CN118543185A - A system and operation mode suitable for demisting slag bin in waste incineration power plant - Google Patents

Abstract

The present invention belongs to the technical field of garbage disposal, and in particular, is a system and operation mode suitable for demisting the slag bin of a garbage incineration power plant, including a spray washing tower, a cooling tower, a heating tower, and a steam heater connected in sequence, an induced draft fan is provided at the end of the steam heater to provide airflow power, and the front end of the spray washing tower is connected to the slag bin to absorb air containing a large amount of ash particles and water mist; a spray head is provided in the spray washing tower, and a packing layer is arranged at the outlet; a temperature control system is provided on the cooling tower and the heating tower, a cooling component is provided in the cooling tower, and a heating component is provided in the heating tower; the steam heater is connected to an external steam heat source. After the garbage bin is demisted by the technical solution of the present invention, the working environment of the slag pit workshop can be effectively improved, so that the slag pit workshop is no longer foggy, and the operation of the slag pit grab is not affected, and the working life of the slag pit grab can also be effectively extended.

Description

A system and operation mode suitable for demisting slag bin in waste incineration power plant

Technical Field

The invention belongs to the technical field of garbage disposal, and in particular to a system and an operation mode suitable for demisting a slag bin in a garbage incineration power plant.

Background Art

A large amount of bottom ash is generated after waste incineration. Due to the high temperature of the bottom ash and the need for a certain degree of sealing of the slag discharge port of the incinerator to prevent smoke leakage, domestic waste incineration usually adopts a wet slag discharge solution, that is, the bottom ash after combustion falls into a slag scoop filled with a certain amount of water, and is pushed by the slag scoop to be discharged into the slag pit together with the water used to cool the bottom ash. The bottom ash still has a high temperature (higher than the ambient temperature) after cooling, and will exchange heat with the water used to cool the bottom ash in the slag pit to produce a large amount of steam. Therefore, the plant where the slag pit is located is usually filled with a large amount of water mist. At the same time, the fine bottom ash will also be lifted up during the slag discharge process, causing the plant where the slag pit is located to be filled with water mist and fine ash particles, affecting the operating line of sight of the grab above the slag pit, and also seriously affecting the service life of the grab above the slag pit.

Previously, we simply used the method of exhaust and ventilation to reduce the fog in the factory building where the slag pit was located. The air in the slag pit factory building was directly extracted and discharged after removing the water mist through an ordinary packing tower. However, environmental protection supervision is now strict. If external discharge is required, an online smoke detection system needs to be installed, and the external exhaust gas may not meet the standards.

Patent CN217340653U provides a water bath dust removal washing equipment and a waste incineration slag bin water bath dust removal system, which reduces the dust content of the slag bin air through three-stage spraying to achieve the purpose of purifying the slag bin air. However, this technical solution only uses the spray dust removal technology, which does not have a good removal effect on the water mist in the slag bin. On the contrary, the temperature of the circulating air is reduced after spraying, and the humidity is further increased. After the circulating air is sent back to the slag bin, it will further aggravate the generation of slag bin mist.

Summary of the invention

The purpose of the present invention is to solve the problems existing in the prior art and to propose a system and operation mode suitable for demisting a slag bin in a waste incineration power plant.

In order to achieve the above object, the present invention adopts the following technical solutions:

A system for demisting slag bins in waste incineration power plants, comprising a spray scrubber, a cooling tower, a heating tower, and a steam heater connected in sequence, an induced draft fan being provided at the end of the steam heater to provide airflow power, and a front end of the spray scrubber being connected to the slag bin to absorb air containing a large amount of ash particles and water mist;

The air is introduced from the spray scrubber near the bottom. A spray head is provided in the spray scrubber, and water is supplied from an external water source to the spray head. A packing layer is arranged at the outlet of the upper part of the spray scrubber.

The cooling tower and the heating tower are provided with a temperature control system, which cools down the cooling tower and raises the temperature in the heating tower. The upper inlet of the cooling tower is connected to the upper outlet of the spray washing tower, and the lower outlet of the cooling tower is connected to the lower inlet of the heating tower.

The steam heater is connected to an external steam heat source, and the steam heater inlet is connected to the upper outlet of the heating tower.

As a further preferred solution, the temperature control system includes a compressor, a throttle valve, a condensing pipe, and an evaporating pipe, wherein the compressor and the throttle valve are located outside, the evaporating pipe is in a cooling tower, and the condensing pipe is in a heating tower.

As a further preferred solution, the external water source is a circulating water tank, and the water in the circulating water tank is pumped into the sprinkler head through a circulating water pump;

The bottom of the spray scrubber and the bottom of the cooling tower are both equipped with return pipes connected to the circulating water tank;

The circulating water tank is also connected to the slag pit.

