WO2021128108A1

WO2021128108A1 - Bag filter heating system for waste incineration power plant

Info

Publication number: WO2021128108A1
Application number: PCT/CN2019/128481
Authority: WO
Inventors: 赵娜娜
Original assignee: 深圳市能源环保有限公司
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-07-01

Abstract

A bag filter heating system for a waste incineration power plant, the bag filter heating system comprising bag filters (1A, 1B), induced draft systems (2A, 2B) and main heating circulation systems (3A, 3B), wherein the induced draft systems (2A, 2B) sequentially comprise, in an air flow direction, air intake pipes (2A21, 2B21), induced draft fans (2A1, 2B1), exhaust pipes (2A22, 2B22), silencers (2A3, 2B3) and induced draft system chimney-connecting pipes (2A4, 2B4), and the main heating circulation systems (3A, 3B) sequentially comprise, in the air flow direction, suction pipe interfaces (3A4, 3B4), hot-air blower suction pipes (3A21, 3B21), suction pipe valves (3A3, 3B3), hot-air blowers (3A1, 3B1) and hot-air blower exhaust pipes (3A22, 3B22). A shared hot-smoke system (4) is further provided. The shared hot-smoke system (4) comprises a shared communication pipe (4.1), wherein an inlet of the shared communication pipe (4.1) is connected to the exhaust pipes (2A22, 2B22) of the induced draft systems (2A, 2B) by means of output pipes (4A1, 4B1), and an outlet of the shared communication pipe (4.1) is respectively connected to the suction pipe interfaces (3A4, 3B4) by means of diverter pipes (4A3, 4B3). When main heaters of the bag filters (1A, 1B) often fail, the failed bag filters (1A, 1B) can be heated using the shared hot-smoke system (4) and using hot smoke of other induced draft systems (2A, 2B) that are in operation, ensuring that the failed bag filters (1A, 1B) can operate normally.

Description

Heating system of bag filter in garbage incineration power plant

Technical field

The invention relates to a flue gas waste heat recovery and utilization system, in particular to a heating system for a bag filter in a garbage incineration power plant.

Background technique

The flue gas purification treatment system of the waste incineration plant is equipped with a semi-dry reaction tower, atomizer, bag filter, activated carbon, lime slurry and other systems. The bag filter is one of the key equipment in the flue gas treatment system of waste incineration power plants. The function of the bag filter has two aspects: First, it separates the dust and solid particles in the flue gas at the inlet, and then removes the dust at the outlet. Clean gas is discharged; secondly, the dust adhering to the filter bag contains lime slurry and activated carbon, so it can continue the neutralization reaction and absorb harmful substances in the dust.

The preheating cycle of the bag filter is an important part of it. In the design, the main heater of the bag filter will preheat the middle box before the cold start, so that the temperature in the warehouse will be preheated from the ambient temperature within 8 hours. Above 140℃, the flue gas inlet and outlet doors are closed before the hot air circulation system of the bag filter is started, and the box of the bag filter is in a closed hot air self-circulation state. Only when this condition is met, the filter bag in the bag filter can achieve the best effect on the dust removal of the flue gas. At the same time, it can prevent the hot flue gas and the cold air in the dust collector from meeting and dew on the bag filter during the blowing process. hurt. However, in actual operation, it was found that the main heater of the bag filter often failed, causing the temperature of the warehouse to fail to meet the requirements.

Summary of the invention

In order to overcome the problems of the prior art, the present invention proposes a bag filter heating system for waste incineration power plants. A shared hot smoke system is provided, and the shared hot smoke system includes a shared connecting pipe, and the inlet of the shared connecting pipe is passed through Each outlet pipe is connected to the exhaust pipe of each air induction system, and the outlet of the shared communication pipe is connected to the suction pipe interface of the hot air self-circulation system of each bag filter through each branch pipe. When the main heater of the bag filter often fails and the temperature of the warehouse cannot meet the requirements, the hot smoke can be shared by the hot smoke system and the hot smoke of other air induction systems that are running can be used to remove the faulty bag dust. The filter is heated to ensure that the malfunctioning bag filter can operate normally.

