Gypsum powder calcination waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery and utilization, in particular to a gypsum powder calcination waste heat recovery device which comprises a fluidized bed furnace and a waste gas output pipeline arranged at a discharge port of the fluidized bed furnace, and further comprises a preheating bin with the output end communicated with the fluidized bed furnace and a water containing bin. A first heat exchange pipeline communicated with the waste gas output pipeline is arranged outside the preheating bin and used for preheating gypsum powder before the gypsum powder enters the fluidized bed furnace, and a second heat exchange pipeline communicated with the output end of the first heat exchange pipeline is arranged on the outer side of the water containing bin and used for heating liquid in the water containing bin. Hot waste gas firstly flows through the first heat exchange pipeline wrapping the gypsum powder preheating bin to preheat the gypsum powder before entering the fluidized bed furnace, the residual heat is transferred to water in the water containing bin after the heat is utilized for the first time, the heat is utilized for the second time, the waste gas heat is graded, and the utilization efficiency is improved.

Description

A waste heat recovery device for calcination of gypsum powder Technical Field

[0001] This utility model relates to the field of waste heat recovery and utilization technology, and in particular to a waste heat recovery device for calcination of gypsum powder. Background Technology

[0002] Calcining gypsum powder is a process in which raw gypsum is heated in a fluidized bed furnace to remove some of its water of crystallization, transforming it into calcium sulfate hemihydrate. Based on this, the calcined gypsum powder has a finer particle size and a larger specific surface area, allowing it to be better mixed with other materials during use, thus improving the quality and performance of the product. At the same time, the calcination process can also remove some impurities from the raw gypsum, increasing the purity of the gypsum powder and making it more suitable for the requirements of various industrial applications.

[0003] Currently, the most common technology for utilizing waste heat from gypsum powder calcination is heating water. For example, waste heat is transferred to water through waste heat boilers, heat exchangers, and other equipment for the production of domestic hot water, steam generation, or power generation. However, this single waste heat utilization method has obvious limitations. It is easy to have insufficient heat recovery or low heat exchange efficiency, and a large amount of usable waste heat is still wasted with the emission of waste gas. Summary of the Invention

[0004] This invention provides a waste heat recovery device for gypsum powder calcination to solve the problem of single waste heat recovery and utilization in the prior art.

[0005] The technical problem solved by this utility model is achieved by the following technical solution:

[0006] A waste heat recovery device for gypsum powder calcination includes a fluidized bed furnace and a waste gas output pipe located at the outlet of the fluidized bed furnace. It also includes a preheating chamber and a water tank connected to the output end of the fluidized bed furnace. The preheating chamber is provided with a first heat exchange pipe connected to the waste gas output pipe on its exterior for preheating the gypsum powder in the preheating chamber before it enters the fluidized bed furnace. The water tank is provided with a second heat exchange pipe connected to the output end of the first heat exchange pipe on its exterior for heating the liquid in the water tank.

[0007] Preferably, it also includes an auxiliary heating component for auxiliary heating of the water tank. The auxiliary heating component includes a water temperature sensor for detecting the water temperature in the water tank and a controller electrically connected to the water temperature sensor. A third heat exchange pipe with an output end connected to an exhaust gas output pipe is connected to the outer wall of the water tank, and a first valve is provided on the third heat exchange pipe.

[0008] Preferably, the fluidized bed furnace is also equipped with a pressure gauge electrically connected to the controller. When the controller receives a signal from the pressure gauge that the gas pressure inside the fluidized bed furnace exceeds a set threshold, it controls the first valve to open to release pressure.

[0009] Preferably, the exhaust gas output pipe is further provided with a second valve, which is located at the downstream end of the connection between the exhaust gas output pipe and the third heat exchange pipe.

[0010] Preferably, the second heat exchange pipe and the third heat exchange pipe are respectively attached to the outer wall of different parts of the water tank.

[0011] Preferably, the first heat exchange pipe, the second heat exchange pipe, and the third heat exchange pipe are all spiral-shaped and are all wrapped with insulation material.

[0012] The beneficial effects of this utility model are as follows: By first passing the hot waste gas through the first heat exchange pipe surrounding the gypsum powder preheating chamber, the waste gas transfers some of its heat to the gypsum powder, preheating the gypsum powder before it enters the fluidized bed furnace. This allows the gypsum powder to reach the required reaction temperature more quickly after entering the fluidized bed furnace, accelerating the reaction speed, improving production efficiency, and realizing the first utilization of heat. Then, the waste gas enters the second heat exchange pipe surrounding the water tank, transferring the remaining heat to the water in the water tank, completing the second utilization of heat. The heat from the waste gas is graded and used successively to preheat different media, fully exploring the value of the heat from the waste gas and improving utilization efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 is a schematic diagram of the isometric structure provided by this utility model;

[0015] Figure 2 is a schematic diagram of the isometric structure provided by this utility model.

