CN106362538A - Wet flue gas dehumidification and emission reduction device - Google Patents

Abstract

The invention provides a wet flue gas dehumidification and emission reduction device, which is characterized in that it comprises a casing, a wet flue gas inlet and a wet flue gas outlet are arranged on the side of the casing, and a heat exchange tube is arranged inside the casing. The invention has good corrosion resistance and heat transfer performance, and can cool the saturated wet flue gas behind the desulfurization tower and condense the water vapor therein. Dust, gypsum, soluble salt and other pollutants in the flue gas will adhere to the wall of the heat exchange tube during the condensation of water vapor and flow down with the condensed water. The condensed water and pollutants will be collected at the bottom of the device to achieve energy saving and environmental protection , The purpose of water saving.

Description

A wet flue gas dehumidification and emission reduction device

technical field

The invention belongs to the fields of electric power energy saving and environmental protection, and in particular relates to a wet flue gas dehumidification and emission reduction device.

Background technique

At present, my country's environmental pollution is very serious, and the smoke emission of thermal power plants has an inescapable responsibility for environmental pollution. Since the flue gas discharged from the desulfurization absorption tower is saturated wet flue gas, when it passes through the downstream flue and chimney, it will condense to condense water and dissolve various acidic substances, causing low-temperature corrosion to the downstream flue and chimney. In addition, due to the sudden drop in temperature of the wet flue gas at the chimney exit, it will quickly condense a large number of liquid droplets near the chimney exit and settle around the chimney. Since the liquid droplets contain gypsum, the product of wet desulfurization, Commonly known as "gypsum rain", the "gypsum rain" produced by the direct discharge of this wet flue gas through the chimney will cause pollution to the surrounding environment. At present, the commonly used method is to heat the wet flue gas to solve the problem of "gypsum rain", which will consume a lot of heat energy. my country's thermal power plants have a huge responsibility to save energy while protecting the environment. If the saturated wet flue gas can be cooled before being discharged into the atmosphere, and the water vapor in the saturated wet flue gas can be condensed and recovered, the heat of heating the wet flue gas will be greatly reduced, and the effect of energy saving will be achieved; at the same time, the condensed water and condensed water The collection of dust, gypsum, soluble salt and other pollutants can produce huge energy saving and environmental protection benefits.

The saturated wet flue gas discharged from the desulfurization absorption tower is highly corrosive, and ordinary metal materials cannot be used to manufacture such dehumidification and emission reduction devices. Therefore, it is necessary to develop a wet flue gas dehumidification and emission reduction device with strong corrosion resistance and good heat transfer performance.

Contents of the invention

The purpose of the invention is to effectively improve the energy saving and environmental protection level of the power plant, and develop a wet flue gas dehumidification and emission reduction device with strong corrosion resistance and good heat transfer performance.

In order to achieve the above object, the present invention provides a wet flue gas dehumidification and emission reduction device, which is characterized in that it includes a shell, the side of the shell is provided with a wet flue gas inlet and a wet flue gas outlet, and a heat exchange tube is arranged inside the shell .

Preferably, the heat exchange tube is made of titanium or titanium alloy.

More preferably, the housing is made of duplex stainless steel.

Preferably, the upper side of the housing is provided with an upper header box, the lower side of the housing is provided with a lower header box, the top of the heat exchange tube is arranged in the upper header box, and the bottom end of the heat exchange tube is arranged in the upper header box. In the lower head box, the heat exchange tubes are connected to the water inlet header and the water outlet header, and the water inlet header and the water outlet header are arranged in the upper head box, and the water inlet header and the water outlet header are respectively connected to the cooling water inlet pipe and cooling water outlet pipe.

More preferably, the material of the water inlet header, water outlet header, cooling water outlet pipe and cooling water inlet pipe is titanium or titanium alloy.

More preferably, the shell is provided with at least one intermediate water collecting tube plate for collecting condensed water, the heat exchange tube passes through the intermediate water collecting tube plate, the intermediate water collecting tube plate is connected to the layered water collecting pipe, and the layered water collecting pipe is connected to the bottom The condensed water collecting pipe, the bottom condensed water collecting pipe is located at the lower side of the lower head box and connected with the lower head box.

More preferably, the housing includes an upper end plate, a lower end plate and a housing side plate, the upper end of the housing side plate is connected to the upper end plate, the lower end is connected to the lower end plate, a housing support tube is arranged inside the housing, and the housing The body support tube is arranged between the upper end plate and the lower end plate, and the shell support tube is welded with the upper end plate, the middle water collecting tube plate and the lower end plate.

More preferably, the upper header box includes an upper header box top plate and an upper header box side plate arranged on the lower side of the upper header box top plate and connected with the upper header box top plate.

More preferably, the top plate of the upper head box is a titanium stainless steel explosive composite plate, the stainless steel layer of the titanium stainless steel explosive composite plate is welded with the side plate of the upper head box, and the titanium layer is welded with the water inlet header and the water outlet header .

More preferably, the upper header box is provided with a header supporting and fixing plate, and the water inlet header and the water outlet header are arranged on the header supporting and fixing plate and supported by the header supporting and fixing plate.

