阅读说明：本技术 一种高效节水型石膏氯离子控制系统及方法 (Efficient water-saving gypsum chloride ion control system and method ) 是由 江莉 秦凡 卫国英 余云丹 葛洪良 于 2020-06-15 设计创作，主要内容包括：本发明提供了一种石膏氯离子控制系统及方法,控制系统包括：真空皮带脱水机,用于带动石膏移动,并将石膏滤液混合物输送至排气排水子系统,将石膏冲洗水混合物输送至所述排气排水子系统和回收喷洒子系统；排气排水子系统,连接所述真空皮带脱水机,用于将所述石膏滤液混合物以及所述石膏冲洗水混合物中的空气排出；以及回收喷洒子系统,连接所述排气排水子系统和所述真空皮带脱水机,用于回收所述排气排水子系统提供的排水以及所述石膏冲洗水混合物中的石膏冲洗水,并用所述排水和所述石膏冲洗水喷洒所述真空皮带脱水机上的所述石膏,以生成所述石膏滤液混合物和所述石膏冲洗水混合物。(The invention provides a gypsum chloride ion control system and a method, wherein the control system comprises: the vacuum belt dehydrator is used for driving the gypsum to move, conveying the gypsum filtrate mixture to the exhaust and drainage subsystem, and conveying the gypsum flushing water mixture to the exhaust and drainage subsystem and the recovery and spraying subsystem; the exhaust and drainage subsystem is connected with the vacuum belt dehydrator and is used for exhausting air in the gypsum filtrate mixture and the gypsum flushing water mixture; and a recovery spraying subsystem connected with the exhaust and drainage subsystem and the vacuum belt dehydrator and used for recovering the drainage provided by the exhaust and drainage subsystem and gypsum flushing water in the gypsum flushing water mixture and spraying the drainage and the gypsum flushing water on the vacuum belt dehydrator to generate the gypsum filtrate mixture and the gypsum flushing water mixture.)

1. A gypsum chloride ion control system, comprising:

the vacuum belt dehydrator is used for driving the gypsum to move, conveying the gypsum filtrate mixture to the exhaust and drainage subsystem, and conveying the gypsum flushing water mixture to the exhaust and drainage subsystem and the recovery and spraying subsystem;

the exhaust and drainage subsystem is connected with the vacuum belt dehydrator and is used for exhausting air in the gypsum filtrate mixture and the gypsum flushing water mixture; and a recovery spraying subsystem connected with the exhaust and drainage subsystem and the vacuum belt dehydrator and used for recovering the drainage provided by the exhaust and drainage subsystem and gypsum flushing water in the gypsum flushing water mixture and spraying the drainage and the gypsum flushing water on the vacuum belt dehydrator to generate the gypsum filtrate mixture and the gypsum flushing water mixture.

2. The gypsum chloride ion control system of claim 1, wherein the vacuum belt extractor comprises: the device comprises a belt, a vacuum groove, a gypsum filtrate water conduit, a gypsum filtrate drainage mother pipe, a gypsum flushing water conduit, a gypsum flushing water exhaust U-turn and a gypsum flushing water drainage pipe.

3. The gypsum chloride ion control system of claim 2,

the belt is used for driving the gypsum to move;

the vacuum groove is formed below the belt and is divided into:

a gypsum filtrate receiving area connected to at least one gypsum filtrate penstock;

a gypsum wash water receiving area connected to at least one gypsum wash water conduit;

the gypsum filtrate water conduit is communicated with the gypsum filtrate water drainage main pipe;

the gypsum flushing water diversion pipe is communicated with the gypsum flushing water drainage pipe, the gypsum flushing water drainage pipe is provided with a gypsum flushing water exhaust inverted U-shaped bend, and the gypsum flushing water exhaust inverted U-shaped bend is communicated with the gypsum filtrate drainage main pipe.

