An energy-saving and high-efficiency steam condensate heat pump for papermaking

Abstract

The present invention relates to the field of heat pump technology, specifically to an energy-saving and high-efficiency steam condensate heat pump for papermaking, comprising a pump body, wherein the lower end of the pump body is integrally connected with a regulating chamber, and the lower end face of the regulating chamber is integrally connected with a mixing chamber A, the lower end of the mixing chamber A is integrally connected with a mixing chamber B, and the lower end of the mixing chamber B is fixedly connected with a diffuser; the outer rear end face of the pump body is fixedly connected with a high-pressure steam inlet pipe for high-pressure steam to enter; the outer front end face of the pump body is fixedly connected with an exhaust steam inlet pipe for secondary exhaust steam to enter; the upper end face of the pump body is fixedly connected with a pneumatic regulating device, and the pneumatic regulating device includes a cylinder, a hydraulic cylinder and a push rod. The exhaust steam inlet pipe has a built-in guide plate: the exhaust steam inlet pipe of traditional and existing devices does not have a guide plate. The present invention adds a guide plate, which can reduce the turbulence of the secondary exhaust steam at the elbow, thereby increasing the vacuum effect of the Venturi and increasing the amount of exhaust steam reuse.

Description

Technical Field

[0001] The invention relates to the technical field of heat pumps, and in particular to an energy-saving and high-efficiency steam condensate heat pump for papermaking. Background Art

[0002] A heat pump is a device that transfers heat from a low-temperature heat source to a high-temperature heat source. It is a highly efficient and energy-saving device that fully utilizes low-quality heat energy. The air-energy heat pump water heater widely used in daily life is a typical civil project, and it is also widely used in various heating projects in industry. The principle of an air heat pump is to use electrical energy to drive the refrigerant, concentrate the heat energy in the air that is difficult to use directly through exchange, and apply it to achieve the purpose of energy saving.

[0003] The papermaking heat pump utilizes the Venturi principle to recycle low-quality secondary exhaust steam, thereby achieving energy conservation.

[0004] Because the energy consumption of the paper machine drying section in the papermaking industry accounts for 45% to 55% of the energy consumption in the entire papermaking process, to some extent, the amount of steam consumption has become a key factor that directly affects the profits and competitiveness of papermaking enterprises. Therefore, many domestic paper mills are paying more and more attention to reducing the energy consumption of the drying section to reduce papermaking costs. The quality of the steam condensate system (i.e., paper sheet drying system) in the drying section of the paper machine depends on the effect of the condensate discharge of the drying section of the paper machine and the recycling of the tail gas in the drying section of the paper machine. If the two are not well resolved, the gas consumption per ton of paper of the paper machine will increase significantly, and the operation will be very inconvenient, which will bring a lot of trouble to the entire papermaking production process.

[0005] However, the traditional Venturi-based heat pump has high heat loss during use, and the exhaust steam inlet turbulence causes energy loss. In addition, there is the disadvantage of insufficient mixing between the secondary exhaust steam and the high-pressure steam, and insufficient gas mixing can easily affect the heat recovery efficiency.

[0006] Therefore, an energy-saving and high-efficiency steam condensate heat pump for papermaking is proposed. Summary of the invention

[0007] The object of the present invention is to provide an energy-saving and efficient steam condensate heat pump for papermaking, with a built-in guide plate in the exhaust steam inlet pipe: the exhaust steam inlet pipe of traditional and existing devices has no guide plate. The present invention adds a guide plate to reduce the turbulence of secondary exhaust steam at the elbow, thereby increasing the vacuum effect of the Venturi and increasing the amount of exhaust steam reuse to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: an energy-saving and high-efficiency steam condensate heat pump for papermaking, comprising a pump body, the lower end of the pump body is integrally connected to a regulating chamber, and the lower end surface of the regulating chamber is integrally connected to a mixing chamber A, the lower end of the mixing chamber A is integrally connected to a mixing chamber B, and the lower end of the mixing chamber B is fixedly connected to a diffuser;

[0009] The outer rear end surface of the pump body is fixedly connected with a high-pressure steam inlet pipe for high-pressure steam to enter;

[0010] The outer front end surface of the pump body is fixedly connected with an exhaust steam inlet pipe for secondary exhaust steam to enter;

[0011] The upper end surface of the pump body is fixedly connected with a pneumatic adjustment device, which includes a cylinder, a hydraulic cylinder and a push rod;

[0012] The pump body is internally movably connected with a gas rod connected to the output end of the pneumatic regulating device, one end of the gas rod away from the pneumatic regulating device is located inside the regulating chamber, and one end of the gas rod is fixedly connected with a spindle nozzle.

