Efficient and energy-saving heat supply system of hot press

Abstract

The utility model relates to the technical field of hot presses, and discloses an efficient and energy-saving heat supply system of a hot press, which comprises a boiler, the hot press, a primary heat exchanger and a secondary heat exchanger, hot water produced by the boiler is processed by a steam-water separator and then pumped into the hot press through a first water pump, and the water outlet end of the hot press is connected with a hot water storage tank. The water outlet end of the hot water storage tank is connected with a first-stage heat exchanger through a second water pump, a high-temperature flue gas pipe is connected between the boiler and the first-stage heat exchanger, and the first-stage heat exchanger is connected with the hot press through a water return pipeline; the first-stage heat exchanger is connected with the second-stage heat exchanger through a medium-temperature flue gas pipeline, the second-stage heat exchanger is connected with the cold water tank, the water outlet end of the cold water tank is connected with a second water pump, the second-stage heat exchanger is connected with the boiler through a water circulating pipeline, and cold water enters the boiler after being heated by flue gas of the second-stage heat exchanger. The hot press provided by the utility model adopts hot water to supply heat, is safe to use, and can fully recover flue gas waste heat and reduce energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of hot presses, and particularly relates to a heat supply system for an energy-efficient hot press. Background Art

[0002] During the hot pressing process of the slab in the hot press, supplying heat to the hot press plate is an important technological condition. The existing heat supply commonly used in production lines is mainly hot oil heat supply, but hot oil heat supply is prone to blockage and has low safety. Currently, a heat supply method using hot water to replace hot oil has gradually emerged. For example, the Chinese utility model patent with the patent publication number CN 211823151 U discloses an energy-saving heat supply device for a bamboo hot press, which adopts, including a hot press for heating bamboo, a boiler for producing heat, a conveying pipeline for sending the hot water produced by the boiler into the hot press to heat the hot press, a return water pipeline for sending the water heated by the hot press back to the boiler for continuous heating, and a water pump for sending the hot water of the boiler to the hot press. The boiler, the conveying pipeline, the hot press, and the return water pipeline form a circulating loop. It uses hot water for heat supply and has high safety during heating. However, the flue gas of the boiler is not fully utilized, and the entire system is not energy-efficient enough. Summary of the Utility Model

[0003] The purpose of the present utility model is to solve the above problems, and provide a heat supply system for an energy-efficient hot press. The hot press uses hot water for heat supply, which has high safety during heating and can fully utilize the flue gas of the boiler, making the entire system more energy-efficient.

[0004] To achieve the above purpose, the technical solution adopted by the present utility model is as follows: A heat supply system for an energy-efficient hot press, including a boiler. The hot water produced by the boiler is sent into the hot press through a water conveying pipeline after being treated by a steam-water separator. A first water pump is provided on the water conveying pipeline. It also includes a primary heat exchanger and a secondary heat exchanger. The water outlet end of the hot press is connected to a hot water storage tank. The water outlet end of the hot water storage tank is connected to the primary heat exchanger through a second water pump. A high-temperature flue gas pipe is connected between the boiler and the primary heat exchanger. The primary heat exchanger is connected to the hot press through a return water pipeline, and the water coming out of the hot press is heat-exchanged with high-temperature flue gas in the primary heat exchanger. The primary heat exchanger is connected to the secondary heat exchanger through a medium-temperature flue gas pipe. The secondary heat exchanger is connected to a cold water tank. The water outlet end of the cold water tank is connected with a second water pump. The secondary heat exchanger is connected to the boiler through a water circulation pipeline. In the secondary heat exchanger, medium-temperature flue gas is used to heat-exchange with the cold water in the cold water tank, so that the cold water is heated and then enters the boiler.

[0005] Further, a dust removal cloth bag is provided on the medium-temperature flue gas pipe.

[0006] Further, the primary heat exchanger includes an inner tube body, a middle tube body, and an outer tube body, and a spiral water flow channel is provided between the middle tube body and the inner tube body.

[0007] Further, high-temperature resistant and anti-corrosion coatings are applied to the inner surfaces of the inner tube body and the outer tube body.

[0008] Further, water flow control valves are provided at the water outlet ends of the first water pump, the second water pump, the third water pump, and the hot press, and a flue gas flow control valve is provided at the high-temperature flue gas inlet end of the primary heat exchanger.