4. The gypsum chloride ion control system of claim 2,

the gypsum filtrate mixture comprises: gypsum filtrate and air; the gypsum flush water mixture comprises: gypsum flushing water and air;

the gypsum washing water drainage system is characterized in that the gypsum filtrate receiving area leads the gypsum filtrate mixture to a gypsum filtrate drainage main pipe, the gypsum washing water receiving area leads the gypsum washing water mixture to a gypsum washing water drainage pipe, the gypsum washing water mixture is subjected to gas-water separation under the action of a gypsum washing water exhaust reverse U-shaped bend, air enters the gypsum filtrate drainage main pipe through the gypsum washing water exhaust reverse U-shaped bend, and the gypsum washing water enters a recovery spraying subsystem along with the action of gravity and is recycled.

5. The gypsum chloride ion control system of claim 2, wherein the exhaust and drain subsystem comprises: a gas-water separator and a water ring vacuum pump.

6. The gypsum chloride ion control system of claim 5, wherein the gas-water separator is connected to the gypsum filtrate drain main, and the water-ring vacuum pump is connected to the gas-water separator;

the gas-water separator is used for carrying out gas-water separation on the gypsum filtrate mixture discharged from the gypsum filtrate drainage main pipe, the gypsum filtrate is discharged through the gas-water separator, and air is discharged through the water ring vacuum pump; and air in the gypsum flushing water mixture is discharged through the air-water separator and the water ring vacuum pump in sequence.

7. The gypsum chloride ion control system of claim 5, wherein the recovery spray subsystem comprises: a gypsum flushing water tank, a gypsum flushing water pump, a gypsum flushing water distributor and a gypsum flushing water discharge valve.

8. The gypsum chloride ion control system of claim 7, wherein the gypsum flush water tank is connected to the water ring vacuum pump and is in communication with the gypsum flush water drain; the gypsum flushing water tank is used for recovering gypsum flushing water introduced by the gypsum flushing water drainage pipe and introducing the gypsum flushing water into the water of the water ring vacuum pump for drainage;

the downstream of the gypsum flushing water tank is sequentially connected with a gypsum flushing water pump and a gypsum flushing water distributor; under the action of the gypsum flushing water pump, water in the gypsum flushing water tank is uniformly sprayed to gypsum on the belt through the gypsum flushing water distributor.

9. The gypsum chloride ion control system of claim 7 wherein a gypsum flush water drain valve is connected between the gypsum flush water pump and the gypsum flush water distributor; the gypsum flushing water discharge valve can discharge part of gypsum flushing water, and the discharged gypsum flushing water is used for flushing filter cloth of the vacuum belt dehydrator or supplementing water to the desulfurization absorption tower.

10. A gypsum chloride ion control method for controlling gypsum chloride ion concentration using the gypsum chloride ion control system of any one of claims 1-9, comprising:

step S1: the vacuum belt dehydrator drives the gypsum to move, the gypsum filtrate mixture is conveyed to the exhaust and drainage subsystem, and the gypsum flushing water mixture is conveyed to the exhaust and drainage subsystem and the recovery and spraying subsystem;

step S2: the exhaust and drainage subsystem exhausts air in the gypsum filtrate mixture and the gypsum flushing water mixture; and

step S3: the recovery spray subsystem recovers the drainage provided by the exhaust drainage subsystem and gypsum wash water in the gypsum wash water mixture and sprays the gypsum on the vacuum belt dewaterer with the drainage and gypsum wash water to produce a gypsum filtrate mixture and a gypsum wash water mixture.

Technical Field

The invention belongs to the technical field of environmental protection of thermal power plants, and particularly relates to a high-efficiency water-saving gypsum chloride ion control system and method.

