Continuous working steam box system convenient for waste heat recovery

Abstract

The utility model discloses a continuous working steam box system convenient for waste heat recovery, which comprises a steam box, a conveying line, a sealing structure, a heating steam path and a waste heat recovery steam path, and is characterized in that the conveying line movably penetrates through the steam box; sealing structures are arranged at the steam box inlet and outlet positions of the conveying line; the steam box is communicated with a heating steam path and a waste heat recovery steam path; the sealing structure comprises a sealing box and a sealing steam valve. The sealing box comprises a shell top, a front wall, a rear wall, sealing teeth, a sealing steam injection pipe and a temperature sensor. The front wall is fixedly connected with the steam box and connected with inner sealing teeth, and the inner sealing teeth are located in the sealing box; the rear wall is connected with outer sealing teeth which are positioned in the sealing box or extend out of the sealing box; the sealing steam valve is communicated with the sealing steam injection pipe and the heating steam path. According to the description of the scheme, the system has the beneficial effects that the parameter quality of dead steam of the steam box can be effectively improved by adopting an end labyrinth sealing and steam injection isolation mode, the heat of the steam box is better recovered, and the steam energy consumption cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of thermal energy utilization technology, and in particular to a continuous working steam oven system that facilitates waste heat recovery. Background Technology

[0002] Steamers are crucial equipment in the instant noodle processing industry, using steam to heat and gelatinize noodles. Because the waste steam contains air, it cannot be directly recycled and is currently emitted directly into the atmosphere through chimneys. To improve energy efficiency in instant noodle processing, the waste steam heat utilization method involves first exchanging heat between the waste steam and negative-pressure purified water in a heat exchanger. Then, the steam generated from the negative-pressure purified water is compressed to produce high-pressure pure steam for utilization. However, the air content in the waste steam affects the heat exchange efficiency. A 30% air volume ratio corresponds to a steam saturation temperature lower than 90℃, and a 53% air volume ratio corresponds to a steam saturation temperature lower than 80℃. Therefore, to improve energy efficiency, measures need to be taken to prevent ambient air from entering the steamer and minimize the air content in the waste steam. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a continuous operating steam chamber system that facilitates waste heat recovery. After use, the waste steam exchanges heat with negative pressure purified water through a heat exchanger, transferring heat to the purified water. The generated new steam meets the purity requirements for use, thus achieving energy-saving effects. The steam chamber is sealed at both ends, reducing the amount of external air entering the chamber and helping to improve the parameter quality of the waste steam, thereby recovering the waste heat of the waste steam more efficiently.

[0004] To achieve the above objectives, this utility model provides a continuous operating steam box system for easy waste heat recovery, including a steam box, a conveyor line, a sealing structure, a heating steam circuit, and a waste heat recovery steam circuit. The conveyor line moves through the steam box; the sealing structure is provided at both the entry and exit points of the conveyor line from the steam box; the steam box is connected to the heating steam circuit and the waste heat recovery steam circuit.

[0005] The sealing structure includes a sealing box, which includes a shell top, a front wall, a rear wall, inner sealing teeth, outer sealing teeth, a sealing steam injection pipe, and a temperature sensor. The front wall is fixedly connected to the steam chamber and is connected to the inner sealing teeth, which are located inside the sealing box. The rear wall is connected to the outer sealing teeth, which are located inside the sealing box or extend outside the sealing box.

[0006] The sealing structure also includes a sealing steam valve, the output end of which is connected to the sealing steam injection pipe, and the input end of which is connected to the heating steam circuit.

[0007] Furthermore, the heating steam circuit includes a steam supply pipe, a pressure reducing valve, an isolation valve, and a steam distribution cylinder connected in sequence. The steam distribution cylinder is connected to the steam inlet valve group, and the steam inlet valve group is connected to the steam box.

[0008] The steam separator is also connected to the sealing steam valve.

[0009] Furthermore, the steam inlet valve assembly includes a front steam inlet valve assembly and a rear steam inlet valve assembly, which are connected in parallel to the steam distribution cylinder.

[0010] Furthermore, the waste heat recovery steam circuit includes a steam exhaust valve, a waste heat recovery unit, and a steam exhaust header connected in sequence, with the inlet of the steam exhaust valve connected to the steam box.

[0011] Furthermore, the exhaust valve includes a front exhaust valve and a rear exhaust valve, which are connected in parallel to the steam chamber and the waste heat recovery unit.

[0012] Furthermore, the distance between the inner sealing teeth and the conveyor line, and the distance between the outer sealing teeth and the conveyor line, are both greater than the height of the material.