As a further preferred embodiment, the steam heat source is a boiler or a steam turbine.

An operating mode of a system for demisting a slag bin in a waste incineration power plant comprises the following steps:

Step 1: The air from the slag bin contains a large amount of ash particles and water mist. It first enters the equipment from the lower part of the spray washing tower. Under the action of the spray, the ash particles and some fine water droplets are washed by the spray water, and then the air passes through the packing layer to further reduce the water mist content in the air;

Step 2: The air with preliminary dust and mist removal enters the cooling tower from the top. There are low-temperature heat exchange pipes inside the cooling tower. When the wet air flows through the low-temperature heat exchange pipes, the temperature drops, and the water vapor in the wet air further condenses into liquid water and is discharged from the bottom of the cooling tower;

Step 3: The cooled wet air enters the bottom of the heating tower from the bottom of the cooling tower. The heating tower has a high-temperature heat exchange tube. The dehumidified air is heated by the high-temperature heat exchange tube and then discharged into the steam heater.

Step 4: After further heating by the steam heater, it is sent back to the slag bin by the induced draft fan.

The present invention provides a system and operation mode for demisting and dust removal of slag bins in waste incineration power plants. Through water washing and spraying, cooling and dehumidifying, heating and other processes, water mist and particulate matter in the slag bin plant can be removed. Internal circulation is adopted without causing any smoke to be discharged. Wastewater generated by the operation of the system is directly discharged into the slag pit for collaborative treatment. The structure of the present invention is simple. After the garbage bin is demisted by the technical solution of the present invention, the working environment of the slag pit plant can be effectively improved, so that the slag pit plant is no longer foggy, and the operation of the slag pit grab is not affected. At the same time, the working life of the slag pit grab can also be effectively extended.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

In the figure: 1. spray washing tower, 2. cooling tower, 3. heating tower, 4. steam heater, 5. induced draft fan, 6. spray head, 7. circulating water tank, 8. packing layer, 9. compressor, 10. throttle valve, 11. condensation pipe, 12. evaporation pipe, 13. circulating water pump.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

A system for demisting a slag bin in a waste incineration power plant, comprising a spray scrubber 1, a cooling tower 2, a heating tower 3, and a steam heater 4 connected in sequence, wherein an induced draft fan 5 is provided at the end of the steam heater 4 to provide airflow power, and the front end of the spray scrubber 1 is connected to the slag bin to absorb air containing a large amount of ash particles and water mist;

Air is introduced from the spray washing tower 1 near the bottom. A spray head 6 is provided in the spray washing tower 1. The spray head 6 is supplied with water from an external water source. A packing layer 8 is arranged at the upper outlet of the spray washing tower 1.

The cooling tower 2 and the heating tower 3 are provided with a temperature control system. The cooling tower 2 is a cooling component of the temperature control system, and the heating tower 3 is a heating component of the temperature control system. The upper inlet of the cooling tower 2 is connected to the upper outlet of the spray washing tower 1, and the lower outlet of the cooling tower 2 is connected to the lower inlet of the heating tower 3.

Specifically, the temperature control system includes a compressor 9, a throttle valve 10, a condensing pipe 11 (a low-temperature heat exchange pipe), and an evaporating pipe 12 (a high-temperature heat exchange pipe), wherein the compressor 9 and the throttle valve 10 are located outside, the evaporating pipe 12 is located in the cooling tower 2, and the condensing pipe 11 is located in the heating tower 3;

The condensing pipe 11 and the evaporating pipe 12 use a refrigerant circulating medium (such as R32, R410a, etc.), which is driven by the compressor and the throttle valve for heat exchange. The gas phase refrigerant is compressed by the compressor and condensed into a liquid phase with a high temperature. It flows through the heat exchange pipe in the heating tower to heat the air. After throttling by the throttle valve, the pressure is reduced, and the liquid phase expands into the gas phase, the temperature is reduced, and the air is cooled in the cooling tower, and then returns to the compressor to complete a cycle.

The steam heater 4 is connected to an external steam heat source, and an inlet of the steam heater 4 is connected to an upper outlet of the heating tower 3 .

The external water source is a circulating water tank 7, and the water in the circulating water tank 7 is pumped into the sprinkler head 6 through a circulating water pump 13;

The bottom of the spray washing tower 1 and the bottom of the cooling tower 2 are both provided with return pipes connected to the circulating water tank 7;

The circulating water tank 7 is also externally connected to a slag pit, and waste water is discharged regularly, and the cooling water in the cooling tower can be sent to the slag pit together.

The steam heat source is a boiler or a steam turbine, which can be flexibly selected according to the heating requirements, and the heated steam is sent back to the boiler steam-water system.