Background

According to the building material industry standard of JC/T2074-2011 flue gas desulfurization gypsum, the content of chloride ions, which is used as a cement additive or a gypsum product raw material, of the desulfurization gypsum must be controlled and generally cannot be more than 100 ppm. Too high a level of chloride ions will adversely affect the gypsum product: such as corrosion of production equipment in applications of gypsum raw materials; when the gypsum is used as building materials such as cement additives and the like, the concrete reinforcing steel bars are corroded; gypsum products containing high concentrations of chloride ions cannot be completely dried, and gypsum plasterboards and the like can consequently lose strength or even decrease strength; the water-soluble chloride ions can migrate to the surface of the paper-surface gypsum board in the drying process to cause the separation of the paper board, and the bonding strength of the surface paper of the paper-surface gypsum board and the gypsum core material is seriously influenced, even is not bonded. Therefore, building material manufacturers, particularly gypsum board manufacturers, put forward higher requirements on the content of chloride ions.

According to research and understanding, the phenomenon that the content of chloride ions in gypsum produced by the limestone-gypsum wet flue gas desulfurization device of the existing thermal power plant is relatively high is common, and the phenomenon that the gypsum is always sold and is broken down or even sold is generated due to the fact that the content of the chloride ions exceeds the standard. In order to reduce the chloride ion concentration of the gypsum, the gypsum cake washing water of most of the desulfurization vacuum belt dewaterers is changed into process water. With the implementation of ultra-low emission, a low-temperature economizer is arranged in front of most of the desulfurization system, the temperature of smoke entering the desulfurization system is generally 90-100 ℃, the water consumption of the system is reduced, and the water quantity for flushing gypsum is controlled to be very low so as to ensure the water balance of the whole system. But a small amount of rinse water is insufficient to reduce the chloride ion concentration in the gypsum. Therefore, the application provides a high-efficiency water-saving gypsum chloride ion control process.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a high-efficiency water-saving gypsum chloride ion control system and method.

In order to achieve the above object, the present invention provides a gypsum chloride ion control system comprising:

the vacuum belt dehydrator is used for driving the gypsum to move, conveying the gypsum filtrate mixture to the exhaust and drainage subsystem, and conveying the gypsum flushing water mixture to the exhaust and drainage subsystem and the recovery and spraying subsystem;

the exhaust and drainage subsystem is connected with the vacuum belt dehydrator and is used for exhausting air in the gypsum filtrate mixture and the gypsum flushing water mixture; and a recovery spraying subsystem connected with the exhaust and drainage subsystem and the vacuum belt dehydrator and used for recovering the drainage provided by the exhaust and drainage subsystem and gypsum flushing water in the gypsum flushing water mixture and spraying the drainage and the gypsum flushing water on the vacuum belt dehydrator to generate the gypsum filtrate mixture and the gypsum flushing water mixture.

In some examples, the vacuum belt extractor includes: the device comprises a belt, a vacuum groove, a gypsum filtrate water conduit, a gypsum filtrate drainage mother pipe, a gypsum flushing water conduit, a gypsum flushing water exhaust U-turn and a gypsum flushing water drainage pipe.

In some instances, it is desirable to have,

the belt is used for driving the gypsum to move;

the vacuum groove is formed below the belt and is divided into:

a gypsum filtrate receiving area connected to at least one gypsum filtrate penstock;

a gypsum wash water receiving area connected to at least one gypsum wash water conduit;

the gypsum filtrate water conduit is communicated with the gypsum filtrate water drainage main pipe;

the gypsum flushing water diversion pipe is communicated with the gypsum flushing water drainage pipe, the gypsum flushing water drainage pipe is provided with a gypsum flushing water exhaust inverted U-shaped bend, and the gypsum flushing water exhaust inverted U-shaped bend is communicated with the gypsum filtrate drainage main pipe.

In some instances, it is desirable to have,

the gypsum filtrate mixture comprises: gypsum filtrate and air; the gypsum flush water mixture comprises: gypsum flushing water and air;

the gypsum washing water drainage system is characterized in that the gypsum filtrate receiving area leads the gypsum filtrate mixture to a gypsum filtrate drainage main pipe, the gypsum washing water receiving area leads the gypsum washing water mixture to a gypsum washing water drainage pipe, the gypsum washing water mixture is subjected to gas-water separation under the action of a gypsum washing water exhaust reverse U-shaped bend, air enters the gypsum filtrate drainage main pipe through the gypsum washing water exhaust reverse U-shaped bend, and the gypsum washing water enters a recovery spraying subsystem along with the action of gravity and is recycled.

