CN201625500U - Calcium injection flue gas desulfurization device in limestone furnace - Google Patents

Abstract

The utility model relates to a flue gas desulfurization device sprayed in a desulfurizer furnace. The device is an uninterrupted continuous spraying material operating device. The storage tank in this device is one, and the upper part of the storage tank is equipped with a high-level feeder and a dome feed valve, and the lower part is installed with a low-level feeder, and the discharge port is connected with a quantitative screw feeder and a jet pump in turn; the storage tank The upper part of the feed valve is connected to the silo. The material storage tank is connected to the material bin and the screw conveyor head through a connecting pipe, and the connecting pipe is equipped with two balance valves, which play two balancing roles in the two states of operation and feeding. The storage tank is connected to the head of the screw conveyor in the injection running state, and the storage tank is connected to the silo in the feeding state. When the low material level of the storage tank alarms during operation, the feed valve and balance valve change to the feed state to fill the storage tank with material. The utility model adopts a single storage tank feeding mode, which effectively reduces the equipment height, simplifies the system, reduces equipment investment and can also achieve the effect of traditional double tank feeding.

Description

Calcium injection flue gas desulfurization device in limestone furnace

technical field

The utility model belongs to the field of desulfurization and dust removal equipment, in particular to a calcium spraying flue gas desulfurization device in a limestone furnace.

Background technique

Calcium injection flue gas desulfurization device in limestone furnace is mainly suitable for flue gas desulfurization in coal-fired power plant boiler. The main task of the device is to complete material transportation, metering, adjustment of powder feeding amount and spraying in front of the furnace, so that the limestone powder is calcined and decomposed in the furnace, and the generated CaO is used to react with SO ₂ in the flue gas in the furnace to realize Desulfurization. The device is mainly composed of a material conveying system and a pneumatic conveying system. The material conveying system mainly includes two vertically installed storage tanks, a screw feeder and a jet pump. A silo (ash storage bin) is installed on the upper end of the tank, and the outlet of the lower storage tank is connected to a screw feeder, and the outlet of the screw feeder is connected to a jet pump, which is connected to a pneumatic conveying system. Since the high-level material gauge and the dome feed valve are installed on the upper storage tank, and the low-level material gauge and the dome feed valve are installed on the lower storage tank, the high-level material gauge, the low-level material gauge and the two dome feed valves are Under the action of the material valve, the limestone powder can be sprayed into the boiler for desulfurization under the action of the pneumatic conveying system after passing through the silo, storage tank, screw feeder and jet pump.

The desulfurization device has the following defects in use: 1. Since there is no material position monitoring device installed on the lower storage tank, it is necessary to rely on time to control the closing and opening of the dome feed valve of the lower storage tank when using double tank feeding. Therefore, there are many control points and low control accuracy, which will easily cause large feeding errors and low conveying efficiency; 2. Due to the use of two vertically installed storage tanks, the overall height of the equipment is relatively high and takes up a large space. The requirements are high, and it is not suitable for installation and use in places with a low height; 3. Due to the high height of the material conveying system and the silo connected to it, it is inconvenient to install and overhaul.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a limestone furnace with calcium flue gas spraying that is reasonably designed, can reduce the overall height of the equipment, is convenient for installation and maintenance, has high feeding accuracy, and can improve the delivery efficiency of limestone powder. Desulfurization device.

The utility model solves its technical problem and realizes through the following technical solutions:

A calcium spray flue gas desulfurization device in a limestone furnace, including a material conveying system and a pneumatic conveying system, the material conveying system includes a screw feeder, a jet pump, and a storage tank connected to a silo, and is characterized in that: the material conveying system There is one storage tank, the upper part of the storage tank is equipped with a high-level material gauge and a dome feed valve, the upper part of the dome feed valve is connected to the silo, the lower part of the storage tank is installed with a low-level material gauge, and the outlet of the storage tank The feed port is connected to the screw feeder and the jet pump in turn; the upper part of the storage tank is connected to a vertically arranged balance pipe through a connecting pipe. The upper end of the balance pipe is connected to the silo, and the lower end is connected to the screw feeder. Install an upper balance valve on the balance pipe between the connecting pipes, and install a lower balance valve on the balance pipe between the screw feeder and the connecting pipe.

Moreover, the pneumatic conveying system includes a Roots blower and a conveying pipeline.

Moreover, the screw feeder is a quantitative screw feeder.

Advantage and beneficial effect of the present utility model are:

1. There is only one storage tank in this desulfurization device, and the high-level material gauge and the low-level material gauge are respectively installed on the upper and lower parts of the storage tank, so the high-level and low-level material gauges can monitor the height of the material in the tank from time to time to ensure that the The accuracy of the material can be reduced, the error of the material can be reduced, and the conveying efficiency of the material can be improved.

