阅读说明：本技术 一种基于密度分配的湿法石灰石制浆系统 (Wet limestone pulping system based on density distribution ) 是由 何海涛 沈平 陈彦秋 张泉水 浦佳栋 刘伟 王超 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种基于密度分配的湿法石灰石制浆系统,包括多套石灰石制备子系统和多个石灰石浆液箱,石灰石制备子系统包括石灰石筒仓、皮带给料机、湿式球磨机、再循环箱、石灰石旋流器和浆液分配装置,石灰石筒仓的出料口设于皮带给料机的起始端上方,湿式球磨机的进料口设于皮带给料机的末端下方,湿式球磨机的出液口与再循环箱的进液口连通,再循环箱的出液口与石灰石旋流器的进液口连通,石灰石旋流器的溢流口与浆液分配装置的进口连通,浆液分配装置的出口分别与再循环箱、石灰石浆液箱的进口连通,石灰石旋流器的底流口通过管路与再循环箱的进液口连通。与现有技术相比,本发明具有生产石灰石浆液的质量高、系统可靠性高等优点。(The invention relates to a wet limestone pulping system based on density distribution, which comprises a plurality of sets of limestone preparation subsystems and a plurality of limestone slurry tanks, wherein the limestone preparation subsystems comprise limestone silos, belt feeders and wet ball mills, the system comprises a recirculation box, a limestone cyclone and a slurry distribution device, wherein a discharge port of a limestone silo is arranged above the starting end of a belt feeder, a feed port of a wet ball mill is arranged below the tail end of the belt feeder, a liquid outlet of the wet ball mill is communicated with a liquid inlet of the recirculation box, a liquid outlet of the recirculation box is communicated with a liquid inlet of the limestone cyclone, an overflow port of the limestone cyclone is communicated with an inlet of the slurry distribution device, an outlet of the slurry distribution device is respectively communicated with inlets of the recirculation box and the limestone slurry box, and a bottom flow port of the limestone cyclone is communicated with the liquid inlet of the recirculation box through a pipeline. Compared with the prior art, the method has the advantages of high quality of limestone slurry production, high system reliability and the like.)

1. The wet limestone pulping system based on density distribution is characterized by comprising a plurality of sets of limestone preparation subsystems and a plurality of limestone slurry tanks (7),

the limestone preparation subsystem comprises a limestone silo (1), a belt feeder (2), a wet ball mill (3), a recirculation box (4), a limestone cyclone (5) and a slurry distribution device (6),

the discharge gate of lime stone silo (1) locate the initiating terminal top of belt feeder (2), the feed inlet of wet ball mill (3) locate the terminal below of belt feeder (2), the liquid outlet of wet ball mill (3) and the inlet intercommunication of recirculation case (4), the liquid outlet of recirculation case (4) and the inlet intercommunication of lime stone swirler (5), the overflow mouth of lime stone swirler (5) and the import intercommunication of thick liquid distributor (6), the export of thick liquid distributor (6) respectively with the import intercommunication of recirculation case (4), lime stone thick liquid case (7), the underflow opening of lime stone swirler (5) pass through the inlet intercommunication of pipeline and recirculation case (4).

2. The wet limestone pulping system based on density distribution according to the claim 1, characterized in that the slurry distribution device (6) comprises a densimeter (11), an adjustable blanking pipe and a blanking hopper (14), the densimeter (11) is arranged on a pipeline between an overflow port of the limestone cyclone (5) and the slurry distribution device (6), a recirculation hopper (15) and a plurality of slurry tank hoppers (16) are arranged in the blanking hopper (14), the discharge hole of the recycling hopper (15) is communicated with the inlet of the recycling box (4) through a pipeline, the discharge hole of the slurry tank hopper (16) is communicated with the limestone slurry tank (7) through a pipeline, the feeding hole of the adjustable blanking pipe is communicated with the overflow port of the limestone cyclone (5) through a pipeline, and the discharging hole of the adjustable blanking pipe is arranged in the blanking hopper (14).

3. The wet limestone pulping system based on density distribution according to claim 2, wherein the adjustable blanking pipe comprises an electric push rod (12) and a blanking pipe main body (13), the electric push rod (12) is arranged on a side surface of the blanking pipe main body (13), a tail end of the electric push rod (12) is connected with an outlet of the blanking pipe main body (13), and the electric push rod (12) operates to drive the outlet of the blanking pipe main body (13) to respectively face the recirculation hopper (15) and the slurry tank hopper (16) for discharging.

