CN205164314U - It eliminates and collecting system to be applicable to wet flue gas desulfurization gypsum rain or chimney rain - Google Patents

Abstract

The utility model relates to a system for eliminating and collecting gypsum rain or chimney rain suitable for wet desulfurization. Including the outlet flue 2 of the absorption tower, the flue water delivery system 3, the inlet flue 5 of the demist tower, and the demist tower 6 connected in sequence, and the inlet flue 5 of the demist tower is connected to the demist tower 6 through an expansion joint 4, A top chimney 7 is arranged on the top of the demisting tower 6, and the front end of the outlet flue 2 of the absorption tower is connected to an expansion joint 4, and the flue water delivery system 3 includes a flue water delivery tank, a water delivery pipeline and a water collection tank. This system can effectively eliminate and capture wet desulfurization gypsum rain or chimney rain, meet the requirements of environmental protection and industrial hygiene, and has simple structure, safe and reliable operation, low investment, low operation and maintenance costs, and the resistance loss from the outlet of the absorption tower to the outlet of the chimney is about 200~350? Pa, the head loss is small.

Description

A gypsum rain or chimney rain elimination and collection system suitable for wet desulfurization

technical field

The utility model belongs to the technical field of desulfurization and environmental protection, in particular to a system for eliminating and collecting gypsum rain or chimney rain suitable for wet desulfurization.

Background technique

The wet desulfurization technology is the most widely used in thermal power plant boiler and sintering flue gas desulfurization technology. After wet desulfurization, the saturated wet flue gas with a flue gas temperature of about 50°C will form gypsum rain or chimney rain if it is discharged directly without treatment. , its harm to the environment mainly includes: 1) Corrosion to structures and the surrounding environment; 2) It will cause a certain degree of environmental pollution; 3) It will affect the safe operation of surrounding workers; 4) It will affect the senses and affect the quality of the surrounding environment. .

In the early days, the flue gas heat exchanger (GGH) was one of the main devices in the wet desulfurization system. It used the raw flue gas to heat the desulfurized clean flue gas, and raised the temperature of the desulfurized flue gas from 50°C to about 80°C. , the temperature is above the flue gas dew point temperature, effectively reducing the phenomenon of gypsum rain or chimney rain after wet desulfurization, but GGH has the following disadvantages: 1) a large investment, the cost is about 15% of the desulfurization system; 2) its other The resistance loss is large, about 1200Pa, and the operating cost is high; 3) The net flue gas is corrosive, causing GGH to leak easily, high maintenance costs, and affecting desulfurization efficiency; 4) Easy to block, high operating costs, and difficult to maintain; 5 ) The operation of GGH is complex and unstable, resulting in the unsustainable, safe and efficient operation of the wet desulfurization system. Therefore, most wet desulfurization systems have canceled the setting of GGH.

In order to eliminate gypsum rain or chimney rain, in addition to setting up GGH, the mainstream technologies include setting up wet electric demister technology, flue gas electric heat tracing technology, flue gas steam heating technology, and modification of the original chimney. It generally has the problems of high investment or operating costs and difficult operation and maintenance. The transformation of the original chimney will also face problems such as long construction period and shutdown.

Contents of the invention

The purpose of this utility model is to overcome the above disadvantages and provide a safe and reliable operation, low investment, small resistance loss, low operation and maintenance costs, suitable for wet desulfurization gypsum rain or chimney rain elimination and collection system.

The technical solution of the utility model is: an elimination and collection system suitable for wet desulfurization gypsum rain or chimney rain, including the outlet flue of the absorption tower connected in sequence, the flue water delivery system, the inlet flue of the demisting tower, the Fog tower, the inlet flue of the demist tower is connected to the demist tower through an expansion joint, a chimney is set on the top of the demist tower, the front end of the outlet flue of the absorption tower is connected to an expansion joint, and the flue water delivery system includes Flue water tank, water pipeline and water collection tank.

Further, the outlet flue of the absorption tower is a rectangular flue, and the outlet flue of the absorption tower is connected with the absorption tower through an expansion joint.

Further, the flue at the outlet of the absorption tower is connected to the water delivery tank, and a slope is designed to face the water delivery tank with a slope of 2 to 5 degrees.

Further, the entrance flue of the demist tower is a rectangular flue, and the entrance is tangent to the demist tower, so that the flue gas enters the demist tower along a tangential direction.

Further, the inlet flue of the demisting tower and the water delivery tank are connected by an expansion joint.

The flue gas velocity at the outlet flue of the absorption tower and the flue at the entrance of the demisting tower is 15-18m/s.

The demisting tower and the emergency slurry tank are combined into one design to store the desulfurization slurry and collect the liquid in the flue gas.

The air velocity of the defogging tower is 1.8-2.2m/s, and the gas residence time is greater than 4s.

The chimney at the top of the tower is installed on the demisting tower, rigidly connected, and the flue gas flow rate is 15-18m/s. According to the specific conditions of the project, the design height of the chimney at the top of the tower can reach up to about 90m.

The beneficial effects of the utility model are: the system can effectively eliminate and capture wet desulfurization gypsum rain or chimney rain, meet the requirements of environmental protection and industrial hygiene, and has simple structure, safe and reliable operation, less investment, low operation and maintenance costs, absorbs The resistance loss from the tower outlet to the chimney outlet is about 200~350Pa, and the pressure head loss is small.

Description of drawings

Figure 1 is a front view of a gypsum rain or chimney rain elimination and collection system suitable for wet desulfurization.

FIG. 2 is a top view of FIG. 1 .

