Waste incineration slag waste heat recovery device

Abstract

The utility model discloses a waste incineration slag waste heat recovery device, and relates to the technical field of slag waste heat recovery. Comprising a reaction chamber used for mixing slag and sewage, the bottom of the reaction chamber is provided with a filter box used for separating the slag and the sewage, the filter box is communicated with the reaction chamber through a water return assembly, and the top surface of the reaction chamber is communicated with a heat exchange chamber used for exchanging heat with clean water through an air outlet pipe; the bottom of the heat exchange chamber communicates with the water return assembly through a water return pipe, and the upper portion of the side, away from the water return assembly, of the reaction chamber is fixedly connected and communicates with a feeding pipe used for conveying slag. Existing sewage and slag of the garbage power plant are mixed in the reaction chamber, the sewage is heated by the slag to generate steam, the steam generated in the reaction chamber is conveyed to the heat exchange chamber to exchange heat with clean water, and the sewage generated after heat exchange flows back to the reaction chamber, so that the sewage is effectively utilized, and the heat exchange efficiency is improved. And the heat exchange efficiency of clean water is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology of slag, and in particular to a waste incineration slag waste heat recovery device. Background Technology

[0002] Waste-to-energy is one of the effective methods for waste recycling. Existing waste-to-energy plants mainly use grate incinerators. The slag produced by these incinerators is mainly composed of oxides (silicon dioxide, aluminum oxide, calcium oxide, and magnesium oxide), and often contains sulfides and a small amount of metal. It also typically has a high temperature of over 300°C, making it a good waste heat resource with high waste heat recovery and utilization value.

[0003] However, for the treatment of slag, liquid-sealed slag removers are now commonly used to mix a large amount of cooling water with the slag and send it into the slag pit. However, this wastes a lot of water resources and the waste heat of the slag is not fully utilized.

[0004] Current slag waste heat recovery devices mainly employ water circulation systems and air circulation systems. For example, patent publication number CN222186959U uses a drum with surrounding water pipes. The drum is rotated by a drive component, and the heat from the slag is evenly released into the water in the pipes. The resulting hot water circulates in the system, delivering the heat to where it is needed. As for air circulation systems, patent publication number CN118640478A utilizes air as a heat medium, transferring the heat from the slag to the air to form hot air. This hot air is used to heat the primary air in the incinerator, improving combustion efficiency.

[0005] While the aforementioned existing technologies can recover waste heat from waste incineration ash, they also have the following problems:

[0006] (1) The slag temperature is very high. The water circulation system requires the water pipes to have good heat resistance and thermal conductivity, which will further increase the cost of the power plant.

[0007] (2) Using slag to exchange heat with air has low heat exchange efficiency and cannot fully utilize the heat of slag, which leads to energy waste.

[0008] (3) The slag contains harmful substances such as heavy metals. During the treatment process, pollutants such as waste gas, wastewater and waste residue may be generated. If not handled properly, it will cause harm to the environment and human health.

[0009] Therefore, there is an urgent need for a waste heat recovery device for waste incineration slag. By using the existing wastewater from the waste-to-energy plant to recover the waste heat from the slag, it can not only effectively improve heat exchange efficiency, but also effectively save water resources. Utility Model Content

[0010] The purpose of this invention is to provide a waste heat recovery device for waste incineration slag to solve the problems existing in the prior art.

[0011] To achieve the above objectives, this utility model provides the following solution: This utility model provides a waste incineration slag waste heat recovery device, including a reaction chamber for mixing slag and wastewater, a filter box for separating slag and wastewater at the bottom of the reaction chamber, the filter box being connected to the reaction chamber via a water return assembly, a heat exchange chamber for exchanging heat with clean water being connected to the top surface of the reaction chamber via an exhaust pipe, the bottom of the heat exchange chamber being connected to the water return assembly via a water return pipe, and a feed pipe for conveying slag being fixedly connected and connected to the upper part of the side of the reaction chamber away from the water return assembly.