[0009] Further, the water outlet end of the primary heat exchanger is connected to the hot press and the boiler respectively through a three-way valve, and a temperature monitor is provided on the pipeline at the water outlet end of the primary heat exchanger.

[0010] Due to the adoption of the above technical solution, the present utility model has the following beneficial effects:

[0011] The hot press of the present utility model uses hot water for heating, with high safety in use. Moreover, by setting a primary heat exchanger and a secondary heat exchanger, the waste heat of the flue gas is recycled in a hierarchical manner. In the primary heat exchanger, the high-temperature flue gas is used to exchange heat with the water coming out of the hot press, so that the water temperature rises and then returns to the hot press through the return water pipeline for recycling; in the secondary heat exchanger, the medium-temperature flue gas is used to exchange heat with the cold water in the cold water tank, so that the cold water is heated and then enters the boiler to supplement the boiler water, increasing the temperature of the water entering the boiler and making the system more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of a heat supply system for an efficient and energy-saving hot press of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the primary heat exchanger of the present utility model;

[0014] In the figure: 1 - boiler, 2 - steam-water separator, 3 - hot press, 4 - hot water storage tank, 5 - primary heat exchanger, 51 - inner tube body, 52 - middle tube body, 53 - outer tube body, 54 - high-temperature resistant and anti-corrosion coating, 6 - dust removal cloth bag, 7 - secondary heat exchanger, 8 - cold water tank, 9 - first water pump, 10 - second water pump, 11 - third water pump, 12 - three-way valve, 13 - water flow control valve, 14 - flue gas flow control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish different objects and are not used to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0016] As mentioned herein, "embodiment" means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present utility model. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] As Figure 1 shown, a heat supply system for an efficient and energy-saving hot press 3 includes a boiler 1, a hot press 3, a primary heat exchanger 5 and a secondary heat exchanger 7. The hot water produced by the boiler 1 is sent into the hot press 3 through a water delivery pipeline after being treated by a steam-water separator 2. A first water pump 9 is provided on the water delivery pipeline. The water outlet end of the hot press 3 is connected to a hot water storage tank 4. The water outlet end of the hot water storage tank 4 is connected to the primary heat exchanger 5 through a second water pump 10. A high-temperature flue gas pipe is connected between the boiler 1 and the primary heat exchanger 5. The primary heat exchanger 5 is connected to the hot press 3 through a return water pipeline. In the primary heat exchanger 5, the water coming out of the hot press 3 is heated by high-temperature flue gas; the primary heat exchanger 5 is connected to the secondary heat exchanger 7 through a medium-temperature flue gas pipe. The secondary heat exchanger 7 is connected to a cold water tank 8. The water outlet end of the cold water tank 8 is connected to a second water pump 10. The secondary heat exchanger 7 is connected to the boiler 1 through a water circulation pipeline. In the secondary heat exchanger 7, medium-temperature flue gas is used to exchange heat with the cold water in the cold water tank 8, so that the cold water is heated and then enters the boiler 1.

[0018] A dust removal cloth bag 6 is provided on the medium-temperature flue gas pipe. It can remove the dust in the flue gas, avoid dust deposition in the secondary heat exchanger 7, and reduce the heat exchange efficiency.

[0019] AsFigure 2 As shown in the figure, the primary heat exchanger 5 includes an inner tube body 51, a middle tube body 52, and an outer tube body 53. A spiral water flow channel is provided between the middle tube body 52 and the inner tube body 51. The inner surfaces of the inner tube body 51 and the outer tube body 53 are both coated with a high-temperature and corrosion-resistant coating 54. During use, flue gas is introduced into the inner pipe and the outer pipe to increase the contact area, improve the heat exchange efficiency, and reduce energy loss. The inner pipe and the outer pipe are straight pipes, which is convenient for manual cleaning of the deposited dust.

[0020] Water flow control valves 13 are provided at the water outlet ends of the first water pump 9, the second water pump 10, the third water pump 11, and the hot press 3, and a flue gas flow control valve 14 is provided at the high-temperature flue gas inlet end of the primary heat exchanger 5. Both the water flow control valve 13 and the flue gas flow control valve 14 can be electromagnetic valves, which is convenient for remote control.

