CN215798596U

CN215798596U - Metering and conveying device

Info

Publication number: CN215798596U
Application number: CN202120231398.5U
Authority: CN
Inventors: 梁小烽; 王双库; 王琼; 谭晓波
Original assignee: Guangzhou Dongfang Electric Power Co ltd; Guangzhou Zhujiang Electric Power Co ltd
Current assignee: Guangzhou Dongfang Electric Power Co ltd; Guangzhou Zhujiang Electric Power Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2022-02-11
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a metering and conveying device, which comprises an ash storage hopper, a feeding bin with a first cavity, an air feeder, a pressure transmitter for detecting the pressure in the first cavity, a material level indicator arranged in the first cavity, a metering bin with a second cavity, a weighing sensor arranged in the second cavity, and a reaction tank with a third cavity, wherein the feeding bin is provided with a first cavity; the ash storage hopper is provided with an ash falling port, the feeding bin is provided with an ash inlet, an air inlet and an ash outlet, the metering bin is provided with a feed inlet and a discharge outlet, the reaction tank is provided with an ash supply port, a liquid supply port and a discharge port, the ash falling port is communicated with the ash inlet and provided with a first valve body at the ash inlet, the output port of the air supply device is communicated with the air inlet, the ash outlet is communicated with the feed inlet and provided with a second valve body at the ash outlet, and the discharge port is communicated with the ash supply port and provided with a third valve body at the ash supply port. The utility model can automatically and accurately measure the fly ash and convey the fly ash to the reaction tank to react with the desulfurization wastewater, and is beneficial to better realizing zero emission of the desulfurization wastewater.

Description

Metering and conveying device

Technical Field

The utility model relates to the technical field of production waste conveying devices of coal-fired power plants, in particular to a metering conveying device.

Background

The flue gas desulfurization wastewater of the coal-fired power plant has high salt content and complex water quality composition, contains a large amount of suspended matters (gypsum particles, SiO2, hydroxides of Al and Fe), chloride ions (Cl-), fluorides and trace heavy metals such As Cd, Hg, As, Pb, Cu, Zn and the like, has high treatment difficulty and difficult recycling, and becomes one of key factors for restricting the realization of zero emission of the wastewater of the power plant.

For the treatment of the desulfurization wastewater, at present, a power plant generally adopts a physical and chemical method for pretreatment, and removes the excessive calcium and magnesium hardness, suspended matters, heavy metals, sulfate radicals and the like in the desulfurization wastewater by methods of neutralization, precipitation, flocculation, clarification, oxidation and the like, and the mass concentration of Cl < - > in the treated desulfurization wastewater can still reach 5000-. In order to further desalt and dechlorinate, concentration and decrement are carried out, such as membrane separation, electrodialysis method and the like, and finally tail end treatment is carried out, such as evaporation crystallization method, flue evaporation method and flue dechlorination method. The zero-emission technologies need combination of a plurality of processes, the method has the greatest advantage that no wastewater is discharged, but the method has the problems of high investment and operation cost, high energy consumption, difficulty in treatment of byproducts such as miscellaneous salts and the like, low commissioning rate, easiness in idle waste and the like.

The method has the advantages that the method has high efficiency and good effect of adsorbing and removing pollutants such as Cl-ions, F-ions, heavy metal ions and the like which are difficult to remove in the desulfurization wastewater by using the fly ash as the adsorbent, but the matched equipment and device are not perfect, and the problems of complex operation, high labor intensity of workers, dust flying and escape in the whole process and the like are caused by the main problems of low automation degree, manual carrying, weighing and adding and the like when the fly ash is added into a desulfurization wastewater advanced treatment system as the adsorbent.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems in the prior art, the utility model aims to: the utility model provides a metering and conveying device, which can automatically and accurately meter fly ash in a fully-sealed space and convey the fly ash into a reaction tank to react with desulfurization wastewater, and is beneficial to better realizing zero emission of the desulfurization wastewater.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a metering and conveying device comprises an ash storage hopper, a feeding bin with a first cavity, an air feeder, a pressure transmitter for detecting the pressure in the first cavity, a material level indicator arranged in the first cavity, a metering bin with a second cavity, a weighing sensor arranged in the second cavity, and a reaction tank with a third cavity;

