Waste heat recovery device for lime production

Abstract

The utility model relates to the technical field of lime production, and discloses a waste heat recovery device for lime production, which comprises a heat exchange box, a cover plate arranged at the top of the heat exchange box, two heat exchange pipes arranged inside the heat exchange box, a water outlet pipe arranged at the lower part of the side surface of the heat exchange box, a water replenishing pipe arranged on the cover plate, a fixed box arranged at the front end of the heat exchange box, and an air inlet pipe fixedly connected with the front end of the fixed box, two air outlet pipes are connected to the input end of the heat exchange pipe, a pretreatment box is arranged behind the heat exchange box, a top cover is arranged on the top of the pretreatment box, three spray pipes are arranged on the lower portion in the pretreatment box, a feeding hopper and an exhaust pipe are arranged on the top of the top cover, and the output end of the heat exchange pipe is connected to the spray pipes through a first guide pipe; a bearing plate is arranged above the spraying pipe in the pretreatment box, a discharging opening is formed in the rear end of the pretreatment box, a sealing door is installed at the discharging opening, and an air outlet pipe is connected to the spraying pipe through a second guide pipe. The waste heat recovery rate is improved, meanwhile, energy consumption needed by the calcining furnace can be reduced, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lime production, in particular to a waste heat recovery device for lime production. Background Art

[0002] The lime production process generates a significant amount of waste heat, primarily from the calcination of limestone. Limestone decomposes into calcium oxide (lime) and carbon dioxide at high temperatures, a process that consumes significant amounts of heat energy. Waste heat recovery utilizes this underutilized heat energy generated during the production process to improve energy efficiency and reduce production costs.

[0003] The existing waste heat recovery device for lime production mainly realizes waste heat recovery through heat exchange. The flue gas discharged after heat exchange still contains a lot of heat, the waste heat recovery rate is not high, and it causes waste of resources. Utility Model Content

[0004] The technical problem to be solved by the present invention is that the flue gas discharged from the existing waste heat recovery device for lime production still contains a lot of heat and the waste heat recovery rate is not high.

[0005] In order to solve the above problems, the technical solution of the present invention is: a waste heat recovery device for lime production, comprising a heat exchange box, a cover plate is provided on the top of the heat exchange box, two heat exchange pipes are installed inside, a water outlet pipe is provided at the lower side, and a water supply pipe is provided on the cover plate, characterized in that: a fixed box is provided at the front end of the heat exchange box, an air inlet pipe is fixedly connected to the front end of the fixed box, and three air outlet pipes are fixedly connected to the rear end, two of the air outlet pipes are connected to the input end of the heat exchange pipe, a pretreatment box for processing limestone is provided at the rear of the heat exchange box, a top cover is provided on the top of the pretreatment box, three nozzles are provided at the lower inner part, a feed hopper is provided at one end of the top cover near the heat exchange box, and an exhaust pipe is provided at the other end, the output end of the heat exchange pipe is connected to the nozzle through a first conduit, a support plate is provided above the nozzle inside the pretreatment box, a discharge port is provided at the rear end, a plurality of through holes are provided on the support plate, a sealing door is installed at the discharge port, and one of the air outlet pipes is connected to the nozzle through a second conduit.

[0006] Furthermore, the heat exchange tube is a serpentine tube, and both ends thereof extend to the outside of the heat exchange box end.

[0007] Furthermore, valves are installed on the water outlet pipe and the three air outlet pipes.

[0008] Furthermore, the front end of the nozzle extends to the outside of the pretreatment box, the rear end is fixed to the bottom surface of the pretreatment box through a positioning plate, and a plurality of air outlets are provided on the top of the nozzle.

[0009] Furthermore, a sealing cover is provided on the top of the feed hopper.

[0010] Furthermore, the supporting plate is arranged to be inclined, and the front end thereof is higher than the rear end.

[0011] Furthermore, two guide plates are symmetrically provided at the top of the rear end of the support plate at the discharge port.

