Firework paper heat recovery device

Abstract

The firework paper heat recovery device comprises a digester body and a pot cover, the digester body is covered with the pot cover in a sealed mode, the pot cover is provided with a plurality of stirring and pressure adjusting mechanisms, and each stirring and pressure adjusting mechanism comprises an adjusting cylinder installed at the bottom of the pot cover and a piston stirring rod inserted into the adjusting cylinder; the piston stirring rod is provided with a stirring blade, a piston block and a supporting block, the piston block is installed in the piston cavity, the piston block and the side wall of the piston cavity are sealed in an attached mode, the stirring blade is installed on the part, inserted into the digester body, of the bottom end of the piston stirring rod, and the supporting block is provided with a plurality of annular balancing weights arranged on the piston stirring rod in a sleeving mode; waste heat of high-temperature cooking is conveyed into the steam generator in a steam mode, waste heat recovery is carried out, and the utilization rate of heat energy is increased. By arranging the structures such as the piston stirring rod and the adjusting cylinder, the stirring blades are driven to move to scatter slurry in the digester, so that the materials are prevented from sinking and accumulating, and the reaction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of firecracker paper production, and in particular to a firecracker paper heat recovery device. Background Art

[0002] Red firecracker paper is a special paper used to make fireworks, especially red firecracker packaging. Its production steps mainly include pulping, papermaking, and paper processing. Pulping is usually carried out by chemical pulping, which mainly includes cooking: the raw materials are chopped and mixed with caustic soda / lime, and then cooked in a cooking pot at high temperature and high pressure (130-170℃, 2-4 hours) to decompose lignin and form a coarse pulp. Washing and screening: The coarse pulp is passed through a pulp washer to remove black liquor (containing alkali and lignin), and then passed through a pulp screen to separate impurities (such as bark and sand particles) to obtain a fine pulp. The cooking process requires high temperature and high pressure. In existing production equipment, a lot of heat is not fully utilized, resulting in increased energy consumption. At the same time, since the raw materials need to be stirred during the cooking process to speed up the reaction process, the existing devices all require additional motors, stirrers and other structures for stirring. However, since the interior of the cooking pot is under high temperature and high pressure conditions, the installation of motors, stirrers and other structures can easily destroy the sealing of the cooking pot. Moreover, the motor has high requirements on motor performance under high temperature conditions, and it is difficult to ensure the stability of the operation. In view of the above problems, the present invention provides a firecracker paper production heat recovery device. Summary of the Invention

[0003] The purpose of the present invention is to provide a firecracker paper heat recovery device.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A firecracker paper heat recovery device comprises a cooking pot body and a pot cover, the pot cover is sealed on the cooking pot body, a liquid replenishing tube is installed on the upper side wall of the cooking pot body, a liquid replenishing pump and a liquid replenishing valve are installed on the liquid replenishing tube, the bottom and side walls of the cooking pot body are provided with a hollow heating chamber, a bottom heating resistance wire is installed in the bottom heating chamber, and a side heating resistance wire is installed in the side wall heating chamber, a plurality of stirring and pressure regulating mechanisms are provided on the pot cover, the stirring and pressure regulating mechanisms include an adjusting cylinder installed at the bottom of the pot cover and a piston stirring rod inserted in the adjusting cylinder, the interior of the adjusting cylinder is a contraction chamber, a piston chamber and a pressure relief chamber from bottom to top, the diameters of the contraction chamber, the piston chamber and the pressure relief chamber are arranged to increase in sequence, the piston stirring rod is provided with a stirring blade, a piston block and a support block, and the piston block is installed in the piston chamber The piston block is sealed against the side wall of the piston cavity, and the piston block can be moved up and down along the piston cavity under the action of external force. The stirring blade is installed on the part of the bottom end of the piston stirring rod inserted into the cooking pot body, and each piston stirring rod is equipped with multiple stirring blades, and the stirring blade can be rotatable relative to the piston stirring rod. The support block is arranged on the upper end of the piston stirring rod extending out of the pot cover, and multiple annular counterweights are placed on the support block. The connection position between the piston cavity and the pressure relief cavity adopts a truncated cone structure transition, and the upper end of the pressure relief cavity is connected to the exhaust cavity in the pot cover. A sealing ring is installed in the contact hole between the pot cover at the upper end of the exhaust cavity and the piston stirring rod. The side wall of the exhaust cavity is provided with an exhaust joint, and the exhaust joint is connected to the steam supply pipe of the steam generating device through an exhaust hose.

