CN105841138B - A kind of effective film rotating oxygen remover - Google Patents

Abstract

The present invention is a high-efficiency spinning membrane deaerator, which includes a vertical deaerator tower. The spinning membrane device includes a spinning membrane water tank, several spinning membrane pipes and overflow exhaust pipes. The part of the spinning membrane tube located in the spinning membrane water tank is provided with A number of inclined water inlet holes; the buffer device includes a number of distribution layers and a gas-liquid mixing structure, the distribution layer includes a number of upside-down V-shaped flow distribution parts, and the gas-liquid mixing structure includes a gas-liquid mixing network; a steam inlet pipe arranged under the buffer device , the outlet end of the steam inlet pipe is provided with a steam nozzle; the tower body of the vertical deaeration tower includes a heat-insulating outer layer and a steam-conducting inner layer. The baffles are respectively provided with a number of left ventilation holes and right ventilation holes, and the steam return inner layer is located above the rotating membrane device, and a steam return pipe is arranged, and the upper end of the steam return pipe is connected with the steam guide inner layer, and the lower end of the steam return pipe is Connect with the said spin film water tank. The spin film deaerator can make full use of steam to deoxygenate the boiler feed water and improve the deaeration efficiency.

Description

A high-efficiency spin film deaerator

technical field

The invention relates to boiler feed water treatment equipment, in particular to a high-efficiency spin film deaerator capable of deoxidizing wastewater with high oxygen content.

Background technique

In the boiler feed water treatment process, oxygen removal is a very critical link. Oxygen is the main corrosive substance in the water supply system and the boiler. Oxygen in the water supply should be removed quickly, otherwise it will corrode the water supply system and components of the boiler, and the corrosion product iron oxide will enter the pot, deposit or adhere to the boiler tube wall and heat On the surface, iron scale that is insoluble and poor in heat transfer is formed, and corrosion will cause pits on the inner wall of the pipeline, and the resistance coefficient will increase. When the pipeline corrosion is serious, even pipeline explosion accidents may occur. The state stipulates that steam boilers with an evaporation capacity greater than or equal to 2 tons per hour and hot water boilers with a water temperature greater than or equal to 95°C must be deaerated.

Most of the existing deaerators are thermal deoxidizers, that is, when the feed water is heated to the saturation temperature under the corresponding pressure by steam, the partial pressure of the steam will be close to the full pressure on the water surface, and the distribution of various gases dissolved in water The pressure is close to zero, therefore, the water does not have the ability to dissolve the gas, and the gas dissolved in the water is precipitated, thereby removing oxygen and other gases in the water.

Chinese Utility Model Patent Publication No. 2876558 discloses a spin film deaerator, which consists of two parts, a deaerator head and a water tank connected to the bottom of the deaerator head, and an exhaust port is arranged on the top of the deaerator head; The middle part is equipped with a water chamber, water inlet pipe, water outlet pipe, and water sprinkling grate, a packing layer is installed on the top of the supporting plate, a steam pipe is installed at the bottom, and water outlet pipes and water inlet pipes are respectively arranged on the left and right sides of the water chamber. The steam chamber at the bottom of the oxygen removal head is equipped with a steam pipe and a steam nozzle. This device has a certain oxygen removal effect, but it does not make full use of the steam to remove oxygen from the boiler feed water, and the oxygen removal efficiency is not high.

Contents of the invention

The technical problem to be solved in the present invention is to propose a high-efficiency rotary film deaerator, which can fully utilize steam to deoxygenate boiler feed water and improve the deoxygenation efficiency.

The technical problem to be solved by the present invention is achieved through the following technical solutions. The present invention is a high-efficiency spinning film deaerator, which includes a vertical deaeration tower, and the upper part and the lower part of the deaeration tower are respectively provided with a steam exhaust port and a water outlet. Its feature is that it also includes:

The membrane spinning device located below the steam exhaust port includes a membrane spinning water tank with a water inlet pipe on one side and a number of membrane spinning tubes and overflow exhaust pipes passing through the membrane spinning tank vertically. The upper and lower ends of the tube are connected, and the part of the spin film tube located in the spin film water tank is provided with a number of inclined water inlet holes;

