阅读说明：本技术 一种余热自煅烧仓体 (Waste heat self-calcining bin body ) 是由 赵嘉珩 赵建纲 于 2019-12-10 设计创作，主要内容包括：一种余热自煅烧仓体,属于石膏粉煅烧领域,包括内壁,保温层,进料装置,出料装置,安装架；所述的余热自煅烧仓体上设置有温度测控装置,所述的温度测控装置包括温度测量装置,温度显示装置；所述的温度测量装置安装在内壁的内腔,有多个,均匀分布在内壁的高度方向,能够测量内壁各个区域的实时温度值,具有能够自动测量和显示仓体内的温度的特点。(A waste heat self-calcining bin body belongs to the field of gypsum powder calcining and comprises an inner wall, a heat insulation layer, a feeding device, a discharging device and a mounting frame; the waste heat self-calcining bin body is provided with a temperature measurement and control device, and the temperature measurement and control device comprises a temperature measurement device and a temperature display device; the temperature measuring device is arranged in the inner cavity of the inner wall, is provided with a plurality of temperature measuring devices, is uniformly distributed in the height direction of the inner wall, can measure the real-time temperature value of each area of the inner wall, and has the characteristic of automatically measuring and displaying the temperature in the bin body.)

1. A waste heat self-calcining bin body comprises an inner wall, a heat insulation layer, a feeding device, a discharging device and a mounting frame; the inner wall is a thin-wall cavity body and is made of metal materials; the heat-insulating layer wraps the periphery of the inner wall and can fully cover the periphery of the inner wall; the feed inlet is arranged at the upper part of the inner wall and is communicated with the inner cavity of the inner wall; the discharge hole is arranged at the lower end of the inner wall and is communicated with the inner cavity of the inner wall; the mounting rack is arranged on the inner wall, is fixedly connected with the inner wall and can support and fixedly mount the inner wall; the method is characterized in that: the waste heat self-calcining bin body is provided with a temperature measurement and control device, and the temperature measurement and control device comprises a temperature measurement device and a temperature display device; the temperature measuring devices are arranged in the inner cavity of the inner wall, are uniformly distributed in the height direction of the inner wall, and can measure real-time temperature values of all areas of the inner wall; the temperature display device is arranged outside the heat preservation layer, is connected with the temperature measuring device and can display the temperature value detected by the corresponding temperature measuring device.

2. The waste heat self-calcining bin body of claim 1, wherein: the temperature measuring device comprises a carrier and a temperature sensor; the carrier is in a hollow tubular shape, is arranged on the inner wall of the metal and is fixedly connected with the inner wall of the metal; more than one carrier is uniformly arranged along the height direction of the waste heat self-calcining bin body; the temperature sensor is arranged in the carrier, and a probe head of the temperature sensor is exposed out of the outer surface of the carrier; more than one temperature sensor is arranged uniformly along the length of the carrier and is connected with a temperature display device through a lead.

3. The waste heat self-calcining bin body of claim 1, wherein: the temperature display device is provided with a plurality of display modules, the number of the display modules is the same as that of the sensors, and the temperature display device can display temperature information collected by the corresponding sensors and convert the temperature information into a temperature value.

Technical Field

The invention belongs to the field of gypsum powder calcination, and particularly relates to a waste heat self-calcination bin body applied to a method for calcining dihydrate gypsum and converting dihydrate gypsum into anhydrous or hemihydrate gypsum.