4. A wet limestone pulping system based on density distribution according to claim 2, characterized in that the pulping system comprises two limestone slurry tanks (7), the blanking hopper (14) is provided with a recycling hopper (15) and two slurry tank hoppers (16), and the discharge ports of the two slurry tank hoppers (16) are respectively communicated with the two limestone slurry tanks (7) through pipelines.

5. The wet limestone pulping system based on density distribution according to the claim 1, characterized in that the bottom of the limestone silo (1) is provided with a motor vibration feeder (10), and the discharge port of the motor vibration feeder (10) is positioned above the starting end of the belt feeder (2).

6. The wet limestone pulping system based on density distribution according to claim 1, wherein the discharge port of the limestone silo (1) is provided with an air cannon (9) for preventing discharge blockage.

7. A wet limestone pulping system based on density distribution according to claim 1, characterized in that the pulping system further comprises a limestone slurry pump (8), the limestone slurry pump (8) being provided on a liquid outlet pipe of the recirculation tank (4).

8. The wet limestone pulping system based on density distribution according to claim 1, wherein the belt feeder (2) is a weighing belt feeder (2).

9. The wet limestone pulping system based on density distribution of claim 1, wherein the pulping system comprises three sets of limestone preparation subsystems.

10. A wet limestone pulping system based on density distribution according to claim 1, characterized in that the pulping system comprises two limestone slurry tanks (7).

Technical Field

The invention relates to the field of wet limestone pulping, in particular to a density distribution-based wet limestone pulping system.

Background

In coal-fired power plants, steel plants and other industries in China which use coal as fuel, sulfur dioxide SO2 is generated by combustion of coal in the production process, and the most mature technology for treating sulfur dioxide in flue gas in China is the wet flue gas desulfurization technology. Limestone-gypsum wet flue gas desulfurization is the most common flue gas treatment technology which is most widely applied at present. Limestone-gypsum wet desulphurization technology is that limestone slurry with a certain concentration is prepared and pumped into an absorption tower as an absorbent, the limestone slurry is fully contacted and mixed with flue gas through a slurry circulating pump, sulfur dioxide in the flue gas reacts with calcium carbonate in the slurry, forced oxidation reaction is carried out through air blown in from the lower part of the tower, calcium sulfate (CaSO4) is finally generated, and after the calcium sulfate reaches a certain saturation degree, the calcium sulfate is crystallized to form calcium sulfate dihydrate (CaSO 4.2H2O). The gypsum slurry discharged from the absorption tower is concentrated and dehydrated to make its water content less than 10%.

In the existing wet limestone pulping system, limestone is ground and then sent into a cyclone for sorting, and qualified limestone slurry after sorting is sent into a limestone slurry tank through an overflow port of the cyclone. However, when the limestone preparation system fails, the prepared limestone slurry is unqualified, the wet ball mill does not operate and other working conditions, the direct delivery of the overflow into the limestone slurry tank can cause the unqualified quality of the limestone slurry, and the desulfurization effect of wet flue gas desulfurization is affected.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned deficiencies of the prior art and providing a wet limestone pulping system based on density distribution.

A wet limestone pulping system based on density distribution comprises a plurality of sets of limestone preparation subsystems and a plurality of limestone slurry tanks,

the limestone preparation subsystem comprises a limestone silo, a belt feeder, a wet ball mill, a recirculation box, a limestone cyclone and a slurry distribution device,

the discharge gate of lime stone silo locate belt feeder's initiating terminal top, wet ball mill's feed inlet locate belt feeder's end below, wet ball mill's liquid outlet and recirculation case's inlet intercommunication, recirculation case's liquid outlet and lime stone swirler's inlet intercommunication, lime stone swirler's overflow mouth and slurry distribution device's import intercommunication, slurry distribution device's export communicate with recirculation case, lime stone slurry tank's import respectively, lime stone swirler's underflow mouth communicate through pipeline and recirculation case's inlet.

Preferably, the thick liquid distributor include densimeter, adjustable blanking pipe and blanking fill, the densimeter locate on the overflow mouth of limestone cyclone and the pipeline between thick liquid distributor, the blanking fill in be equipped with recirculation hopper and a plurality of thick liquid case hopper, the discharge gate of recirculation hopper pass through the pipeline and the import intercommunication of recirculation case, the discharge gate of thick liquid case hopper pass through pipeline and limestone slurry case intercommunication, the feed inlet of adjustable blanking pipe pass through the overflow mouth intercommunication of pipeline and limestone cyclone, adjustable blanking pipe discharge gate locate in the blanking fill.