[0021] The water outlet end of the primary heat exchanger 5 is respectively connected to the hot press 3 and the boiler 1 through a three-way valve 12, and a temperature monitor is provided on the pipeline at the water outlet end of the primary heat exchanger 5.

[0022] During use, the boiler 1 heats water to produce high-temperature water that meets the heating temperature of the hot press 3. The high-temperature water is sent into each heating cavity of the hot press 3 through the first water pump 9 via a conveying pipeline to heat each layer of hot-pressed plates. The high-temperature water coming out of the hot press 3 is stored in the hot water storage tank 4 and pumped into the primary heat exchanger 5 through the second water pump 10 to exchange heat with the high-temperature flue gas generated by the boiler 1. The high-temperature flue gas is used to heat the high-temperature water coming out of the hot press 3. The high-temperature water reaching the use temperature of the hot press 3 returns to the hot press 3 through the return pipeline for cyclic use. If the temperature does not meet the use requirements, it is sent back into the boiler 1 to continue heating and cyclic utilization; the medium-temperature flue gas coming out of the primary heat exchanger 5 is secondarily reused in the secondary heat exchanger 7. In the secondary heat exchanger 7, the medium-temperature flue gas is used to exchange heat with the cold water in the cold water tank 8, and the medium-temperature flue gas is used to heat the cold water replenished into the boiler 1 to increase the temperature of the water entering the boiler 1. The flue gas cooled by the secondary heat exchanger 7 can be treated by a flue gas treatment device and then discharged into the air. The hot press 3 of the present utility model uses hot water for heating, with high heating safety, and the waste heat of the flue gas is recycled in a hierarchical manner, improving the utilization rate of thermal energy.

[0023] The above has generally described the present utility model in detail. However, based on the present utility model, some modifications or improvements can be made, which are obvious to those of ordinary skill in the technical field. Therefore, modifications or improvements made without departing from the spirit of the present utility model are within the protection scope of the present utility model.

Claims

1. A heat supply system for a highly efficient and energy-saving hot press, comprising a boiler, wherein the hot water produced by the boiler is treated by a steam-water separator and then fed into the hot press through a water delivery pipeline, wherein a first water pump is provided on the water delivery pipeline, and wherein: It also includes a primary heat exchanger and a secondary heat exchanger. The water outlet of the heat press is connected to the hot water storage tank, and the water outlet of the hot water storage tank is connected to the primary heat exchanger through a second water pump. A high-temperature flue gas pipe is connected between the boiler and the primary heat exchanger. The primary heat exchanger is connected to the heat press through a return pipe, and the high-temperature flue gas is used to exchange heat with water coming out of the heat press in the primary heat exchanger; the primary heat exchanger is connected to the secondary heat exchanger through a medium-temperature flue gas pipe, and the secondary heat exchanger is connected to a cold water tank. The water outlet of the cold water tank is connected to a second water pump, and the secondary heat exchanger is connected to the boiler through a water circulation pipe. The medium-temperature flue gas is used to exchange heat with the cold water in the cold water tank in the secondary heat exchanger, so that the cold water enters the boiler after being heated.

2. The heat supply system of a high-efficiency and energy-saving hot press according to claim 1, characterized in that: The medium-temperature flue gas duct is provided with a dust removal bag.

3. The heat supply system of a high-efficiency and energy-saving hot press according to claim 1, characterized in that: The primary heat exchanger comprises an inner tube body, a middle tube body and an outer tube body, and a spiral water flow channel is provided between the middle tube body and the inner tube body.

4. The heat supply system of a high-efficiency and energy-saving hot press according to claim 3 is characterized in that: The inner surfaces of the inner tube body and the outer tube body are coated with high temperature resistant anti-corrosion coatings.

5. The heat supply system of a high-efficiency and energy-saving hot press according to claim 1, characterized in that: The water outlets of the first water pump, the second water pump, the third water pump and the hot press are provided with water flow control valves, and the high-temperature flue gas inlet of the primary heat exchanger is provided with a flue gas flow control valve.

6. The heat supply system of a high-efficiency and energy-saving hot press according to claim 1, characterized in that: The water outlet end of the primary heat exchanger is connected to the hot press and the boiler respectively through a three-way valve, and a temperature monitor is provided on the water outlet pipe of the primary heat exchanger.

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