the ash storage hopper is provided with an ash falling port; the feeding bin is provided with an ash inlet, an air inlet and an ash outlet which are communicated with the first cavity; a feed inlet and a discharge outlet which are communicated with the second cavity are arranged on the metering bin; the reaction tank is provided with an ash supply port, a liquid supply port and a discharge port which are communicated with the third cavity; the ash falling port is communicated with the ash inlet, the ash inlet is provided with a first valve body, the outlet of the air feeder is communicated with the air inlet, the ash outlet is communicated with the feed inlet, the ash outlet is provided with a second valve body, and the discharge port is communicated with the ash supply port and provided with a third valve body.

Further, the metering and conveying device also comprises a motor arranged on the reaction tank and a stirring paddle connected with the output end of the motor; the stirring paddle is positioned in the third cavity.

Further, the air supplier comprises an air compressor, a main air conveying pipe connected with the output end of the air compressor, and a first branch pipe communicated with the main air conveying pipe; the air inlet is connected with the air inlet through a first branch pipe, the air inlet is connected with the air inlet through a second branch pipe, and the air inlet is connected with the air inlet through a second branch pipe.

Further, the air feeder further comprises a second branch pipe; the feeding bin is further provided with a pressurization port communicated with the first cavity, one end of the second branch pipe is connected with the main gas conveying pipe, the other end of the second branch pipe is connected to the pressurization port, the first branch pipe is provided with a fifth valve body, and the second branch pipe is provided with a pressurization valve and a sixth valve body.

Further, the gas supplier further comprises a third branch pipe; the first branch pipe and the second branch pipe are communicated with the third branch pipe, and the pressure transmitter is installed on the third branch pipe.

Further, the metering and conveying device also comprises a first ash conveying pipe; one end of the first ash conveying pipe is connected to the ash falling port, the other end of the first ash conveying pipe is connected to the ash inlet, and a seventh valve body is installed at the ash falling port.

Further, the metering and conveying device also comprises a second ash conveying pipe; one end of the second ash conveying pipe is connected to the ash outlet, the other end of the second ash conveying pipe is connected to the ash inlet, and the eighth valve body is installed at the ash inlet.

Further, the metering and conveying device also comprises a third ash conveying pipe; one end of the third ash conveying pipe is connected to the discharge port, the other end of the third ash conveying pipe is connected to the ash supply port, and a ninth valve body is installed at the discharge port.

Further, a ball valve is arranged at the liquid supply opening, a discharge pipe is connected to the discharge opening, and a tenth valve body is mounted on the discharge pipe.

Furthermore, the metering bin is further provided with a dust removal port communicated with the second cavity, and a dust remover is installed at the dust removal port.

Compared with the prior art, the utility model has the beneficial effects that: the utility model is used for treating fly ash after dust removal and collection of coal-fired fly ash of a thermal power plant. The fly ash is discharged from an ash storage hopper of a coal-fired power plant, is conveyed by totally closed pneumatic conveying of a feeding bin and a metering bin, is accurately metered by a weighing sensor, and is finally automatically added into a reaction tank containing desulfurization wastewater in a controlled amount for adsorption reaction, and pollutants such as Cl-ions, F-ions, heavy metal ions and the like which are difficult to remove in the desulfurization wastewater are removed by the fly ash. The device has realized full automated control, measurement accuracy, fly ash are reinforced portably, whole airtight, great reduction workman working strength, avoided the fly ash to reveal, are favorable to recycling of fly ash, effectively promote the better realization of desulfurization waste water zero release.

Drawings

Fig. 1 is a schematic structural view of a metering and conveying device.