An operating mode of a system for demisting a slag bin in a waste incineration power plant comprises the following steps:

Step 1: The air from the slag bin contains a large amount of ash particles and water mist. The air from the slag bin is about 25°C and the relative humidity is about 100%. It first enters the equipment from the lower part of the spray washing tower 1. Under the action of spraying, the ash particles and some fine water droplets are washed by the spray water. After passing through the spray washing tower, the temperature is reduced to 20°C and the relative humidity is about 100%. Then the air passes through the packing layer 8 to further reduce the water mist content in the air.

Step 2: The air with preliminary dust and mist removal enters the cooling tower 2 from the top. The cooling tower 2 has a low-temperature heat exchange tube inside. The wet air flows through the low-temperature heat exchange tube, and the temperature is further reduced to 8-10°C, and the relative humidity is 100%. The water vapor in the wet air is further condensed into liquid water and discharged from the bottom of the cooling tower 2 to achieve water removal;

Step 3: The cooled wet air enters the bottom of the heating tower 3 from the bottom of the cooling tower 2. The heating tower 3 has a high-temperature heat exchange tube. The air temperature rises to about 23°C after passing through the heating tower 3, and the relative humidity is about 45-55%. The dehumidified air is heated by the high-temperature heat exchange tube and discharged into the steam heater 4.

Step 4: After further heating by the steam heater 4, the induced draft fan 5 is sent back to the slag bin, which can increase the temperature of the air in the slag bin, reduce the relative humidity, and effectively prevent the formation of fog.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (5)

1. The utility model provides a system suitable for waste incineration power plant sediment storehouse defogging which characterized in that: the device comprises a spray washing tower (1), a cooling tower (2), a heating tower (3) and a steam heater (4) which are sequentially connected, wherein an induced draft fan (5) is arranged at the tail end of the steam heater (4) to provide airflow power, and the front end of the spray washing tower (1) is communicated with a slag bin to absorb air containing a large amount of ash particles and water mist;

Air is introduced from a position, close to the bottom, of the spray washing tower (1), a spray header (6) is arranged in the spray washing tower (1), the spray header (6) is supplied with water by an external water source, and a filler layer (8) is arranged at an outlet at the upper part of the spray washing tower (1);

temperature control systems are arranged on the cooling tower (2) and the heating tower (3), the temperature control systems cool the inside of the cooling tower (2), heat the inside of the heating tower (3), an upper inlet of the cooling tower (2) is communicated with an upper outlet of the spray washing tower (1), and a lower outlet of the cooling tower (2) is communicated with a lower inlet of the heating tower (3);

the steam heater (4) is connected with an external steam heat source, and the inlet of the steam heater (4) is communicated with the outlet at the upper part of the heating tower (3).

2. A system suitable for demisting a slag bin of a waste incineration power plant according to claim 1, characterized in that: the temperature control system comprises a compressor (9), a throttle valve (10), a condensing pipeline (11) and an evaporating pipeline (12), wherein the compressor (9) and the throttle valve (10) are positioned outside, the evaporating pipeline (12) is positioned in the cooling tower (2), and the condensing pipeline (11) is positioned in the heating tower (3).

3. A system suitable for demisting a slag bin of a waste incineration power plant according to claim 1, characterized in that: the external water source is a circulating water tank (7), and water in the circulating water tank (7) is pumped into the spray header (6) through a circulating water pump (13);

the bottom of the spray washing tower (1) and the bottom of the cooling tower (2) are respectively provided with a reflux pipeline connected with a circulating water tank (7);

the circulating water tank (7) is also externally connected with a slag pit.

4. A system suitable for demisting a slag bin of a waste incineration power plant according to claim 1, characterized in that: the steam heat source is a boiler or a steam turbine.

5. The method of operation of a system for demisting a waste incineration plant slag silo according to any of claims 1-4, comprising the steps of:

Step one: the air from the slag bin contains a large amount of ash particles and water mist, firstly, the ash particles and part of fine water drops enter the equipment from the lower part of the spray washing tower (1) and are washed by spray water under the action of spraying, and then the air passes through the filler layer (8) to further reduce the water mist content in the air;

Step two: the air with preliminary dedusting and demisting enters a cooling tower (2) from the upper part, a low-temperature heat exchange tube is arranged in the cooling tower (2), when the wet air flows through the low-temperature heat exchange tube, the temperature is reduced, water vapor in the wet air is further condensed into liquid-phase water, and the liquid-phase water is discharged from the bottom of the cooling tower (2);

Step three: the cooled wet air enters the bottom of a heating tower (3) from the bottom of a cooling tower (2), a high-temperature heat exchange tube is arranged in the heating tower (3), and the dehumidified air is discharged into a steam heater (4) after being heated by the high-temperature heat exchange tube;

step four: further heating by a steam heater (4), and returning to the slag bin by an induced draft fan (5).