[0013] Furthermore, the temperature sensor signal controls and adjusts the sealing steam valve.

[0014] The beneficial effects of this solution can be understood from the description of the above solution, and it has the following advantages:

[0015] (1) Add a sealing structure to the end of the existing steam oven to reduce the amount of external air entering the steam oven;

[0016] (2) By adopting end labyrinth sealing and steam injection isolation, the parameters and quality of the exhaust steam of the steam box can be effectively improved and the heat of the steam box can be better recovered, reducing the cost of steam energy consumption, which has good economic benefits and promotion value;

[0017] (3) When the conveyor belt carries the dough into the steamer, the power it carries will offset part of the positive pressure of the steam valve. However, the large steam discharge of the steam valve will cause steam to leak out from the gap above the dough. Therefore, sealing teeth are set above the dough at both ends of the steamer. By utilizing the aerodynamic principle of the labyrinth seal, the positive pressure of the carried air is maintained while the steam loss between the dough and the sealing teeth is reduced. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system of this utility model;

[0019] Figure 2 This is a schematic diagram of the sealing box structure of this utility model;

[0020] In the diagram, 1. Steam chamber; 2. Conveyor line; 3. Steam supply pipe; 4. Pressure reducing valve; 5. Isolation valve; 6. Steam distributor cylinder; 7. Forward steam valve assembly; 8. Rear steam valve assembly; 9. Front exhaust valve; 10. Rear exhaust valve; 11. Waste heat recovery unit; 12. Exhaust steam header; 13. Sealing box; 14. Shell top; 15. Front wall; 16. Rear wall; 17. Inner sealing teeth; 18. Outer sealing teeth; 19. Temperature sensor; 20. Sealed steam injection pipe; 21. Sealed steam valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] like Figure 1 As shown, this embodiment discloses a continuous operating steaming box system for easy waste heat recovery, including a steaming box 1, a conveyor line 2, a sealing structure, a heating steam circuit, and a waste heat recovery steam circuit. The conveyor line 2 moves through the steaming box 1, and the steaming box 1 is connected to the heating steam circuit and the waste heat recovery steam circuit. The steaming box 1 has an open structure and operates at atmospheric pressure. The bottom is the conveyor line 2, which transports the dough into the steaming box 1 according to a certain process, processes it, and then transports it out of the steaming box 1.

[0023] The heating steam circuit includes a steam supply pipe 3, a pressure reducing valve 4, an isolation valve 5, and a steam distribution cylinder 6 connected in sequence. The steam distribution cylinder 6 is connected to the forward steam valve group 7 and the rear steam valve group 8, which in turn are connected to the steam chamber 1. Steam enters the steam distribution cylinder 6, a horizontal cylindrical container, through the steam supply pipe 3, pressure reducing valve 4, and isolation valve 5; then, it enters the steam chamber 1 through the forward steam valve group 7 and the rear steam valve group 8. The heating steam source is generally the initial steam produced by the boiler.

[0024] The waste heat recovery steam circuit includes a front exhaust valve 9, a rear exhaust valve 10, a waste heat recovery unit 11, and an exhaust header 12. The front exhaust valve 9 and the rear exhaust valve 10 are connected to the steam chamber 1. The output ends of the front exhaust valve 9 and the rear exhaust valve 10 are connected to the waste heat recovery unit 11, and the waste heat recovery unit 11 is connected to the exhaust header 12. Exhaust steam enters the waste heat recovery unit 11 through the front exhaust valve 9 and the rear exhaust valve 10 respectively, recovers heat, and then enters the exhaust header 12 for discharge.

[0025] like Figure 2As shown, sealing structures are installed at both the inlet and outlet of the conveyor line 2 and the steamer 1. The sealing structure includes a sealing box 13, which is a square, inverted box-like structure comprising a top 14, a front wall 15, a rear wall 16, inner sealing teeth 17, outer sealing teeth 18, a temperature sensor 19, and a sealed steam injection pipe 20. The front wall 15 is completely fitted to the steamer 1, fixed to it using a spot-welded or cantilevered structure. The front wall 15 is connected to the inner sealing teeth 17, which are located inside the sealing box 13 and can be a smooth seal as needed. The sealing structure utilizes the gap between the comb teeth to create a throttling effect on the gas, achieving a sealing function. A certain gap is reserved between the bottom of the comb teeth and the conveyor belt to ensure that the dough can pass smoothly without contacting the comb teeth. The rear wall 16 is connected to an outer sealing tooth 18. The outer sealing tooth 18 can be of different forms, such as extended or built-in. The length of the sealing section of the comb tooth is selected according to the sealing requirements. When it is necessary to reduce air leakage, the sealing section length is increased, and vice versa. The distance between the inner sealing tooth 17 and the outer sealing tooth 18 and the conveyor line 2 is greater than the height of the material. This ensures that the material is neither obstructed nor damaged. Since the conveyor line 2 and the material are equivalent to a plane, the inner sealing tooth 17 and the outer sealing tooth 18 are equivalent to a smooth labyrinth seal structure with respect to the conveyor line 2 and the material. Due to the aerodynamic principle of the labyrinth seal structure, it will impede the gas flow in the gap between the material and the inner sealing tooth 17 and the outer sealing tooth 18.

