Inclined plate type zero-leakage economizer

Abstract

The utility model belongs to the field of energy conservation and environmental protection, and discloses an inclined plate type zero-leakage economizer which comprises an inner circulation assembly arranged in a vertical flue, and the inner circulation assembly exchanges heat with an outer circulation assembly arranged on the outer wall of the vertical flue. The inner circulation assembly comprises a heating medium water tank arranged in the vertical flue, the heating medium water tank is communicated with heat exchange pieces obliquely arranged in the vertical flue, the high ends of the heat exchange pieces are communicated with the outer circulation assembly, and a plurality of descending water pipes are arranged between the heating medium water tank and the outer circulation assembly and located in the smoke outlet direction of the heat exchange pieces. The outer circulation assembly comprises a heat exchange box, the side wall of the heat exchange box communicates with the heat exchange pieces, and the heat exchange box communicates with outer circulation water. The zero-leakage external wide-channel plate type low-temperature economizer is simple in structure, the internal circulation assembly and the external circulation assembly operate independently, leakage risks are avoided, zero leakage of condensed water of a boiler can be achieved, meanwhile, it is guaranteed that internal circulation is conducted stably, and the problem that the arrangement position of a common zero-leakage external wide-channel plate type low-temperature economizer is limited is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of energy-saving and environmental protection technology, and in particular relates to an inclined plate type zero-leakage economizer. Background Technology

[0002] Low-temperature economizers are devices that effectively save coal and improve boiler efficiency in the low-temperature range. They are mainly used in the medium-low temperature range at the outlet of the air preheater of large boilers in power plants and thermal power plants. By recovering the waste heat of flue gas to heat the boiler feedwater, they effectively reduce the thermal efficiency of the flue gas. Low-temperature economizers are usually installed on the tail flue at the outlet of the boiler air preheater. They can not only improve the efficiency of electrostatic precipitators and meet the requirements for low emissions, but also reduce power consumption and the size of downstream equipment. At the same time, they can remove most of the acidic gases.

[0003] Currently, most power plants use finned tubes, which have a large heat exchange area and a small footprint. However, finned tube economizers can become clogged and leaky after prolonged use. Two new products have been introduced to the market: vacuum heat pipe heat exchangers and zero-leakage external wide-channel plate heat exchangers. However, since both of these products use the principle of steam condensation and descent, they are limited to horizontal flue layouts. For certain coal-fired power plants, there is insufficient space in the horizontal flue, which restricts the layout and prevents these two new products from being effective.

[0004] Therefore, this application designs an inclined plate type zero-leakage economizer to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes an inclined plate type zero-leakage economizer.

[0006] To achieve the above objectives, this utility model provides an inclined plate type zero-leakage economizer, including an internal circulation component installed in a vertical flue, wherein the internal circulation component is connected to an external circulation component installed on the outer wall of the vertical flue and performs heat exchange.

[0007] The internal circulation component includes a heat medium water tank disposed in the vertical flue, the heat medium water tank being connected to a heat exchange plate disposed at an incline upward in the vertical flue, the high end of the heat exchange plate being connected to the external circulation component, and a plurality of downcomer pipes being disposed between the heat medium water tank and the external circulation component, the downcomer pipes being located in the flue gas outlet direction of the heat exchange plate;

[0008] The external circulation component includes a heat exchange box, the sidewall of which is connected to the heat exchange plates, and external circulating water is connected to the heat exchange box.

[0009] Preferably, the heat exchange box has a heat exchange chamber inside, and a plurality of longitudinally arranged heat exchange tubes are provided in the heat exchange chamber. External circulating water flows in the heat exchange tubes, and the heat exchange plates exchange heat with the heat exchange tubes.

[0010] Preferably, a water outlet manifold is provided at the top of the heat exchange box, and the top ends of the plurality of heat exchange pipes are respectively connected to the bottom end of the water outlet manifold.

[0011] Preferably, the top of the water outlet manifold is connected to a water outlet header, which is used to discharge hot water.

[0012] Preferably, a water inlet manifold is provided at the bottom of the heat exchange box, and the bottom ends of the plurality of heat exchange pipes are respectively connected to the top of the water inlet manifold.

[0013] Preferably, the bottom end of the water inlet manifold is connected to a water inlet header, which is used to supply cold water.

[0014] Preferably, the bottom end of the heat exchange chamber is inclined toward the inner cavity of the vertical flue, and the downcomer pipe is connected to the lower end of the inner cavity of the heat exchange chamber.

[0015] Preferably, the heat transfer medium tank is equipped with negative pressure.

[0016] Compared with the prior art, this utility model has the following advantages and technical effects: This utility model discloses an inclined plate type zero-leakage economizer, which uses independently set internal and external circulation for heat exchange, and the two are independent and do not contact each other, avoiding water leakage in the circulation and facilitating long-term use; During operation, the flue gas passes through the inclined heat exchange plates and exchanges heat with the heat exchange plates, the temperature of the flue gas decreases, and the water in the heat exchange plates absorbs heat and vaporizes, becoming a steam-water mixture that rises until it becomes steam and enters the high-end heat exchange box to exchange heat with the external circulation water in the external circulation component. At the same time, the water in the heat medium water tank replenishes the heat exchange plates to facilitate circulation; After the external circulation water absorbs heat and rises in temperature, it enters the heat recovery equipment, while the steam in the heat exchange box dissipates heat, cools down and liquefies, and collects in the heat exchange box before flowing back to the heat medium water tank through the downcomer, and then circulates again, so that the water in the internal circulation component circulates continuously, continuously cooling the flue gas and recovering waste heat.

