CN217391612U - Desulfurization slurry flash system that high low level was arranged - Google Patents

Abstract

The utility model discloses a desulfurization slurry flash evaporation system arranged in high and low positions, comprising a flash evaporation tank, a communication pipe, a slurry buffer tank and a slurry distribution pipe bundle, wherein the flash evaporation tank is located at a set distance above the slurry buffer tank, Negative pressure is set in the flash tank, and buffer slurry is accommodated in the slurry buffer tank; the communication pipe is arranged vertically, the upper end of the communication pipe is communicated with the bottom of the flash tank, and the communication pipe The lower end extends into the buffer slurry in the slurry buffer tank; one end of the cloth slurry tube bundle horizontally extends into the flash tank, and the bottom of the extended section is provided with a number of slurry nozzles, the cloth slurry tube bundle The other end is used to connect with the desulfurization slurry outlet of the wet desulfurization tower. The utility model can reduce the energy consumption and difficulty of the vacuum pump.

Description

A desulfurization slurry flash evaporation system with high and low positions

technical field

The utility model belongs to the technical field of flue gas wet desulfurization treatment in coal-fired power plants, in particular to a desulfurization slurry flash evaporation system arranged at high and low positions.

Background technique

Flue gas emissions from coal-fired power plants are one of the main sources of domestic air pollutants, and wet desulfurization towers are widely used in domestic coal-fired power plants. The temperature of the flue gas treated by the wet desulfurization device is between 45°C and 55°C. The flue gas contains a large amount of water vapor and is in a saturated state, carrying a large amount of latent heat of vaporization.

Desulfurization slurry flash evaporation heat extraction technology is a new type of flue gas waste heat recovery technology. This technology utilizes the characteristic that the boiling point of the slurry in the wet flue gas desulfurization process will decrease with the decrease of the environmental pressure, and establishes a vacuum phase change environment, so that the desulfurization slurry above the current negative pressure saturation temperature flashes, and the negative pressure steam is carried. The latent heat of vaporization is transported to the absorption heat pump to condense and release heat to the low-temperature medium, so as to realize the clean, efficient and low-cost recovery of the waste heat of the desulfurization slurry. This technology can achieve the multiple purposes of energy saving, water saving, improving desulfurization efficiency, and eliminating visual pollution of smoke plumes, and can take into account energy saving and emission reduction at the same time.

Since the size of the flash tank directly affects the energy consumption of the vacuum pump and the difficulty of vacuuming, the existing desulfurization slurry flashing system structure has a large volume of the flash tank, resulting in high energy consumption of the vacuum pump and difficulty in vacuuming.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a desulfurization slurry flash evaporation system arranged in high and low positions, which can reduce the energy consumption and difficulty of the vacuum pump.

In order to solve the above-mentioned technical problems, the utility model is realized through the following technical solutions:

A desulfurization slurry flash evaporation system arranged in high and low positions, comprising a flash evaporation tank, a communication pipe, a slurry buffer tank and a slurry pipe bundle, the flash evaporation tank is located at a set distance above the slurry buffer tank, and the flash evaporation tank is located at a set distance above the slurry buffer tank. Negative pressure is set inside, buffer slurry is accommodated in the slurry buffer tank; the communication pipe is arranged vertically, the upper end of the communication pipe is communicated with the bottom of the flash tank, and the lower end of the communication pipe extends into the In the buffer slurry in the slurry buffer tank; one end of the cloth slurry tube bundle horizontally extends into the flash tank, and a number of slurry nozzles are opened at the bottom of the extended section, and the other end of the cloth slurry tube bundle is used for The desulfurization slurry outlet of the wet desulfurization tower is connected.

Further, an agitator is provided in the slurry buffer tank.

Further, a number of overflow holes are provided on the side wall of the slurry buffer tank near the top.

Further, a slurry input pipe is provided on the side wall of the slurry buffer tank near the bottom.

Further, a slurry output pump is arranged in the slurry input pipe.

Further, a desulfurization slurry input pump is arranged in the slurry slurry pipe bundle.

Further, a mist eliminator is provided in the flash tank near the top steam outlet.

Further, the plurality of slurry nozzles are evenly distributed at the bottom of the slurry tube bundle extending into the flash tank.

