Garbage unfreezing device

Abstract

A garbage inlet and a smoke outlet are formed in the top of the garbage unfreezing device, a hot smoke inlet and a discharging port are formed in the bottom of the garbage unfreezing device, small trays and large trays are distributed in the garbage unfreezing device in a staggered mode in the height direction, the large trays are in a hollow circular ring shape, the small trays are in a disc shape, and the diameter of the small trays is between the diameter of the inner ring and the diameter of the outer ring of the large trays. Hot water coils are arranged in the small tray and the large tray, inlets of the hot water coils are connected with a water supply pipe through water supply hoses, and outlets of the hot water coils are connected with a water return pipe through water return hoses; and rotary scrapers are arranged above the small tray and the large tray. The garbage can be promoted to deice, the garbage heap fermentation and water filtration time is shortened, the problems of more garbage ash, more ice blocks, low heat value and difficulty in ignition in winter in the north are solved, and the power generation efficiency of a garbage incineration power plant is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of garbage processing equipment, and specifically relates to a garbage thawing device. Background Art

[0002] Municipal solid waste power plants need to store and ferment waste to increase its calorific value. According to the design specifications of municipal solid waste incineration power plants and the rationality of the design itself, it is generally required that the storage and fermentation time of waste should not exceed 5-7 days, otherwise it will affect the rationality of the entire plant's land area, investment and operation.

[0003] In winter, garbage in northern cities has the characteristics of high ash content, many ice cubes and low calorific value. It is impossible to thaw and ferment the garbage within the specified storage time, which reduces the efficiency of the incinerator and increases the operating cost. Therefore, the power plant will process the frozen garbage by: ① directly spraying hot air or steam on the frozen garbage, which wastes steam, consumes a lot of energy, and cannot penetrate deep into the garbage, resulting in poor thawing effect; ② using incinerator oil spray to assist combustion, which increases costs and wastes energy; ③ adding hot water to the garbage storage room to thaw the garbage, but this method has low heating efficiency, slow garbage fermentation speed, and greatly increases the output of leachate and the cost of leachate treatment.

[0004] In summary, waste incineration power plants in the north have difficulty operating in winter, and there is no efficient, direct and economical way to accelerate the thawing, fermentation and filtration of garbage and improve the power generation efficiency of waste incineration power plants. Utility Model Content

[0005] Technical problems solved: In response to the above technical problems, the utility model provides a garbage thawing device, which can promote the melting of garbage, shorten the fermentation and water filtration time of garbage piles, solve the difficult problems of high ash content, large amounts of ice, low calorific value and difficulty in ignition in northern winter garbage, and improve the power generation efficiency of garbage incineration power plants.

[0006] Technical solution: A garbage thawing device, with a garbage inlet and a smoke outlet on the top, a hot smoke inlet and a discharge port on the bottom, and small trays and large trays staggeredly distributed inside along the height direction, the large tray is a hollow ring shape, the small tray is a disc shape, and its diameter is between the inner and outer ring diameters of the large tray; hot water coils are provided in the small tray and the large tray, the inlet of the hot water coil is connected to the water supply pipe through a water supply hose, and the outlet is connected to the return pipe through a return hose; rotating scrapers are provided above the small tray and the large tray.

[0007] Preferably, the rotating scraper above the small tray is inclined toward the center of the small tray, and the rotating scraper above the large tray is inclined away from the center of the large tray.

[0008] Preferably, the garbage inlet is also provided with a crusher.

[0009] Preferably, the garbage inlet faces the highest small tray, and the discharge port faces the center of the lowest large tray.

[0010] Preferably, the discharge port is a discharge hopper.

[0011] Preferably, the device further comprises a conveyor belt arranged below the discharge port.

[0012] Preferably, the device is arranged in a garbage bin of a waste incineration power plant.

[0013] Preferably, the hot flue gas inlet is connected to the purified flue gas outlet of the waste incineration power plant through a pipeline, and the flue gas outlet is connected to the secondary air inlet of the incinerator of the waste incineration power plant through a pipeline.

[0014] Preferably, a heat pump is provided between the water supply pipe and the water return pipe.

[0015] Beneficial effects: The utility model thaws the frozen garbage by initially crushing it and then heating it with the treated flue gas and the hot disc (containing a hot water coil) at the same time. The scraper pushes the garbage to turn over and flexibly adjusts the rotation speed and residence time to thaw the frozen garbage, ensuring the fermentation and water filtration effect of the garbage pile, and returns the cooled flue gas to the secondary air inlet, reducing the NO in the furnace. x The generation of waste incineration power generation can improve the efficiency of waste incineration power generation while reducing pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 The schematic diagram of the top view of the small tray (left) and the large tray (right);

[0018] The meanings of the numbers in the figure are as follows: 1. Garbage inlet, 2. Smoke outlet, 3. Hot smoke inlet, 4. Discharge port, 5. Small tray, 6. Large tray, 7. Water supply pipe, 8. Return pipe, 9. Rotating scraper, 10. Conveyor belt. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. Example 1

[0020] like Figure 1 and Figure 2As shown, a garbage thawing device is arranged in the garbage bin of the garbage incineration power plant, with a garbage inlet 1 and a flue gas outlet 2 on the top, a hot flue gas inlet 3 and a discharge port 4 on the bottom, and small trays 5 and large trays 6 are staggeredly distributed inside along the height direction. The large tray 6 is a hollow annular ring, and the small tray 5 is a disc, and its diameter is between the inner and outer ring diameters of the large tray 6; hot water coils are arranged in the small tray 5 and the large tray 6, and the inlet of the hot water coil is connected to the water supply pipe 7 through a water supply hose, and the outlet is connected to the return pipe 8 through a return hose; a rotating scraper 9 is arranged above the small tray 5 and the large tray 6. The discharge port 4 adopts a discharge hopper, and a conveyor belt 10 is arranged below the discharge port 4, and the thawed garbage is conveyed to the garbage fermentation area.