[0013] Preferably, a mixing nozzle is provided between the regulating chamber and the mixing chamber A, the spindle nozzle corresponds to the mixing nozzle, and the deviation angle between the central axis B of the mixing chamber A and the central axis A of the gas rod and the spindle nozzle is 10° to 15°.

[0014] Preferably, a gas spiral mixing structure is provided inside the mixing chamber B to increase the flow resistance of the exhaust gas and the high-pressure steam and improve the mixing effect.

[0015] Preferably, the gas spiral mixing structure comprises inner spiral gas mixing grooves formed on the inner wall of the mixing chamber B.

[0016] Preferably, the gas spiral mixing structure includes a spiral gas mixing chamber opened inside the mixing chamber B.

[0017] Preferably, a gas guide structure is provided inside the exhaust steam inlet pipe to reduce the turbulence of secondary exhaust steam at the elbow inside the exhaust steam inlet pipe, increase the vacuum effect of the Venturi, and increase the amount of exhaust steam reuse.

[0018] Preferably, the gas guide structure comprises a guide plate A with an arc-shaped structure fixed in the exhaust steam inlet pipe.

[0019] Preferably, the gas guide structure comprises a guide plate B of an arc-shaped structure fixed to the inner wall of the exhaust steam inlet pipe at equal distances in an annular manner.

[0020] Preferably, a conical gas diffusion chamber is provided in the diffuser, and a gas angle diffusion adjustment structure is provided in the gas diffusion chamber;

[0021] The gas angle diffusion adjustment structure comprises arc-shaped diffusion plates distributed in the gas diffusion chamber at equal distances in an annular manner, and a slide rail is fixed to the outside of the diffusion plate, and the diffusion plate is slidably connected to the inner wall of the gas diffusion chamber through the slide rail;

[0022] An elastic blocking piece is fixedly connected to the inner wall of the left end of the diffusion plate at an angle, an electromagnet is embedded in the diffuser plate at a position corresponding to the elastic blocking piece, a magnetic metal is embedded in the inner wall of one end of the elastic blocking piece, and a high temperature resistant elastic film is fixed between adjacent diffusion plates.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Built-in guide plate in the exhaust steam inlet pipe: The exhaust steam inlet pipe of the traditional and existing devices has no guide plate. The invention adds a guide plate to reduce the turbulence of the secondary exhaust steam at the elbow, thereby increasing the vacuum effect of the Venturi and increasing the amount of exhaust steam reuse.

[0025] 2. The high-pressure steam nozzle of the present application uses an adjustable spindle-type structure: compared with the traditional trapezoidal cross-section, the high-pressure steam flow regulation of the spindle-type cross-section structure is smoother and more accurate.

[0026] 3. The high-pressure steam nozzle of the present application is arranged eccentrically: the nozzle center and the center of the mixing chamber A are not on the same axis, but are appropriately deviated so that the steam flow produces a moderate detonation effect, the heat transfer is more complete, and at the same time the viscosity of water can be reduced, the film-forming property of the steam in the drying cylinder is reduced, and the heat transfer efficiency is increased.

[0027] 4. Spiral mixing chamber: appropriately increases the flow resistance and improves the mixing effect.