A method for using a desulfurization slurry flash evaporation system arranged in high and low positions, comprising:

The other end of the cloth slurry pipe bundle is connected to the desulfurization slurry outlet of the wet desulfurization tower, and the desulfurized slurry enters the cloth slurry pipe bundle, and is sprayed and broken into small droplets through the slurry nozzle. Under the negative pressure environment, the desulfurization slurry droplets are flashed, and the flashed water vapor is discharged from the flash tank for utilization, and the flashed slurry flows to the slurry buffer tank through the communication pipe.

Further, after the flashed water vapor is demisted by the mist eliminator, it is discharged from the flash tank for utilization.

Compared with the prior art, the present utility model at least has the following beneficial effects:

The utility model provides a desulfurization slurry flash evaporation system arranged at high and low positions. When in use, the other end of the slurry distribution tube bundle is connected to the desulfurization slurry outlet of the wet desulfurization tower, and the desulfurized slurry enters the slurry distribution tube bundle and passes through the slurry nozzle. The spray is broken into small droplets. Under the negative pressure environment in the flash tank, the desulfurization slurry droplets are flashed, and the flashed water vapor is discharged from the flash tank for use. The flashed slurry flows to the Slurry buffer tank. The flash tank and the slurry buffer tank are connected through a communication pipe, and there is a certain amount of slurry in the slurry buffer tank to form a liquid seal to maintain the vacuum of the flash tank. The bottom of the flash tank and the slurry buffer tank are connected through a vertically arranged communication pipe. The flash tank and the slurry buffer tank are arranged in high and low positions. The flashed slurry flows to the slurry buffer tank through the communication pipe, and overcomes the flash tank through the height difference. The vacuum can make the slurry flow into the slurry buffer tank by self-flow, thereby reducing the volume of the flash tank, thereby reducing the energy consumption of the vacuum pump and the difficulty of vacuuming.

In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions in the specific embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the specific embodiments. Obviously, the accompanying drawings in the following description are some of the drawings of the present invention. In the embodiment, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of a desulfurization slurry flash evaporation system arranged in high and low positions of the present invention.

In the figure: 1- flash tank; 2- mist eliminator; 3- slurry pipe bundle; 4- slurry nozzle; 5- desulfurization slurry input pump; 6- slurry buffer tank; 7- slurry output pump; 8- agitator; 9- overflow hole; 10- communication pipe; 11- slurry input pipe.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model. not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As a specific embodiment of the present utility model, as shown in FIG. 1 , a desulfurization slurry flash evaporation system arranged at high and low positions includes a flash evaporation tank 1, a communication pipe 10, a slurry buffer tank 6 and a slurry distribution tube bundle 3. The flash evaporation The tank 1 is located at a set distance above the slurry buffer tank 6, that is, the flash tank 1 is arranged in a high position, and the slurry buffer tank 6 is arranged in a low position. The flash tank 1 is set to a negative pressure environment, and the slurry buffer tank 6 contains buffer slurry. The communication pipe 10 is arranged vertically, the upper end of the communication pipe 10 is communicated with the bottom of the flash tank 1, the lower end of the communication pipe 10 extends into the buffer slurry in the slurry buffer tank 6, and the buffer slurry in the slurry buffer tank 6 is opposite to the communication pipe 10. A liquid seal is formed at the lower end of the , and the vacuum in the flash tank 1 is maintained. A mist eliminator 2 is installed in the flash tank 1 near the top steam outlet.

As shown in Figure 1, one end of the cloth slurry tube bundle 3 extends horizontally into the flash tank 1, and a number of slurry nozzles 4 are provided at the bottom of the extending section. A number of slurry nozzles 4 are evenly distributed in the axial direction of 3 .

As shown in Figure 1, the other end of the slurry distribution tube bundle 3 is used to connect with the desulfurization slurry outlet of the wet desulfurization tower. The desulfurization slurry from the wet desulfurization tower of the coal generating unit enters the flash tank 1 through the slurry distribution tube bundle 3 and the slurry nozzle 4 . Preferably, a desulfurization slurry input pump 5 is arranged in the slurry distribution pipe bundle 3, that is, the desulfurization slurry input pump 5 is used to boost the desulfurization slurry of the wet desulfurization tower of the coal-fired unit and then press it into the flash tank 1.