[0021] The thawing process is as follows:

[0022] The frozen garbage is put into the garbage inlet 1 by using a grab bucket, and the frozen garbage falls onto the adjacent small tray 5. The rotating scraper 9 rotates and turns the garbage, stirring the garbage and dropping it onto the adjacent large tray 6. Similarly, under the stirring of the rotating scraper 9, the garbage falls step by step and is finally discharged from the discharge port 4. Since both the small tray 5 and the large tray 6 are equipped with hot water coils, heat can be provided for the frozen garbage. The number of trays can be adjusted according to the actual situation of different projects. The operating load can be adjusted by controlling the rotation speed and the number of trays to fully thaw the frozen garbage. At the same time, the hot countercurrent flue gas provided at the hot flue gas inlet 3 contacts and exchanges heat with the frozen garbage.

[0023] This device replaces the existing methods of pouring hot water, directly spraying steam or spraying oil in the furnace to assist combustion, ensuring the full thawing and fermentation of frozen garbage, improving the calorific value, and ensuring the stability and load of the incinerator. At the same time, the power consumption of this crushing device adopts the self-generated power (green electricity) of the garbage power plant, achieving the purpose of energy saving, consumption reduction and efficiency improvement.

[0024] In a specific application mode, the rotating scraper 9 above the small tray 5 is inclined toward the center of the small tray 5, and the rotating scraper 9 above the large tray 6 is inclined away from the center of the large tray 6. The scrapers with different inclinations scrape the garbage, causing the garbage to flip and move on the large and small trays, and fully thaw.

[0025] The garbage inlet 1 is also provided with a crusher, and crushing the frozen garbage in advance can effectively speed up the thawing rate.

[0026] The garbage inlet 1 faces the highest small tray 5 , and the discharge port 4 faces the center of the lowest large tray 6 , which can ensure that the garbage passes through each level of tray in sequence instead of falling directly into the discharge port 4 .

[0027] The hot flue gas inlet 3 is connected to the outlet of the purified flue gas of the waste incineration power plant through a pipeline, and the flue gas outlet 2 is connected to the secondary air inlet of the incinerator of the waste incineration power plant through a pipeline. The treated flue gas is used to completely replace the secondary air after thawing, which saves costs. At the same time, it does not change the furnace wall air duct, does not affect the original air distribution structure in the furnace, and has little impact on the operation of the built project. Part of the flue gas (above 120°C) treated by the flue gas purification system of the power plant changes its discharge path into the chimney and is reused from the induced draft fan to this device. The flue gas enters from the bottom of the thawing device and flows out from the top to recover the waste heat and thaw the frozen garbage. On the other hand, the treated flue gas is low-temperature and low-oxygen. After entering the incinerator, it reduces the oxygen content and local temperature in the combustion zone, enhances the reducing atmosphere, and curbs NO x Generation of.

[0028] A heat pump is provided between the water supply pipe 7 and the return pipe 8. The water supply pipe 7 provides hot water to the coil in the tray. The hot water exchanges heat with the garbage indirectly. The low-temperature water after thawing the frozen garbage enters the return pipe 8, and enters the water supply pipe 7 again after being heated by the heat pump, thereby realizing the recycling of water resources.

Claims

1. A garbage thawing device, characterized in that: A garbage inlet (1) and a smoke outlet (2) are provided at the top, a hot smoke inlet (3) and a discharge port (4) are provided at the bottom, and small trays (5) and large trays (6) are staggeredly distributed inside along the height direction, the large tray (6) is a hollow ring, and the small tray (5) is a disc, and its diameter is between the inner and outer ring diameters of the large tray (6); hot water coils are provided inside the small tray (5) and the large tray (6), the inlet of the hot water coil is connected to the water supply pipe (7) through a water supply hose, and the outlet is connected to the water return pipe (8) through a water return hose; and a rotating scraper (9) is provided above the small tray (5) and the large tray (6).

2. A garbage thawing device according to claim 1, characterized in that: The rotating scraper (9) above the small tray (5) is inclined toward the center of the small tray (5), and the rotating scraper (9) above the large tray (6) is inclined toward a direction away from the center of the large tray (6).

3. A garbage thawing device according to claim 1, characterized in that: The garbage inlet (1) is also provided with a crusher.

4. A garbage thawing device according to claim 1, characterized in that: The garbage inlet (1) faces the small tray (5) at the highest point, and the discharge port (4) faces the center of the large tray (6) at the lowest point.

5. The garbage thawing device according to claim 1, characterized in that: The discharge port (4) is a discharge hopper.

6. The garbage thawing device according to claim 1, characterized in that: The device also includes a conveyor belt (10) arranged below the discharge port (4).

7. The garbage thawing device according to claim 1, characterized in that: The device is arranged in a garbage bin of a garbage incineration power plant.

8. The garbage thawing device according to claim 1, characterized in that: The hot flue gas inlet (3) is connected to the purified flue gas outlet of the waste incineration power plant through a pipeline, and the flue gas outlet (2) is connected to the secondary air inlet of the incinerator of the waste incineration power plant through a pipeline.

9. The garbage thawing device according to claim 1, characterized in that: A heat pump is provided between the water supply pipe (7) and the water return pipe (8).

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