[0028] Extra-long diffuser: Reducing the diffusion angle reduces steam pressure loss and achieves energy-saving effect. The built-in gas angle diffusion adjustment structure of the diffuser allows users to adjust the gas diffusion range according to usage requirements to meet processing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is the overall structural view of the present invention;

[0031] Figure 2 It is a rear view of the overall structure of the present invention;

[0032] Figure 3It is a cross-sectional view of the overall structure of the present invention;

[0033] Figure 4 This is a view of the first gas spiral mixing structure of the present invention;

[0034] Figure 5 A view of a second gas spiral mixing structure of the present invention;

[0035] Figure 6 For the present invention Figure 3 Enlarged view at A in the middle;

[0036] Figure 7 A structural view of a diffuser plate of the present invention;

[0037] Figure 8 A view of a second gas guide structure of the present invention;

[0038] Fig. 9 This is a structural diagram of a steam heat pump in the prior art of the present invention.

[0039] Description of reference numerals:

[0040] 1. Pneumatic regulating equipment; 2. High-pressure steam inlet pipe; 3. Exhaust steam inlet pipe; 4. Pump body; 5. Regulating chamber; 6. Mixing chamber A; 7. Mixing chamber B; 8. Diffuser; 10. Gas rod; 11. Spindle nozzle; 13. Mixing nozzle; 14. Guide plate A; 15. Inner spiral gas mixing groove; 16. Spiral gas mixing chamber; 17. Gas diffusion chamber; 18. Diffuser plate; 19. Electromagnet; 20. Elastic blocking sheet; 21. Slide rail; 22. High temperature resistant elastic membrane; 23. Guide plate B. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figures 1 to 9 , the present invention provides a technical solution:

[0043] An energy-saving and high-efficiency steam condensate heat pump for papermaking, comprising a pump body 4, the lower end of the pump body 4 is integrally connected with a regulating chamber 5, and the lower end surface of the regulating chamber 5 is integrally connected with a mixing chamber A6, the lower end of the mixing chamber A6 is integrally connected with a mixing chamber B7, and the lower end of the mixing chamber B7 is fixedly connected with a diffuser 8;

[0044] The outer rear end surface of the pump body 4 is fixedly connected with a high-pressure steam inlet pipe 2 for high-pressure steam to enter;

[0045] The front end surface of the pump body 4 is fixedly connected to a waste steam inlet pipe 3 for secondary waste steam to enter;

[0046] The upper end surface of the pump body 4 is fixedly connected with a pneumatic regulating device 1, which includes a cylinder, a hydraulic cylinder and a push rod;

[0047] The pump body 4 is internally movably connected with a gas rod 10 connected to the output end of the pneumatic regulating device 1 , one end of the gas rod 10 away from the pneumatic regulating device 1 is located inside the regulating chamber 5 , and one end of the gas rod 10 is fixedly connected with a spindle nozzle 11 .

[0048] The user utilizes the pneumatic regulating device 1 to drive the air rod 10 to move rightward inside the pump body 4. Under the action of the conical surface outside the spindle nozzle 11 cooperating with the mixing nozzle 13, due to the different inclination angles of the conical surface outside the spindle nozzle 11, the gap of the mixing nozzle 13 continues to shrink when the spindle nozzle 11 moves to the right, and conversely expands when it moves to the left. The above method is used to achieve the steam intake of high-pressure steam through the mixing nozzle 13.

[0049] Specifically, if Figure 3 As shown, a mixing nozzle 13 is provided between the regulating chamber 5 and the mixing chamber A6, the spindle nozzle 11 corresponds to the mixing nozzle 13, and the deviation angle between the central axis B of the mixing chamber A6 and the central axis A of the gas rod 10 and the spindle nozzle 11 is 10° to 15°.

[0050] The center of the nozzle and the center of the mixing chamber A6 are not on the same axis, but are appropriately deviated so that the steam flow produces a moderate detonation effect and the heat transfer is more complete. At the same time, the viscosity of water can be reduced, the film-forming property of steam in the drying cylinder is reduced, and the heat transfer efficiency is increased.

[0051] The mixing chamber B7 is provided with a gas spiral mixing structure inside to increase the flow resistance of the exhaust gas and the high-pressure steam and improve the mixing effect.

[0052] In Example 1, the gas spiral mixing structure includes an inner spiral gas mixing groove 15 formed on the inner wall of the mixing chamber B7.