[0026] The steam injection pipe 20 can be adjusted to adjust the steam injection direction. It can be adjusted to the end of the outer sealing tooth 18 so that the steam can be directed towards the direction of steam leakage from the steam chamber 1. The steam injection flow rate can be adjusted to blow as much as possible through the gaps in the dough and the gap between the outer sealing tooth 18 and the dough, thereby reducing the possibility of external air entering the steam chamber 1.

[0027] The sealing steam valve 21 has its input end connected to the steam distributor 6 and its output end connected to the sealing steam injection pipe 20. Two streams of sealing steam are branched off from the steam distributor 6 and enter the sealing chambers 13 at both ends of the steam chamber 1. The sealing steam valve 21 is a pneumatic regulating valve, and its opening is controlled by a signal from a temperature sensor 19 to regulate the steam flow rate. The temperature sensor 19 is installed inside the sealing chamber 13 to measure the gas temperature inside. When the measured steam temperature is too low, it indicates that outside air has entered the sealing chamber 13 through the end sealing teeth, resulting in insufficient sealing steam flow. By feeding back the temperature signal to the sealing steam valve 21 controller, the valve opening is increased to raise the steam temperature inside the sealing chamber.

[0028] The technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A continuously operating steaming tank system facilitating waste heat recovery, characterized in that, The steam box, the conveying line, the sealing structure, the heating steam path and the waste heat recovery steam path are included, the conveying line moves through the steam box, the sealing structure is arranged at the inlet and outlet of the conveying line, the steam box is connected with the heating steam path and the waste heat recovery steam path, The sealing structure includes a sealing box, the sealing box includes a shell top, a front wall, a rear wall, inner sealing teeth, outer sealing teeth, a sealing steam injection pipe and a temperature sensor, the front wall is fixedly connected with the steam box, the front wall is connected with the inner sealing teeth, the inner sealing teeth are located in the sealing box, the rear wall is connected with the outer sealing teeth, and the outer sealing teeth are located in the sealing box or extend out of the sealing box, The sealing structure further includes a sealing steam valve, the output end of the sealing steam valve is connected with the sealing steam injection pipe, and the input end of the sealing steam valve is connected with the heating steam path.

2. A continuous operation steamer system with ease of waste heat recovery as claimed in claim 1 wherein, The heating steam path includes a steam supply pipe, a pressure reducing valve, an isolation valve and a steam distribution cylinder which are sequentially connected, the steam distribution cylinder is connected with a steam inlet valve group, and the steam inlet valve group is connected with the steam box. The steam distribution cylinder is further connected with the sealing steam valve.

3. A continuous operation steamer system with ease of waste heat recovery as claimed in claim 2 wherein, The steam inlet valve group includes a front steam inlet valve group and a rear steam inlet valve group which are connected in parallel with the steam distribution cylinder.

4. The continuous operation steamer system with waste heat recovery of claim 1, wherein, The waste heat recovery steam path includes a steam exhaust valve, a waste heat recovery device and a steam exhaust main pipe which are sequentially connected, and the inlet of the steam exhaust valve is connected with the steam box.

5. A continuous operation steamer system with ease of waste heat recovery as claimed in claim 4 wherein, The steam exhaust valve includes a front steam exhaust valve and a rear steam exhaust valve which are connected in parallel with the steam box and the waste heat recovery device.

6. The continuous operation steamer system with waste heat recovery of claim 1, wherein, The distance between the inner sealing teeth and the conveying line and the distance between the outer sealing teeth and the conveying line are both greater than the height of the material.

7. The continuous operation steamer system with waste heat recovery of claim 1, wherein, The temperature sensor signal controls and adjusts the sealing steam valve.

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