city wall bricks, and discloses a method for controlling a sintering curve of an antique city wall brick, which comprises the following steps: 1) setting a kiln: stacking the green bricks in a brick kiln; 2) moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln; 3) and (3) heating: heating the bricks in the kiln, and controlling the heating speed; 4) and (3) sintering: continuously raising the temperature in the kiln; 5) kiln equalizing: maintaining a maximum temperature during the sintering phase; 6) reduction: and turning off the external fan and keeping the internal temperature. According to the method for controlling the sintering curve of the antique city wall brick, all-around sintering molding is carried out on green bricks of the antique city wall brick according to the steps of setting, removing moisture, heating, sintering, homogenizing and reducing, the time and the temperature of each flow are reasonably controlled, the optimal temperature-time ratio is formed, and the homogenizing link is added, so that the temperatures in each part of the kiln are consistent, the influence on the product quality due to the temperature difference is avoided, and the sintering qualification rate is improved.)

1. A method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps:

1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;

2) Moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln;

3) And (3) heating: heating the bricks in the kiln, and controlling the heating speed;

4) And (3) sintering: continuously raising the temperature in the kiln, and sintering and molding the green bricks;

5) kiln equalizing: keeping the highest temperature in the sintering stage, and carrying out temperature equalization treatment on the internal whole space;

6) Reduction: and (5) closing an external fan to form a closed environment in the brick kiln and keeping a certain temperature.

2. The method for controlling the sintering curve of the antique city wall brick according to claim 1, wherein the moisture removal stage is carried out by slowly heating the green brick at room temperature to 200 ℃, the maximum temperature is not more than two hundred degrees, and the moisture removal time is 30-40 h.

3. the method for controlling the sintering curve of the antique city wall bricks according to claim 1, wherein the temperature rise stage is used for raising the temperature in the kiln, the temperature rise range is 200-700 ℃, and the duration of the temperature rise stage is 40-50 h.

4. The method for controlling the sintering curve of the antique city wall brick as claimed in claim 1, wherein the temperature in the kiln is continuously heated in the sintering stage, the temperature range is controlled to 860-960 ℃, and the sintering time is 24-36 h.

5. the method for controlling sintering curve of antique city wall bricks according to claim 1, wherein the time of the kiln homogenizing stage is 4-6 hours, and the temperature of the kiln homogenizing stage is controlled at 850-900 ℃.

6. the method as claimed in claim 1, wherein the temperature of the reduction stage is 800-.

7. The method for controlling the sintering curve of the antique city wall bricks according to claim 1, wherein the total time of the procedures of setting kiln, removing moisture, raising temperature, sintering, homogenizing kiln and reducing is 5-7 days.

Technical Field

The invention relates to the technical field of city wall bricks, in particular to a method for controlling a sintering curve of an antique city wall brick.

Background

After the raw material mineral composition determination and thermal analysis tests are completed, the maximum allowable sintering temperature and the sintering temperature range are determined, and then a reasonable sintering curve can be determined according to actual conditions and experience.

The sintering curve is a curve showing the relationship between the firing temperature and the firing time. It comprises three stages of temperature rise, heat preservation and cooling (distinguishing the division of preheating, sintering, heat preservation and cooling zones in the operation of the kiln in the concept).

The firing curve of the qualified product can be obtained within the shortest sintering time (sintering period), which is called the optimal sintering curve. An optimal sintering curve exists for each raw material, but due to the limitation of a plurality of factors such as the structure of a kiln, a heating method, a stacking form and the like, the optimal sintering curve state is difficult to achieve in practical production. Only one reasonable sintering curve can be determined in connection with production practice. The reasonable sintering curve is the main basis of kiln design and sintering thermal regulation (including temperature, pressure, atmosphere, top-loading regulation and the like). The establishment of a reasonable sintering curve is related to the structure, the yield and the quality of the kiln, and has important practical meaning and economic benefit.

In practical application, the existing brickyard sintering curve is often neglected to be applied in order to improve the yield, so that a large amount of unqualified bricks are generated, and great economic loss is brought to enterprises.

disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for controlling a sintering curve of an antique city wall brick, which has the advantages of simple sintering process, accurate temperature control, high city wall brick forming rate and the like, and solves the problems of complex sintering process, undefined temperature control interval and low city wall brick forming rate in the past.