In the figure, 1 is an ash storage hopper, 2 is a feed bin, 3 is an air feeder, 4 is a pressure transmitter, 5 is a level indicator, 6 is a measuring bin, 7 is a reaction tank, 8 is a dust remover, 9 is a motor, 10 is a stirring paddle, 11 is an ash falling port, 21 is a first cavity, 22 is an ash inlet, 23 is an air inlet, 24 is an ash outlet, 25 is a pressurizing port, 31 is a total air pipe, 32 is a first branch pipe, 33 is a second branch pipe, 34 is a third branch pipe, 35 is an air compressor, 61 is a second cavity, 62 is an inlet, 63 is an outlet, 64 is a dust removing port, 71 is a third cavity, 72 is an ash supply port, 73 is a liquid supply port, 74 is an outlet, 100 is a weighing sensor, 101 is a first valve body, 102 is a second valve body, 103 is a third valve body, 104 is a fourth valve body, 105 is a fifth valve body, 106 is a sixth valve body, 107 is a seventh valve body, 108 is an eighth valve body, and 109 is a ninth valve body, 110 is a tenth valve body, 111 is a pressure increasing valve, 112 is a ball valve, 113 is a discharge pipe, 114 is a first ash conveying pipe, 115 is a second ash conveying pipe, and 116 is a third ash conveying pipe.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For convenience of description, unless otherwise noted, the up-down direction described below coincides with the up-down direction of fig. 1 itself, and the left-right direction described below coincides with the left-right direction of fig. 1 itself.

As shown in fig. 1, the present embodiment provides a metering and conveying device, which comprises an ash storage hopper 1, a feeding bin 2 with a first cavity 21, an air feeder 3, a pressure transmitter 4 for detecting the pressure in the first cavity 21, a level gauge 5 installed in the first cavity 21, a metering bin 6 with a second cavity 61, a weighing sensor 100 installed in the second cavity 61, and a reaction tank 7 with a third cavity 71; the ash hopper 1 has a sealed cavity. The gas feeder 3 may deliver gas to fluidize and transport the fly ash. The first cavity 21, the second cavity 61 and the third cavity 71 are sealed spaces. The level indicator 5 is used for calculating the amount of the fly ash in the feeding bin 2, and the weighing sensor 100 can detect the amount of the fly ash flowing to the reaction tank 7 from the metering bin 6.

The ash storage hopper 1 is provided with an ash falling port 11, and the ash falling port 11 is positioned at the lower end of the ash storage hopper 1 and communicated with the sealed cavity. The feeding bin 2 is provided with an ash inlet 22, an air inlet 23 and an ash outlet 24 which are communicated with the first cavity 21, the ash inlet 22 is positioned at the upper end of the feeding bin 2, the ash outlet 24 is positioned at the upper end of the feeding bin 2, and the air inlet 23 is positioned at the lower end of the feeding bin 2. The metering bin 6 is provided with a feed inlet 62 and a discharge outlet 63 which are both communicated with the second cavity 61, the feed inlet 62 is positioned at the upper end of the metering bin 6, and the discharge outlet 63 is positioned at the lower end of the metering bin 6. The reaction tank 7 is provided with an ash supply port 72, a liquid supply port 73 and a discharge port 74 which are communicated with the third cavity 71, the ash supply port 72 and the liquid supply port 73 are both positioned at the upper end of the reaction tank 7, the discharge port 74 is positioned at the lower end of the reaction tank 7, and the liquid supply port 73 is used for infusing desulfurization wastewater into the third cavity 71 of the reaction tank 7. The ash falling port 11 is communicated with the ash inlet 22, a first valve body 101 is arranged at the ash inlet 22, and when the first valve body 101 is opened, the ash storage hopper 1 is positioned above the feeding bin 2. The fly ash in the ash storage hopper 1 enters the first cavity 21 of the feeding bin 2 from the ash falling port 11 through the first valve body 101 and the ash inlet 22. The outlet of the gas feeder 3 is communicated with the gas inlet 23, and the gas feeder 3 feeds gas into the first cavity 21 of the feed bin 2 from the gas inlet 23 and fluidizes the fly ash in the first cavity 21. The ash outlet 24 is communicated with the feeding hole 62, a second valve body 102 is arranged at the ash outlet 24, the second valve body 102 is in signal connection with the pressure transmitter 4, the second valve body 102 is automatically opened after the pressure in the first cavity 21 of the feeding bin 2 reaches a certain value, and the fly ash enters the second cavity 61 of the metering bin 6 under the conveying of gas. The metering bin 6 is located above the reaction tank 7. The discharge port 63 is communicated with the ash supply port 72, the third valve body 103 is arranged at the ash supply port 72, after the desulfurization wastewater is injected into the reaction tank 7, the third valve body 103 is opened, the fly ash falls into the reaction tank 7 from the metering bin 6, the weighing sensor 100 detects the amount of the fly ash which can fall into the reaction tank 7 and can send signals for control, the third valve body 103 is opened and closed, the fly ash reacts with the desulfurization wastewater to form the gray water, and finally the gray water is discharged from the discharge port 74, so that the quantitative conveying of the fly ash and the treatment of the desulfurization wastewater are completed. The first valve body 101 is a pneumatic feed valve, the second valve body 102 is a pneumatic discharge valve, and the third valve body 103 is a pneumatic feed valve.

