CN204543973U - A kind of wet magnesium oxide desulphurization system - Google Patents

Abstract

The utility model relates to a denitration system, in particular to a magnesium oxide wet desulfurization system. It includes a smoke inlet component, an absorption tower desulfurization component and a magnesium oxide delivery component, and the smoke inlet component and the magnesium oxide delivery component are respectively connected with the absorption tower desulfurization component. A magnesium oxide wet desulfurization system has compact structure, reasonable equipment layout, high operating efficiency and strong adaptability.

Description

A magnesium oxide wet desulfurization system

technical field

The utility model relates to a denitration system, in particular to a magnesium oxide wet desulfurization system.

Background technique

At present, the combustion of traditional boilers mainly uses coal. Among them, coal-fired power plants are the largest emitters of coal consumption and sulfur dioxide and nitrogen oxides in my country, causing environmental pollution and high production costs.

Chinese patent CN201020653537.5 discloses a special square desulfurization and dust collector for chain type boilers. A second impact desulfurization and dust removal chamber is arranged in parallel on the side of the first impact desulfurization and dust removal chamber with a flue gas inlet, and is arranged in parallel with the second impact desulfurization and dust removal chamber. The desulfurization and dedusting chambers are side-by-side steam-water separation chambers, the top of the second impact desulfurization and dust-removal chamber is closed and the bottom two sides are respectively connected with the first desulfurization and dust-removal chamber and the steam-water separation chamber. The uppermost part of the steam-water separation chamber is the flue gas outlet; the downward spraying atomizing nozzle is arranged on the upper part of the first impact desulfurization and dust removal chamber. This structure has poor desulfurization effect.

Contents of the invention

The utility model mainly solves the deficiencies in the prior art, has a compact structure, excellent running performance, and uses a magnesium oxide wet desulfurization system with high safety performance.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions:

A magnesia wet desulfurization system, comprising a smoke inlet assembly, an absorption tower desulfurization assembly, and a magnesium oxide delivery assembly, wherein the smoke inlet assembly and the magnesium oxide delivery assembly are respectively connected to the absorption tower desulfurization assembly;

The smoke inlet assembly includes a smoke inlet pipe, and an inlet baffle door is arranged in the smoke inlet pipe;

The desulfurization assembly of the absorption tower includes an absorption tower, an air communication pipe and a process water pipeline, the upper end of the absorption tower is provided with a process water spray pipeline, and the bottom of the process water spray pipeline is provided with a magnesium oxide spray pipe. Shower pipe, the lower end of the absorption tower is provided with magnesium oxide solution, the air connecting pipe extends into the magnesium oxide solution, the magnesium oxide solution and the magnesium oxide spray pipeline are connected through a circulating pump, the The process water spray pipeline is connected with the process water pipeline, the upper end of the absorption tower is connected with the chimney through the communication pipe, and the absorption tower is connected with the smoke inlet pipeline;

The magnesium oxide conveying assembly includes a magnesium oxide powder bin and a magnesium oxide slurry tank, the bottom of the magnesium oxide powder bin communicates with a weighing screw feeder, and the weighing screw feeder is connected to the magnesium oxide slurry tank. The tanks are connected, and the magnesium oxide slurry tank is connected with the absorption tower through a magnesium oxide slurry pump.

As a preference, the magnesium oxide powder bin, the process water spray pipeline and the magnesium oxide spray pipeline are respectively connected with the compressed air pipeline.

As a preference, the bottom of the absorption tower is provided with a slurry discharge pipe connected with the magnesium oxide solution, and the slurry discharge pipe flows into the sedimentation tank.

Magnesium oxide powder is put into the preparation tank, and process hot water (water temperature is 80~90°C) must be added. After vigorous stirring, the slurry is transported to the desulfurization tower by a slurry pump. Magnesium hydroxide slurry can automatically adjust the concentration and amount according to the change of _SO2 , the desulfurization index and PH value.

After the flue gas is dedusted by the bag filter, the flue gas is connected to the absorption tower through the damper of the inlet flue, and the clean cold flue gas after desulfurization leaves the absorption tower and is directly discharged through the chimney.

The collection tower is a reaction vessel consisting of three parts, the middle part is the spray absorption part, the bottom part is the reaction pool, and the upper part is the demister part. The flue gas enters the absorption tower at the bottom of the absorption tower, then turns upward, enters the spraying section, and is cooled by the sprayed slurry, a part of the water in the slurry is evaporated, and the flue gas is cooled at the same time, SO ₂ in the flue gas is absorbed by the slurry, and the solution falls into the reaction pool. The oxidation blower blows the humidified air into the reaction pool after mixing with the agitator. Oxidation reactions take place inside the pool. The agitator stirs and mixes, the solid matter in the slurry is in a suspended state, and the slurry is circulated to the spray layer of the absorption tower through the circulating pump. After the flue gas is desulfurized in the spray section, it flows upward through the two-stage demister, and most of the water droplets in the flue gas are removed in the demister. After cooling, the purified and dehydrated flue gas leaves the absorption tower at the top of the absorption tower. The process water intermittently and controlledly washes the demister blades to remove the attached solids. Mist eliminator rinse water is also used to maintain the required volume of water in the reaction tank.

Distributes process water to desulfurization systems, equipment and utilities at specified pressures. Process water is used for: 1. Flushing water for pipelines, pumps, etc.; 2. Preparation of magnesium hydroxide slurry; 3. Flushing demister; 4. Maintaining the liquid level of the absorption tower reaction pool.