Background

The dihydrate gypsum is a byproduct naturally existing in nature or produced in the production process of chemical enterprises, such as phosphorus chemical enterprises, desulfurization and denitrification devices and the like; at present, dihydrate gypsum is less directly applied in production and life, and hemihydrate gypsum is a common building material in the building industry and has the characteristics of no pollution, quick setting and the like; in order to convert the dihydrate gypsum into the hemihydrate gypsum, various methods are used, such as steaming, calcining and the like, and the calcining is a common method which is high in efficiency and easy to master; the principle is that dihydrate gypsum is calcined to 130 ℃ to 170 ℃, and is converted into hemihydrate gypsum after dehydration, but because the calcination temperature is difficult to control, people invent a high-temperature calcination method, namely, dihydrate gypsum is calcined at high temperature, dihydrate gypsum is converted into anhydrous gypsum or a mixture of anhydrous gypsum and hemihydrate gypsum, and the anhydrous gypsum or the mixture of anhydrous gypsum and hemihydrate gypsum is cooled and added with water to convert the dihydrate gypsum into hemihydrate gypsum; therefore, the applicant previously applied Chinese patent (application number: 2019104604978) to create a new method for high-efficiency and continuous calcination production, which is in the leading position in the current gypsum powder calcination industry; however, in practical applications, the following disadvantages are found; after the high-temperature calcined dihydrate gypsum enters a reduction device after being calcined, the quality fluctuates during reduction, the reduction process is difficult to control and is continuously adjusted, so that the quality consistency of the produced gypsum powder is not high and is difficult to control.

Disclosure of Invention

Aiming at the problems of the existing gypsum powder calcining method, the invention provides a gypsum powder calcining method which can solve the consistency problem of calcined gypsum powder in the reduction process and can realize continuous production, and the specific technical scheme is realized in such a way, the gypsum powder calcining method is characterized in that: the method comprises the following steps of 1, calcining dihydrate gypsum powder at high temperature; 2. conveying calcined gypsum powder to a waste heat self-calcining bin body in a real-time heat preservation state; 3. aging gypsum powder in a waste heat self-calcining bin body for 0-48 hours; 4. and outputting the aged gypsum powder from the calcining bin body through waste heat.

The step 1 is to heat the dihydrate gypsum powder to above 130 ℃, preferably a double-cylinder calcining furnace and a flame thrower furnace are adopted for calcining; the double-barrel calcining furnace has the characteristics of compact and reasonable structure, high heating temperature, high production efficiency, continuous production and convenience for industrial production.

Step 2 is to convey the gypsum powder calcined by the double-cylinder calcining furnace into a waste heat self-calcining bin body by adopting a heat-preservation conveying belt or other gypsum powder conveying devices; therefore, the self-calcination of the gypsum powder can be realized by ensuring that the temperature of the gypsum powder conveyed into the waste heat self-calcination bin body is higher than the required calcination temperature.

And 3, aging the calcined heat-preserving gypsum powder in a waste heat self-calcining bin body, wherein the aging time is selected according to the components and the temperature of the gypsum powder produced as required in the aging process.

And 4, sending out the aged gypsum powder for cooling, namely cooling the aged gypsum powder by adding additives or ventilating or adding water mist.

The steps are all completed by adopting gypsum powder calcining and calcining equipment.

The gypsum powder calcining equipment is characterized in that: comprises a calcining furnace and a waste heat self-calcining bin body; the calciner is a double-cylinder calciner and comprises an inner cylinder, an outer cylinder and a flame throwing furnace; the inner cylinder is arranged in the outer cylinder, is a columnar thin-wall cylinder and is concentrically and fixedly connected with the outer cylinder; the outer cylinder is arranged on the periphery of the inner cylinder, is concentrically and fixedly connected with the inner cylinder, is in a thin-wall cylinder shape, and has an opening at one end and a closed end at the other end; the flame-throwing furnace is arranged at one end of an opening of an outer cylinder of the flame-throwing furnace, and a flame-throwing port of the flame-throwing furnace is aligned with an inner cavity of the inner cylinder at one end of the opening of the outer cylinder; the outer cylinder and the inner cylinder are provided with a feed inlet and a discharge outlet at one end of the opening of the outer cylinder, and the positions of the feed inlet and the discharge outlet are distributed through the wrapping head; the inner walls of the outer cylinder and the inner cylinder are provided with a material pushing plate and a material lifting plate; the waste heat self-calcining bin body is arranged near the calcining furnace and is connected with the calcining furnace through a heat-insulating conveying device, the feeding end of the heat-insulating conveying device is connected with the discharging hole of the calcining furnace, and the discharging end of the heat-insulating conveying device is in butt joint with the feeding hole of the waste heat self-calcining bin body; the waste heat self-calcining bin body is provided with more than one waste heat self-calcining bin body, and the internal volume of the waste heat self-calcining bin body is matched with the product of the calcining furnace in unit time.