Specifically, in one embodiment, the metering and conveying device further comprises a motor 9 mounted on the reaction tank 7, and a stirring paddle 10 connected with an output end of the motor 9; the paddle 10 is located within the third cavity 71. The reaction of the fly ash and the desulfurization wastewater is accelerated by arranging the stirring paddle 10, and the treatment efficiency of the desulfurization wastewater is improved.

Specifically, in one embodiment, the air supplier 3 includes an air compressor 35, a manifold 31 connected to an output end of the air compressor 35, and a first branch pipe 32 communicating with the manifold 31; the fourth valve body 104 is installed on the main gas pipe 31, and the fourth valve body 104 is a gas source control valve. One end of the first branch pipe 32 is connected to the air collecting duct 31, and the other end of the first branch pipe 32 is connected to the air inlet 23. The fourth valve body 104 is a main gas transmission valve, after the fourth valve body 104 is opened, gas enters the feeding bin 2 from the main gas transmission pipe 31 through the first branch pipe 32 so that the fly ash in the feeding bin 2 is fluidized, and after the second valve body 102 is opened, the gas generated by the air compressor 35 can also be used as power to send the fly ash to the metering bin 6 from the feeding bin 2.

Specifically, in one embodiment, the gas supplier 3 further includes a second branch pipe 33; the feeding bin 2 is further provided with a pressurization port 25 communicated with the first cavity 21, one end of a second branch pipe 33 is connected with the main gas conveying pipe 31, the other end of the second branch pipe 33 is connected at the pressurization port 25, the first branch pipe 32 is provided with a fifth valve body 105, and the second branch pipe 33 is provided with a pressurization valve 111 and a sixth valve body 106. When it is desired to enhance the fluidisation of the fly ash in the feed bin 2, a pressurisation port 25 and a second branch pipe 33 may be provided to increase the gas delivery, the second branch pipe 33 being provided with a pressurisation valve 111 to increase the pressure in the feed bin 2. The fifth valve body 105 is installed on the first branch pipe 32, and the sixth valve body 106 is installed on the second branch pipe 33, so that the first branch pipe 32 and the second branch pipe 33 can operate independently without interference. The fifth valve body 105 and the sixth valve body 106 are both check valves.

Specifically, in one embodiment, the gas supplier 3 further includes a third branch pipe 34; the first branch pipe 32 and the second branch pipe 33 are both communicated with a third branch pipe 34, and the pressure transmitter 4 is mounted on the third branch pipe 34. When the pressure increasing valve 111, the fifth valve body 105 and the sixth valve body 106 are all opened, the third branch pipe 34 is communicated with the feeding bin 2 through the first branch pipe 32 and the second branch pipe 33, the pressure transmitter 4 can detect the pressure in the feeding bin 2, and the pressure transmitter 4 is prevented from being damaged due to overlarge pressure when the pressure transmitter 4 is installed in the feeding bin 2.