[0012] The advantages of this utility model over existing technologies are as follows: The flue gas is first heat-exchanged through the heat exchange tubes, and the flue gas after heat exchange heats the limestone, improving the utilization rate of the heat in the flue gas; opening the valve on the outlet pipe connected to the second conduit allows some flue gas to be directly transported through the second conduit into the nozzle, achieving secondary heating of the limestone and improving the heating effect of the limestone; the heated limestone requires less heat when entering the calciner, thereby reducing the energy consumption required by the calciner. This utility model improves the waste heat recovery rate and reduces the energy consumption required by the calciner, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional Figure 1 .

[0014] Figure 2 This is a three-dimensional Figure 2 .

[0015] Figure 3 It is a cross-sectional view of the heat exchange box of the present utility model.

[0016] Figure 4 It is a cross-sectional view of the pretreatment box of the utility model.

[0017] As shown in the figure: 1. Heat exchange box; 2. Cover plate; 3. Heat exchange tube; 4. Water outlet pipe; 5. Water supply pipe; 6. Fixed box; 7. Air inlet pipe; 8. Air outlet pipe; 9. Pretreatment box; 10. Top cover; 11. Nozzle; 12. Feed hopper; 13. Exhaust pipe; 14. Duct 1; 15. Support plate 16. Sealing door; 17. Duct 2; 18. Positioning plate; 19. Sealing cover; 20. Guide plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] like Figures 1 to 3As shown, a waste heat recovery device for lime production includes a heat exchange box 1, a cover plate 2 is provided on the top of the heat exchange box 1, two heat exchange tubes 3 are installed inside, and a water outlet pipe 4 is provided at the lower part of the side. The heat exchange tube 3 is a serpentine tube, and both ends of the heat exchange tube extend to the outside of the end of the heat exchange box 1. A water supply pipe 5 is provided on the cover plate 2. A fixed box 6 is provided at the front end of the heat exchange box 1, an air inlet pipe 7 is fixedly connected to the front end of the fixed box 6, and three air outlet pipes 8 are fixedly connected to the rear end. The two air outlet pipes 8 are connected to the input end of the heat exchange tube 3, and valves are installed on the water outlet pipe 4 and the three air outlet pipes 8.

[0020] Cold water is input into the heat exchange box 1 through the water supply pipe 5, the air inlet pipe 7 is connected to the flue gas duct of the calcining furnace, and the amount of flue gas flowing through the heat exchange pipe 3 is adjusted by the valve on the air outlet pipe 8, so as to realize heat exchange and preliminary utilization of waste heat.

[0021] like Figure 1 and Figure 4 As shown, a pretreatment box 9 for processing limestone is provided at the rear of the heat exchange box 1. A top cover 10 is provided on the top of the pretreatment box 9, and three nozzles 11 are provided at the lower inner part. A feed hopper 12 is provided at one end of the top cover 10 near the heat exchange box 1, and an exhaust pipe 13 is provided at the other end. A sealing cover 19 is provided on the top of the feed hopper 12. The front end of the nozzle 11 extends to the outside of the pretreatment box 9, and the rear end is fixed to the inner bottom surface of the pretreatment box 9 by a positioning plate 18, and a plurality of air outlets are provided on the top of the nozzle 11. The output end of the heat exchange tube 3 is connected to the nozzle 11 through a conduit 14. A supporting plate 15 is provided above the nozzle 11 inside the pretreatment box 9, and a discharge port is provided at the rear end. The supporting plate 15 is inclined, and its front end height is greater than the rear end. A plurality of through holes are provided on the supporting plate 15, and a sealing door 16 is installed at the discharge port. An air outlet pipe 8 is connected to the nozzle 11 through a conduit 2 17, and two guide plates 20 are symmetrically provided at the top of the rear end of the supporting plate 15 at the discharge port.