In some examples, the exhaust drainage subsystem comprises: a gas-water separator and a water ring vacuum pump.

In some examples, the gas-water separator is connected with the gypsum filtrate drainage main pipe, and the water ring vacuum pump is connected with the gas-water separator;

the gas-water separator is used for carrying out gas-water separation on the gypsum filtrate mixture discharged from the gypsum filtrate drainage main pipe, the gypsum filtrate is discharged through the gas-water separator, and air is discharged through the water ring vacuum pump; and air in the gypsum flushing water mixture is discharged through the air-water separator and the water ring vacuum pump in sequence.

In some examples, the reclamation spray subsystem comprises: a gypsum flushing water tank, a gypsum flushing water pump, a gypsum flushing water distributor and a gypsum flushing water discharge valve.

In some examples, the gypsum flush water tank is connected to the water ring vacuum pump and is in communication with the gypsum flush water drain; the gypsum flushing water tank is used for recovering gypsum flushing water introduced by the gypsum flushing water drainage pipe and introducing the gypsum flushing water into the water of the water ring vacuum pump for drainage;

the downstream of the gypsum flushing water tank is sequentially connected with a gypsum flushing water pump and a gypsum flushing water distributor; under the action of the gypsum flushing water pump, water in the gypsum flushing water tank is uniformly sprayed to gypsum on the belt through the gypsum flushing water distributor.

In some examples, a gypsum flush water drain valve is connected between the gypsum flush water pump and the gypsum flush water distributor; the gypsum flushing water discharge valve can discharge part of gypsum flushing water, and the discharged gypsum flushing water is used for flushing filter cloth of the vacuum belt dehydrator or supplementing water to the desulfurization absorption tower.

The invention also provides a gypsum chloride ion control method, and the gypsum chloride ion control system controls the concentration of gypsum chloride ions and comprises the following steps:

step S1: the vacuum belt dehydrator drives the gypsum to move, the gypsum filtrate mixture is conveyed to the exhaust and drainage subsystem, and the gypsum flushing water mixture is conveyed to the exhaust and drainage subsystem and the recovery and spraying subsystem;

step S2: the exhaust and drainage subsystem exhausts air in the gypsum filtrate mixture and the gypsum flushing water mixture; and

step S3: the recovery spray subsystem recovers the drainage provided by the exhaust drainage subsystem and gypsum wash water in the gypsum wash water mixture and sprays the gypsum on the vacuum belt dewaterer with the drainage and gypsum wash water to produce a gypsum filtrate mixture and a gypsum wash water mixture.

Compared with the prior art, the invention has the following advantages: gypsum washing water is sprayed at a high flow rate, and the gypsum can be thoroughly washed through the high flow rate gypsum washing water, so that the content of chloride ions in the gypsum is efficiently reduced; gypsum flushing water is drained by the self-water-ring vacuum pump, process water does not need to be used independently, and the gypsum flushing water can be recycled independently by the recycling spraying subsystem and recycled repeatedly, so that the water utilization rate of the system is improved, and the water balance of the desulfurization system is not affected; the gypsum flushing water discharge valve can discharge part of gypsum flushing water, and the discharged gypsum flushing water can be used for flushing filter cloth of the vacuum belt dehydrator or supplementing water for the desulfurization absorption tower, so that waste can be avoided, and water resources are saved.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic structural diagram of a high-efficiency water-saving gypsum chloride ion control system according to an embodiment of the invention.

FIG. 2 is a flow chart of a method for controlling gypsum chloride ions in a water-saving and efficient manner according to an embodiment of the present invention.