Specifically, in one embodiment, the metering conveyor further includes a first ash delivery tube 114; the first ash conveying pipe 114 is vertically arranged, the upper end of the first ash conveying pipe 114 is connected to the ash falling port 11, the lower end of the first ash conveying pipe 114 is connected to the ash inlet 22, and the seventh valve 107 is installed at the ash falling port 11. The seventh valve body 107 is located above the first valve body 101, the seventh valve body 107 is a pneumatic gate valve, and the seventh valve body 107 can be closed to prevent the fly ash in the ash storage hopper 1 from flowing out, so that the ash storage hopper 1 can be conveniently separated and maintained in the feeding bin 2.

Specifically, in one embodiment, the metering conveyor further comprises a second ash tube 115; one end of the second ash conveying pipe 115 is connected to the ash outlet 24, the other end of the second ash conveying pipe 115 is connected to the feed inlet 62, and the eighth valve body 108 is installed at the feed inlet 62. The eighth valve body 108 is a pneumatic feeding valve, and the feeding bin 2 and the metering bin 6 can be conveniently separated and maintained by closing the eighth valve body 108.

Specifically, in one embodiment, the metering conveyor further comprises a third ash tube 116; one end of the third ash conveying pipe 116 is connected to the position of the discharge port 63, the other end of the third ash conveying pipe 116 is connected to the position of the ash supply port 72, and the ninth valve body 109 is installed at the position of the discharge port 63. The ninth valve body 109 is a rotary discharge valve, and the metering bin 6 and the reaction tank 7 can be conveniently separated and maintained by closing the ninth valve body 109.

Specifically, in one embodiment, a ball valve 112 is disposed at the liquid supply port 73, a discharge pipe 113 is connected to the discharge port 74, and the tenth valve body 110 is mounted on the discharge pipe 113. The tenth valve body 110 is a pneumatic drain valve. The tenth valve body 110 is closed first, and when the fly ash and the desulfurization wastewater fully react, the tenth valve body 110 is opened to discharge the grey water.

Specifically, in one embodiment, the metering bin 6 is further provided with a dust removal opening 64 communicated with the second cavity 61, a dust remover 8 is installed at the dust removal opening 64, and the dust remover 8 can clean dust raised in the metering bin 6.

This device carries out automatic control through PLC or DCS, interlocks all components on the whole equipment, according to setting, controls opening and closing and other components's of each valve operation.

The working process of the utility model is as follows:

the first step is as follows: after the system is started, a material using instruction is given, the first valve body and the seventh valve body are opened, the fly ash is discharged from the ash storage hopper, and the fly ash automatically falls into the feeding bin under the action of gravity.

The second step is that: after the fly ash in the feeding bin is accumulated to a certain amount, the material level meter sends a full material signal, and the first valve body is automatically closed to finish feeding. And when the air compressor is opened, the fourth valve body and the fifth valve body are opened, compressed air enters from the bottom of the feeding bin through the first branch pipe, so that the fly ash in the feeding bin is fluidized. In order to fully fluidize the fly ash, the pressurizing valve and the sixth valve body can be opened simultaneously, compressed air is also fed through the second branch pipe simultaneously, and the air pressure in the feeding bin gradually rises in the fluidizing process of the fly ash.

The third step: when the pressure in the feeding bin reaches a certain value, the pressure transmitter sends a signal, the second valve body and the eighth valve body are automatically opened, the fluidization of the fly ash is further enhanced, when the pressure in the feeding bin rises to be higher than the pipeline resistance of the second ash conveying pipe, the pneumatic conveying starts, and the fly ash enters the metering bin from the second ash conveying pipe under the action of input compressed air while being fluidized. When the conveying of the fly ash in the feeding bin is finished and the pressure in the feeding bin is reduced to be lower than the pipeline resistance of the second ash conveying pipe, the pressure transmitter sends out a signal, and the air compressor continues to convey air to enable the pressure to continue for a certain time so as to clean the second ash conveying pipe by utilizing the compressed air. And after cleaning is finished, the fourth valve body is closed, and after a certain time delay, the second valve body is closed, so that a one-time conveying process is finished. In the process, the dust remover can treat dust generated by the fly ash.