Preferably, the adjustable blanking pipe comprises an electric push rod and a blanking pipe main body, the electric push rod is arranged on the side face of the blanking pipe main body, the tail end of the electric push rod is connected with an outlet of the blanking pipe main body, and the electric push rod operates to drive the outlet of the blanking pipe main body to respectively face the recycling hopper and the slurry tank hopper to discharge.

Preferably, the pulping system comprises two limestone slurry tanks, a recirculation hopper and two slurry tank hoppers are arranged in the blanking hopper, and discharge ports of the two slurry tank hoppers are respectively communicated with the two limestone slurry tanks through pipelines.

Preferably, the bottom of the limestone silo is provided with a motor vibrating feeder, and a discharge port of the motor vibrating feeder is positioned above the starting end of the belt feeder.

Preferably, an air cannon for preventing discharge blockage is arranged at the discharge outlet of the limestone silo.

Preferably, the pulping system further comprises a limestone slurry pump, and the limestone slurry pump is arranged on a liquid outlet pipeline of the recirculation tank.

Preferably, the belt feeder is a weighing belt feeder.

Preferably, the pulping system comprises three sets of limestone preparation subsystems.

Preferably, the pulping system comprises two limestone slurry tanks.

The purpose of the invention can be realized by the following technical scheme:

compared with the prior art, the invention has the following advantages:

(1) the slurry distribution device is arranged, so that the effective distribution of the overflow of the cyclone to the recirculation tank and the limestone slurry tank is realized, the distribution path is selected based on the overflow density, and when the limestone preparation system fails, the prepared limestone slurry is unqualified, the wet ball mill does not operate and other working conditions, the unqualified limestone slurry is prevented from entering the limestone slurry tank, and the quality of the limestone slurry is ensured;

(2) the bottom flow of the limestone cyclone can return to a limestone wet grinding machine for grinding again, the overflow is qualified limestone slurry, the slurry is selected to enter a recirculation box slurry pump through a limestone slurry distributor for pumping circulation or enter different limestone slurry storage systems, the production quality and the production stability of the limestone slurry are improved, the subsequent desulfurization effect of wet flue gas desulfurization is ensured, and the slurry deposition blockage in the systems and pipelines is avoided;

(3) according to the invention, a plurality of sets of limestone preparation subsystems and a plurality of limestone slurry tanks are arranged, the yield and the slurry fineness can be flexibly adjusted, a plurality of sets of equipment are mutually standby, the reliability of the slurry preparation system is improved, and the difficulty and the cost of maintenance of the equipment are reduced.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention;

FIG. 2 is a side view of the system of the present invention;

FIG. 3 is a cross-sectional view of the system of the present invention;

fig. 4 is a schematic structural view of the slurry distribution device of the present invention.

The system comprises a limestone silo 1, a limestone silo 2, a belt feeder 3, a wet ball mill 4, a recycling box 5, a limestone cyclone 6, a slurry distribution device 7, a limestone slurry box 8, a limestone slurry pump 9, an air cannon 10, a motor vibrating feeder 11, a densimeter 12, an electric push rod 13, a blanking pipe main body 14, a blanking hopper 15, a recycling hopper 16 and a slurry box hopper.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.

Examples

A wet limestone pulping system based on density distribution, as shown in fig. 1 to 3, includes multiple sets of limestone preparation subsystems and multiple limestone slurry tanks 7, and in this embodiment, three sets of limestone preparation subsystems and two limestone slurry tanks 7 are provided to meet the preparation demand and storage demand of limestone slurry.

In this embodiment, the limestone preparation subsystem includes a limestone silo 1, a belt feeder 2, a wet ball mill 3, a recirculation tank 4, a limestone slurry pump 8, a limestone cyclone 5 and a slurry distribution device 6, and the connection arrangement relationship is as follows:

the discharge gate of lime stone silo 1 locates belt feeder 2's initiating terminal top, the feed inlet of wet ball mill 3 locates belt feeder 2's terminal below wet ball mill 3's liquid outlet and the inlet of recirculation case 4 intercommunication, the liquid outlet of recirculation case 4 and the inlet of lime stone swirler 5 intercommunication, lime stone thick liquid pump 8 locates on the liquid outlet pipeline of recirculation case 4, the overflow mouth and the import of thick liquid distributor 6 of lime stone swirler 5 communicate, the export of thick liquid distributor 6 respectively with recirculation case 4, the import of lime stone thick liquid case 7 communicates, the underflow mouth of lime stone swirler 5 communicates through the inlet of pipeline and recirculation case 4.