[0017] This utility model has a simple structure, with the internal circulation component and the external circulation component operating independently, eliminating the risk of leakage. It can achieve zero leakage of boiler condensate while ensuring stable internal circulation. It also effectively solves the problem of limited placement of ordinary zero-leakage external wide-channel plate-type low-temperature economizers. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the inclined plate type zero-leakage economizer of this utility model;

[0020] Figure 2 This is a schematic diagram of the heat exchange box structure of this utility model;

[0021] Figure 3 This utility model Figure 2 A magnified view of part A in the image;

[0022] In the diagram: 1. Vertical flue; 2. Inlet header; 3. Inlet manifold; 4. Heat exchange pipe; 5. Outlet manifold; 6. Outlet header; 7. Heat exchange plate; 8. Downcomer; 9. Heat medium tank; 10. Heat exchange chamber; 11. Heat exchange box. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figures 1-3 As shown, this embodiment provides an inclined plate type zero-leakage economizer, including an inner circulation component installed in a vertical flue 1, which is connected to an outer circulation component installed on the outer wall of the vertical flue 1 for heat exchange.

[0026] The internal circulation component includes a heat medium water tank 9 installed in a vertical flue 1. The heat medium water tank 9 is connected to a heat exchange plate 7 installed at an angle upward in the vertical flue 1. The high end of the heat exchange plate 7 is connected to the external circulation component. Several downcomer pipes 8 are installed between the heat medium water tank 9 and the external circulation component. The downcomer pipes 8 are located in the flue gas outlet direction of the heat exchange plate 7.

[0027] The external circulation component includes a heat exchange box 11, the side wall of which is connected to the heat exchange plates 7, and external circulating water is connected to the heat exchange box 11. This utility model discloses an inclined plate type zero-leakage economizer, which uses independently set internal and external circulation for heat exchange, and the two are independent and do not contact each other, avoiding water leakage in the circulation and facilitating long-term use. During operation, the flue gas passes through the inclined heat exchange plates 7 and exchanges heat with them, causing the flue gas temperature to drop. The water in the heat exchange plates 7 absorbs heat and vaporizes, becoming a steam-water mixture that rises until it becomes steam and enters the high-end heat exchange box to exchange heat with the external circulating water in the external circulation component. At the same time, the water in the heat medium water tank 9 replenishes the heat exchange plates 7 to facilitate circulation. After the external circulating water absorbs heat and heats up, it enters the heat recovery equipment, while the steam in the heat exchange box 11 dissipates heat, cools down, and liquefies. After collecting in the heat exchange box 11, it flows back to the heat medium water tank 9 through the downcomer 8 for another circulation, so that the water in the internal circulation component circulates continuously, continuously cooling the flue gas and recovering waste heat. This utility model has a simple structure, with the internal circulation component and the external circulation component operating independently, eliminating the risk of leakage. It can achieve zero leakage of boiler condensate while ensuring stable internal circulation. It also effectively solves the problem of limited placement of ordinary zero-leakage external wide-channel plate-type low-temperature economizers.

[0028] Furthermore, in this embodiment, some water is reserved in the heat exchange plate 7 so that the flue gas can absorb heat when it passes through.

[0029] Further optimizing the design, a heat exchange chamber 10 is provided inside the heat exchange box 11. Several longitudinally arranged heat exchange pipes 4 are installed within the heat exchange chamber 10. External circulating water flows through the heat exchange pipes 4, and the heat exchange plates 7 exchange heat with the heat exchange pipes 4. The heat exchange chamber 10 is located inside the heat exchange box 11, extending through the side of the heat exchange box 11 closest to the vertical flue 1, facilitating communication between the heat exchange plates 7 and the heat exchange chamber 10. Steam entering the heat exchange chamber 10 contacts the heat exchange pipes 4 and exchanges heat with the cold water inside the heat exchange pipes 4, absorbing the heat from the steam and causing it to cool down. Water droplets condense on the surface of the heat exchange pipes 4 and collect, flowing back to the heat transfer medium tank 9 through the downcomer pipe 8, forming a complete internal circulation.

[0030] Furthermore, to improve the heat exchange cavity 10's insulation performance, an insulation layer is provided on the inner wall of the heat exchange cavity 10 to reduce the impact of high-temperature steam on the outside environment.