In the figure:

1-vacuum belt dewatering machine;

11-vacuum groove, 12-gypsum filtrate water conduit, 13-gypsum filtrate drainage mother pipe, 14-gypsum flushing water conduit, 15-gypsum flushing water exhaust inverted U-bend and 16-gypsum flushing water drainage pipe;

2-a gas-water separator;

3-a water ring vacuum pump;

4-a flushing tank;

5-gypsum flushing pump;

6-gypsum flushing water distributor;

7-gypsum flushing water drain valve.

Detailed Description

The following description of the embodiments of the present invention with reference to the accompanying drawings is provided for further illustration of the embodiments of the present invention, and not for the purpose of limiting the invention.

As shown in fig. 1, the efficient water-saving gypsum chloride ion control system according to an embodiment of the present invention includes: the vacuum belt dehydrator 1, an exhaust and drainage subsystem and a recovery and spraying subsystem.

And the vacuum belt dehydrator is used for driving the gypsum to move, conveying the gypsum filtrate mixture to the exhaust and drainage subsystem, and conveying the gypsum flushing water mixture to the exhaust and drainage subsystem and the recovery and spraying subsystem.

And the exhaust and drainage subsystem is connected with the vacuum belt dehydrator and is used for exhausting air in the gypsum filtrate mixture and the gypsum flushing water mixture.

And a recovery spraying subsystem connected to the exhaust and drain subsystem and the vacuum belt dewaterer for recovering the drainage provided by the exhaust and drain subsystem and gypsum wash water from the gypsum wash water mixture and spraying gypsum on the vacuum belt dewaterer with the drainage and gypsum wash water to produce a gypsum filtrate mixture and a gypsum wash water mixture.

The vacuum belt dehydrator 1 includes: a belt, a vacuum groove 11, a gypsum filtrate water conduit 12, a gypsum filtrate water drainage mother pipe 13, a gypsum flushing water conduit 14, a gypsum flushing water exhaust inverted U-shaped bend 15 and a gypsum flushing water drainage pipe 16.

The belt is used for driving the gypsum to move.

The vacuum groove 11 is formed below the belt and is divided into: a gypsum filtrate receiving zone and a gypsum wash water receiving zone. The gypsum flushing water receiving area is opposite to the gypsum flushing water distributor of the recovery spraying subsystem. In one example, the gypsum wash water receiving area is located at a middle position of the vacuum tank 11, and the gypsum filtrate receiving area is located at both sides of the gypsum wash water receiving area.

The gypsum filtrate receiving area is connected to at least one gypsum filtrate penstock 12 and the gypsum rinse water receiving area is connected to at least one gypsum rinse water penstock 14. The gypsum filtrate water conduit 12 is communicated with a gypsum filtrate water drainage main pipe 13. The gypsum flushing water diversion pipe 14 is communicated with a gypsum flushing water drainage pipe 16, the gypsum flushing water drainage pipe 16 is provided with a gypsum flushing water exhaust inverted U-shaped bend 15, and the gypsum flushing water exhaust inverted U-shaped bend 15 is communicated with a gypsum filtrate drainage main pipe 13.

When the system of this application during operation, the belt drives the gypsum and removes, retrieves and sprays the gypsum on the subsystem sprays the belt with the gypsum sparge water. The gypsum filtrate mixture comprises: gypsum filtrate and air. The gypsum filtrate receiving zone directs the gypsum filtrate mixture to a gypsum filtrate drain header 13. The gypsum flush water mixture comprises: gypsum flush water with air. The gypsum flushing water receiving area leads the gypsum flushing water mixture to a gypsum flushing water drain pipe (16), the gypsum flushing water mixture is subjected to gas-water separation under the action of the gypsum flushing water exhaust reverse U-shaped bend 15, air enters the gypsum filtrate drain main pipe 13 through the gypsum flushing water exhaust reverse U-shaped bend 15, and the gypsum flushing water enters the recovery spraying subsystem along with the action of gravity and is recycled.