The fourth step: and injecting a certain amount of desulfurization wastewater into the reaction tank through a ball valve, then opening the ninth valve body and the third valve body, putting the fly ash into the reaction tank containing the desulfurization wastewater, simultaneously weighing by using a weighing sensor to measure the amount of the fly ash falling into the reaction tank, when the set adding amount is reached, sending a signal by using the weighing sensor, automatically closing the ninth valve body and the third valve body, simultaneously starting a motor, stirring by using a stirring paddle, fully mixing the fly ash and the desulfurization wastewater, and carrying out adsorption reaction to form the grey water.

The fifth step: and after the reaction is finished, opening the tenth valve body, and discharging the grey water after the reaction to enter the next treatment stage.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A metering delivery device characterized by: the device comprises an ash storage hopper, a feeding bin with a first cavity, an air feeder, a pressure transmitter for detecting the pressure in the first cavity, a level indicator arranged in the first cavity, a metering bin with a second cavity, a weighing sensor arranged in the second cavity and a reaction tank with a third cavity;

2. A metering delivery apparatus as claimed in claim 1, wherein: the reaction kettle also comprises a motor arranged on the reaction tank and a stirring paddle connected with the output end of the motor; the stirring paddle is positioned in the third cavity.

3. A metering delivery apparatus as claimed in claim 1, wherein: the air supplier comprises an air compressor, a main air conveying pipe connected with the output end of the air compressor, and a first branch pipe communicated with the main air conveying pipe; the air inlet is connected with the air inlet through a first branch pipe, the air inlet is connected with the air inlet through a second branch pipe, and the air inlet is connected with the air inlet through a second branch pipe.

4. A metering delivery apparatus as claimed in claim 3, wherein: the gas supplier further comprises a second branch pipe; the feeding bin is further provided with a pressurization port communicated with the first cavity, one end of the second branch pipe is connected with the main gas conveying pipe, the other end of the second branch pipe is connected to the pressurization port, the first branch pipe is provided with a fifth valve body, and the second branch pipe is provided with a pressurization valve and a sixth valve body.

5. A metering delivery apparatus as claimed in claim 3, wherein: the gas supplier further comprises a third branch pipe; the first branch pipe and the second branch pipe are communicated with the third branch pipe, and the pressure transmitter is installed on the third branch pipe.

6. A metering delivery apparatus as claimed in claim 1, wherein: the first ash conveying pipe is also included; one end of the first ash conveying pipe is connected to the ash falling port, the other end of the first ash conveying pipe is connected to the ash inlet, and a seventh valve body is installed at the ash falling port.

7. A metering delivery apparatus as claimed in claim 1, wherein: the second ash conveying pipe is also included; one end of the second ash conveying pipe is connected to the ash outlet, the other end of the second ash conveying pipe is connected to the ash inlet, and the eighth valve body is installed at the ash inlet.

8. A metering delivery apparatus as claimed in claim 1, wherein: the ash removing device also comprises a third ash conveying pipe; one end of the third ash conveying pipe is connected to the discharge port, the other end of the third ash conveying pipe is connected to the ash supply port, and a ninth valve body is installed at the discharge port.

9. A metering delivery apparatus as claimed in claim 1, wherein: the liquid supply opening is provided with a ball valve, the discharge opening is connected with a discharge pipe, and a tenth valve body is installed on the discharge pipe.

10. A metering delivery apparatus as claimed in claim 1, wherein: the metering bin is further provided with a dust removal port communicated with the second cavity, and a dust remover is installed at the dust removal port.