(II) technical scheme

In order to realize the purposes of simple sintering process, accurate temperature control and high urban wall brick forming rate, the invention provides the following technical scheme: a method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps:

1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;

2) moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln;

3) And (3) heating: heating the bricks in the kiln, and controlling the heating speed;

4) And (3) sintering: continuously raising the temperature in the kiln, and sintering and molding the green bricks;

5) Kiln equalizing: keeping the highest temperature in the sintering stage, and carrying out temperature equalization treatment on the internal whole space;

6) Reduction: and (5) closing an external fan to form a closed environment in the brick kiln and keeping a certain temperature.

Preferably, in the moisture removing stage, the green bricks are subjected to slow heating treatment, the heating temperature is between room temperature and 200 ℃, the highest temperature is not more than two hundred ℃, and the moisture removing time is 30-40 h.

preferably, the temperature rise stage is used for carrying out temperature rise treatment on the temperature in the kiln, the temperature rise range is 200-700 ℃, and the duration time of the temperature rise stage is 40-50 h.

preferably, the temperature in the kiln is continuously heated in the sintering stage, the temperature interval is controlled to be 860-960 ℃, and the sintering time is 24-36 h.

preferably, the time of the kiln homogenizing stage is 4-6 hours, and the temperature of the kiln homogenizing stage is controlled at 850-900 ℃.

Preferably, the temperature of the reduction stage is 800-860 ℃ and the time of the reduction stage is 3.5-5 h.

(III) advantageous effects

Compared with the prior art, the invention provides a method for controlling a sintering curve of an antique city wall brick, which has the following beneficial effects:

according to the method for controlling the sintering curve of the antique city wall brick, all-around sintering molding is carried out on green bricks of the antique city wall brick according to the steps of setting, removing moisture, heating, sintering, homogenizing and reducing, the time and the temperature of each flow are reasonably controlled, the optimal temperature-time ratio is formed, and the homogenizing link is added, so that the temperatures in each part of the kiln are consistent, the influence on the product quality due to the temperature difference is avoided, and the sintering qualification rate is improved.

Detailed Description

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

a method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps: 1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification; 2) moisture removal: carry out the dry processing of arranging the tide to the adobe in the kiln, arrange the tide stage and need carry out slow heat treatment to the adobe, the heating temperature is between room temperature to 200 degrees, the highest temperature is no longer than two hundred degrees, and arrange the tide time and be 30-40h, should use little fire at the intensification in-process, thereby slowly discharge the moisture of body, the temperature can not rise too fast, be close to the adobe of fire face, be heated more fast, cause inside and outside being heated inequality, thereby lead to the adobe to explode and split, and should also notice at row tide in-process: properly adjusting the frequency of the moisture exhaust fan, preventing moisture accumulation and avoiding moisture regain; 3) and (3) heating: heating the bricks in the kiln, controlling the heating speed, carrying out heating treatment on the temperature in the kiln in the heating stage, wherein the heating range is 200-; 4) and (3) sintering: continuously raising the temperature in the kiln, sintering and molding the green bricks, continuously heating the temperature in the kiln in the sintering stage, controlling the temperature interval to be 860-960 ℃, controlling the sintering time to be 24-36h, controlling the temperature in the sintering process within a specified range, and keeping for a period of time to basically mold the bricks; 5) kiln equalizing: keeping the highest temperature of the sintering stage, carrying out uniform temperature treatment on the internal whole space, wherein the time of the uniform kiln stage is 4-6 hours, the temperature of the uniform kiln stage is controlled at 850-; 6) reduction: and closing an external fan to form a closed environment in the brick kiln, keeping a certain temperature, keeping the temperature in the reduction stage at 800-860 ℃, keeping the time in the reduction stage at 3.5-5h, wherein the reduction stage aims to color the urban wall brick, and the brick body sintered under the condition of the whole layer is red, because the iron oxide is red due to the fact that the raw material contains the iron oxide, and is fused with the brick body after sintering, the iron oxide can be reduced into ferrous oxide through the reduction stage, the ferrous oxide is black, the required antique urban wall brick is produced through the subsequent 'water discharge' process, and the total time of the processes of setting the kiln, removing damp, heating, sintering, homogenizing the kiln and reducing is 5-7 days.