A buffer device is provided between the membrane spinning device and the water outlet, and the buffer device includes a number of distribution layers and a gas-liquid mixing structure arranged below the distribution layer, and the distribution layer includes several cross-sections that are inverted The V-shaped flow diversion parts, the flow diversion parts of adjacent distribution layers are arranged at intervals, and the gas-liquid mixing structure includes a gas-liquid mixing network;

A steam inlet pipe arranged below the buffer device, the outlet end of the steam inlet pipe is provided with a steam nozzle;

The tower body of the vertical deaeration tower includes a heat-insulating outer layer and a steam-guiding inner layer, and the steam-guiding inner layer is provided with several steam baffles from top to bottom, and the adjacent steam baffles are respectively provided with several steam baffles. The left vent hole and the right vent hole, the steam-guiding inner layer is located above the said rotating membrane device and is provided with a steam-return pipe, the upper end of the steam-return pipe is connected to the steam-guiding inner layer, the The lower end of the steam return pipe is connected with the said spin film water tank.

In the technical scheme of a high-efficiency spin film deaerator of the present invention, the further preferred technical scheme features are:

The heat insulation outer layer is a hollow heat insulation layer.

In the technical scheme of a high-efficiency spin film deaerator of the present invention, the further preferred technical scheme features are:

A plurality of water vapor grooves are arranged axially on the inner wall of the spin film water tank.

Compared with the prior art, the present invention has the following technical effects:

1. By making the tower body of the vertical deaeration tower include the heat-insulating outer layer and the steam-guiding inner layer, and installing a number of steam baffles on the steam-guiding inner layer from top to bottom, the excess steam can pass through the steam-guiding inner layer slowly. Rising slowly, the vertical deaeration tower is heated during the ascent process, so that the temperature in the deaeration tower is further increased, and the oxygen dissolved in the water is used to precipitate out; then the water vapor in the inner layer of the steam guide is refluxed through the steam return pipe To the spin membrane water tank, the pressure and temperature in the spin membrane water tank can be increased, because the gas dissolved in the water has a lower solubility under higher pressure and higher water temperature, which can further improve the efficiency of oxygen removal;

2. By setting the buffer device, the water flow is stratified on the distribution layer, mixed with water vapor again, and flows into the vapor-liquid mixing structure. The buffer device increases the area of water and water vapor, making the heat exchange more sufficient;

3. By setting several water vapor grooves in the axial direction on the inner wall of the spin membrane water tank, the volume of the spin membrane water tank can be increased, and more water vapor can be introduced, so that the temperature in the spin membrane water tank is higher and the deoxygenation effect is better. .

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of the membrane water tank in Fig. 1;

Fig. 3 is a schematic structural view of part A in Fig. 1;

Fig. 4 is a schematic structural diagram of the steam baffle in Fig. 1 .

detailed description

The specific technical solutions of the present invention will be further described below with reference to the accompanying drawings, so that those skilled in the art can further understand the present invention without constituting a limitation on their rights.

Embodiment 1, with reference to Fig. 1-4, a kind of high-efficiency spin film deaerator, comprises vertical deaerator tower 1, is respectively provided with steam outlet 10 and water outlet 8 in the upper part and the lower part of deaerator tower, also includes: The membrane spinning device 9 arranged below the steam exhaust port 10 includes a membrane spinning water tank 90 with a water inlet pipe 94 on one side and a number of membrane spinning tubes 91 vertically passing through the membrane spinning water tank 90 and overflow steam exhaust. Pipe 93, the upper and lower ends of the overflow exhaust pipe 93 are connected, and the part of the membrane-spinning tube 91 located in the membrane-spinning water tank 90 is provided with some inclined water inlets 92; A buffer device is provided between the nozzles, and the buffer device includes a number of distribution layers 3 and a gas-liquid mixing structure located below the distribution layer 3, and the number of flow layers can be 3 layers, 4 layers, 5 layers or more , the splitting layer 3 includes several splitting parts with inverted V-shaped cross-sections, the splitting parts of adjacent splitting layers 3 are arranged at intervals, the gas-liquid mixing structure includes a gas-liquid mixing network 5, the splitting layer and the gas-liquid mixing structure The support ring 6 is arranged in the exhaust cylinder body 1; the steam inlet pipe 7 is arranged below the buffer device, and the outlet end of the steam inlet pipe 7 is provided with a steam nozzle 71; the vertical deaeration tower The tower body of 1 includes a heat-insulating outer layer 3 and a steam-guiding inner layer 2. The steam-guiding inner layer 2 is provided with a number of steam baffles 20 from top to bottom, and the adjacent upper and lower steam baffles 20 are respectively provided with A number of steam baffles 24 and right air holes 25, the steam guide inner layer 2 is located at the top position of the said spin film device 9 and is provided with a steam return pipe 22, the upper end of the steam return pipe 22 is connected with the guide The steam inner layer 2 is connected, and the lower end of the steam return pipe 22 is connected with the spin film water tank 90 .