[0053] In Example 2, the gas spiral mixing structure includes a spiral gas mixing chamber 16 opened inside the mixing chamber B7.

[0054] Both Example 1 and Example 2 can be used to increase the flow resistance of exhaust gas and high-pressure steam and improve the mixing effect. Users can choose to use them according to specific circumstances.

[0055] A gas guide structure is provided inside the exhaust steam inlet pipe 3 to reduce the turbulence of secondary exhaust steam at the elbow inside the exhaust steam inlet pipe 3, increase the vacuum effect of the Venturi, and increase the amount of exhaust steam reuse.

[0056] In Example 3, the gas guide structure includes a guide plate A14 with an arc structure fixed in the exhaust steam inlet pipe 3.

[0057] In Embodiment 4, the gas guide structure comprises a guide plate B23 of an arc structure fixed to the inner wall of the exhaust steam inlet pipe 3 at equal intervals in an annular manner.

[0058] Both Example 3 and Example 4 can reduce the turbulence of secondary exhaust steam at the elbow in the exhaust steam inlet pipe 3, increase the vacuum effect of the Venturi, and increase the amount of exhaust steam recycling. Users can choose to use them according to specific usage conditions.

[0059] Specifically, if Figure 6 and Figure 7 As shown, a conical gas diffusion chamber 17 is provided in the diffuser 8, and a gas angle diffusion adjustment structure is provided in the gas diffusion chamber 17;

[0060] The gas angle diffusion adjustment structure includes an arc-shaped diffuser plate 18 distributed in the gas diffusion chamber 17 at equal intervals in an annular manner, and a slide rail 21 is fixed to the outside of the diffuser plate 18, and the diffuser plate 18 is slidably connected to the inner wall of the gas diffusion chamber 17 through the slide rail 21;

[0061] An elastic blocking piece 20 is obliquely and fixedly connected to the inner wall of the left end of the diffuser plate 18, an electromagnet 19 is embedded in the diffuser plate 18 at a position corresponding to the elastic blocking piece 20, a magnetic metal is embedded in the inner wall of one end of the elastic blocking piece 20, and a high temperature resistant elastic membrane 22 is fixed between adjacent diffusers 18.

[0062] During operation, a controller connected to the electromagnet 19 from the outside controls the magnitude of the current passing through the electromagnet 19 through the controller, thereby changing the magnitude of the magnetic force of the electromagnet 19. The electromagnet 19 with different magnetic forces magnetically attracts the bending angle of the elastic blocking piece 20 having magnetic metal, thereby changing the contact area between the airflow and the elastic blocking piece 20, thereby achieving the pushing force on the arc-shaped structure diffusion plate 18. The diffusion plate 18 moves toward the opening direction of the gas diffusion chamber 17 on the right side through the slide rail 21. The gas diffusion chamber 17 opens at the right end of the diffusion plate 18 to increase the gas diffusion range. The high-temperature resistant elastic membrane 22 is used to seal the gap after the displacement of adjacent diffusion plates 18, and the elastic deformation of the elastic membrane made of high-temperature resistant rubber material is used to compensate for the displacement gap of adjacent diffusion plates 18.

