CN102732325A - High-pressure and high-temperature furnace slag wind and water cooling and deslagging device - Google Patents

Abstract

The invention discloses a high-pressure and high-temperature furnace slag air-water co-cooling slag discharge device, which comprises a high-pressure desuperheating tank, a pressure buffer tank, a normal-pressure conveying tank and a conveying injector; Loosening wind device in the middle of the temperature tank, cooling coil heat exchanger, loosening wind device for the cone of the high-pressure desuperheating tank and double valves for the high-pressure desuperheating tank, the atmospheric pressure delivery tank includes a normal pressure tank body, a cone loosening wind device for the normal pressure tank The device and the double valve of the atmospheric tank, the conveying injector includes an air supply pipeline, an injector and an output pipeline. The high-pressure and high-temperature slag air-water co-cooling slag discharge device in the present invention effectively solves the decompression and temperature reduction in high-pressure and high-temperature environments and realizes the intermittent discharge of slag, and has automatic control, high-efficiency cooling, energy saving and periodic continuous production. It can adapt to the production needs of large-scale coal gasification process.

Description

A high-pressure and high-temperature furnace slag air-water co-cooling slag discharge device

technical field

The invention relates to a high-pressure, high-temperature furnace slag air-water co-cooling slag discharge device, in particular to a high-pressure, high-temperature bottom slag discharge and cooling system and device in a fluidized bed coal gasification furnace.

Background technique

China's primary energy is mainly coal, most of which is used for power generation in the form of combustion. With the increasingly stringent emission control standards of air pollutants and the needs of national economic development, high-temperature and high-pressure coal gasification has gradually become the main utilization method of clean coal technology and polygeneration technology. For conventional coal combustion furnaces, the existing mature technology is used under normal pressure conditions to cool the high-temperature slag particles through a heat exchanger and then discharge them out of the furnace, but for the environment in the high-pressure high-temperature fluidized bed coal gasifier, it is difficult to directly adopt Conventional slag cooling methods and technical discharge. Therefore, the development of a slag discharge technology device that can adapt to the high-pressure and high-temperature environment is one of the key issues in the development of high-pressure and high-temperature fluidized bed coal gasification technology.

Contents of the invention

The object of the present invention is to provide a high-pressure, high-temperature furnace slag air-water co-cooling slag removal device for the slagging problem of a high-pressure, high-temperature fluidized bed coal gasifier, so as to realize continuous and safe operation and production of the coal gasifier.

The technical solution adopted in the present invention is: a high-pressure high-temperature slag air-water co-cooling slag discharge device, including a high-pressure desuperheating tank, a pressure buffer tank, a normal-pressure delivery tank and a delivery injector;

The high-pressure desuperheating tank includes a high-pressure desuperheating tank body, a loosening wind device in the middle of the high-pressure desuperheating tank, a cooling coil heat exchanger, a loosening wind device for the cone of the high-pressure desuperheating tank and double valves of the high-pressure desuperheating tank. The middle part of the high-pressure desuperheating tank is equipped with a loosening wind device in the middle of the high-pressure desuperheating tank and a cooling coil heat exchanger. The bottom of the tank is connected to the double valve of the high pressure desuperheating tank;

The pressure buffer tank includes a buffer tank body, a buffer tank cone loosening wind device and a double valve of the buffer tank. The buffer tank cone loosening wind device is installed on the lower cone part of the buffer tank body. It is connected with the double valve of the buffer tank;

The atmospheric transport tank includes an atmospheric tank body, an atmospheric tank cone loosening wind device and an atmospheric tank double valve, and the atmospheric tank cone loosening wind device is installed on the lower cone of the atmospheric tank body. The bottom end of the atmospheric tank is connected to the double valve of the atmospheric tank;

The conveying injector includes an air supply pipeline, an injector and an output pipeline, one end of the injector is connected to the air supply pipeline, and the other end is connected to the output pipeline;

The high-pressure desuperheating tank is connected to the top of the pressure buffer tank through the double valves of the high-pressure desuperheating tank. Injector connection for injector.

Preferably, the slag discharge device further includes a fine slag collection silo, the fine slag collection silo includes a first valve, a second valve, a cyclone separator and a storage bin, and the cyclone separator is connected to the The buffer tank body of the pressure buffer tank is connected, a first valve is provided on the pipeline, a second valve is provided on the pipeline connecting the cyclone separator with the outside world, and the bottom of the cyclone separator is connected with the storage bin.

Preferably, a pressure balance pipe is provided between the high-pressure desuperheating tank and the buffer tank, and the pressure balance pipe is provided with a third valve and a fourth valve for pressure balance adjustment.

Preferably, the cooling medium of the cooling coil heat exchanger is liquid or gas, which may be water or air.

