Steam backwater energy-saving device for paperboard production line
By designing steam return water energy-saving devices for steam separation and waste heat utilization in the cardboard production line, the problems of low steam utilization and water vapor loss are solved, and efficient energy utilization and boiler life are achieved.
Patent Information
- Application Number
- CN202420616625.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The steam utilization rate in the existing cardboard production lines is low, ignoring water vapor loss, resulting in the boiler needing to consume more energy for heating, increasing energy costs, and direct emission of high-temperature condensate wastes resources.
A steam return water energy-saving device is designed. Through steam and water separation and waste heat utilization, high-temperature condensate and steam are preheated. The room temperature water in the water filling pipe is preheated. The high-temperature steam is preheated to be added through the waste heat utilization device, which increases the steam Utilization rate and reduce air pressure in the boiler.
It reduces the energy consumption of boiler heating, improves the utilization rate of steam waste heat, extends the service life of the boiler, and avoids the increase in boiler power caused by steam loss, reducing energy waste.
Smart Images
Figure CN222297898U_ABST
Abstract
Description
Technical Field
[0001] This utility model patent belongs to the technical field of waste heat recovery in cardboard processing, and specifically relates to a steam return water energy-saving device for a cardboard production line. Background Art
[0002] During the production process of paperboard, the steam generated in the boiler needs to be transported to the preheating cylinder in the production line through the steam pipe. The surface paper, lining paper, etc. are pre-dried in the preheating cylinder to evaporate their moisture, thereby adjusting the temperature of the paper web, reducing the moisture content of the paper web and making it uniform, and adjusting the tension of the paper web during operation so that it can be well bonded with the corrugated core paper. The used steam is usually discharged into the return water system for utilization, and after the steam is discharged, part of it will cool down in the pipeline to form high-temperature condensed water, while the other part of the steam remains unchanged, and after being discharged and cooled, it forms high-temperature condensed water and high-temperature steam. Both contain extremely high heat, and direct discharge wastes energy, which is contrary to the current concept of energy conservation and emission reduction, and also increases the operating costs of enterprises.
[0003] In the prior art, for example, the boiler return water system on the paperboard production line disclosed in the Chinese patent (CN202328169U) concentrates the condensed water and part of the residual steam discharged from the steam heater use point through the steam trap into a sealed container, and then transports it into the boiler through a high-pressure pump, and part of the residual steam can be discharged from the exhaust valve; although this method reuses the condensed water, the steam in the high-pressure heart pump can cause cavitation of the pump to reduce its service life, and because part of the high-temperature water vapor in the exhaust pipe will also be discharged into the boiler with the condensed water and part of the residual steam will be discharged from the exhaust valve, so that the temperature of the exhaust end of the steam heater in the system will lose too fast, the steam flow rate at the exhaust end will increase, and the steam utilization rate in the steam heater will be low, and then the boiler heating power needs to be increased, resulting in energy waste; at the same time, as the residual steam recovery device of a paperboard production line disclosed in the Chinese patent (CN205535753U), both of them ignore the loss of water vapor during the operation of the production line, and when it is necessary to add water to the boiler, the water at room temperature will reduce the temperature of the boiling water in the boiler, resulting in the boiler consuming more energy for heating, increasing energy costs.
[0004] In the prior art, as described in the Chinese patent (CN209910018U) on the condensate water heating energy-saving system for a paperboard production line, an inlet pipeline, a heating terminal, a return pipeline and a circulation pump are connected in sequence, a plate heat exchanger is arranged on the return pipeline, the heating terminal, the plate heat exchanger and the circulation pump are connected in sequence to form a closed heating circulation water circuit, the high-temperature condensate discharged from the paperboard production line is connected to another medium fluid channel of the plate heat exchanger, the high-temperature condensate outlet of the plate heat exchanger is connected to the top inlet of the condensate water tank; the bottom outlet of the condensate water tank is connected to the top inlet of the booster water tank through a backflow pump, and the bottom outlet of the booster water tank is connected to the return pipeline through a booster pump; this system is suitable for areas in northern my country where the winter is cold, while some areas in southern my country where the temperature difference between the four seasons is not large, no heating device is required, so discharging high-temperature condensate will only cause a waste of resources.