[0022] Limestone is added to the pretreatment box 9 through the feed hopper 12, and then the sealing cover 19 is closed. The flue gas flowing out of the heat exchange tube 3 is transported to the nozzle 11 through the first conduit 14 and ejected through the nozzle 11, which can achieve initial heating of the limestone. The valve on the outlet pipe 8 connected to the second conduit 17 is opened and adjusted to allow part of the flue gas to be directly transported through the second conduit 17 to the nozzle 11 and ejected through the nozzle 11, which can achieve secondary heating of the limestone and improve the heating effect of the limestone. The sealed door 16 is opened to discharge and collect the heated limestone and put it into the calciner. The heated limestone requires less heat when entering the calciner, which can reduce the energy consumption required by the calciner.

[0023] In specific use, the flue gas is first subjected to heat exchange treatment through the heat exchange tube 3. The flue gas after heat exchange is transported to the nozzle 11 through the conduit 14 and ejected through the nozzle 11 to heat the limestone and improve the utilization rate of the heat in the flue gas; the valve on the outlet pipe 8 connected to the conduit 2 17 is opened, and part of the flue gas is directly transported to the nozzle 11 through the conduit 2 17 to achieve secondary heating of the limestone and improve the heating effect of the limestone; the heated limestone requires less heat when entering the calcining furnace, thereby reducing the energy consumption required by the calcining furnace.

[0024] The undisclosed parts in the present invention are all prior art, and their specific structures and working principles are not described in detail here.

[0025] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0027] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A waste heat recovery device for lime production, comprising a heat exchange box (1), a cover plate (2) provided on the top of the heat exchange box (1), two heat exchange tubes (3) installed inside, a water outlet pipe (4) provided at the lower side, and a water supply pipe (5) provided on the cover plate (2), characterized in that: The front end of the heat exchange box (1) is provided with a fixed box (6), the front end of the fixed box (6) is fixedly connected to an air inlet pipe (7), and the rear end is fixedly connected to three air outlet pipes (8), two of the air outlet pipes (8) are connected to the input end of the heat exchange pipe (3), and a pretreatment box (9) for treating limestone is provided at the rear of the heat exchange box (1), the top of the pretreatment box (9) is provided with a top cover (10), and the lower part thereof is provided with three nozzles (11), and the top of the top cover (10) is close to the heat exchange box (1). A feed hopper (12) is provided at one end, and an exhaust pipe (13) is provided at the other end. The output end of the heat exchange tube (3) is connected to the nozzle (11) through a first conduit (14). A support plate (15) is provided above the nozzle (11) inside the pretreatment box (9), and a discharge port is provided at the rear end. The support plate (15) is provided with a plurality of through holes. A sealing door (16) is installed at the discharge port. One of the exhaust pipes (8) is connected to the nozzle (11) through a second conduit (17).

2. A waste heat recovery device for lime production according to claim 1, characterized in that: The heat exchange tube (3) is a serpentine tube, and both ends thereof extend to the outside of the heat exchange box (1).

3. The waste heat recovery device for lime production according to claim 1, characterized in that: Valves are installed on the water outlet pipe (4) and the three air outlet pipes (8).

4. The waste heat recovery device for lime production according to claim 1, characterized in that: The front end of the nozzle (11) extends to the outside of the pretreatment box (9), and the rear end is fixed to the bottom surface of the pretreatment box (9) through a positioning plate (18), and a plurality of air outlets are provided on the top of the nozzle (11).

5. The waste heat recovery device for lime production according to claim 1, characterized in that: A sealing cover (19) is provided on the top of the feed hopper (12).

6. The waste heat recovery device for lime production according to claim 1, characterized in that: The supporting plate (15) is arranged in an inclined manner, and the front end thereof is higher than the rear end.

7. The waste heat recovery device for lime production according to claim 6, characterized in that: Two material guide plates (20) are symmetrically provided at the top of the rear end of the supporting plate (15) at the material discharge port.

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