CN210905589U

CN210905589U - Flue gas water catching device and cooling and droplet removing device used therein

Info

Publication number: CN210905589U
Application number: CN201921361585.4U
Authority: CN
Inventors: 袁宗海; 李建; 肖海平; 高丹
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-07-03
Anticipated expiration: 2029-08-21

Abstract

The utility model belongs to the technical field of the water is caught to the flue gas, especially, relate to a water device is caught to flue gas and wherein the cooling that uses removes little liquid droplet device. The utility model provides a device that droplet was removed in cooling that flue gas was used in catching water, it includes cooling device, injection pipe, and the injection pipe is including spraying the trunk line, and cooling device is used for the water-cooling, and cooling device is linked together through pipeline and injection trunk line, sets up a plurality of minutes pipes on the trunk line, and two fluid atomizer of high pressure are arranged on being in charge. The utility model discloses a device defogging is efficient, avoid blockking up, effectively improve the device that the droplet was removed in the cooling of ceramic membrane subassembly efficiency.

Description

Flue gas water catching device and cooling and droplet removing device used therein

Technical Field

The utility model belongs to the technical field of the water is caught to the flue gas, especially, relate to a device that drop liquid was removed in cooling that the aquatic was used is caught to flue gas.

Background

SO2 has been regarded as one of the main pollutants of thermal power plants for a long time, and thermal power units are equipped with respective desulfurization systems, wherein, the limestone-gypsum wet flue gas desulfurization system has the characteristics of simple structure, high efficiency and the like, and is widely applied to the thermal power units. In the limestone-gypsum wet flue gas desulfurization system, flue gas is fully contacted with gypsum slurry, SO that the gypsum slurry absorbs SO2 in the flue gas, the gypsum slurry is formed through processes of oxidation, crystallization and the like, and gypsum is obtained through dehydration. Therefore, the water vapor in the flue gas at the outlet of the desulfurization system is in a saturated state, and the flue gas contains a large amount of solid particles with the particle size of less than 15 μm, such as CaSO4, MgSO4 and the like, and the fine particles are not easy to remove because of the small particle size, and are discharged into the atmosphere, thus increasing the dust pollution in the environment. A large amount of water vapor is discharged along with the flue gas, so that waste of water resources of a power plant is caused, and white smoke, gypsum rain and other phenomena are generated at the same time.

Aiming at saturated steam in the flue gas at the outlet of the desulfurization system, a plurality of methods are adopted to capture the moisture, and then the moisture is reused in a thermal power generating unit, so that the overall water consumption of a power plant is reduced. The ceramic membrane separation technology has high water capture efficiency, captured water quality is high in purity, and the ceramic membrane separation technology is the best water capture technology with the best application prospect.

At present, thermal power generating unit all arranges corresponding defroster at the desulfurization system export, and the defroster mainly divides two kinds of forms: one is a tubular demister, which is formed by adding a speed increaser, a separator, a collecting ring, a flow guide ring and other parts to a plurality of parallel round tubes, and accelerating the flue gas to improve the contact probability among particles, so that small fog drops are polymerized and then removed; the other type is a plate type demister, the common plate type is provided with a broken line plate and an arc plate with a barb, the flow direction is changed after flue gas enters the demister, liquid drops impact on a facing wall under the action of centrifugal force, the liquid drops are captured through 3 mechanisms of inertial collision and direct interception and diffusion, and a liquid film gathered on the wall surface forms a thick water curtain and then flows down along the wall, so that the removal purpose is achieved.

The disadvantages of the demister arranged generally horizontally in the desulfurization system are as follows: 1. in the prior art, the removal efficiency of the small fog drops with the grain size of less than 15 mu m is low, when the grain size is too small, the centrifugal force action and the collision probability are relatively small, and the capture probability is also reduced. 2. A large amount of fog drops are gathered in the demister, so that the blockage of the demister is easily caused, and the demisting efficiency is greatly reduced. 3. The defroster has a lot of narrow passageways, bend etc. and it is clean that the washing in-process can't get rid of, can influence subsequent defogging efficiency etc..

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

The utility model aims at providing a defogging is efficient, avoid blockking up, effectively improve the device that the droplet was removed in cooling of ceramic membrane subassembly efficiency.