The technical solution proposed by the present invention is to provide a bag filter heating system for waste incineration power plants, including a bag filter, an induced air system, and a main heating circulation system. The induced air system sequentially includes the airflow direction The air inlet pipe, the induced draft fan, the exhaust pipe, the muffler and the induced air system are connected to the chimney pipe, the inlet pipe is connected to the bag filter, and the induced air system is connected to the chimney pipe to exhaust the flue gas to the chimney; The main heating circulation system includes the suction pipe interface, the hot air suction pipe, the suction pipe valve, the hot air blower, the hot air exhaust pipe, the hot air system suction pipe and the one of the bag filter in the order of the airflow direction. The interface is connected and air is sucked from it. The hot air blower exhaust pipe is connected to the other interface of the bag filter and provides hot air to it. The hot air blower continuously supplies hot air to the bag filter, It is characterized in that a shared hot smoke system is also provided, the shared hot smoke system includes a shared communication pipe, and the inlet of the shared communication pipe is connected to the exhaust pipes of each induced air system through each outlet pipe. The outlet is connected to the suction pipe interface of each main heating circulation system through each branch pipe.

The beneficial effects of the present invention: a bag filter heating system for waste incineration power plants, by setting a shared hot smoke system, and the shared hot smoke system includes a shared connecting pipe, the inlet of the shared connecting pipe is connected to each other through each outlet pipe The exhaust pipes of each induced air system are connected, and the outlet of the shared connecting pipe is connected to the suction pipe interface of the hot air self-circulation system of each bag filter through each branch pipe. When the main heater of the bag filter often fails and the temperature of the warehouse cannot meet the requirements, the hot smoke can be shared by the hot smoke system and the hot smoke of other air induction systems that are running can be used to remove the faulty bag dust. The filter is heated to ensure that the malfunctioning bag filter can operate normally.

Description of the drawings

Figures 1 to 3 are schematic diagrams of the system layout of an embodiment of the prior art. Among them, FIG. 1 is a front view, FIG. 2 is a top view, and FIG. 3 is an enlarged schematic diagram of a partial structure.

Fig. 4 and Fig. 6 are schematic diagrams of the system layout of the first embodiment of the present invention. Among them, FIG. 4 is a front view, FIG. 5 is a top view, and FIG. 6 is an enlarged schematic view of a partial structure.

In the figure:

1A, No. 1 bag filter, 1B, No. 2 bag filter,

2A, No. 1 induced air system; 2B, No. 2 induced air system;

2A1, No. 1 induced draft fan; 2B1, No. 2 induced draft fan;

2A21, No. 1 intake pipe, 3A22, No. 1 exhaust pipe; 2B21, No. 2 intake pipe, 3B22, No. 2 exhaust pipe;

2A3, No. 1 silencer; 2B3, No. 2 silencer;

2A4 and No. 1 induced air systems are connected to the chimney pipe; 2B4 and No. 2 induced air systems are connected to the chimney pipe;

3A, No. 1 main heating circulation system; 3B, No. 2 main heating circulation system,

3A1, No. 1 hot air blower; 3B1, No. 2 hot air blower;

3A21, No. 1 hot air blower suction pipe, 3A22, No. 1 hot air blower exhaust pipe; 3B21, No. 2 hot air blower suction pipe, 3B22, No. 2 hot air exhaust pipe;

3A3, No. 1 suction pipe valve; 3B3, No. 2 suction pipe valve;

3A4, No. 1 suction pipe connection; 3B4, No. 2 suction pipe connection;

4. Sharing hot smoke system; 4.1 sharing connecting pipe;

4A1, No. 1 lead-out tube; 4B1, No. 2 lead-out tube;

4A2, No. 1 outlet pipe valve; 4B2, No. 2 outlet pipe valve;

4A3, No. 1 shunt pipe; 4B3, No. 2 shunt pipe.

Detailed ways

Figures 1 to 3 are schematic diagrams of the system layout of an embodiment of the prior art. Among them, FIG. 1 is a front view, FIG. 2 is a top view, and FIG. 3 is an enlarged schematic diagram of a partial structure. The figure shows that in the prior art, a bag filter heating system for waste incineration power plants includes No. 1 bag filter 1A, No. 2 bag filter 2B, No. 1 air induction system 2A, and No. 2 air induction system 2B , No. 1 main heating circulation system 3A, No. 2 main heating circulation system 3B.

As shown in the figure, No. 1 induced air system 2A includes No. 1 intake pipe 2A21, No. 1 induced draft fan 2A1, No. 1 exhaust pipe 2A22, No. 1 silencer 2A3, and No. 1 induced air system connected to chimney pipe 2A4 in order of airflow direction. The air inlet pipe 2A21 is connected to the bag filter, and the air induction system is connected to the chimney pipe 2A4 to discharge the flue gas to the chimney. The No. 1 main heating circulation system 3A includes No. 1 suction pipe interface 3A4, No. 1 hot air blower suction pipe 3A21, No. 1 suction pipe valve 3A3, No. 1 hot air blower 3A1, No. 1 hot air blower exhaust pipe in order of airflow direction 3A22, the No. 1 hot air system suction pipe 3A21 is connected to an interface of the No. 1 bag filter and sucks air from it, and the No. 1 hot air blower exhaust pipe 3A22 is connected to the No. 1 bag filter. The other interface is connected to and provides hot air to it, and the hot air is continuously supplied to the No. 1 bag filter via the No. 1 hot air blower 3A1.