[0006] Furthermore, a plurality of electric heating pipes are provided at the bottom of the inner cavity of the steam generating device, and a steam supply pipe, a water supply pipe and a steam pipe are provided at the top of the steam generating device. A water supply valve is installed on the water supply pipe, and a steam valve is installed on the steam pipe.

[0007] Furthermore, the stirring blade is composed of multiple spiral blades and a mounting sleeve in the middle. The mounting sleeve in the middle of the stirring blade is mounted on the piston stirring rod. The mounting sleeve and the piston stirring rod are clearance-matched. The upper and lower ends of the mounting sleeve are respectively clamped into the retaining spring groove of the piston stirring rod through a retaining spring for limiting the position.

[0008] Furthermore, the number of counterweight blocks placed on the support blocks at the tops of the multiple piston stirring rods is set to be the same.

[0009] Furthermore, a vacuum cavity is provided on the side wall of the cooking pot body. The vacuum cavity is located outside the heating cavity. The vacuum cavity is connected to a vacuum pump through an exhaust pipe. A pressure-maintaining valve is installed on the exhaust pipe.

[0010] Furthermore, a heat-insulating cavity is provided on the side wall of the steam generating device.

[0011] Furthermore, the interior of the electric heating tube is a resistance wire, and the exterior of the resistance wire is sheathed with a metal sheath.

[0012] Furthermore, two lifting ears are provided on both sides of the top of the pot cover.

[0013] In summary, the present invention has the following beneficial effects:

[0014] 1. The waste heat from high-temperature cooking is transported to the steam generator in the form of steam for waste heat recovery, which is used for evaporation and concentration of slurry and washing waste liquid in subsequent processes, thereby improving the utilization rate of thermal energy.

[0015] 2. By setting up structures such as the piston stirring rod and the adjusting cylinder, the high-pressure steam generated by the cooking pot during the heating process can be used to push the piston stirring rod up and down, driving the stirring blades to move and disperse the slurry in the cooking pot, avoiding the sinking and accumulation of the material, thereby improving the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the steam generating device of the present invention;

[0018] Figure 3 It is a structural diagram of the stirring and pressure regulating mechanism;

[0019] Figure 4 This is a schematic diagram of the installation of the stirring blade;

[0020] Figure 5 This is a top view of the structure of the pot cover;

[0021] In the figure, 1. cooking pot body; 2. pot cover; 3. piston stirring rod; 4. regulating cylinder; 5. stirring blade; 6. heating chamber; 7. vacuum chamber; 8. side heating resistance wire; 9. bottom heating resistance wire; 10. liquid replenishing pipe; 11. liquid replenishing pump; 12. liquid replenishing valve; 13. exhaust chamber; 14. lifting ear; 15. counterweight; 16. exhaust pipe; 17. pressure maintaining valve; 18. exhaust joint; 19. exhaust hose; 20. steam replenishing pipe; 21. steam generating device; 22. electric heating pipe; 23. water replenishing pipe; 24. steam pipe; 25. insulation cavity; 26. steam valve; 27. water replenishing valve; 28. piston block; 29. ​​support block; 30. sealing ring; 31. contraction chamber; 32. piston chamber; 33 pressure relief chamber; 34. retaining spring. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-5 As shown, a firecracker paper heat recovery device comprises a cooking pot body 1 and a pot cover 2, the pot cover 2 is sealed on the cooking pot body 1, a liquid infusion tube 10 is installed on the upper side wall of the cooking pot body 1, a liquid infusion pump 11 and a liquid infusion valve 12 are installed on the liquid infusion tube 10, a hollow heating chamber 6 is provided at the bottom and side wall of the cooking pot body 1, a bottom heating resistance wire 9 is installed in the heating chamber 6 at the bottom, and a side heating resistance wire 8 is installed in the heating chamber 6 on the side wall, a plurality of stirring and pressure regulating mechanisms are provided on the pot cover 2, the stirring and pressure regulating mechanisms include an adjusting cylinder 4 installed at the bottom of the pot cover 2 and a piston stirring rod 3 inserted in the adjusting cylinder 4, the interior of the adjusting cylinder 4 is a contraction chamber 31, a piston chamber 32 and a pressure relief chamber 33 from bottom to top, the diameters of the contraction chamber 31, the piston chamber 32 and the pressure relief chamber 33 are arranged to increase in sequence, the piston stirring rod 3 is provided with a stirring blade 5, a piston block 28 and a support block 29, the piston block 28 is installed in the piston chamber 32 The piston block 28 is sealed against the side wall of the piston cavity 32, and the piston block 28 can be moved up and down along the piston cavity 32 under the action of external force. The stirring blade 5 is installed on the part of the bottom end of the piston stirring rod 3 inserted into the cooking pot body 1, and each piston stirring rod 3 is equipped with multiple stirring blades 5, and the stirring blade 5 can be rotatable relative to the piston stirring rod 3. The support block 29 is arranged on the upper end of the piston stirring rod 5 extending out of the pot cover 2, and multiple annular counterweights 15 mounted on the piston stirring rod 3 are placed on the support block 29; the connection position between the piston cavity 32 and the pressure relief cavity 33 adopts a truncated cone structure transition, the upper end of the pressure relief cavity 33 is connected to the exhaust cavity 13 in the pot cover 2, and a sealing ring 30 is installed in the contact hole between the pot cover 2 and the piston stirring rod 3 at the upper end of the exhaust cavity 13. The side wall of the exhaust cavity 13 is provided with an exhaust joint 18, and the exhaust joint 18 is connected to the steam supply pipe 20 of the steam generating device 21 through an exhaust hose 19.