Water supply to other public facilities: Water consumption during the flue gas desulfurization process: 1 evaporated in the flue gas; 2 discharged into the wastewater system.

The air is blown into the absorption tower through the oxidation fan, and the slurry in the reaction zone of the absorption tower is forced to oxidize, and the magnesium sulfite is oxidized to magnesium sulfate, which increases its solubility and reduces the COD of the discharged slurry.

The solution pH value of the magnesium method is controlled between 6 and 6.5. Compared with the limestone-gypsum method, the biggest advantage of the magnesium method is that the system will not cause equipment fouling and blockage, and the equipment corrosion problem is also lower than that of the limestone-gypsum method. The land area is small, the operating cost is low, the investment amount is reduced, and the comprehensive economic benefits are greatly improved. Generally speaking, the safety performance of magnesium desulfurization in actual engineering is very good.

Since the reaction products of magnesium desulfurization are magnesium sulfite and magnesium sulfate, they can be discarded or purified to produce t magnesium sulfate for sale.

Therefore, the magnesium oxide wet desulfurization system provided by the utility model has compact structure, reasonable equipment layout, high operation efficiency and strong adaptability.

Description of drawings

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

Detailed ways

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: As shown in Fig. 1, a kind of magnesia wet desulfurization system comprises a smoke inlet assembly, an absorption tower desulfurization assembly and a magnesium oxide conveying assembly, and the described smoke inlet assembly and magnesium oxide conveying assembly are respectively connected with the absorption tower desulfurization assembly Connected;

The smoke inlet assembly includes a smoke inlet pipe 1, and an inlet baffle door 2 is arranged in the smoke inlet pipe 1;

The desulfurization assembly of the absorption tower includes an absorption tower 3, an air connecting pipe 4 and a process water pipeline 5, the upper end of the absorption tower 3 is provided with a process water spray pipeline 6, and the process water spray pipeline 6 is Below is provided with magnesium oxide spray pipeline 7, and the lower end in the described absorption tower 3 is provided with magnesium oxide solution 8, and described air communication pipe 4 stretches in the magnesium oxide solution 8, and described magnesium oxide solution 8 and Magnesium oxide spray pipeline 7 is communicated by circulation pump 9, and described process water spray pipeline 6 is communicated with process water pipeline 5, and described absorption tower 3 upper end is communicated with chimney 19 by communication pipeline 10, and described The absorption tower 3 communicates with the smoke inlet pipe 1;

The magnesia conveying assembly includes a magnesia powder bin 11 and a magnesia slurry tank 12, the bottom of the magnesia powder bin 11 communicates with a weighing screw feeder 13, and the weighing screw feeder 13 communicates with the magnesia slurry tank 12, and the magnesia slurry tank 12 communicates with the absorption tower 3 through the magnesia slurry pump 15.

The magnesium oxide powder bin 11 , the process water spray pipeline 6 , and the magnesium oxide spray pipeline 7 communicate with the compressed air pipeline 16 respectively.

The bottom end of the absorption tower 3 is provided with a slurry discharge pipe 17 communicating with the magnesium oxide solution 8 , and the slurry discharge pipe 17 flows into a sedimentation tank 18 .

Claims (3)

1. A magnesium oxide wet desulfurization system, characterized in that: it comprises a smoke inlet assembly, an absorption tower desulfurization assembly and a magnesium oxide delivery assembly, and the smoke inlet assembly and the magnesium oxide delivery assembly are respectively connected with the absorption tower desulfurization assembly; The smoke inlet assembly includes a smoke inlet pipe (1), and an inlet baffle door (2) is arranged in the smoke inlet pipe (1); The desulfurization assembly of the absorption tower includes an absorption tower (3), an air connecting pipe (4) and a process water pipeline (5), and the upper end of the absorption tower (3) is provided with a process water spray pipeline (6), The below of described process water spray pipeline (6) is provided with magnesia spray pipeline (7), and the lower end in described absorption tower (3) is provided with magnesia solution (8), and described air connecting pipe (4) stretch in the magnesium oxide solution (8), described magnesium oxide solution (8) is connected with magnesium oxide spray pipeline (7) by circulation pump (9), described process water spray pipeline ( 6) communicate with the process water pipeline (5), the upper end of the absorption tower (3) is communicated with the chimney (19) through the communication pipeline (10), and the absorption tower (3) is connected with the smoke inlet pipeline (1) Connected; Described magnesia conveying assembly comprises magnesia powder bin (11) and magnesia slurry tank (12), and the bottom of described magnesia powder bin (11) is connected with weighing screw feeder (13), and the The weighing screw feeder (13) is communicated with the magnesium oxide slurry tank (12), and the magnesium oxide slurry tank (12) is communicated with the absorption tower (3) through the magnesium oxide slurry pump (15). 2. A magnesia wet desulfurization system according to claim 1, characterized in that: the magnesia powder bin (11), process water spray pipeline (6), magnesia spray pipeline (7) They are connected with compressed air pipelines (16) respectively. 3. A kind of magnesia wet desulfurization system according to claim 1 or 2, characterized in that: the bottom end of the absorption tower (3) is provided with a slurry discharge pipe connected with the magnesia solution (8) (17), the described slurry discharge pipe (17) flows into the settling tank (18).