The high-pressure working pressure of the present invention is above 1MPa, and the temperature is above 800°C. The middle loose wind and the cone loose wind in the high-pressure desuperheating tank do not react with the slag. The high-temperature slag enters from the inlet of the high-pressure desuperheating tank, sprays out from the outlet of the conveying injector, and is sent to the slag bin. Part of the slag is stored in the storage bin. The heat exchange of the air-water cooling medium in the high-pressure desuperheating tank cools the high-temperature slag to the transportable temperature.

Beneficial effect: the present invention has the following advantages:

1) The present invention realizes the intermittent cooling, discharge and transportation of the slag in the high-pressure and high-temperature gasification furnace through the mutual cooperation among the high-pressure desuperheating tank, the pressure buffer tank and the normal-pressure delivery tank.

2) Fluidizing air that does not react with slag is fed into the cones of the three tanks respectively to prevent slag from clogging in the tank and achieve smooth flow of slag in the entire system.

3) A pressure balance pipe is connected between the high-pressure desuperheating tank and the pressure buffer tank to ensure that the pressure in the buffer tank is finally balanced with the pressure in the high-pressure desuperheating tank.

3) The high-temperature slag cooling is mainly carried out in the high-pressure desuperheating tank. The high-temperature slag is cooled to 250~350°C through efficient heat exchange between the high-temperature hot slag and the cooling medium in the cooling coil heat exchanger.

4) The fine slag collection bin can prevent the discharge of fine particles and protect the environment.

To sum up, the high-pressure and high-temperature slag air-water co-cooling slag discharge device in the present invention effectively solves the pressure reduction and temperature reduction under high pressure and high temperature environment and realizes the intermittent discharge of slag, and has the advantages of automatic control, high-efficiency cooling, and energy saving. Moreover, it has many advantages such as periodic continuous production capacity, which can meet the production needs of large-scale coal gasification process.

Description of drawings

Fig. 1 is a schematic structural view of a high-pressure, high-temperature slag slag discharge device with air-water co-cooling according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1: a high-pressure high-temperature slag wind-water co-cooling slag discharge device is composed of a high-pressure desuperheating tank 1, a pressure buffer tank 2, an atmospheric pressure delivery tank 3, a delivery injector 4 and a fine slag collection bin 5. High-pressure desuperheating tank 1 consists of high-pressure desuperheating tank body 6, high-pressure desuperheating tank middle loose air device 7, cooling coil heat exchanger 8, high-pressure desuperheating tank cone loosening wind device 9, high-pressure desuperheating tank double valve 10, The pressure balance pipe 11 is composed of the pressure balance pipe 11; the double valve 10 of the high pressure desuperheating tank is composed of the fifth valve 14 and the sixth valve 15; 18 components; the normal pressure delivery tank 3 is made up of the normal pressure tank body 19, the normal pressure tank cone loosening device 20, and the double valve 21 of the normal pressure tank; Composition; the fine slag collection bin 5 is composed of a first valve 25 , a second valve 26 , a cyclone separator 27 and a storage bin 28 . The high-pressure desuperheating tank 1 is connected to the buffer tank 2 through the double valve 10 of the high-pressure desuperheating tank, the pressure buffer tank 2 is connected to the normal pressure delivery tank 3 through the double valve 18 of the buffer tank, and the normal pressure delivery tank 3 is connected to the normal pressure tank 2 through the double valve 21 of the normal pressure tank. Delivery injector 4 connection. High pressure working pressure above 1MPa, temperature above 800℃. The cooling medium of the cooling coil heat exchanger 8 in the high-pressure desuperheating tank 1 is water or air. The loose air in the middle of the high-pressure desuperheating tank and the loose air in the cone of the high-pressure desuperheating tank do not react with the slag. There is a pressure balance pipe 11 between the high pressure desuperheating tank 1 and the pressure buffer tank 2, on which there is a third valve 12 and a fourth valve 13 for pressure balance adjustment. The pressure buffer tank 2 is connected with the fine slag collection bin 5 . The high-temperature slag enters from the inlet A of the high-pressure desuperheating tank 1, and is ejected from the outlet B of the conveying injector 4 to the slag bin. Part of the slag is stored in the storage bin 28 . The heat exchange of the cooling medium cools the high temperature slag to the delivery temperature.

The specific operation steps of the high-pressure and high-temperature furnace slag air-water co-cooling slag discharge device of the present invention are as follows:

(1) Start the operation. Close the double valves 10 of the high-pressure desuperheating tank, store the cold slag in the tank in advance, and simultaneously feed the cooling medium (water) into the cooling coil heat exchanger 8 continuously. Under working conditions, the hot slag enters the high-pressure desuperheating tank 1 through the inlet A from the fluidized bed coal gasifier with a high temperature above 800°C and a high pressure above 1MPa. Turn on the loosening wind device 7 in the middle of the high-pressure desuperheating tank and the loosening wind device 9 on the cone of the high-pressure desuperheating tank, so that the cold slag is in a micro-fluidized state, so that the slag flows smoothly and continues to cool during the descent.