[0024] Further, such as Figure 2As shown, a plurality of electric heating tubes 22 are provided at the bottom of the inner cavity of the steam generating device 21, and a steam supply pipe 20, a water supply pipe 23 and a steam pipe 24 are provided at the top of the steam generating device 21. A water supply valve 27 is installed on the water supply pipe 23, and a steam valve 26 is installed on the steam pipe 24. The water supply pipe 23 is used to input reflux water or replenish new water into the steam generating device. The steam pipe 24 is connected to the evaporator and concentration device at the rear end to provide energy for the subsequent processes of firecracker paper production, thereby improving the utilization rate of thermal energy.

[0025] Further, such as Figure 4 As shown, the stirring blade 5 is composed of multiple spiral blades and a mounting sleeve in the middle. The mounting sleeve in the middle of the stirring blade 5 is mounted on the piston stirring rod 3. The mounting sleeve and the piston stirring rod 3 are clearance-matched. The upper and lower ends of the mounting sleeve are respectively clamped into the retaining spring groove of the piston stirring rod 3 through a retaining spring 34 for limiting.

[0026] Furthermore, the number of counterweights 15 placed on the support blocks 29 at the top of multiple piston stirring rods 3 can be set to the same, or different numbers of counterweights 15 can be set, so that the piston stirring rods 3 at different positions rise to different heights, thereby achieving a better material mixing effect. By adjusting the weight of the counterweights 15, the adjustment of different air pressures inside the cooking pot body 1 can be achieved.

[0027] Furthermore, a vacuum chamber 7 is provided on the side wall of the cooking pot body 1, and the vacuum chamber 7 is located outside the heating chamber 6. The vacuum chamber 7 is connected to the vacuum pump through an exhaust pipe 16, and a pressure maintaining valve 17 is installed on the exhaust pipe 16. By evacuating the vacuum chamber 7, a heat preservation effect is achieved.

[0028] Furthermore, a heat-insulating cavity 25 is provided on the side wall of the steam generating device 21 . The heat-insulating cavity 25 is provided to keep the steam generating device 21 warm.

[0029] Furthermore, the interior of the electric heating tube 22 is a resistance wire, and the exterior of the resistance wire is sheathed with a metal sleeve. When the electric heating tube 22 is energized, the resistance wire inside it generates heat to heat the interior of the steam generating device 21, thereby generating steam.

[0030] Further, such as Figure 5 As shown, two lifting ears 14 are provided on both sides of the top of the pot cover 2, which can be directly lifted by a lifting device to facilitate adding or discharging materials into the cooking pot body 1. Similarly, the cooking pot body 1 can also be provided with a lifting ear structure on the side wall to facilitate the side dumping of materials from the cooking pot body 1.

[0031] Working process: add raw materials into the cooking pot body 1, cover the pot lid 2, and fix the two by the snap-fit ​​structure at the connecting flange position, configure the number of counterweights on the piston stirring rod 3, and then energize the side heating resistance wire 8 and the bottom heating resistance wire 9 in the cooking pot body 1 for heating, so that the temperature and pressure inside the cooking pot body 1 increase until the internal pressure causes the piston block 4 to push up and relieve the pressure. After the pressure is relieved, the piston stirring rod 3 falls, and the piston stirring rod 3 moves up and down, driving the stirring blade 5 to move up and down. The stirring blade 5 moves relative to the slurry of the fluid inside the pot body, and the stirring blade 5 will be forced to rotate, thereby achieving a better bulking effect, thereby improving the reaction efficiency. The high-temperature gas discharged from the exhaust chamber 13 is transported to the steam generator 21 to ensure the initial temperature inside the steam generator 21 and reduce heat loss. The steam generated by the secondary heating of the steam generator 21 is transported to its subsequent evaporator and concentration device as a heat source.