[0005] Therefore, this paper proposes a steam return water energy-saving device for a cardboard production line. Utility Model Content
[0006] In order to solve the above problems, the utility model is implemented through the following technical solutions: a steam return water energy-saving device for a paperboard production line, comprising a boiler, an air intake pipe, and a steam heater. The boiler is connected to the air intake end of the steam heater through the air intake pipe at its top end. The steam heater is connected to an exhaust water return device that can perform steam-water separation and waste heat utilization. The rear end of the exhaust water return device is connected to the rear side of a water adding pipe. A booster pump is installed on the front side of the water adding pipe. The rear end of the water adding pipe is connected to the water adding port of the boiler. A one-way valve is also provided on the water adding pipe on the rear side of the booster pump.
[0007] Preferably, the exhaust and water return device also includes an exhaust pipe A, a steam-water separation valve, a water return pipe, and a steam waste heat utilization device. The front end of the exhaust pipe A is connected to the exhaust port A of the steam heater, the steam-water separation valve is connected to the rear end of the exhaust pipe A, the drain outlet of the steam-water separation valve is connected to the front end of the water return pipe, the rear end of the water return pipe is connected to the water supply pipe on the rear side of the booster pump, the air inlet end of the steam waste heat utilization device is connected to the exhaust port B of the steam-water separation valve through the exhaust pipe B, and the steam waste heat utilization device is wrapped around the outside of the water supply pipe, and the exhaust port of the steam waste heat utilization device is connected to the exhaust pipe A on the front side of the steam-water separation valve through the air return pipe.
[0008] Preferably, the steam waste heat utilization device comprises an insulated heat-conducting pipe and a spiral waste heat utilization channel. The insulated heat-conducting pipe is wrapped around the outside of the water supply pipe. A spiral waste heat utilization channel through which water vapor can pass is arranged in the heat-conducting inner wall of the insulated heat-conducting pipe. The front and rear ends of the waste heat utilization channel are respectively connected to the return air pipe and the exhaust pipe B.
[0009] Preferably, a thermal insulation outer wall is further provided on the outer side of the thermal insulation inner wall of the thermal insulation pipe.
[0010] Preferably, a one-way valve is installed on the air return pipe and the water return pipe.
[0011] Preferably, the outer sides of the boiler, air inlet pipe, exhaust pipe A, steam-water separation valve, water return pipe, exhaust pipe B, and air return pipe are all wrapped with insulation materials.
[0012] The beneficial effects of the utility model are:
[0013] The device adopts an exhaust water return device to separate the high-temperature condensed water and high-temperature steam formed after cooling. The high-temperature condensed water can enter the water adding pipe through the return water pipe to preheat the normal temperature water in the water adding pipe to be added. At the same time, the high-temperature steam can enter the steam waste heat utilization device through the exhaust pipe B to be preheated to wait for water to be added. This can reduce the consumption of boiler heating energy. At the same time, the high-temperature condensed water and high-temperature steam formed after the waste heat utilization can enter the steam-water separation valve from the exhaust pipe A again for separation, which improves the utilization rate of the waste heat in the remaining steam. The steam and high-temperature condensed water circulating therein can also reduce the air pressure in the boiler and extend the service life of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for describing the embodiment will be briefly introduced below. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.