[0016] Figure 3 is a partial cross-sectional structural diagram of the present invention.

[0017] In the diagram, 1 is the boiling furnace; 11 is the exhaust gas outlet pipe; 12 is the second valve; 2 is the preheating chamber; 3 is the first heat exchange pipe; 4 is the water tank; 5 is the second heat exchange pipe; 6 is the water temperature sensor; 61 is the controller; 7 is the third heat exchange pipe; 71 is the first valve; 8 is the pressure gauge; and 9 is the exhaust pipe. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0019] Referring to Figures 1-3, a waste heat recovery device for gypsum powder calcination includes a fluidized bed furnace 1 and a waste gas output pipe 11 located at the outlet of the fluidized bed furnace 1. It also includes a preheating chamber 2, the output end of which is connected to the fluidized bed furnace 1. The preheating chamber 2 contains gypsum powder awaiting entry into the fluidized bed furnace 1. A first heat exchange pipe 3, connected to the waste gas output pipe 11, is located on the outside of the preheating chamber 2. Hot gas from the fluidized bed furnace 1 enters the first heat exchange pipe 3 through the waste gas output pipe 11 and heats the preheating chamber 2. This heat transfer from the preheating chamber 2 to the pre-stored gypsum powder for preheating. Furthermore, as shown in the figures, to achieve a more uniform preheating effect for the gypsum powder in the preheating chamber 2, a stirring device can be provided to stir the gypsum powder, ensuring it fully contacts the inner wall of the preheating chamber 2 for better heat absorption. The preheating chamber 2 can also be constructed using a conductive... Using copper and other metals with good thermal properties, the preheated gypsum powder enters the fluidized bed furnace 1 after the control valve at the output end of the preheating chamber 2 is opened. This reduces the energy required for heating in the fluidized bed furnace 1, lowers its energy consumption, helps save energy and reduce production costs, and allows the gypsum powder to reach the required reaction temperature more quickly after entering the fluidized bed furnace 1, accelerating the reaction speed and improving production efficiency. At the same time, the exhaust gas discharged through the first heat exchange pipe 3 also carries some heat, so a water tank 4 is also included. A second heat exchange pipe 5 connected to the output end of the first heat exchange pipe 3 is provided on the outside of the water tank 4 to heat the liquid in the water tank 4. The heated liquid can be discharged for other uses, thus realizing the classification of exhaust gas heat and using it to preheat different media in sequence, fully exploiting the value of exhaust gas heat and improving utilization efficiency.

[0020] Referring to Figure 3, further, since some of the heat from the exhaust gas in the second heat exchange pipe 5 is utilized by the preheating chamber 2, resulting in insufficient heat from the exhaust gas in the water tank 4, or when the water consumption in the water tank 4 is large and a large amount of cold water is discharged into the water tank 4, the water temperature in the water tank 4 may not reach the set temperature. Therefore, in order to accelerate the heating of the water temperature in the water tank 4, an auxiliary heating component for auxiliary heating of the water tank 4 is also included. The auxiliary heating component includes a water temperature sensor 6 for detecting the water temperature in the water tank 4 and a controller 61 electrically connected to the water temperature sensor 6. A third heat exchange pipe 7 with its output end connected to the exhaust gas output pipe 11 is connected to the outer wall of the water tank 4, and a first valve 71 is provided on the third heat exchange pipe 7. When the water temperature sensor 6 detects that the water temperature in the water tank 4 is lower than the set threshold, it transmits a signal to the controller 61. The controller 61 controls the first valve 71 to be fully or partially opened, so that some of the exhaust gas in the boiling furnace 1 can directly enter the third heat exchange pipe 7 to heat the water tank 4.

[0021] The output ends of the second heat exchange pipe 5 and the third heat exchange pipe 7 can be connected to external waste gas treatment equipment, such as cyclone dust collectors, through the exhaust pipe 9, and the waste gas is discharged after treatment.