[0063] Working principle: When working, high-pressure steam is connected to the high-pressure steam inlet pipe 2 through a pipeline, and secondary exhaust steam is connected through the exhaust steam inlet pipe 3. During the operation of the heat pump, high-pressure steam enters the pump body 4 through the high-pressure steam inlet pipe. In this process, the exhaust steam enters the pump body 4 through the exhaust steam inlet pipe 3 through the guide plate and enters the adjustment chamber 5. The user drives the gas rod 10 to move rightward inside the pump body 4 by using the pneumatic adjustment device 1. Under the action of the conical surface outside the spindle nozzle 11 and the mixing nozzle 13, due to the different inclination angles of the conical surface outside the spindle nozzle 11, when the spindle nozzle 11 moves to the right, the gap of the mixing nozzle 13 is continuously reduced, and conversely, it is expanded when it moves to the left. The above method is used to achieve the steam intake of high-pressure steam through the mixing nozzle 13, and the high-pressure steam injection generates a vacuum to attract the secondary exhaust steam to the mixing chamber A6 for further mixing. Then the mixed gas enters the mixing chamber B7 and is secondary mixed through the gas spiral mixing structure, and then enters the diffuser 8 and is sprayed to the designated equipment. By controlling the high-pressure steam flow rate, vacuum of different requirements is generated, which is adapted to the comprehensive utilization of secondary exhaust steam.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving and high-efficiency steam condensate heat pump for papermaking, comprising a pump body (4), characterized in that: The lower end of the pump body (4) is integrally connected to a regulating chamber (5), and the lower end surface of the regulating chamber (5) is integrally connected to a mixing chamber A (6), the lower end of the mixing chamber A (6) is integrally connected to a mixing chamber B (7), and the lower end of the mixing chamber B (7) is fixedly connected to a diffuser (8); The outer rear end surface of the pump body (4) is fixedly connected to a high-pressure steam inlet pipe (2) for high-pressure steam to enter; The outer front end surface of the pump body (4) is fixedly connected to a waste steam inlet pipe (3) for secondary waste steam to enter; The upper end surface of the pump body (4) is fixedly connected to a pneumatic adjustment device (1), wherein the pneumatic adjustment device (1) comprises a cylinder, a hydraulic cylinder and a push rod; The pump body (4) is internally movably connected to a gas rod (10) connected to the output end of the pneumatic regulating device (1), one end of the gas rod (10) away from the pneumatic regulating device (1) is located inside the regulating chamber (5), and one end of the gas rod (10) is fixedly connected to a spindle nozzle (11); A conical gas diffusion chamber (17) is provided in the diffuser (8), and a gas angle diffusion adjustment structure is provided in the gas diffusion chamber (17); The gas angle diffusion adjustment structure comprises arc-shaped diffusion plates (18) distributed in annular and equidistant manner in the gas diffusion chamber (17), and a slide rail (21) is fixed to the outside of the diffusion plate (18), and the diffusion plate (18) is slidably connected to the inner wall of the gas diffusion chamber (17) via the slide rail (21); An elastic blocking sheet (20) is fixedly connected to the inner wall of the left end of the diffusion plate (18) at an angle, an electromagnet (19) is embeddedly connected to the inside of the diffusion plate (18) at a position corresponding to the elastic blocking sheet (20), a magnetic metal is embeddedly connected to the inner wall of one end of the elastic blocking sheet (20), and a high temperature resistant elastic membrane (22) is fixed between adjacent diffusion plates (18).

2. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 1 is characterized in that: A mixing nozzle (13) is provided between the regulating chamber (5) and the mixing chamber A (6); the spindle nozzle (11) corresponds to the mixing nozzle (13); and the deviation angle between the central axis B of the mixing chamber A (6) and the central axis A of the gas rod (10) and the spindle nozzle (11) is 10° to 15°.

3. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 1 is characterized in that: The mixing chamber B (7) is provided with a gas spiral mixing structure inside to increase the flow resistance of the exhaust gas and the high-pressure steam and improve the mixing effect.

4. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 3 is characterized in that: The gas spiral mixing structure comprises an inner spiral gas mixing groove (15) formed on the inner wall of the mixing chamber B (7).

5. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 3 is characterized in that: The gas spiral mixing structure comprises a spiral gas mixing chamber (16) opened inside the mixing chamber B (7).

6. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 1, characterized in that: A gas guide structure is provided inside the exhaust steam inlet pipe (3) for reducing the turbulence of secondary exhaust steam at the elbow inside the exhaust steam inlet pipe (3), increasing the vacuum effect of the Venturi, and increasing the amount of exhaust steam recycled.

7. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 6, characterized in that: The gas flow guiding structure comprises a flow guiding plate A (14) of an arc-shaped structure fixed in the exhaust steam inlet pipe (3).

8. The energy-saving and high-efficiency steam condensate heat pump for papermaking according to claim 6, characterized in that: The gas flow guiding structure comprises a flow guiding plate B (23) of an arc structure fixed to the inner wall of the exhaust steam inlet pipe (3) at equal intervals in an annular manner.

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