[0015] Figure 1 It is a structural diagram of the utility model;
[0016] Figure 2 It is a cross-sectional schematic diagram of the main view of the utility model;
[0017] Figure 3 It is a schematic diagram of the frame line of the utility model;
[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0019] 1. Boiler; 2. Air inlet pipe; 3. Steam heater; 4. Water supply pipe; 5. Booster pump; 6. Exhaust pipe A; 7. Steam-water separation valve; 8. Return pipe; 9. Exhaust port A; 10. Exhaust pipe B; 11. Exhaust port B; 12. Return pipe; 13. Waste heat utilization channel; 14. Heat-conducting inner wall; 15. Heat-insulating outer wall; 16. One-way valve. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0021] like Figures 1 to 3 As shown, the prior art in this embodiment has the following problems: the inventors found that in the prior art, the steam utilization rate of the paperboard production line is low, and the loss of water vapor during the operation of the production line is ignored. When water needs to be added to the boiler 1, the water at room temperature will reduce the temperature of the boiling water in the boiler 1, resulting in the boiler 1 consuming more energy for heating, which increases the energy cost;
[0022] Therefore, the inventor provides a steam return water energy-saving device for a cardboard production line, comprising a boiler 1, an air intake pipe 2, and a steam heater 3. The boiler 1 is connected to the air intake end of the steam heater 3 through the air intake pipe 2 at the top thereof, and the steam heater 3 is connected to an exhaust water return device which can perform steam-water separation and waste heat utilization. The rear end of the exhaust water return device is connected to the rear side of a water adding pipe 4, a booster pump 5 is installed on the front side of the water adding pipe 4, and the rear end of the water adding pipe 4 is connected to the water adding port of the boiler 1. A one-way valve 16 is also provided on the water adding pipe 4 on the rear side of the booster pump 5.
[0023] The effect and principle are as follows: the device uses an exhaust water return device to separate the high-temperature condensed water and high-temperature steam formed after cooling. The high-temperature condensed water can enter the water adding pipe 4 through the water return pipe 8 to preheat the normal temperature water in the water adding pipe 4 to be added. At the same time, the high-temperature steam can enter the steam waste heat utilization device through the exhaust pipe B10 to be preheated to be added with water. This can reduce the consumption of heating energy of the boiler 1. At the same time, the high-temperature condensed water and high-temperature steam formed after the waste heat utilization can enter the steam-water separation valve 7 from the exhaust pipe A6 again for separation, thereby improving the utilization rate of the waste heat in the remaining steam. The steam and high-temperature condensed water circulating therein can also reduce the air pressure in the boiler 1 and extend the service life of the boiler 1.
[0024] Furthermore, the exhaust and water return device also includes an exhaust pipe A6, a steam-water separation valve 7, a water return pipe 8, and a steam waste heat utilization device. The front end of the exhaust pipe A6 is connected to the exhaust port A9 of the steam heater 3, the steam-water separation valve 7 is connected to the rear end of the exhaust pipe A6, the drain port of the steam-water separation valve 7 is connected to the front end of the water return pipe 8, the rear end of the water return pipe 8 is connected to the water supply pipe 4 on the rear side of the booster pump 5, the air inlet end of the steam waste heat utilization device is connected to the exhaust port B11 of the steam-water separation valve 7 through the exhaust pipe B10, and the steam waste heat utilization device is wrapped around the outside of the water supply pipe 4, and the exhaust port of the steam waste heat utilization device is connected to the exhaust pipe A6 on the front side of the steam-water separation valve 7 through the air return pipe 12; this structure can separate steam and water through the steam-water separation valve 7 and the steam waste heat utilization device and utilize the waste heat. At the same time, it also avoids the increase in boiler 1 power caused by steam loss and reduces energy consumption.
[0025] Furthermore, the steam waste heat utilization device has an insulated heat-conducting pipe and a spiral waste heat utilization channel 13. The insulated heat-conducting pipe is wrapped around the outside of the water-adding pipe 4. The heat-conducting inner wall 14 of the insulated heat-conducting pipe is provided with a spiral waste heat utilization channel 13 through which water vapor can pass. The front and rear ends of the waste heat utilization channel 13 are respectively connected to the return air pipe 12 and the exhaust pipe B10. This structure can utilize the steam separated from the steam-water separation valve 7 for waste heat, and preheat the water to be added at room temperature in the water-adding pipe 4 together with the high-temperature condensed water discharged from the steam-water separation valve 7, thereby reducing the consumption of heating energy of the boiler 1. At the same time, the high-temperature condensed water and high-temperature steam formed after the waste heat utilization can enter the steam-water separation valve 7 from the exhaust pipe A6 for separation again, thereby improving the utilization rate of the waste heat in the remaining steam, and the steam and high-temperature condensed water circulating therein can also relieve the air pressure in the furnace.