2. The single-tank feeding in this desulfurization device is to release the pressure in the storage tank from the balance pipe before feeding, because the screw feeder can seal the pressure in the transportation, so it has no effect on the transportation, which solves the problem The problem that the loss of pressure in the transportation affects the transportation. Compared with the traditional equipment, although the equipment is reduced, the device can still achieve the same desulfurization and dust removal effect, and can also greatly reduce the production cost.

3. The material conveying system of this desulfurization device is changed from a vertical double-tank structure to a single-tank structure, so that the overall height of the device is greatly reduced, the height limitation of the plant is reduced, and the scope of application of the device is increased.

4. After the overall height of the desulfurization device is reduced, it is not only convenient for equipment installation and maintenance, but also makes it convenient to arrange the silo in the boiler room.

5. The utility model is a calcium-sprayed flue gas desulfurization device in a limestone furnace with reasonable design, simple structure, and convenient installation and maintenance. It can achieve the effect of traditional double tank feeding.

Description of drawings

Fig. 1 is the front view of the utility model.

Detailed ways

The utility model is described in further detail below through specific examples, the following examples are only descriptive, not limiting, and cannot limit the protection scope of the utility model with this.

A calcium spraying flue gas desulfurization device in a limestone furnace, mainly composed of a material conveying system and a pneumatic conveying system, the pneumatic conveying system includes a Roots fan 1 and a conveying pipeline 2, the material conveying system includes a screw feeder 12, a jet pump 13 and The storage tank 9 connected with the feed bin 3, the screw feeder is a quantitative screw feeder.

The innovation of the utility model is that: there is one storage tank in the material delivery system, the upper part of the storage tank is equipped with a high-level material gauge 4, an expansion joint and a dome feed valve 5, and a lower-level material is installed in the lower part of the storage tank. Counting 10, the discharge port of the storage tank is connected to the screw feeder and the jet pump successively. The outlet of the conveying pipe in the pneumatic conveying system is located at the outlet of the jet pump, so that the limestone powder can be sprayed into the boiler.

The upper tank body of the storage tank (located between the high-level material gauge and the low-level material gauge) is connected to a vertically arranged balance pipe 11 through a connecting pipe 7, and the top of the balance pipe is connected to the silo. An upper balance valve 6 is installed on the balance pipe between them; the bottom of the balance pipe is connected to the screw feeder, and a balance valve 8 is installed on the balance pipe between the screw feeder and the connecting pipe. The upper balance valve and the lower balance valve play two balancing functions in the two states of operation and unloading. The storage tank is connected to the screw feeder (screw conveyor head) in the injection running state, and the storage tank is connected to the silo in the feeding state. When the low material level of the storage tank alarms during operation, the feed valve and balance valve change to the feed state to fill the storage tank with material.

The working process of the present utility model is:

1. The upper balance valve is opened and the lower balance valve is closed at the same time;

2. The sealing ring of the dome feed valve relieves the pressure, and at the same time the feed valve opens (feed);

3. When the high-level material gauge sends out a full material signal, close the feed valve and pressurize the sealing ring at the same time;

4. The upper balance valve is closed, while the lower balance valve is opened;

5. Turn on the pneumatic conveying system (Roots blower, etc.), and turn on the screw feeder after the airflow is stable. According to the sulfur content in the flue dust, adjust the feeding amount to achieve quantitative feeding. The material (limestone powder) falls vertically from the storage tank into the screw feeder, and is pushed forward horizontally under the action of the screw feeder. , and finally sprayed into the boiler under the action of jet pump and Roots blower for desulfurization and dust removal;

6. When the low-level material meter sends out a material shortage signal, repeat 1 to 4 to realize continuous conveying.

Claims (3)

1. A calcium spray flue gas desulfurization device in a limestone furnace, comprising a material conveying system and a pneumatic conveying system, the material conveying system comprising a screw feeder, a jet pump and a storage tank connected with a feed bin, characterized in that: the material There is one storage tank in the conveying system, the upper part of the storage tank is equipped with a high-level material meter and a dome feed valve, the upper part of the dome feed valve is connected to the silo, and the lower part of the storage tank is installed with a low-level The discharge port of the feeder is connected to the screw feeder and the jet pump in turn; the upper part of the storage tank is connected to a vertical balance pipe through a connecting pipe, the upper end of the balance pipe is connected to the silo, and the lower end is connected to the screw feeder. Install an upper balance valve on the balance pipe between the warehouse and the connecting pipe, and install a lower balance valve on the balance pipe between the screw feeder and the connecting pipe. 2. The flue gas desulfurization device with calcium injection in the limestone furnace according to claim 1, characterized in that: the pneumatic conveying system includes a Roots blower and a conveying pipeline. 3. The flue gas desulfurization device with calcium injection in limestone furnace according to claim 1, characterized in that: the screw feeder is a quantitative screw feeder.