Means for solving the technical problem

In order to the problem, the utility model provides a device that little liquid was removed in cooling that used in flue gas water catch, it includes cooling device, injection pipe, and the injection pipe is including spraying the trunk line, and cooling device is used for the water-cooling, and cooling device is linked together through pipeline and injection trunk line, sets up a plurality of minutes pipes on the trunk line, and two fluid atomization nozzle of high pressure arrange on being in charge.

Wherein, 4 ~ 6 atomizer are arranged to every minute pipe, and the distance value Y between the atomizer is 1 ~ 1.2 m.

And the nozzles at two ends of the branch pipe form alpha of 10-15 degrees with the vertical direction and spray downwards, and the nozzle at the middle part sprays downwards vertically.

The utility model also provides a water installation is caught to flue gas, its cooling that includes above removes the device of droplet, and the ceramic membrane subassembly, ceramic membrane subassembly and atomizer are arranged in the flue, and the atomizer is arranged in the flue before the ceramic membrane subassembly is flowed through to the flue gas.

The beneficial effects of the utility model

1. Improve defogging efficiency, make the original particle size in the flue gas be less than 15 mu m fog drop, grow up into the great fog drop of particle size under the equipment effect of the utility model of this patent, then get rid of large particle size fog drop with the help of the effect of ceramic membrane subassembly.

2. Avoid the jam quadrant of defroster, through this patent effect, increase droplet is by the probability that the ceramic membrane subassembly was caught, can in time wash at the droplet that the ceramic membrane subassembly was caught, can not cause the jam problem.

3. In the aspect of cleaning, the ceramic membrane captures fog drops, the ceramic membrane has no structures such as narrow channels and bent channels, the washing device is convenient to arrange, and can be used for timely and effectively cleaning without influencing the subsequent capturing efficiency.

4. The efficiency of the ceramic membrane module is improved, under the action of the ceramic membrane module, a large amount of moisture is carried outside in the growth process of the particles and is captured in the ceramic membrane module, and the water capturing efficiency of the ceramic membrane module is improved; moreover, under the effect of this patent, the condensation of vapor and acid gas also can strengthen, and a large amount of vapor condenses into the droplet, can improve the water capture efficiency of ceramic membrane subassembly equally, reduces the emission of acid gas in the flue gas simultaneously.

Further features of the present invention will become apparent from the following description of exemplary embodiments.

Drawings

Fig. 1 is a process flow diagram of the present invention.

Fig. 2 shows the arrangement of the nozzles of the small liquid drop removing device of the present invention.

Detailed Description

One embodiment of the present disclosure will be specifically described below, but the present disclosure is not limited thereto.

The technological process of the patent refers to fig. 1 as follows: introducing a stream of fresh water after the processing through the water pump, fully cooling through cooling device, cooling the water intake to below 10 ℃, then spout the water intake into the flue through two fluid atomizer of high pressure, the position of spouting is 3 meters before the ceramic membrane subassembly, and the water intake flow is decided according to unit load condition and desulfurizing tower operational aspect, generally to the 60MW unit of 80% load operation, and water spray flow control is at 3 ~ 3.5 t/h.

The basic principle is as follows: the temperature of flue gas at the outlet of the desulfurization system is about 50 ℃, water vapor is in a saturated state, the temperature of the flue gas is reduced by 3-6 ℃ by spraying low-temperature process water, and meanwhile, the supersaturation degree of the water vapor in the flue gas is further improved by the sprayed water vapor. The particles of CaSO4, MgSO4 and the like have strong hydrophilicity, can easily adsorb water vapor in the process of contacting with water vapor, a large amount of water vapor is adsorbed on the surface of the particles to form a water film, the water film is condensed and forms larger aggregates under the action of thermophoresis, turbulence, fluid drag force and the like, the particle size of the particles is continuously increased, and some particles continuously absorb the water vapor on the surface of the water film to form small droplets with larger particle size. This patent is through spraying of low temperature process water, reduce the flue gas temperature, improve the supersaturation degree of vapor in the flue gas, particulate matters such as CaSO4, MgSO4 that have promoted the particle diameter and are less than 15 μm grow up, then when passing through the ceramic membrane subassembly, along the ceramic membrane subassembly by-pass flow, under the inertial force effect, the great particulate matter of particle diameter has higher probability and contacts with the ceramic membrane subassembly, and then by the catch, to getting rid of the droplet that the particle diameter is less than 15 μm, obvious effect has. The captured particles are adhered to the ceramic membrane module and can be easily removed through the ceramic membrane washing device, the wall of the ceramic membrane is smooth, the washing is simple, and the washing efficiency is high.