Furthermore, the volume of the waste heat self-calcining bin body is the capacity of the calcining furnace for producing the gypsum powder within 5-6 hours.

Furthermore, the aging time of the gypsum powder in the waste heat self-calcining bin body can meet the requirement of the rotation of a plurality of waste heat self-calcining bin bodies after the quantity and the volume of the waste heat self-calcining bin bodies are matched, so that the continuous production of the calcining furnace is ensured without intermittence.

Furthermore, the waste heat self-calcining bin body comprises an inner wall, a heat insulation layer, a feeding device, a discharging device and a mounting frame; the inner wall is a thin-wall cavity body and is made of metal materials; the heat-insulating layer wraps the periphery of the inner wall and can fully cover the periphery of the inner wall; the feed inlet is arranged at the upper part of the inner wall and is communicated with the inner cavity of the inner wall; the discharge hole is arranged at the lower end of the inner wall and is communicated with the inner cavity of the inner wall; the mounting bracket set up on the inner wall, with inner wall fixed connection, can support and fixed mounting inner wall.

Furthermore, the heat-insulating layer is made of heat-insulating materials.

Furthermore, the insulating layer is preferably made of aluminum silicate fiber and asbestos fiber.

Furthermore, the feeding device is provided with a cover door capable of being opened and closed.

Furthermore, a cover door capable of being opened and closed is arranged on the discharging device.

Furthermore, the heat preservation conveying device is a conveying belt with a heat preservation device at the periphery and a bucket elevator.

Furthermore, a temperature measurement and control device is arranged on the waste heat self-calcining bin body, and comprises a temperature measurement device and a temperature display device; the temperature measuring devices are arranged in the inner cavity of the inner wall, are uniformly distributed in the height direction of the inner wall, and can measure real-time temperature values of all areas of the inner wall; the temperature display device is arranged outside the heat preservation layer, is connected with the temperature measuring device and can display the temperature value detected by the corresponding temperature measuring device.

Furthermore, the temperature measuring device comprises a carrier, a temperature sensor; the carrier is in a hollow tubular shape, is arranged on the inner wall of the metal and is fixedly connected with the inner wall of the metal; more than one carrier is uniformly arranged along the height direction of the waste heat self-calcining bin body; the temperature sensor is arranged in the carrier, and a probe head of the temperature sensor is exposed out of the outer surface of the carrier; more than one temperature sensor is arranged uniformly along the length of the carrier and is connected with a temperature display device through a lead; the temperature display device is provided with a plurality of display modules, the number of the display modules is the same as that of the sensors, and the temperature display device can display temperature information collected by the corresponding sensors and convert the temperature information into a temperature value.

Advantageous effects

The invention has the advantages of ensuring the temperature of the gypsum powder entering the cooling and reducing procedures to be consistent, ensuring the consistency of the product quality and saving energy.

Drawings

FIG. 1 is a schematic view of a calciner

11. The device comprises a flame throwing furnace, 12 parts of a discharge hole, 13 parts of a feed hole, 14 parts of an outer cylinder and 15 parts of an inner cylinder.

FIG. 2 is a schematic structural diagram of a waste heat self-calcining bin body

21. The device comprises a feeding device, 23 an insulating layer, 24 a mounting frame, 25 a discharging device, 26 a temperature measuring device and 27 a temperature display device.

FIG. 3 is a schematic sectional view of a self-calcining bin body using waste heat

21. The device comprises a feeding device, 22, a metal inner wall, 23, an insulating layer, 24, a mounting frame, 25, a discharging device, 26, a temperature measuring device and 27, and a temperature display device.