(2) Stamping operation. Close the third valve 12 , the fourth valve 13 , the first valve 25 and the second valve 26 , and pressurize the gas into the pressure buffer tank 2 until the pressure of the high-pressure desuperheating tank 1 is balanced. The third valve 12 and the fourth valve 13 are opened, so that the pressures in the pressure buffer tank 2 and the high-pressure desuperheating tank 1 are balanced. Open the double valve 10 of the high-pressure desuperheating tank, and the cooling slag in the high-pressure desuperheating tank 1 enters the pressure buffer tank 2 under the action of the cone loosening wind device 9 of the high-pressure desuperheating tank, and continues to flow into the cooling coil heat exchanger 8 at this time. Feed into the cooling medium, and open the loose air device 7 in the middle of the high-pressure desuperheating tank. When the cold slag in the pressure buffer tank 2 reaches a predetermined height, the double valves 10 of the high-pressure desuperheating tank are closed, and the third valve 12 and the fourth valve 13 are closed. Go to step (1).

(3) Pressure relief operation. Close the double valve 18 of the pressure buffer tank, open the first valve 25 and the second valve 26, and start to release the pressure of the pressure buffer tank 2 . During the pressure relief process, fine particles will be discharged from the pressure buffer tank 2 , and this part of fine particles will be separated under the action of the cyclone separator 27 and collected in the storage bin 28 . After the depressurization of the pressure buffer tank 2 is completed, the first valve 25 and the second valve 26 are closed.

(4) Atmospheric pressure slagging. Open pressure buffer tank double valve 18, open pressure buffer tank cone loose wind device 17. The cooling slag in the pressure buffer tank 2 continuously enters the normal pressure delivery tank 3 under the action of the buffer tank cone loosening wind device 17 . After the cooling slag in the pressure buffer tank 2 is emptied, the double valves 18 of the buffer tank are closed. Carry out steps (2) and (3).

(5) Slag transportation. Open the double valve 21 of the atmospheric tank, and open the cone loosening wind device 20 of the atmospheric tank. The cooling slag in the atmospheric pressure conveying tank 3 enters the conveying injector 4 under the action of the atmospheric tank cone loosening wind device 20, and is discharged from the outlet B to the slag bin under the high-speed gas. After the cooling slag in the atmospheric pressure delivery tank 3 is emptied, close the double valves 21 of the atmospheric pressure tank, and proceed to steps (4) and (5).

It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (5)

1. A high-pressure and high-temperature furnace slag air-water co-cooling slag discharge device, characterized in that it includes a high-pressure desuperheating tank, a pressure buffer tank, a normal-pressure delivery tank and a delivery injector; The high-pressure desuperheating tank includes a high-pressure desuperheating tank body, a loosening wind device in the middle of the high-pressure desuperheating tank, a cooling coil heat exchanger, a loosening wind device for the cone of the high-pressure desuperheating tank and double valves of the high-pressure desuperheating tank. The middle part of the high-pressure desuperheating tank is equipped with a loosening wind device in the middle of the high-pressure desuperheating tank and a cooling coil heat exchanger. The bottom of the tank is connected to the double valve of the high pressure desuperheating tank; The pressure buffer tank includes a buffer tank body, a buffer tank cone loosening wind device and a double valve of the buffer tank. The buffer tank cone loosening wind device is installed on the lower cone part of the buffer tank body. It is connected with the double valve of the buffer tank; The atmospheric transport tank includes an atmospheric tank body, an atmospheric tank cone loosening wind device and an atmospheric tank double valve, and the atmospheric tank cone loosening wind device is installed on the lower cone of the atmospheric tank body. The bottom end of the atmospheric tank is connected to the double valve of the atmospheric tank; The conveying injector includes an air supply pipeline, an injector and an output pipeline, one end of the injector is connected to the air supply pipeline, and the other end is connected to the output pipeline; The high-pressure desuperheating tank is connected to the top of the pressure buffer tank through the double valves of the high-pressure desuperheating tank. Injector connection for injector. 2. A high-pressure, high-temperature furnace slag air-water co-cooled slag discharge device according to claim 1, characterized in that: the slag discharge device also includes a fine slag collection bin, the fine slag collection bin includes a first valve, a second Two valves, a cyclone separator and a storage bin, the cyclone separator is connected to the buffer tank body of the pressure buffer tank through a pipeline, the pipeline is provided with a first valve, and the pipe connected to the external environment of the cyclone separator A second valve is provided on the road, and the bottom of the cyclone separator is connected with the storage bin. 3. A high-pressure high-temperature slag air-water co-cooling slag discharge device according to claim 1, characterized in that: a pressure balance pipe is provided between the high-pressure desuperheating tank and the buffer tank, and the pressure balance pipe is provided with The third valve and the fourth valve are used for pressure balance adjustment. 4. A high-pressure, high-temperature slag slag discharge device according to claim 1, wherein the cooling medium of the cooling coil heat exchanger is liquid or gas. 5. A high-pressure, high-temperature slag slag discharge device according to claim 1, wherein the cooling medium of the cooling coil heat exchanger is water or air.

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