[0012] Preferably, a rotating wheel is rotatably connected to the lower part of the reaction chamber, and the bottom of the reaction chamber is connected to the filter box through a discharge pipe.

[0013] Preferably, the filter box is divided into a slag storage chamber and a wastewater chamber by a filter screen. The wastewater chamber is located below the slag storage chamber. The top surface of the slag storage chamber is provided with a cover plate, which is located on one side of the reaction chamber and is rotatably connected to the top surface of the filter box.

[0014] Preferably, the bottom of the sewage chamber is inclined.

[0015] Preferably, the return water assembly includes a drain pipe fixedly connected and communicating with the sewage chamber. One end of the drain pipe extending out of the sewage chamber is fixedly connected and communicating with the inlet end of a sewage pump. The outlet end of the sewage pump is fixedly connected and communicating with a sewage pipe. The sewage pipe is fixedly connected and communicating with an inlet pipe. The inlet pipe is connected to the return water pipe. One end of the inlet pipe is connected to the sewage pipe of the waste-to-energy plant, and the other end of the inlet pipe extends into the reaction chamber.

[0016] Preferably, the ends of the water inlet pipe and the feed pipe that extend into the reaction chamber are both located on the same side above the rotating wheel.

[0017] Preferably, a first one-way valve is installed at the end of the sewage pipe near the water inlet pipe.

[0018] Preferably, a second one-way valve is installed at one end of the water inlet pipe that extends into the reaction chamber.

[0019] Preferably, the water inlet pipe is inclined, with the lower end of the water inlet pipe located in the reaction chamber.

[0020] Preferably, a heat exchange tube is provided in the heat exchange chamber, one end of the heat exchange tube extends out of the top surface of the heat exchange chamber and is connected to the air outlet pipe, and the other end of the heat exchange tube extends out of the bottom of the heat exchange chamber and is connected to the return water pipe.

[0021] The top surface of the heat exchange chamber is fixedly connected to and communicates with a hot water pipe for conveying hot water, and the bottom of the heat exchange chamber is fixedly connected to and communicates with a cold water pipe for conveying room temperature water.

[0022] The present invention discloses the following technical effects:

[0023] This invention mixes existing wastewater and slag from a waste-to-energy plant in a reaction chamber, where the wastewater is heated by the filter residue to generate steam. The steam generated in the reaction chamber is then transported to a heat exchange chamber to exchange heat with clean water. The wastewater generated after the heat exchange is returned to the reaction chamber, which not only effectively utilizes the wastewater but also significantly improves the heat exchange efficiency of the clean water, thus effectively saving water resources. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a cross-sectional view of the reaction chamber and filter box of this utility model;

[0027] Figure 3 This is a schematic diagram of the filter box structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the rotating wheel structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the internal structure of the heat exchange chamber of this utility model;

[0030] The components are as follows: 1. Reaction chamber; 2. Filter box; 3. Heat exchange chamber; 11. Rotating wheel; 12. Feed pipe; 13. Water inlet pipe; 14. Discharge pipe; 15. Gas outlet pipe; 16. Water return pipe; 21. Filter screen; 22. Cover plate; 23. Drain pipe; 24. Sewage pump; 25. Sewage pipe; 31. Heat exchange tube; 32. Hot water pipe; 33. Cold water pipe. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] Reference Figures 1-5 This utility model discloses a waste heat recovery device for incinerator slag, including a reaction chamber 1 for mixing slag and wastewater, a filter box 2 for separating slag and wastewater at the bottom of the reaction chamber 1, the filter box 2 being connected to the reaction chamber via a water return assembly, a heat exchange chamber 3 for exchanging heat with clean water at the top of the reaction chamber 1 via an exhaust pipe 15, the bottom of the heat exchange chamber 3 being connected to the water return assembly via a water return pipe 16, and a feed pipe 12 for conveying slag being fixedly connected and connected to the upper part of the side of the reaction chamber 1 away from the water return assembly. The feed pipe 12 is inclined to allow the slag to fall effectively into the reaction chamber 1.