FIG. 4 is a schematic structural diagram of an embodiment of the present invention

1. The process comprises the steps of a calcining furnace, 2, a waste heat self-calcining bin body, 3, a conveying belt, 4, a conveying and distributing device and 5, a bucket elevator.

Detailed Description

For further explanation of the technical solutions of the present invention, the following description will be made with reference to the accompanying drawings; as shown in fig. 1-4, in this embodiment, a steel plate is used as the metal inner wall 22, the steel plate is formed and welded into a thin-walled cavity, the upper end and the lower end of the thin-walled cavity are respectively opened, and the volume of the inner cavity of the metal inner wall 22 is calculated according to the density of gypsum powder so as to accommodate 120 tons of gypsum powder; selecting a steel pipe as a feeding pipe of the feeding device 21 at an upper opening of the metal inner wall 22, hermetically welding one end of the feeding pipe with the periphery of the upper opening of the metal inner wall 22, enclosing the upper opening, hermetically welding a flange with a connecting hole, which is commonly used in the industry, at the upper end of the feeding pipe, covering a cover matched with the flange on the flange, connecting the cover and the flange by bolts, and opening and closing the flange hole to form the feeding device 21; selecting the same structure as the feeding device 21 and welding the same at the lower opening of the metal inner wall 22 to be used as a discharging device 25; in the embodiment, a tank body mounting rack with feet, which is commonly used in the industry, is selected as a mounting rack 24, and the mounting rack 24 is welded at the lower part of the metal inner wall 22; in the embodiment, the heat-insulating material commonly used in the industry, namely aluminum silicate fiber, is selected to be wrapped outside the metal inner wall 22, the feeding device 21, the discharging device 25 and the mounting frame 24, and the thickness of the heat-insulating material is not less than 30 mm and is used as the heat-insulating layer 23; in order to overcome the problems of high randomness and inconvenient application of manual measurement, in the embodiment, a commercially available temperature sensor commonly used in the industry is selected as a sensor of a temperature measuring device 26, an aluminum alloy pipe commonly used in the industry is selected as a carrier of the temperature measuring device, the length of the carrier is equal to the radius of the cross section circle of the metal inner wall 22, 3 temperature sensors are uniformly distributed and installed in the carrier, the probe heads of the temperature sensors are exposed out of the surface of the carrier, and a lead is led out from one end, positioned outside a bin body, of the carrier from the inside of the carrier and is respectively connected with a temperature display device 27, so that the temperature measuring device is; in this example, a temperature display device matched with the sensor of the temperature measuring device 26 is selected as the display unit of the display device in this example, a plurality of display units are combined and installed on a box body panel to serve as the temperature display device 27, the temperature display device 27 is installed on the installation frame 24, and each display unit is connected with the corresponding sensor through a wire, so that the implementation of the waste heat self-calcining bin body 2 is completed.