[0031] Further optimizing the design, a water outlet manifold 5 is installed at the top of the heat exchange box 11, and the top ends of several heat exchange pipes 4 are connected to the bottom end of the water outlet manifold 5. A water outlet header 6 is connected to the top of the water outlet manifold 5, which is used to discharge hot water. A water inlet manifold 3 is installed at the bottom of the heat exchange box 11, and the bottom ends of several heat exchange pipes 4 are connected to the top of the water inlet manifold 3. A water inlet header 2 is connected to the bottom of the water inlet manifold 3, which is used to supply cold water. During external circulation operation, cold water enters the water inlet manifold 3 from the lower water inlet header 2, and after being evenly distributed by the water inlet manifold 3, it enters the heat exchange pipes 4 to exchange heat with the steam entering the heat exchange chamber 10. The heated cold water is collected in the water outlet manifold 5 and then discharged from the water outlet header 6, where waste heat is recovered through a heat recovery device.

[0032] In a further optimized design, the bottom end of the heat exchange chamber 10 is inclined toward the inner cavity of the vertical flue 1, and the downcomer pipe 8 is connected to the lower end of the inner cavity of the heat exchange chamber 10. With the bottom end of the heat exchange chamber 10 inclined, the water recondensed from the steam collects at the lower end of the heat exchange chamber 10, and then flows back into the heat medium water tank 9 through the downcomer pipe 8, thus achieving internal circulation.

[0033] The design was further optimized by incorporating negative pressure within the heat transfer medium tank 9. This negative pressure design lowers the internal circulation pressure compared to atmospheric pressure, thereby reducing the vaporization temperature of the water used as the medium within the internal circulation and facilitating vaporization after heat absorption.

[0034] Work process:

[0035] Step 1: The waste heat flue gas in the vertical flue 1 passes from top to bottom through the heat exchange plate 7, transferring the waste heat to the heat exchange plate 7.

[0036] Step 2: Heat medium self-circulation system: ① After the heat medium water absorbs heat in the heat exchange plate 7, it becomes a steam-water mixture and rises until it becomes water vapor and enters the high-end heat exchange box 11; ② After the water vapor exchanges heat with the heat exchange tube 4, it condenses and becomes water droplets, which flow along the tube wall of the heat exchange tube 4 to the inclined bottom plate at the bottom of the heat exchange chamber 10; ③ The heat medium water on the bottom plate uses the density difference to flow back to the heat medium water tank 9 through the downcomer pipe 8 under the action of gravity; ④ Under the action of the liquid level, the water in the heat medium water tank 9 continuously enters the heat exchange plate 7 for heating, and the heat medium water forms a self-circulation.

[0037] Step 3: The condensate is heated by the steam-water heat exchange in the heat exchange tube 4 and then discharged directly for use. Since the boiler condensate tube does not come into contact with the flue gas, but only exchanges heat with the water vapor, there is no risk of leakage, and zero leakage of boiler condensate can be achieved.

[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A slanted plate type zero-leakage economizer, characterized in that: It includes an internal circulation component disposed in a vertical flue (1), which is connected to an external circulation component disposed on the outer wall of the vertical flue (1) and exchanges heat with it; The internal circulation component includes a heat medium water tank (9) disposed in the vertical flue (1), the heat medium water tank (9) is connected to a heat exchange plate (7) disposed inclined upward in the vertical flue (1), the high end of the heat exchange plate (7) is connected to the external circulation component, and a plurality of downcomer pipes (8) are disposed between the heat medium water tank (9) and the external circulation component, the downcomer pipes (8) being located in the flue gas outlet direction of the heat exchange plate (7); The external circulation assembly includes a heat exchange box (11), the side wall of which is connected to the heat exchange plate (7), and external circulating water is connected to the heat exchange box (11).

2. The inclined plate type zero-leakage economizer according to claim 1, characterized in that: The heat exchange box (11) has a heat exchange chamber (10) inside, and a number of longitudinally arranged heat exchange tubes (4) are provided in the heat exchange chamber (10). External circulating water flows in the heat exchange tubes (4), and the heat exchange plate (7) exchanges heat with the heat exchange tubes (4).

3. The inclined plate type zero-leakage economizer according to claim 2, characterized in that: The top of the heat exchange box (11) is provided with a water outlet header (5), and the top ends of several heat exchange pipes (4) are respectively connected to the bottom end of the water outlet header (5).

4. The inclined plate type zero-leakage economizer according to claim 3, characterized in that: The top of the water outlet manifold (5) is connected to a water outlet header (6), which is used to discharge hot water.

5. The inclined plate type zero-leakage economizer according to claim 2, characterized in that: The bottom of the heat exchange box (11) is provided with a water inlet manifold (3), and the bottom ends of several heat exchange pipes (4) are respectively connected to the top of the water inlet manifold (3).

6. The inclined plate type zero-leakage economizer according to claim 5, characterized in that: The bottom end of the water inlet manifold (3) is connected to the water inlet header (2), which is used to supply cold water.

7. The inclined plate type zero-leakage economizer according to claim 2, characterized in that: The bottom end of the heat exchange chamber (10) is inclined toward the inner cavity of the vertical flue (1), and the downcomer pipe (8) is connected to the lower end of the inner cavity of the heat exchange chamber (10).

8. The inclined plate type zero-leakage economizer according to claim 1, characterized in that: The heat transfer medium tank (9) is equipped with negative pressure.

Images