[0026] Among them, a heat-insulating outer wall 15 is further arranged outside the heat-conducting inner wall 14 of the heat-insulating heat-conducting pipe; this structure can reduce the heat loss of the residual steam and improve the utilization rate of the residual heat in the residual steam.
[0027] Among them, a one-way valve 16 is installed on the return air pipe 12 and the return water pipe 8; this structure can prevent the steam and water in the exhaust pipe A6 and the water supply pipe 4 from flowing back to the steam-water separation valve 7.
[0028] Furthermore, the outer sides of the boiler 1, the air inlet pipe 2, the exhaust pipe A6, the steam-water separation valve 7, the return pipe 8, the exhaust pipe B10, and the return pipe 12 are all wrapped with thermal insulation materials; this structure can reduce heat consumption and improve steam utilization.
[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A steam return water energy-saving device for a paperboard production line, comprising a boiler (1), an air intake pipe (2), and a steam heater (3), wherein the boiler (1) is connected to the air intake end of the steam heater (3) through the air intake pipe (2) at the top of the boiler (1), and characterized in that: The steam heater (3) is connected to an exhaust water return device capable of performing steam-water separation and waste heat utilization. The rear end of the exhaust water return device is connected to the rear side of a water supply pipe (4). A booster pump (5) is installed on the front side of the water supply pipe (4). The rear end of the water supply pipe (4) is connected to the water supply port of the boiler (1). A one-way valve (16) is also provided on the water supply pipe (4) on the rear side of the booster pump (5).
2. A steam return water energy saving device for a paperboard production line according to claim 1, characterized in that: The exhaust and water return device further comprises an exhaust pipe A (6), a steam-water separation valve (7), a water return pipe (8), and a steam waste heat utilization device. The front end of the exhaust pipe A (6) is connected to the exhaust port A (9) of the steam heater (3), the steam-water separation valve (7) is connected to the rear end of the exhaust pipe A (6), the drain port of the steam-water separation valve (7) is connected to the front end of the water return pipe (8), the rear end of the water return pipe (8) is connected to the water supply pipe (4) on the rear side of the booster pump (5), the air inlet end of the steam waste heat utilization device is connected to the exhaust port B (11) of the steam-water separation valve (7) through the exhaust pipe B (10), and the steam waste heat utilization device is wrapped around the outside of the water supply pipe (4), and the exhaust port of the steam waste heat utilization device is connected to the exhaust pipe A (6) on the front side of the steam-water separation valve (7) through the air return pipe (12).
3. The steam return water energy saving device for a paperboard production line according to claim 2 is characterized by: The steam waste heat utilization device further comprises a heat-insulating heat-conducting pipe and a spiral waste heat utilization channel (13). The heat-insulating heat-conducting pipe is wrapped around the outside of the water supply pipe (4). A spiral waste heat utilization channel (13) through which water vapor can pass is provided in the heat-conducting inner wall (14) of the heat-insulating heat-conducting pipe. The front and rear ends of the waste heat utilization channel (13) are respectively connected to the return air pipe (12) and the exhaust pipe B (10).
4. A steam return water energy saving device for a paperboard production line according to claim 3, characterized in that: A thermal insulation outer wall (15) is also provided outside the thermal insulation inner wall (14) of the thermal insulation heat conduction pipe.
5. The steam return water energy-saving device for a paperboard production line according to claim 3 is characterized by: One-way valves (16) are installed on the air return pipe (12) and the water return pipe (8).
6. The steam return water energy saving device for a paperboard production line according to claim 1 is characterized by: The outer sides of the boiler (1), the air inlet pipe (2), the exhaust pipe A (6), the steam-water separation valve (7), the return pipe (8), the exhaust pipe B (10), and the return pipe (12) are all wrapped with thermal insulation material.