Preferably, the heat exchange tubes are arranged vertically and staggeredly.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention cools the saturated wet flue gas, condenses and recovers the water vapor therein, and reduces the heating heat used to solve the problem of "gypsum rain" before the saturated wet flue gas of the desulfurization tower of the thermal power plant is discharged into the atmosphere.

2. The present invention can collect the condensed water and the dust, gypsum, soluble salt and other pollutants in the condensed water, and the dust, gypsum, soluble salt and other pollutants in the flue gas will adhere to the heat exchange tube during the water vapor condensation process The condensed water and pollutants are collected at the bottom of the device, so as to achieve the purpose of energy saving, environmental protection and water saving.

3. Compared with ordinary metal heat exchange tubes, titanium and titanium alloy heat exchange tubes used in the present invention have stronger corrosion resistance and longer service life; compared with fluoroplastic heat exchange tubes, they have better heat transfer performance.

4. The present invention adopts a layered water collection structure and utilizes the principle of inertial separation, so that the recovery efficiency of condensed water and pollutants is high.

Description of drawings

Figure 1 is a schematic structural diagram of a wet flue gas dehumidification and emission reduction device.

Fig. 2 is a side view of the wet flue gas dehumidification and emission reduction device;

Figure 3 is a top view of the upper header box;

Fig. 4 is a schematic diagram of the support and fixing plate of the header.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example

As shown in Figure 1, it is a schematic structural diagram of a wet flue gas dehumidification and emission reduction device. The wet flue gas dehumidification and emission reduction device includes a housing, and the side of the housing is provided with a wet flue gas inlet and a wet flue gas outlet. There are heat exchange tubes 9 arranged vertically and staggeredly. The inside of the heat exchange tubes 9 is cooling water, and the outside of the heat exchange tubes 9 is saturated wet flue gas.

The upper side of the housing is provided with an upper header box 6, the lower side of the housing is provided with a lower header box 13, the top of the heat exchange tube 9 is arranged in the upper header box 6, and the bottom of the heat exchange tube 9 The end is arranged in the lower header box 13, and the heat exchange tube 9 is connected to the water inlet header 1 and the water outlet header box 2, as shown in Figure 3, the water inlet header 1 and the water outlet header box 2 are arranged in the upper header box 6 , the water inlet header 1 and the water outlet header 2 are connected to the cooling water inlet pipe 4 and the cooling water outlet pipe 3 respectively.

The shell is provided with at least one intermediate water collecting tube plate 8 for collecting condensed water, the heat exchange tube 9 passes through the intermediate water collecting tube plate 8, and the intermediate water collecting tube plate 8 is connected to the layered water collecting tube 11 arranged on one side of the shell , the layered water collection pipe 11 is connected to the bottom condensed water collection pipe 14 , and the bottom condensed water collection pipe 14 is located at the lower side of the lower header box 13 and connected with the lower header box 13 . The housing includes an upper end plate 7, a lower end plate 12 and a housing side plate 17, the upper end of the housing side plate 17 is connected to the upper end plate 7, the lower end is connected to the lower end plate 12, and the housing is provided with a housing support tube 10. The shell support tube 10 is arranged between the upper end plate 7 and the lower end plate 12, and the shell support tube 10 is welded with the upper end plate 7, the middle water collecting tube plate 8 and the lower end plate 12 to fix the shell part as a whole.

The upper header box 6 includes an upper header box top plate 5 and an upper header box side plate arranged on the lower side of the upper header box top plate 5 and connected with the upper header box top plate 5 . The top plate 5 of the upper head box is a titanium stainless steel explosive composite plate, the stainless steel layer of the titanium stainless steel explosive composite plate is welded with the side plate of the upper head box, and the titanium layer is welded with the water inlet header 1 and the water outlet header 2, It has a good sealing effect and can prevent smoke leakage. The lower end of the side plate of the upper header box is welded to the upper end plate 7 of the shell. As shown in Figure 2, the upper header box 6 is provided with a header supporting and fixing plate 15, and the inlet header 1 and the outlet header 2 are arranged on the header supporting and fixing plate 15 and are supported and fixed by the headers Plate 15 supports. The structure of the header support fixing plate 15 is shown in FIG. 4 , and its upper part is provided with grooves matching the water inlet header 1 and the water outlet header 2 .

The material of the heat exchange tube 9, the water inlet header 1, the water outlet header 2, the cooling water outlet pipe 3 and the cooling water inlet pipe 4 is titanium or titanium alloy, which is stronger in corrosion resistance than ordinary metal materials. Long service life; better heat transfer performance than fluoroplastics. The upper end plate 7 of the shell, the middle water collection tube plate 8, the shell support pipe 10, the lower end plate 12, the lower header box 13, the header support fixing plate 15, the upper header box side plate and the shell The side plate 17 is made of duplex stainless steel, which has good corrosion resistance and long service life.

The wet flue gas dehumidification and emission reduction device of the present invention adopts a modular design, and multiple devices can be used in combination according to actual needs.