Embodiment 2, in the high-efficiency spin-film deaerator described in Embodiment 1: the heat-insulating outer layer 3 is a hollow heat-insulation layer, and the hollow heat-insulation layer can be evacuated to reduce heat loss.

Embodiment 3, in the high-efficiency spinning membrane deaerator described in Embodiments 1 and 2: as shown in FIG. 3 , the inner wall of the spinning membrane water tank 90 is provided with several water vapor grooves 96 along the axial direction.

In the above-mentioned embodiment, the gap between the water inlet pipe 94, the water outlet pipe 8 and the deaeration tower is filled with heat insulating material, which may be glass fiber or asbestos.

The working principle of the present invention: the tower body of the vertical deaeration tower includes a thermal insulation outer layer and a steam guide inner layer, and a number of steam baffles are arranged on the steam guide inner layer from top to bottom, so that the excess steam can pass through the guide The inner layer of steam rises slowly. During the rising process, the vertical deaerator tower is heated to further increase the temperature in the deaerator tower, and the oxygen dissolved in water is used to precipitate out; The water vapor returned to the spin membrane water tank can increase the pressure and temperature in the spin membrane water tank. Because the gas dissolved in water has a lower solubility under higher pressure and higher water temperature, this can further improve the efficiency of oxygen removal. ;

By setting up the buffer device, the water flow is stratified on the split layer, mixed with water vapor again, and flows into the vapor-liquid mixing structure. The buffer device increases the area of water and water vapor to make the heat exchange more sufficient; The inner wall of the water tank is provided with some water vapor grooves along the axial direction, which can increase the volume in the spin membrane water tank, and can introduce more water vapor, so that the temperature in the spin membrane water tank is higher and the deoxygenation effect is better.

Claims (3)

1. A high-efficiency spin film deaerator, comprising a vertical deaerator tower, is respectively provided with a steam outlet and a water outlet at the top and bottom of the deaerator tower, and is characterized in that it also includes: The membrane spinning device located below the steam exhaust port includes a membrane spinning water tank with a water inlet pipe on one side and a number of membrane spinning tubes and overflow exhaust pipes passing through the membrane spinning tank vertically. The upper and lower ends of the tube are connected, and the part of the spin film tube located in the spin film water tank is provided with a number of inclined water inlet holes; A buffer device is provided between the membrane spinning device and the water outlet, the buffer device includes a number of distribution layers and a gas-liquid mixing structure arranged below the distribution layer, and the distribution layer includes several inverted cross-sections. V-shaped flow diversion parts, the flow diversion parts of adjacent distribution layers are arranged at intervals, and the gas-liquid mixing structure includes a gas-liquid mixing network; A steam inlet pipe arranged below the buffer device, the outlet end of the steam inlet pipe is provided with a steam nozzle; The tower body of the vertical deaeration tower includes a heat-insulating outer layer and a steam-guiding inner layer, and the steam-guiding inner layer is provided with several steam baffles from top to bottom, and the adjacent steam baffles are respectively provided with several steam baffles. The left vent hole and the right vent hole, the steam-guiding inner layer is located above the said rotating membrane device and is provided with a steam-return pipe, the upper end of the steam-return pipe is connected to the steam-guiding inner layer, the The lower end of the steam return pipe is connected with the said spin film water tank. 2. The high-efficiency spinning film deaerator according to claim 1, characterized in that: the outer heat-insulating layer is a hollow heat-insulating layer. 3. The high-efficiency spin-film deaerator according to claim 1 or 2, characterized in that: the inner wall of the spin-film water tank is provided with several water vapor grooves along the axial direction.