[0034] To prevent slag from clogging the feed pipe 12, a conveying auger is used in the feed pipe 12, which can effectively transport the slag to the reaction chamber 1.

[0035] This invention mixes existing wastewater and slag from a waste-to-energy plant in a reaction chamber 1, where the wastewater is heated by the filter residue to generate steam. The steam generated in the reaction chamber 1 is then transported to a heat exchange chamber 3 to exchange heat with clean water. The wastewater generated after the heat exchange is then returned to the reaction chamber 1. This not only effectively utilizes the wastewater but also significantly improves the heat exchange efficiency of the clean water, thus effectively saving water resources.

[0036] In a further optimized design, a rotating wheel 11 is rotatably connected to the lower part of the reaction chamber 1, and the bottom of the reaction chamber 1 is connected to the filter box 2 via a discharge pipe 14. The rotation of the rotating wheel 11 allows for effective mixing of wastewater and slag. A first solenoid valve is installed inside the discharge pipe 14; opening the first solenoid valve allows the mixture of slag and wastewater in the reaction chamber 1 to flow effectively into the filter box 2 through the discharge pipe 14.

[0037] In order to effectively mix the wastewater and slag, the rotating wheel 11 is connected to a motor. The motor is fixedly connected to the outer wall of the reaction chamber 1. The motor drives the rotating wheel 11 to rotate, which can effectively mix the wastewater and slag, effectively increase the heat generated by the wastewater, and effectively improve the heating of the wastewater by the slag.

[0038] In a further optimized design, the filter box 2 is divided into a slag storage chamber and a wastewater chamber by a filter screen 21. The wastewater chamber is located below the slag storage chamber. A cover plate 22 is provided on the top surface of the slag storage chamber. The cover plate 22 is located on one side of the reaction chamber 1 and is rotatably connected to the top surface of the filter box 2.

[0039] The filter screen 21 separates the slag from the wastewater. The slag can be easily cleaned by opening the cover 22.

[0040] The sewage chamber facilitates the collection of sewage.

[0041] The design was further optimized by sloping the bottom of the sewage chamber. This allows the sewage inside the chamber to flow towards the lower end of the chamber.

[0042] Further optimization of the scheme: the return water component includes a drain pipe 23 that is fixedly connected and communicates with the sewage chamber. One end of the drain pipe 23 extending out of the sewage chamber is fixedly connected and communicates with the inlet end of the sewage pump 24. The outlet end of the sewage pump 24 is fixedly connected and communicates with the sewage pipe 25. The sewage pipe 25 is fixedly connected and communicates with the inlet pipe 13. The inlet pipe 13 is connected to the return water pipe 16. One end of the inlet pipe 13 is connected to the sewage pipe of the waste-to-energy plant, and the other end of the inlet pipe 13 extends into the reaction chamber 1.

[0043] The sewage pump 24 transports sewage from the sewage chamber through the drain pipe 23 and then transports the sewage into the sewage pipe 25, so that the sewage in the sewage pipe 25 can effectively flow into the reaction chamber 1 through the inlet pipe 13.

[0044] Further optimization of the design involves placing the ends of the water inlet pipe 13 and the feed pipe 12 that extend into the reaction chamber 1 on the same side above the rotating wheel 11. To reduce motor power consumption, by placing the ends of the water inlet pipe 13 and the feed pipe 12 on the same side above the rotating wheel 11, when wastewater and slag fall onto the same side of the rotating wheel 11, the weight of the slag and wastewater themselves drives the rotating wheel 11 to rotate, effectively mixing the wastewater and slag and achieving sufficient cooling of the slag by the wastewater. This effectively improves energy utilization and reduces operating costs.

[0045] When the wastewater and slag cannot drive the rotating wheel 11 to rotate, and the temperature of the slag is high enough to generate steam from the wastewater, the motor can be turned on to drive the rotating wheel 11 to rotate, so that the wastewater can fully cool the slag.

[0046] To further optimize the design, a first check valve is installed at the end of the sewage pipe 25 near the inlet pipe 13. This effectively prevents sewage from flowing into the sewage pipe 25 from the inlet pipe 13.

