CN201050511Y - Jet pump applied in wet desulfurization forced oxidation - Google Patents

Abstract

The utility model discloses a jet pump used in wet desulfurization forced oxidation, which comprises a nozzle (5), a throat inlet (2), a throat (3), a diffuser (7), a tail pipe (8) and an air pump. The key of the suction pipe (1) is that a spoiler (6) is fixed on the inner wall of the throat pipe (3), and the spoiler (6) is made into a spiral shape. The design of the utility model is more reasonable, the suction volume is large, the contact area of the gas-liquid two phases is increased, the utilization rate of oxygen is improved, the purpose of high-efficiency oxygenation is achieved, and the energy consumption of operation is reduced.

Description

Jet pump used in wet desulfurization forced oxidation

technical field

The utility model belongs to the technical field of environmental protection desulfurization, in particular to a jet pump used in forced oxidation of wet desulfurization.

Background technique

There are two forms of forced oxidation and natural oxidation in the limestone wet flue gas desulfurization process. In the natural oxidation process, problems such as scaling and blockage often occur, which affect the normal operation of the entire system. Therefore, the current international wet desulfurization process mainly uses forced oxidation. Mainly oxidation.

Most of the forced oxidation systems rely on fans or air compressors as the power source of forced oxidation air to blow air into the limestone slurry; in order to recycle the slurry, a slurry circulation system needs to be added. The forced oxidation system is relatively stable and has wide adaptability, but it has disadvantages such as complex equipment, large structure volume, large land occupation, low oxygen utilization rate, high operating cost, large infrastructure investment, high noise, and difficult maintenance and management. In order to overcome the above shortcomings, limestone slurry jet oxidation process is adopted in some foreign projects. This process uses limestone slurry as the working fluid, entrains air and slurry into the slurry pool through the jet pump, and in the case of sufficient oxygen supply in the slurry pool , The oxidation fan can be stopped, thus reducing the operating cost and saving energy by about 20%.

The jet pump used in the jet flow oxidation process now includes a jet tube, the jet pump has a funnel-shaped upper part, a cylindrical middle part, and a conical lower part. The funnel-shaped side wall on the upper part of the jet pump communicates with the air suction pipe. There are nozzles protruding above the jet pump, which has the following disadvantages: less air intake, uneven mixing of air and limestone slurry, larger bubbles at the outlet of the jet pump, which reduces the contact area of the gas-liquid two-phase, and reduces the utilization rate of oxygen. Increased operating energy consumption.

Utility model content

The technical problem to be solved by the utility model is to provide a jet pump used in forced oxidation of wet desulfurization with large gas-liquid two-phase contact area, sufficient gas volume and high oxygen utilization efficiency.

The technical scheme of the utility model is as follows: the jet pump used in the wet desulfurization forced oxidation includes a nozzle, a throat inlet, a throat, a diffuser, a tailpipe and an air suction pipe, the key lies in: the inner wall of the throat A spoiler is fixed, and the spoiler is made into a helical shape. The pressurized limestone slurry is injected into the throat from the nozzle at high speed. When the high-speed liquid flows through the inlet of the throat, a negative pressure will be generated here, and the air will be entrained in the suction pipe and the air in the hollow pipe. The entrained air and limestone slurry will Thoroughly mix in the throat pipe and spray into the limestone slurry pool through the tail pipe to provide oxidizing air to supplement the limestone slurry. Spoilers are installed in the throat pipe in the middle of the jet tube. When the gas-liquid mixture flows through here, high-speed vortex and mixing of gas and liquid will be generated, and the air will be divided into countless tiny bubbles. These tiny bubbles increase the pressure of the gas-liquid two-phase The contact area is conducive to improving the oxygen utilization rate and achieving the purpose of efficient oxygenation.

The air suction pipe leads a hollow pipe, one end of which is fixed on the outer wall of the air suction pipe, the other end passes through the side wall of the nozzle and enters the nozzle, and its end extends to the nozzle opening of the nozzle. The diameter of the hollow tube is 10-30% of the diameter of the nozzle. A hollow tube is added in the nozzle to send a part of the air from the air suction pipe to the nozzle opening, which can increase the contact area of the gas-liquid two-phase, and at the same time increase the suction area and suction volume of the jet pump. The diameter of the hollow tube is designed as the nozzle 10-30% of the diameter is better to achieve the above effect.

The spoiler is made of steel, and the length is 30-50% of the throat length, and the thickness is designed to be 1mm. This design is more reasonable and the effect is better.

Beneficial effects: the utility model has the advantages of large suction volume, more uniform mixing of air and limestone slurry, and the air bubbles at the outlet of the jet pump are cut into tiny bubbles, which increases the contact area of the gas-liquid two-phase, which is beneficial to improving the oxygen utilization rate and achieving high efficiency. The purpose of oxygenation reduces the operating energy consumption.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

As shown in Figure 1, the jet pump used in the wet desulfurization forced oxidation of the utility model, the nozzle 5, the throat inlet 2, the throat 3, the diffuser 7, the tail pipe 8 and the air suction pipe 1, the inner wall of the throat 3 A spoiler 6 is fixed on it, which can be made into a sheet shape or a spiral shape. A hollow pipe 4 is arranged between the air suction pipe 1 and the nozzle 5, and one end of the hollow pipe 4 is the same as the air suction pipe 1, and the other end passes through the side wall of the nozzle 5 and enters the nozzle 5, and extends along the water flow direction to the Nozzle mouth of nozzle 5. The diameter of the hollow tube 4 is 20% of the diameter of the nozzle. The spoiler 6 is made of steel, and its length is 40% of the length of the throat. The pressurized limestone slurry is injected into the throat from the nozzle at high speed. When the high-speed liquid flows through the inlet of the throat, a negative pressure will be generated here, and the air will be entrained in the suction pipe and the air in the hollow pipe. The entrained air and limestone slurry will In the throat pipe, when the gas and liquid pass through the spoiler 5, a high-speed vortex is generated, mixed, fully mixed, and sprayed into the limestone slurry pool through the tail pipe.

Claims (4)

1. the Jet injector of using in the wet desulphurization forced oxidation, comprise nozzle (5), trunnion inlet (2), trunnion (3), diffusing tube (7), tail pipe (8) and air intake pipe (1), it is characterized in that: be fixed with turbolator (6) on the inwall of described trunnion (3), this turbolator (6) is shape in the shape of a spiral.

2. according to the Jet injector of using in the described wet desulphurization forced oxidation of claim 1, it is characterized in that: between described air intake pipe (1) and nozzle (5), be provided with hollow tubular (4), these hollow tubular (4) one ends are fixed on described air intake pipe (1) outer wall, the sidewall that the other end passes nozzle (5) enters in this nozzle (5), and its termination is extended down to the nozzle of described nozzle (3).

3. according to the Jet injector of using in the described wet desulphurization forced oxidation of claim 2, it is characterized in that: described hollow tubular (4) diameter is 10～30% of an orifice size.

4. according to the Jet injector of using in the described wet desulphurization forced oxidation of claim 1, it is characterized in that: described turbolator (5) is made by steel, and its length is 30～50% of trunnion (3) length.