When in use, after the saturated wet flue gas from the desulfurization tower of the thermal power plant enters the shell, the water vapor in the saturated wet flue gas will be condensed when it hits the tube wall of the heat exchange tube 9, and the particulate matter in the flue gas will also be condensed with the liquid in the flue gas. Agglomeration occurs to form droplets with particles as the core, the droplets collide with each other, and the particle size gradually increases. The heat exchange tubes 9 are arranged vertically and staggered. Using the principle of inertial separation, the liquid droplets in the flue gas impact on the heat exchange tubes 9 with the airflow, and the direction of the airflow changes sharply. With the help of the inertial force of the particles themselves, they are separated from the The air flow is separated and captured by the tube wall of the heat exchange tube 9. Due to the effect of gravity, the particles on the tube wall will flow into the bottom condensed water collection pipe 14 along the tube wall together with the condensed water.

The cooling water of the wet flue gas dehumidification and emission reduction device of this embodiment enters the heat exchange tube 9 from the cooling water inlet pipe 4, cools the saturated wet flue gas outside the heat exchange tube 9, condenses the water vapor therein, and absorbs the heat , and finally the cooling water after absorbing the heat flows out from the outlet pipe 3.

The wet flue gas dehumidification and emission reduction device of this embodiment adopts a layered water collection structure. The middle water collection tube plate 8 not only serves as a fixed plate, but also has the function of collecting condensed water in layers. The condensed water collected by the middle water collection tube plate 8 flows into the layered The water collecting pipe 11 finally flows into the condensed water collecting pipe 14 at the bottom;

It has been measured that this embodiment can cool the saturated wet flue gas after the desulfurization tower by 5-20°C, and the cooled flue gas can effectively eliminate "gypsum rain" almost without heating; it can effectively recover a large amount of moisture in the saturated wet flue gas , to reduce or even completely supplement the desulfurization operation of the power plant; it can effectively reduce the dust, sulfur trioxide and other pollutants in the flue gas emitted by the power plant. This embodiment has very good effects of energy saving, environmental protection and water saving.

Claims (10)

1. a kind of wet flue gas dehumidifying emission reduction device is it is characterised in that include housing, and the side of housing is provided with wet flue gas import and wet Exhanst gas outlet, is provided with heat exchanger tube (9) in housing.

2. wet flue gas dehumidifying emission reduction device as claimed in claim 1 is it is characterised in that the material of described heat exchanger tube (9) is Titanium or titanium alloy.

3. wet flue gas dehumidifying emission reduction device as claimed in claim 2 is it is characterised in that described housing adopts two phase stainless steel Material.

4. wet flue gas dehumidifying emission reduction device as claimed in claim 1 is it is characterised in that the upside of described housing is provided with top Header tank (6), the downside of housing is provided with bottom head case (13), and the top of heat exchanger tube (9), in top header tank (6), is changed In bottom head case (13), heat exchanger tube (9) connects water inlet header (1) and water outlet header (2), water inlet for the bottom of heat pipe (9) , in top header tank (6), water inlet header (1) and water outlet header (2) connect cooling respectively for header (1) and water outlet header (2) Water inlet pipe (4) and cooling water outlet pipe (3).

5. wet flue gas as claimed in claim 4 dehumidify emission reduction device it is characterised in that described water inlet header (1), water outlet collection The material of case (2), cooling water outlet pipe (3) and cooling water inlet pipe (4) is titanium or titanium alloy.

6. wet flue gas as claimed in claim 4 dehumidify emission reduction device it is characterised in that being provided with least one in described housing For collecting the middle water collecting pipe plate (8) of condensed water, heat exchanger tube (9) passes through middle water collecting pipe plate (8), middle water collecting pipe plate (8) Connect layering collector pipe (11), layering collector pipe (11) connects bottom condensate water and collects water pipe (14), and bottom condensate water collects water Pipe (14) is located on the downside of bottom head case (13) and is connected with bottom head case (13).

7. wet flue gas dehumidifying emission reduction device as claimed in claim 6 is it is characterised in that described housing includes upper end plate (7), lower end plate (12) and housing side plate (17), the upper end of housing side plate (17) connects upper end plate (7), lower end connection bottom End plate (12), is provided with housing support tube (10) in housing, housing support tube (10) is located at upper end plate (7) and lower end plate (12) Between, the same upper end plate of housing support tube (10) (7), middle water collecting pipe plate (8) and lower end plate (12) are welded.

8. wet flue gas as claimed in claim 4 dehumidify emission reduction device it is characterised in that described top header tank (6) includes Top end socket roof box (5) and the top being connected on the downside of top end socket roof box (5) and with top end socket roof box (5) Header tank side plate.

9. wet flue gas as claimed in claim 8 dehumidify emission reduction device it is characterised in that described top end socket roof box (5) For titanium rustless steel explosive clad plate, the stainless steel layer of titanium rustless steel explosive clad plate is welded with top header tank side plate, titanium Layer is welded with water inlet header (1) and water outlet header (2).

10. wet flue gas as claimed in claim 4 dehumidify emission reduction device it is characterised in that setting in described top header tank (6) Header is had to support fixed plate (15), water inlet header (1) and water outlet header (2) on header support fixed plate (15) and by collecting Case supports fixed plate (15) to support.