[0047] To further optimize the design, a second one-way valve is installed at the end of the water inlet pipe 13 that extends into the reaction chamber 1. This effectively prevents steam from entering the water inlet pipe 13.

[0048] A second solenoid valve is installed at one end of the feed pipe 12 that extends into the reaction chamber 1. By closing the valve, steam is effectively prevented from entering the feed pipe 12.

[0049] The design was further optimized by setting the inlet pipe 13 at an angle, with the lower end of the inlet pipe 13 positioned inside the reaction chamber 1. This ensures that the water in the return pipe 16, after flowing into the inlet pipe 13, can effectively flow into the reaction chamber 1.

[0050] The scheme is further optimized by installing a heat exchange tube 31 inside the heat exchange chamber 3. One end of the heat exchange tube 31 extends out of the top surface of the heat exchange chamber 3 and is connected to the air outlet pipe 15. The other end of the heat exchange tube 31 extends out of the bottom of the heat exchange chamber 3 and is connected to the return water pipe 16.

[0051] The top surface of the heat exchange chamber 3 is fixedly connected to and connected to a hot water pipe 32 for conveying hot water, and the bottom of the heat exchange chamber 3 is fixedly connected to and connected to a cold water pipe 33 for conveying room temperature water.

[0052] The heat exchange tube 31 adopts a split multi-tube bundle heat pipe, which can effectively increase the heat exchange area by using a split multi-tube bundle heat pipe for heat exchange between water vapor.

[0053] Because the high-temperature water vapor generated by sewage contains impurities, it cannot be directly introduced into the generator set. The use of a separate multi-tube bundle heat pipe method achieves the isolation between the high-temperature water vapor generated by sewage and the clean high-temperature water vapor, thus preventing the high-temperature water generated by sewage from entering the turbine generator set and damaging the equipment.

[0054] Working process: Slag falls onto the rotating wheel 11 inside the reaction chamber 1 through the feed pipe 12. Simultaneously, wastewater falls onto the rotating wheel 11 inside the reaction chamber 1 through the water inlet pipe 13. When the wastewater and slag fall onto the same side of the rotating wheel 11, the weight of the slag and wastewater themselves drives the rotating wheel 11 to rotate, effectively mixing the wastewater and slag and achieving sufficient cooling of the slag by the wastewater. When the wastewater and slag cannot drive the rotating wheel 11 to rotate, and the temperature of the slag is high enough to generate steam from the wastewater, the motor can be turned on to drive the rotating wheel 11 to rotate, allowing the wastewater to fully cool the slag. At this time, the wastewater is heated by the slag to form high-temperature steam. The high-temperature steam enters the heat exchange tubes 31 inside the heat exchange chamber 3 through the steam outlet pipe 15. Meanwhile, clean room-temperature water supplied by the cold water pipe 33 enters the heat exchange chamber. The clean room-temperature water comes into contact with the heat exchange tubes 31, heating the clean room-temperature water. Water flows out through the hot water pipe. At this time, the temperature of the heat exchange tube 31 drops, causing the high-temperature steam in the heat exchange tube 31 to turn into condensate and flow into the return water pipe 16. The condensate flows from the return water pipe 16 into the inlet water pipe 13 and then into the reaction chamber 1. Several temperature sensors are installed in the reaction chamber 1. When the temperature in the reaction chamber 1 drops to the specified temperature, the first solenoid valve in the discharge pipe 14 is opened, allowing the mixture of sewage and slag to flow through the discharge pipe 14 onto the filter screen 21 in the filter box 2. The sewage flows through the filter screen 21 into the sewage chamber. At this time, the slag remains in the slag storage chamber. When the next batch of high-temperature slag enters the reaction chamber 1, the sewage pump 24 is turned on, allowing the sewage in the sewage chamber and the sewage in the inlet water pipe 13 to flow into the reaction chamber 1 together, effectively realizing the recycling of sewage. By opening the cover plate 22, the slag in the slag storage chamber can be centrally recovered.