[0032] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A firecracker paper heat recovery device, comprising a cooking pot body (1) and a pot cover (2), wherein the pot cover (2) is sealed on the cooking pot body (1), a liquid infusion tube (10) is installed on the upper side wall of the cooking pot body (1), a liquid infusion pump (11) and a liquid infusion valve (12) are installed on the liquid infusion tube (10), a hollow heating chamber (6) is provided at the bottom and side wall of the cooking pot body (1), a bottom heating resistance wire (9) is installed in the bottom heating chamber (6), and a side heating resistance wire (8) is installed in the side wall heating chamber (6), characterized in that: The pot cover (2) is provided with a plurality of stirring and pressure regulating mechanisms, which include a regulating cylinder (4) installed at the bottom of the pot cover (2) and a piston stirring rod (3) inserted in the regulating cylinder (4). The inside of the regulating cylinder (4) is sequentially provided with a contraction chamber (31), a piston chamber (32) and a pressure relief chamber (33) from bottom to top. The diameters of the contraction chamber (31), the piston chamber (32) and the pressure relief chamber (33) are sequentially increased. The piston stirring rod (3) is provided with a stirring blade (5), a piston block (28) and a support block (29). The piston block (28) is installed in the piston chamber (32). The piston block (28) is sealed against the side wall of the piston chamber (32), and the piston block (28) can be moved up and down along the piston chamber (32) under the action of an external force. The stirring blade (5) is installed on the portion of the bottom end of the piston stirring rod (3) inserted into the cooking pot body (1). Each piston stirring rod (3) is provided with a plurality of stirring blades (5), and the stirring blades (5) can be rotatably arranged relative to the piston stirring rod (3); the support block (29) is provided at the upper end portion of the piston stirring rod (5) extending out of the pot cover (2); and a plurality of annular counterweights (15) sleeved on the piston stirring rod (3) are placed on the support block (29); the connection position between the piston chamber (32) and the pressure relief chamber (33) adopts a truncated cone structure transition; the upper end of the pressure relief chamber (33) is connected to the exhaust chamber (13) in the pot cover (2); a sealing ring (30) is installed in the contact hole between the pot cover (2) and the piston stirring rod (3) at the upper end of the exhaust chamber (13); a steam exhaust joint (18) is provided on the side wall of the exhaust chamber (13); and the steam exhaust joint (18) is connected to the steam supply pipe (20) of the steam generating device (21) through an exhaust hose (19).

2. The firecracker paper heat recovery device according to claim 1, characterized in that: A plurality of electric heating pipes (22) are provided at the bottom of the inner cavity of the steam generating device (21), and a steam supply pipe (20), a water supply pipe (23) and a steam pipe (24) are provided at the top of the steam generating device (21). A water supply valve (27) is installed on the water supply pipe (23), and a steam valve (26) is installed on the steam pipe (24).

3. The firecracker paper heat recovery device according to claim 2, characterized in that: The stirring blade (5) is composed of a plurality of spiral blades and a mounting sleeve in the middle. The mounting sleeve in the middle of the stirring blade (5) is mounted on the piston stirring rod (3). The mounting sleeve and the piston stirring rod (3) are clearance-matched. The upper and lower ends of the mounting sleeve are respectively clamped into the retaining spring groove of the piston stirring rod (3) through a retaining spring (34) for positioning.

4. The firecracker paper heat recovery device according to claim 3, characterized in that: The number of counterweights (15) placed on the support blocks (29) at the tops of the plurality of piston stirring rods (3) is the same.

5. The firecracker paper heat recovery device according to claim 4, characterized in that: The side wall of the cooking pot body (1) is further provided with a vacuum chamber (7), the vacuum chamber (7) being located outside the heating chamber (6), the vacuum chamber (7) being connected to a vacuum pump via an exhaust pipe (16), and a pressure-maintaining valve (17) being installed on the exhaust pipe (16).

6. The firecracker paper heat recovery device according to claim 5, characterized in that: A heat-insulating cavity (25) is provided on the side wall of the steam generating device (21).

7. The firecracker paper heat recovery device according to claim 6, characterized in that: The electric heating tube (22) has a resistance wire inside and a metal sheath outside the resistance wire.

8. The firecracker paper heat recovery device according to claim 7, characterized in that: Two lifting ears (14) are provided on both sides of the top of the pot cover (2).

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