As shown in the figure, No. 2 induced air system 2B includes No. 2 air inlet pipe 2B21, No. 2 induced draft fan 2B1, No. 2 exhaust pipe 2B22, No. 2 silencer 2B3, and No. 2 induced air system connected to chimney pipe 2B4 in order of airflow direction. The air inlet pipe 2B21 is connected to the bag filter, and the air induction system is connected to the chimney pipe 2B4 to exhaust the flue gas to the chimney. No. 2 main heating circulation system 3B includes No. 2 suction pipe interface 3B4, No. 2 hot air fan suction pipe 3B21, No. 2 suction pipe valve 3B3, No. 2 hot air fan 3B1, and No. 2 hot air exhaust pipe in order of airflow direction. 3B22, the No. 2 hot air system suction pipe 3B21 is connected to an interface of the No. 2 bag filter and sucks air from it, and the No. 2 hot air blower exhaust pipe 3B22 is connected to the No. 2 bag filter. The other interface is connected to and provides hot air to it, and the hot air is continuously provided to the No. 2 bag filter via the No. 2 hot air blower 3B1.

The figure shows that the main heater system of each bag filter of the garbage incineration system operates independently.

In the actual operation process, the flue gas inlet and outlet doors are closed before the hot air circulation system of the bag filter is started, and the box of the bag filter is in a closed hot air self-circulation state. Only when this condition is met, the filter bag in the bag filter can achieve the best effect on the dust removal of the flue gas, and at the same time, prevent the hot flue gas and the cold air in the dust collector from meeting and condensing to cause damage to the bag filter during the blowing process. . However, in actual operation, it was found that the main heater of the bag filter often failed, causing the temperature of the warehouse to fail to meet the requirements. The present invention suggests that in this example, only two bag filters and related systems are displayed, but in actual operation, the number of bag filters and related systems of the garbage incineration system exceeds two.

Figures 4-6 are schematic diagrams of the system layout of the first embodiment of the present invention. Among them, FIG. 4 is a front view, FIG. 5 is a top view, and FIG. 6 is an enlarged schematic view of a partial structure. The figure shows that, unlike the prior art, in this example, a bag filter heating system for waste incineration power plants is also provided with a shared hot smoke system 4, which includes a shared connecting pipe 4.1, The inlet of the shared connecting pipe 4.1 is connected to the exhaust pipe 2A22 of the No. 1 induced air system 2A and the exhaust pipe 2B22 of the No. 2 induced air system 2B through the No. 1 outlet pipes 4A1 and the No. 2 outlet pipe 4B1, respectively. The outlet of the connecting pipe 4.1 is connected to the No. 1 suction pipe interface 3A4 and the No. 2 suction pipe interface 3B4 via the No. 1 shunt pipes 4A3 and 4B3, respectively.

The figure shows that in this example, if the main heater of a certain bag filter often fails and the temperature of the warehouse cannot meet the requirements, the shared hot smoke system can be used to use other air induction systems that are running. The hot smoke heats the malfunctioning bag filter to ensure that the malfunctioning bag filter can operate normally.

Claims

A heating system for a bag filter in a garbage incineration power plant, comprising a bag filter, an induced air system and a main heating circulation system. The induced air system includes an air inlet pipe, an induced draft fan, an exhaust pipe, and a muffler in order of airflow direction. And the air induction system is connected to the chimney pipe, the air inlet pipe is connected to the bag filter, the air induction system is connected to the chimney pipe to discharge the flue gas to the chimney; the main heating circulation system sequentially includes the suction pipe interface in the airflow direction , Hot air blower suction pipe, suction pipe valve, hot air blower, hot air blower exhaust pipe, the hot air system suction pipe is connected to an interface of the bag filter and sucks air from it, the hot air blower exhausts The pipe is connected to the other interface of the bag filter and provides hot air to it, and the hot air is continuously provided to the bag filter through the hot air blower. The feature is that a shared hot smoke system is also provided. The shared hot smoke system includes a shared communicating pipe, the inlet of the shared communicating pipe is connected to the exhaust pipe of each induced air system through each outlet pipe, and the outlet of the shared communicating pipe is connected to each main heating circulation system through each branch pipe. Air duct interface connection.