CN204563780U - Barb demister optimized by a kind of streamlined two passage bands - Google Patents

Abstract

Barb demister optimized by the streamlined two passage bands of one that the utility model discloses the demister scope belonging to wet method fume desulfurizing system.It is made up of multiple demister blade assembly, demister blade assembly is made up of the adjacent demister blade be fixedly connected with by jig between two again, every two demister blades form fluid passage, demister barb is placed in and demister import department, demister barb is made up of straightway and arc, and arc and straightway are tangential on 1/4 circular arc.The utility model structure is simple, be easy to realize, in-site installation is convenient, while guarantee demisting efficiency pressure drop minimum.

Description

A streamlined two-channel demister with optimized barbs

technical field

The utility model belongs to the scope of a demister of a wet flue gas desulfurization system, in particular to a streamlined two-channel demister with optimized barbs.

Background technique

In the wet desulfurization process, the flue gas treated by the absorption tower entrains a large number of slurry droplets, and the higher the flue gas flow rate, the more droplets it carries. If these droplets are not removed, it will not only accelerate the corrosion of the equipment due to the formation of gypsum scale deposited on the surface of the equipment downstream of the absorption tower, but also affect the heat exchange efficiency of the flue gas heater. If the flue gas wet discharge method is used, it will cause pollution of the surrounding environment of the power plant due to "rainfall" (discharge of liquid, solid or slurry) in the chimney. The mist eliminator is the key equipment in the flue gas desulfurization system of coal-fired or oil-fired boilers, and its performance directly affects whether the wet flue gas desulfurization system (WFGD) can operate continuously and reliably. The working principle of WFGD is: when the gas containing mist flows through the demister at a certain speed, due to inertia, the mist collides with the demister blade and adheres to the surface of the demister blade; The diffusion and gravity settlement of the nearby mist make the mist form larger droplets and move upward with the airflow to the corner of the demister blade. The droplets become larger and larger until the accumulated droplets are so large that the gravity generated by themselves exceeds the resultant force of the buoyancy of the smoke and the surface tension of the liquid, and the droplets are separated from the surface of the demister blades. The multi-folding structure of the mist eliminator blades increases the chance of the mist being captured, and the unremoved mist is captured through the same action at the next turning, so that the action is repeated, thereby removing the mist carried in the flue gas. droplet.

Two important indicators to measure the performance of the mist eliminator are the pressure drop at the inlet and outlet of the mist eliminator and the mist removal efficiency. The greater the pressure drop at the inlet and outlet of the demister, the greater the power that the system needs to supplement, and the higher the energy consumption. Generally, the pressure drop of the two-stage demister should be controlled within 120-200Pa. The lower the demisting efficiency, the higher the water content of the flue gas, the greater the amount of droplets deposited on the surface of the equipment downstream of the absorption tower, and the greater the hidden danger to the safe operation of the equipment. Therefore, the moisture content at the outlet end of the flue gas should be controlled within 75mg/Nm ³ in a dry state.

The traditional streamlined two-channel hooked blade has a high critical flow rate and is easy to clean. It is widely used in large-scale desulfurization equipment at present, but most of them have the problems of low demisting efficiency or large pressure drop.

Utility model content

The purpose of this utility model is to aim at the traditional streamlined two-channel hook blades in the prior art with high critical flow velocity and easy cleaning, and are widely used in large-scale desulfurization equipment at present, but most of them have low demisting efficiency or large pressure drop To solve the problem, a streamlined two-channel demister with optimized barbs is provided. It consists of fixedly connected mist eliminator blades, every two mist eliminator blades form a fluid passage, and the barbs of the mist eliminator are placed in the fluid passage.

The vertical height between the barb of the demister placed in the fluid channel and the inlet of the demister is 69.5mm, and the angle between the barb and the vertical direction is 36°; the barb of the demister is composed of a straight line segment and an arc segment Composition, the length of the straight line is 6.5mm, and the arc is a 1/4 arc with a radius of 6.5mm and tangent to the straight line.

The barb is placed in the fluid channel formed by the blades of the mist eliminator, and the barb follows the direction of the flow line in the fluid channel formed by the blades, thus controlling the pressure drop generated by the system.

The utility model has the beneficial effects of simple structure, easy realization, convenient on-site installation, and the lowest pressure drop while ensuring the demisting efficiency; The dual purpose of ensuring the normal operation of the wet flue gas desulfurization system and saving energy.

Description of drawings

Figure 1 is the overall schematic diagram of the FLAT MEV25/40 demister system in the wet desulfurization tower.

Figure 2 is a schematic diagram of a barb-optimized demister blade set.

In Fig. 1, 1. Demister blade assembly; 2. Demister blade support structure; 3. Demister support beam; 4. Flush pipeline; 5. Flush pipeline support system; Fig. 2, 6. Demister 7. Demister barbs.

Detailed ways

The utility model provides a streamlined two-channel demister with optimized barbs. The utility model will be further described below in conjunction with the accompanying drawings.

In Fig. 1, the mist eliminator system consists of the mist eliminator blade assembly 1, the mist eliminator blade support structure 2, the mist eliminator support beam 3, the flushing pipeline 4 and the flushing pipeline support system 5, and its basic structure is the same as that of the FLAT MEV25 /40 type mist eliminator, the mist eliminator blade assembly 1 is made up of a plurality of mist eliminator blades 6 spliced in pairs by clamps, and every two mist eliminator blades 6 form a fluid channel (as shown in Figure 2) . The demister blade 6 is composed of a streamlined blade and a demister barb 7. The demister barb 7 is placed at a vertical height of 69.5 mm from the inlet of the demister, and the angle between the barb and the vertical direction is 36°. The demister barb 7 is composed of a straight line segment and an arc line segment, the length of the straight line segment is 6.5 mm, and the arc line segment is a 1/4 circular arc with a radius of 6.5 mm and tangent to the straight line segment.

Numerical simulation tests can be used to verify that the improved and optimized demister blade 6 has a good trapping effect on droplets. Since the barbs follow the streamlines in the vane fluid passages, the pressure drop generated by the system is controlled when the airflow with liquid droplets passes through the demister fluid passages. The barb is placed in the fluid channel formed by the demister blade 6, which narrows the fluid channel and increases the probability of the droplet colliding with the demister blade 6, thereby increasing the probability of the droplet being trapped and improving The effect of defogging efficiency.

Claims (3)

1. barb demister optimized by streamlined two passage bands, it is characterized in that, barb demister is made up of multiple demister blade assembly, demister blade assembly is made up of the adjacent demister blade be fixedly connected with by jig between two again, every two demister blades form fluid passage, and the barb of demister is placed in fluid passage.

2. barb demisters optimized by a kind of streamlined two passage bands according to claim 1, it is characterized in that, described in be placed in demister barb in fluid passage and demister import vertical height is 69.5mm place, the angle of barb and vertical direction is 36 °; Demister barb is made up of straightway and arc, its straight line segment length 6.5mm, and arc is that radius is 6.5mm and 1/4 circular arc tangent with straightway.

3. barb demister optimized by a kind of streamlined two passage bands according to claim 1, it is characterized in that, described barb is placed in the fluid passage that demister blade is formed, and the grain direction in the fluid passage of blade formation complied with by barb, thus controls the pressure drop that system produces.