As a more preferred embodiment, as shown in FIG. 1 , a stirrer 8 is installed in the slurry buffer tank 6 , and the agitator 8 is used to stir the slurry in the slurry buffer tank 6 to prevent the slurry from sedimenting and clogging.

More preferably, a number of overflow holes 9 are provided on the side wall of the slurry buffer tank 6 near the top, and the slurry can overflow through the overflow holes 9 when the amount of slurry is too high.

In this embodiment, the flash tank 1 has a cylindrical structure.

When in use, the other end of the slurry distribution tube bundle 3 is connected to the desulfurization slurry outlet of the wet desulfurization tower. After the desulfurization slurry input pump 5 is used to boost the desulfurization slurry of the wet desulfurization tower of the coal-fired unit, the desulfurization slurry enters the distribution slurry. In the tube bundle 3, it is sprayed and broken into small droplets by the slurry nozzle 4. Since the inner cavity of the flash tank 1 is a negative pressure environment, the desulfurization slurry droplets are flashed, and the flashed water vapor passes through the mist eliminator 2 for demisting. use later.

The flash tank 1 is arranged at a high position, the slurry after flashing flows to the slurry buffer tank 6 through the communication pipe 10, and the slurry buffer tank 6 is arranged at a low position, and the vacuum of the flash tank 1 is overcome by the height difference, so that the slurry flows into the slurry by self-flow. Buffer tank 6.

As shown in FIG. 1 , a slurry input pipe 11 is installed on the side wall of the slurry buffer tank 6 near the bottom, and the slurry in the slurry buffer tank 6 is discharged through the slurry input pipe 11 . Preferably, a slurry output pump 7 is installed in the slurry input pipe 11, and the slurry output pump 7 provides pressure to facilitate discharge.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present utility model, and are used to illustrate the technical solutions of the present utility model, rather than restricting them, and the protection scope of the present utility model is not limited thereto. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art who is familiar with the technical field within the technical scope disclosed by the present utility model can still record the descriptions in the foregoing embodiments. Modifications or changes can be easily imagined in the technical solutions, or equivalent replacements are made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention, All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. The high-low-position arranged desulfurization slurry flash evaporation system is characterized by comprising a flash evaporation tank (1), a communicating pipe (10), a slurry buffer tank (6) and a slurry distribution pipe bundle (3), wherein the flash evaporation tank (1) is positioned above the slurry buffer tank (6) at a set distance, negative pressure is arranged in the flash evaporation tank (1), and buffer slurry is contained in the slurry buffer tank (6); the communicating pipe (10) is vertically arranged, the upper end of the communicating pipe (10) is communicated with the bottom of the flash tank (1), and the lower end of the communicating pipe (10) extends into the buffer slurry in the slurry buffer tank (6); one end level of cloth thick liquid tube bank (3) stretches into in flash tank (1), and stretch into the bottom of section and seted up a plurality of thick liquid nozzles (4), the other end of cloth thick liquid tube bank (3) is used for the desulfurization thick liquid exit linkage with wet flue gas desulfurization tower.

2. A high and low positioned desulfurization slurry flash system according to claim 1, characterized in that said slurry buffer tank (6) is provided with a stirrer (8).

3. The desulfurization slurry flash system arranged at high and low positions according to claim 1, wherein a plurality of overflow holes (9) are formed in the side wall of the slurry buffer tank (6) at positions close to the top.

4. A high-low arranged desulfurization slurry flash system according to claim 1, characterized in that a slurry inlet pipe (11) is arranged on the side wall of the slurry buffer tank (6) near the bottom.

5. A high and low positioned flash evaporation system for desulphurized slurry as claimed in claim 4 wherein, a slurry outlet pump (7) is arranged in said slurry inlet pipe (11).

6. A desulfurization slurry flash system with high and low positions according to claim 1, characterized in that a desulfurization slurry input pump (5) is arranged in the slurry distribution pipe bundle (3).

7. A high-low arranged desulfurization slurry flash system according to claim 1, characterized in that a demister (2) is arranged in the flash tank (1) near the top steam outlet.

8. A high-low arranged desulfurization slurry flash evaporation system according to claim 1, characterized in that the slurry nozzles (4) are uniformly distributed at the bottom of the slurry distribution pipe bundle (3) extending into the flash evaporation tank (1).

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