The exhaust and drainage subsystem comprises: a gas-water separator 2 and a water ring vacuum pump 3.

The gas-water separator 2 is connected with a gypsum filtrate drainage main pipe 13, and the water ring vacuum pump 3 is connected with the gas-water separator 2. The gas-water separator 2 performs gas-water separation on the gypsum filtrate mixture discharged from the gypsum filtrate discharge main pipe 13. The gypsum filtrate is discharged through a gas-water separator 2, and the air is discharged through a water ring vacuum pump 3. The air in the gypsum flushing water mixture is also discharged through the gas-water separator 2 and the water ring vacuum pump 3 in sequence.

The recovery spray subsystem includes: a gypsum flushing water tank 4, a gypsum flushing water pump 5, a gypsum flushing water distributor 6 and a gypsum flushing water discharge valve 7.

The gypsum flushing water tank 4 is connected with the water ring vacuum pump 3 and is communicated with a gypsum flushing water drain pipe 16. The gypsum flushing water tank 4 is used for recovering gypsum flushing water introduced from the gypsum flushing water discharge pipe 16 and introducing the water discharged from the water ring vacuum pump 2.

The downstream of the gypsum flushing water tank 4 is connected with a gypsum flushing water pump 5, a gypsum flushing water drain valve 7 and a gypsum flushing water distributor 6 in sequence. Under the action of a gypsum flushing water pump 5, water in a gypsum flushing water tank 4 is uniformly sprayed to gypsum on a belt through a gypsum flushing water distributor 6, so that the gypsum is washed to reduce the chloride ion content of the gypsum. In one example, the gypsum flush water distributor 6 is located in the middle of the vacuum belt dewaterer 1.

This embodiment adopts the high flow to spray the gypsum sparge water, through the high flow gypsum sparge water, can rinse the gypsum thoroughly, and the chloride ion content in the gypsum is reduced to the high efficiency. In one example, the flow rate of the gypsum flushing water pump 5 can be 2-5 times of the water discharge flow rate of the water ring vacuum pump 3, and the water quantity with the same water discharge amount of the water ring vacuum pump 3 is discharged in real time, so that the chloride ion concentration of the gypsum flushing water is below 1000 ppm. The gypsum sparge water of this embodiment connects from the drainage of water ring vacuum pump, does not need the exclusive use process water, retrieves and sprays the subsystem and can retrieve the gypsum sparge water alone, recycle to improved the water utilization ratio of system, not influence desulfurization system water balance.

Simultaneously, this embodiment still is connected with gypsum sparge water drain valve 7 between gypsum wash water pump 5 and gypsum wash water distributor 6, and gypsum sparge water drain valve 7 can be discharged partial gypsum sparge water, and the exhaust gypsum sparge water can be used for vacuum belt hydroextractor filter cloth to wash or for the moisturizing of desulfurization absorption tower, can not cause the waste to the water resource has been practiced thrift.

As shown in fig. 2, another embodiment of the present invention further provides a high-efficiency water-saving gypsum chloride ion control method, which utilizes the high-efficiency water-saving gypsum chloride ion control system of the previous embodiment to control the gypsum chloride ion concentration, and includes:

step S1: the vacuum belt dehydrator drives the gypsum to move, the gypsum filtrate mixture is conveyed to the exhaust and drainage subsystem, and the gypsum flushing water mixture is conveyed to the exhaust and drainage subsystem and the recovery and spraying subsystem.

Step S2: the exhaust and drain subsystem exhausts air from the gypsum filtrate mixture and the gypsum flush water mixture.

Step S3: the recovery spray subsystem recovers the drainage provided by the exhaust drainage subsystem and gypsum wash water in the gypsum wash water mixture and sprays the gypsum on the vacuum belt dewaterer with the drainage and gypsum wash water to produce a gypsum filtrate mixture and a gypsum wash water mixture.