The low-temperature process water spraying device reduces the temperature of flue gas, improves the supersaturation degree of the flue gas, strengthens the condensation effect on water vapor and acid gases such as H2SO4 and HCl, forms small liquid drops through the phase change process, continuously grows under the action of the supersaturation state, continuously enlarges the particle size of the small liquid drops, improves the capture probability when passing through a ceramic membrane assembly, greatly improves the water capture efficiency of the ceramic membrane assembly, simultaneously can remove the acid gases in the flue gas in a synergic manner, reduces the environmental pollution and the like.

High-pressure two fluid atomizing shower nozzle arranges and refers to fig. 2, and low temperature process water introduces and sprays the trunk line, sets up a plurality of minutes on the trunk line, and it is decided according to the water spray volume, generally takes 3 ~ 5 minutes, has the same distance interval X between every minute pipe 1 ~ 1.2m, and each minute pipe arranges along flue width direction. The atomizing nozzles are arranged on the branch pipes, 4-6 atomizing nozzles are arranged on each branch pipe, the distance value Y between the atomizing nozzles is 1-1.2 m, the nozzles at two ends of each branch pipe form alpha of 10-15 degrees with the vertical direction to spray downwards, the nozzles at the middle part spray downwards vertically, and the small atomizing liquid drops of the flue are guaranteed to be uniformly arranged in the whole flue. Liquid gets into the shower nozzle from the branch pipe, compressed air sends into from the shower nozzle side, adopt outer two fluid atomizer of high pressure of hybrid, liquid pressure P1 is 1 ~ 1.2MP, gas pressure P2 is 4 ~ 5MP, the atomized liquid drop contained angle that the shower nozzle jetted out will carry out the strict control, according to flue gas flow, flue gas velocity of flow and desulfurization system export flue gas particular case and decide, the desirable scope is between 30 ~ 45, the angle value will guarantee that atomized jet rigidity can not be on the large side, avoid the in-process direct contact who sprays downwards to the flue bottom. The high-pressure two-fluid atomization nozzle has a strong atomization effect, the atomization particle size is less than 10 microns, and the high-pressure two-fluid atomization nozzle has a good growth promotion effect on particles with the particle size of less than 15 microns.

Industrial applicability

The utility model discloses can promote the particle diameter to be less than 15 μm's little fog drop and grow up through low temperature technology sprinkler water, then detach little fog drop with the help of the ceramic membrane subassembly, improve the particulate matter efficiency of getting rid of the particle diameter is less than 15 μm. The fog drops are captured by means of the ceramic membrane component, the problems that a traditional demister is blocked and difficult to clean and the like are solved, and the ceramic membrane component is smooth in surface, free of narrow channels, bends and the like, and high in cleaning efficiency. The method has the advantages of reducing the temperature of the flue gas, improving the supersaturation degree, increasing the condensation effect of water vapor and acid gas, carrying out phase change condensation to form small droplets with larger particle size, capturing on a ceramic membrane component, improving the water capturing efficiency of a ceramic membrane, and reducing the emission of the acid gas in the flue gas. Meanwhile, in the process of promoting the growth of the particles, small droplets are formed on the outer surfaces of the particles and are captured on the ceramic membrane component together with the particles, so that the water capturing efficiency of the ceramic membrane component is improved.

The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a cooling that flue gas was caught in aquatic and is removed little liquid device, its characterized in that includes cooling device, injection pipe, and the injection pipe is including spraying the trunk line, and cooling device is used for cooling the water, and cooling device is linked together through pipeline and injection trunk line, sets up a plurality of minutes pipes on the trunk line, and two fluid atomizer of high pressure arrange on being in charge.

2. The device of claim 1, wherein 4-6 atomizing nozzles are arranged in each branch pipe, and the distance between the atomizing nozzles is 1-1.2 m.

3. The device of claim 1, wherein the nozzles at the two ends of the branch pipe spray downward at an angle of α -10 to 15 ° to the vertical direction, and the nozzles at the middle portion spray downward vertically.

4. A flue gas water trap comprising the device for reducing temperature and removing small liquid drops as claimed in any one of claims 1 to 3, a ceramic membrane module, the ceramic membrane module and an atomizer arranged in the flue, the atomizer being arranged in the flue before the flue gas passes through the ceramic membrane module.