[0055] This invention employs a wastewater recirculation method, which condenses the high-temperature wastewater vapor after heat exchange with heat exchange tube 31 into wastewater. The wastewater can then flow back into the reaction chamber 1 through the return water pipe 16 and the inlet water pipe 13, allowing the wastewater flowing into the reaction chamber 1 to cool the slag again, thus achieving effective wastewater circulation and efficient utilization of existing wastewater in waste-to-energy plants.

[0056] 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.

[0057] 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 waste heat recovery device for waste incinerator slag, characterized in that: The reaction chamber (1) is used to mix slag and wastewater. A filter box (2) is provided at the bottom of the reaction chamber (1) to separate the slag and wastewater. The filter box (2) is connected to the reaction chamber through a water return assembly. A heat exchange chamber (3) for exchanging heat with clean water is connected to the top surface of the reaction chamber (1) through an air outlet pipe (15). The bottom of the heat exchange chamber (3) is connected to the water return assembly through a water return pipe (16). A feed pipe (12) for conveying slag is fixedly connected and connected to the upper part of the side of the reaction chamber (1) away from the water return assembly.

2. The waste heat recovery device for incinerator slag according to claim 1, characterized in that: The lower part of the reaction chamber (1) is rotatably connected to a rotating wheel (11), and the bottom of the reaction chamber (1) is connected to the filter box (2) through a discharge pipe (14).

3. The waste heat recovery device for incinerator slag according to claim 2, characterized in that: The filter box (2) is divided into a slag storage chamber and a sewage chamber by a filter screen (21). The sewage chamber is located below the slag storage chamber. A cover plate (22) is provided on the top surface of the slag storage chamber. The cover plate (22) is located on one side of the reaction chamber (1) and is rotatably connected to the top surface of the filter box (2).

4. The waste heat recovery device for incinerator slag according to claim 3, characterized in that: The bottom of the sewage chamber is inclined.

5. The waste heat recovery device for waste incinerator slag according to claim 4, characterized in that: The return water assembly includes a drain pipe (23) fixedly connected and communicating with the sewage chamber. One end of the drain pipe (23) extending out of the sewage chamber is fixedly connected and communicating with the inlet end of a sewage pump (24). The outlet end of the sewage pump (24) is fixedly connected and communicating with a sewage pipe (25). The sewage pipe (25) is fixedly connected and communicating with an inlet pipe (13). The inlet pipe (13) is connected to the return water pipe (16). One end of the inlet pipe (13) is connected to the sewage pipe of the waste-to-energy plant. The other end of the inlet pipe (13) extends into the reaction chamber (1).

6. The waste heat recovery device for incinerator slag according to claim 5, characterized in that: The ends of the water inlet pipe (13) and the feed pipe (12) that extend into the reaction chamber (1) are both located on the same side above the rotating wheel (11).

7. The waste heat recovery device for incinerator slag according to claim 5, characterized in that: A first check valve is installed at one end of the sewage pipe (25) near the water inlet pipe (13).

8. The waste heat recovery device for incinerator slag according to claim 5, characterized in that: A second one-way valve is installed at one end of the water inlet pipe (13) that extends into the reaction chamber (1).

9. The waste heat recovery device for incinerator slag according to claim 5, characterized in that: The water inlet pipe (13) is inclined, and the lower end of the water inlet pipe (13) is located inside the reaction chamber (1).

10. The waste heat recovery device for incinerator slag according to claim 4, characterized in that: The heat exchange chamber (3) is provided with a heat exchange tube (31). One end of the heat exchange tube (31) extends out of the top surface of the heat exchange chamber (3) and is connected to the air outlet pipe (15). The other end of the heat exchange tube (31) extends out of the bottom of the heat exchange chamber (3) and is connected to the return water pipe (16). The top surface of the heat exchange chamber (3) is fixedly connected to and connected to a hot water pipe (32) for conveying hot water, and the bottom of the heat exchange chamber (3) is fixedly connected to and connected to a cold water pipe (33) for conveying room temperature water.

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