In addition, in order to improve the limestone conveying efficiency and ensure quantitative conveying of limestone, an air cannon 9 for preventing discharge blockage is arranged at the discharge outlet of the limestone silo 1, a motor vibrating feeder 10 is arranged at the bottom of the limestone silo 1, the discharge outlet of the motor vibrating feeder 10 is positioned above the starting end of the belt feeder 2, and the belt feeder 2 is a weighing belt feeder 2.

In the invention, the discharge of the overflow port of the limestone cyclone 5 is sorted by the slurry distribution device 6, if the density meets the requirement of limestone slurry, the discharge is sent to the limestone slurry tank 7, otherwise, the discharge is sent to the recycle tank 4 for circulation, thereby avoiding the deposition of slurry in a system and a pipeline, ensuring that unqualified limestone slurry cannot enter the limestone slurry tank 7, specifically,

as shown in fig. 1 and 4, the slurry distributing device 6 includes a densimeter 11, an adjustable blanking pipe and a blanking hopper 14, the densimeter 11 is disposed on a pipeline between an overflow port of the limestone cyclone 5 and the slurry distributing device 6, a recirculation hopper 15 and two slurry tank hoppers 16 are disposed in the blanking hopper 14, a discharge port of the recirculation hopper 15 is communicated with an inlet of the recirculation tank 4 through a pipeline, discharge ports of the two slurry tank hoppers 16 are respectively communicated with the two limestone slurry tanks 7 through pipelines, a feed port of the adjustable blanking pipe is communicated with the overflow port of the limestone cyclone 5 through a pipeline, the adjustable blanking pipe includes an electric push rod 12 and a blanking pipe main body 13, the electric push rod 12 is disposed on a side surface of the blanking pipe main body 13, a tail end of the electric push rod 12 is connected with an outlet of the blanking pipe main body 13, a discharge port of the adjustable blanking pipe is disposed in the blanking hopper 14, the electric push rod 12 operates to drive an outlet of the blanking pipe main body 13 to respectively face the recirculation hopper 15, The slurry tank hopper 16 discharges.

When the invention is used, a limestone raw material in a limestone silo 1 is sent into a wet ball mill 3 for grinding through a belt feeder 2, limestone slurry is sent into a recirculation box 4 through an overflow port of the wet ball mill 3, slurry in the recirculation box 4 is pumped into a limestone cyclone 5 for sorting through a limestone slurry pump 8, the overflow of the limestone cyclone 5 enters a slurry distribution device 6, a densimeter 11 detects the overflow density, if the overflow density is qualified, an electric push rod 12 operates to enable a discharge port of a blanking pipe main body 13 to face a slurry box hopper 16, and the slurry entering the blanking pipe main body 13 enters a limestone slurry box 7; when the limestone preparation system fails, limestone slurry is unqualified, the wet ball mill 3 does not operate and other working conditions, the densimeter 11 detects that the overflow density of the limestone cyclone 5 is unqualified, the electric push rod 12 operates to enable the discharge hole of the blanking pipe main body 13 to face the recirculation hopper 15, slurry returns to the recirculation tank 4, and circulation of slurry in the system and the pipeline is ensured, so that slurry deposition in the system and the pipeline is avoided, and unqualified limestone slurry cannot enter the limestone slurry tank 7.

In this embodiment, in order to ensure the separation effect of the limestone cyclone 5, the slurry fed into the limestone cyclone 5 should be kept in a predetermined density range, and the slurry pressure should be kept in a proper range, wherein the slurry pressure is provided by the limestone slurry pump 8, an inlet of the limestone cyclone 5 is provided with an adjusting valve, and the slurry pressure can be adjusted by the opening degree of the adjusting valve and the number of the cyclone in the limestone cyclone 5, so as to ensure that the pressure is maintained in a proper range. Slurry density is maintained in a constant density range by closed loop control of the flow of process water to the recirculation tank 4.

The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.