In this example, the double-barrel calciner and the flaming furnace of the previously applied Chinese patent (application number: 2019104604978) are selected to form the calciner 1 of this example, in this example, phosphogypsum is used as an example, the calciner with the output of 20 tons per hour is used as an example in this example, the internal volume of a single residual heat self-calcining bin body 2 is 120 tons, one calciner 1 is provided with 4 residual heat self-calcining bin bodies 2, the residual heat self-calcining bin body 2 is arranged near the calciner 1, phosphogypsum powder is fed into an outer barrel 14 of the calciner 1 from a feed inlet 13 of the calciner 1, the phosphogypsum is preliminarily preheated in the outer barrel 14 and moves to the tail part of the outer barrel 14 through the action of a material pushing plate and a poplar plate under the action of the outer barrel 14, the phosphogypsum enters an inner barrel 15 through a cone after moving to the tail part of the outer barrel 14, the phosphogypsum moves from the tail part to the front end of the inner barrel 15 through the action of the, is burned by flame, is heated to more than 360 ℃, and is sent out from a discharge port 12 to enter a conveying belt 3 with a heat preservation facility; in the embodiment, a belt conveying device which is commonly used in the industry and is provided with a heat-insulating cover outside is selected as the conveying belt 3; after gypsum powder sent out from a discharge port 12 of a calcining furnace 1 enters a conveying belt 3 with a heat preservation facility, according to the working condition of waste heat from a calcining bin body 2, opening and closing of different striker plates on a conveying and distributing device 4 are started, in the example, a conveying belt multi-outlet distributing device which is universal in the industry is selected, a heat preservation cover is additionally arranged outside the conveying and distributing device 4, corresponding waste heat needing to be fed is opened from the striker plate corresponding to the calcining bin body 2, the gypsum powder enters a bucket elevator 5 which is arranged on the waste heat self-calcining bin body 2, and the gypsum powder is conveyed into a feeding device 21 of the waste heat self-calcining bin body 2 through the bucket elevator 5 and then enters an inner cavity of a metal inner wall 22; in the embodiment, a bucket elevator 5 which is a bucket elevator and is commonly used in the industry is selected and a heat preservation cover is added outside the bucket elevator; the discharge hole of each bucket elevator 5 is butted with the feeding device 21 of the waste heat self-calcining bin body 2; the calcining furnace 1 is used for continuous production, when the first waste heat self-calcining bin body 2 is full, a cover door on a feeding device 21 of the first waste heat self-calcining bin body 2 is closed, a baffle plate on a conveying and distributing device 4 corresponding to the first waste heat self-calcining bin body 2 is closed, meanwhile, a baffle plate on the conveying and distributing device 4 corresponding to the second waste heat self-calcining bin body 2 is opened, the baffle plate is butted with a bucket elevator 5 of the second waste heat self-calcining bin body 2, and the second waste heat self-calcining bin body 2 is filled; when the second waste heat self-calcining bin 2 is full, the cover door of the feeding device 21 is closed, the same working procedure is adopted to connect the third waste heat self-calcining bin 2, the second waste heat self-calcining bin is closed to carry out heat preservation and aging, and the fourth waste heat self-calcining bin 4 is sequentially full; when the fourth waste heat self-calcining bin body 2 starts to be filled, the first waste heat self-calcining bin body 2 is aged for a long time, the temperature display devices 27 of the upper, middle and lower parts of the first waste heat self-calcining bin body 2 are manually observed whether the temperatures are consistent and reach the set temperature, if the temperatures reach the set temperature, the discharging device 25 of the first waste heat self-calcining bin body 2 is started, and the aged gypsum powder is conveyed to the next procedure for continuous processing through the conveying device; in the embodiment, the conveying device is a scraper conveyor as the conveying device; 4 waste heat self-calcining bin bodies work in 2 turns in sequence, so that the intermittent continuous gypsum calcining process is realized; because the waste heat self-calcining bin body 2 is adopted, the aged gypsum powder is homogenized in temperature, crystal conversion can be generated under the condition of a certain temperature due to the characteristics of the gypsum powder, the agglomerated part or the part with low temperature in the gypsum powder can be subjected to temperature conduction of the gypsum powder with high temperature, and because the aging time is long, sufficient heat conduction can be obtained, and because the outer heat-insulating layer 23 of the waste heat self-calcining bin body 2 can ensure that the heat dissipation in the waste heat self-calcining bin body 2 is limited, and the temperature continuity is strong; the most important core is that although the gypsum powder is a poor conductor of heat conduction, the metal inner wall 22 is adopted, namely the heat of the gypsum powder can be quickly conducted along the metal inner wall 22 through the metal inner wall 22 with good heat conduction performance, so that the heat in the waste heat self-calcining bin body 2 is balanced and spreads to the center of the inner cavity from the part close to the inner wall, the expected effect can be achieved after long time aging, and the conclusion and the experimental result are obtained through repeated verification.