[0022] Referring to Figure 2, the first heat exchange pipe 3, the second heat exchange pipe 5, and the third heat exchange pipe 7 are all spiral-shaped, which can increase the contact area with the preheating chamber 2 or the water chamber 4, resulting in better heat transfer. At the same time, they are all wrapped with insulation materials such as rock wool to reduce the loss of heat in the exhaust gas.

[0023] Referring to Figure 1, further as described above, since the first heat exchange pipe 3, the second heat exchange pipe 5, and the third heat exchange pipe 7 are spiral-shaped, the increased shape and length of the pipes will lead to increased airflow resistance, which may affect the smoothness of the exhaust gas discharge from the fluidized bed furnace 1, and may even affect the normal operation of the fluidized bed furnace 1, such as causing the pressure inside the fluidized bed furnace 1 to rise. Therefore, a pressure gauge 8 electrically connected to the controller 61 is also provided on the fluidized bed furnace 1. The pressure gauge 8 can be a high-temperature resistant diaphragm pressure sensor, etc. When the controller 61 receives a signal from the pressure gauge 8 that the gas pressure inside the fluidized bed furnace 1 exceeds the set threshold, it controls the first valve 71 to open, so as to make the exhaust gas discharge efficiency greater and relieve pressure.

[0024] Referring to Figure 1, a second valve 12 is further provided on the exhaust gas output pipe 11. The second valve 12 is located at the downstream end of the connection between the exhaust gas output pipe 11 and the third heat exchange pipe 7. When the gypsum powder in the preheating chamber 2 has been preheated and no longer needs to be preheated, in order to avoid the exhaust gas in the fluidized bed furnace 1 from passing through the first heat exchange pipe 3 again into the subsequent second heat exchange pipe 5 and causing unnecessary waste, the second valve 12 can be closed at this time, and the exhaust gas in the exhaust gas output pipe 11 can directly enter the third heat exchange pipe 7 to heat the water tank 4.

[0025] Referring to Figure 3, the second heat exchange pipe 5 and the third heat exchange pipe 7 are further attached to the outer wall of different parts of the water tank 4. For example, the water tank 4 can be set as a "U" shaped structure. The second heat exchange pipe 5 and the third heat exchange pipe 7 are connected to the outer wall of the water tank 4 and the inner outer wall near the axis, respectively. The liquid in the water tank 4 can be heated from different parts, and the heating efficiency is higher.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for calcination of gypsum powder, comprising a fluidized bed furnace (1) and a waste gas output pipe (11) disposed at the outlet of the fluidized bed furnace (1), characterized in that, It also includes: a preheating chamber (2) whose output end is connected to the boiling furnace (1), and the outside of the preheating chamber (2) is provided with a first heat exchange pipe (3) connected to the exhaust gas output pipe (11) for preheating the gypsum powder in the preheating chamber (2) before it enters the boiling furnace (1); and a water tank (4), the outside of the water tank (4) is provided with a second heat exchange pipe (5) connected to the output end of the first heat exchange pipe (3) for heating the liquid in the water tank (4).

2. The gypsum powder calcination waste heat recovery device according to claim 1, characterized in that, It also includes an auxiliary heating component for auxiliary heating of the water tank (4), the auxiliary heating component includes a water temperature sensor (6) for detecting the water temperature in the water tank (4) and a controller (61) electrically connected to the water temperature sensor (6). A third heat exchange pipe (7) with its output end connected to the exhaust gas output pipe (11) is connected to the outer wall of the water tank (4), and a first valve (71) is provided on the third heat exchange pipe (7).

3. The gypsum powder calcination waste heat recovery device according to claim 2, characterized in that, The boiling furnace (1) is also equipped with a pressure gauge (8) electrically connected to the controller (61). When the controller (61) receives a signal from the pressure gauge (8) that the gas pressure in the boiling furnace (1) exceeds the set threshold, it controls the first valve (71) to open to release pressure.

4. The gypsum powder calcination waste heat recovery device according to claim 2, characterized in that, The exhaust gas output pipe (11) is also provided with a second valve (12), which is located at the downstream end of the connection between the exhaust gas output pipe (11) and the third heat exchange pipe (7).

5. The gypsum powder calcination waste heat recovery device according to claim 1, characterized in that, The second heat exchange pipe (5) and the third heat exchange pipe (7) are respectively attached to the outer wall of different parts of the water tank (4).

6. The gypsum powder calcination waste heat recovery device according to claim 2, characterized in that, The first heat exchange pipe (3), the second heat exchange pipe (5) and the third heat exchange pipe (7) are all spiral-shaped and are all wrapped with insulation material.

Images