Figure 3 is a distribution diagram of the flue gas movement trajectory at the highest liquid level of the demist tower.

Figure 4 is a distribution diagram of the flue gas movement trajectory at the lowest liquid level of the demist tower.

Figure 5 is a distribution diagram of flue gas velocity at the highest liquid level of the demister tower.

Fig. 6 is a distribution diagram of flue gas velocity at the lowest liquid level of the demisting tower.

In the figure: 1, 4-expansion joint; 2-exit flue of absorption tower; 3-flue water delivery system; 5-inlet flue of defogging tower; 6-defogging tower;

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

A gypsum rain or chimney rain elimination and collection system suitable for wet desulfurization, comprising an absorption tower outlet flue 2, a flue water delivery system 3, a demist tower inlet flue 5, and a demist tower 6 connected in sequence. The inlet flue 5 of the demist tower is connected to the demist tower 6 through the expansion joint 4, and the top chimney 7 is set on the top of the demist tower 6. System 3 includes flue water delivery tank, water delivery pipeline and water collection tank.

After wet desulfurization, the flue gas is saturated wet flue gas with a temperature of 50°C. The flue gas enters the outlet flue 2 of the absorption tower through the absorption tower, and the fog droplets in the flue gas in the flue gas at the outlet flue of the absorption tower undergo inertial collisions and condense into large-particle mist Drops, part of the liquid in the flue gas flows to the flue water delivery system 3, and the flue gas enters the demist tower 6 through the flue water delivery system 3 and the entrance flue 5 of the demist tower, and the flue gas is discharged through the chimney 7 on the top of the tower after demisting .

Further, in order to slow down the lateral and vertical vibrations of the system during operation, the absorption tower is connected to the outlet flue 2 of the absorption tower using a non-metal expansion joint 1, and the inlet flue 5 of the demist tower and the water delivery tank are connected using a non-metal expansion joint 4 Connection; the outlet flue 2 of the absorption tower is a rectangular flue.

Further, in order to improve the liquid collection capacity of the flue water delivery system 3, the flue 2 at the outlet of the absorption tower connected to the water delivery tank is sloped towards the water delivery tank with a slope of 2-5 degrees.

Further, in order to improve the ability to eliminate gypsum rain or chimney rain, the entrance flue 5 of the demist tower is a rectangular flue, and the entrance is tangent to the demist tower 6, so that the flue gas enters the demist tower 6 along a tangential direction; The internal spiral movement of the mist removal tower 6 makes the mist removal tower 6 form a structure similar to a cyclone dust collector. The movement trajectory of the flue gas is shown in Figures 3 and 4, which improves the energy for eliminating gypsum rain or chimney rain.

Further, in order to improve the ability to eliminate gypsum rain or chimney rain, the flue gas velocity at the outlet flue 2 of the absorption tower and the flue 5 at the entrance of the demist tower is controlled to be 15~18m/s, and the air velocity of the demist tower is 1.8~3m/s s flue gas flow velocity distribution is shown in Figures 5 and 6, and the gas residence time is greater than 4s, the dynamic pressure of the flue gas decreases, the static pressure increases, the dew point of the flue gas decreases and more liquid is released, and the inertial collision and condensation of liquid droplets are improved at the same time. capacity, and finally the liquid is collected at the bottom of the demisting tower 6 under the action of gravity.

Further, in order not to affect the normal operation of boilers or sintering hosts, save investment and save land, etc., the demist tower 6 can be combined with the emergency slurry tank to store desulfurization slurry and collect liquid in the flue gas, saving land and investment.

Further, in order to improve the ability to eliminate gypsum rain or chimney rain, the tower top chimney 7 is installed on the demist tower 6, rigidly connected, the flue gas flow rate is 15~18m/s, the dynamic pressure of the flue gas rises, the net pressure drops, and the flue gas The dew point of the gas rises. According to the specific conditions of the project, the designed top elevation of the chimney on the top of the tower can reach up to about 90m.

Claims (5)

1. one kind is applicable to wet desulphurization gypsum rain or chimney rain and eliminates and gathering system, it is characterized in that comprising the absorption tower exhaust pass (2), flue water-carriage system (3), deentrainment tower gas approach (5), the deentrainment tower (6) that connect successively, described deentrainment tower gas approach (5) connects deentrainment tower (6) by expansion joint (4), at the top of deentrainment tower (6), tower top chimney (7) is set, exhaust pass (2) front end, described absorption tower connects expansion joint (1), and described flue water-carriage system (3) comprises flue water transmission trough, aqueduct and water leg.

2. one according to claim 1 is applicable to wet desulphurization gypsum rain or chimney rain and eliminates and gathering system, it is characterized in that described absorption tower exhaust pass (2) is rectangular flue, absorption tower exhaust pass (2) is connected with absorption tower by expansion joint (1).

3. one according to claim 1 is applicable to wet desulphurization gypsum rain or chimney rain and eliminates and gathering system, and it is characterized in that described absorption tower exhaust pass (2) is connected with water transmission trough, and carry out putting slope design, slope aspect water transmission trough, the gradient is 2 ~ 5 degree.

4. one according to claim 1 is applicable to wet desulphurization gypsum rain or chimney rain and eliminates and gathering system, it is characterized in that described deentrainment tower gas approach (5) is rectangular flue, entrance and deentrainment tower (6) tangent, make flue gas tangentially enter deentrainment tower (6) in direction.

5. one according to claim 1 is applicable to wet desulphurization gypsum rain or chimney rain and eliminates and gathering system, it is characterized in that described deentrainment tower gas approach (5) is connected for expansion joint (4) with between water transmission trough.