CN211838431U

CN211838431U - Coal gasification ash gravity separation system

Info

Publication number: CN211838431U
Application number: CN202020281186.3U
Authority: CN
Inventors: 王书礼; 王磊; 王建; 刘佃彪; 王伟
Original assignee: Weihai Haiwang Technology Co ltd
Current assignee: Weihai Haiwang Technology Co ltd
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-11-03
Anticipated expiration: 2030-03-10

Abstract

The invention relates to the technical field of comprehensive utilization of coal gasification ash, in particular to a gravity separation system for coal gasification ash, the system consists of a stirrer, a stirring barrel, a slurry pump, a hydrocyclone, a fluidized bed separator, a distributing device and a vibrating fine screen, a stirrer is arranged in the stirring barrel, a water source inlet and a raw material inlet are respectively arranged on the stirring barrel, the discharge gate of agitator be linked together through the feed inlet of conveyer pipe with the sediment stuff pump, the discharge gate of sediment stuff pump is linked together through the feed inlet of conveyer pipe with hydrocyclone, hydrocyclone's underflow mouth is linked together through the feed inlet of conveyer pipe with fluidized bed sorter, fluidized bed sorter's overflow outlet is linked together through the feed inlet of conveyer pipe with the distributing device, the discharge gate of distributing device is linked together through the feed inlet of conveyer pipe with the vibration fine screen, have advantages such as simple structure, low cost, product index are good.

Description

Coal gasification ash gravity separation system

Technical Field

The invention relates to the technical field of comprehensive utilization of coal gasification ash, in particular to a coal gasification ash gravity separation system with simple structure, low cost and good product index.

Background

As is well known, the ash content, composition and gasification process of coal gasification ash are related to the ash content of gasification raw material coal, mainly SiO₂、Al₂O₃CaO and residual carbon, etc. With the increasing environmental protection pressure in recent years, the comprehensive utilization of the gasified slag as solid waste becomes an important factor for realizing the circular economy of the whole coal chemical engineering project. The ash is reasonably utilized, so that the harm of the ash can be eliminated, a large amount of material resources can be saved, and waste is turned into wealth, so that the research on the comprehensive utilization approach of the coal gasification ash and the development of a new comprehensive utilization technology of the ash have important practical significance.

At present, the available fixed carbon is recovered by a flotation mode in the resource utilization process of the coal gasification ash. Although the flotation process has good separation effect, the flotation process also has the problems of complex process, large investment, high operation cost, complex operation and the like. Therefore, the development of the coal gasification slag separation process with simple process and low cost becomes necessary.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the coal gasification ash gravity separation system with simple structure, low cost and good product index.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a coal gasification ash gravity separation system is characterized by comprising a stirrer, a stirring barrel, a slurry pump, a hydrocyclone, a fluidized bed separator, a distributor and a vibrating fine screen, wherein the stirrer is arranged in the stirring barrel, the stirring barrel is respectively provided with a water source inlet and a raw material inlet, a discharge port of the stirring barrel is communicated with a feed inlet of the slurry pump through a conveying pipe, a discharge port of the slurry pump is communicated with a feed inlet of the hydrocyclone through a conveying pipe, an overflow pipe of the hydrocyclone overflows a product A, the product A is a middlings sludge product, a underflow port of the hydrocyclone is communicated with a feed inlet of the fluidized bed separator through a conveying pipe, an underflow outlet of the fluidized bed separator flows a product B, the product B is a cement raw material, an overflow outlet of the fluidized bed separator is communicated with a feed inlet of the distributor through a conveying pipe, and a discharge port of the distributor is communicated with a feed inlet of the vibrating fine, the sun damage product of the vibration fine screen is a product C, the product C is a clean coal product, the undersize product of the vibration fine screen is a product D, and the product D is a middling product.

The mesh of the vibrating fine screen is 0.074-0.23mm, and the rotating speed of the vibrating motor is 750-1450 rpm.

The system consists of a stirrer, a stirring barrel, a slurry pump, a hydrocyclone, a fluidized bed separator, a distributing device and a vibrating fine screen, wherein the stirrer is arranged in the stirring barrel, the stirring barrel is respectively provided with a water source inlet and a raw material inlet, a discharge port of the stirring barrel is communicated with a feed inlet of the slurry pump through a conveying pipe, a discharge port of the slurry pump is communicated with a feed inlet of the hydrocyclone through a conveying pipe, an overflow pipe of the hydrocyclone overflows a product A, the product A is a medium coal slime product, a underflow port of the hydrocyclone is communicated with a feed inlet of the fluidized bed separator through a conveying pipe, a underflow outlet of the fluidized bed separator flows a product B, the product B is a cement raw material, an overflow outlet of the fluidized bed separator is communicated with a feed inlet of the distributing device through a conveying pipe, and a discharge port of the distributing device is communicated with a feed inlet of, the sun damage product of the vibration fine screen is a product C, the product C is a clean coal product, the undersize product of the vibration fine screen is a product D, and the product D is a middling coal product.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in the attached drawing, the coal gasification ash gravity separation system is characterized by comprising a stirrer 1, a stirring barrel 2, a slurry pump 3, a hydrocyclone 4, a fluidized bed separator 5, a distributor 6 and a vibrating fine screen 7, wherein the stirrer 1 is arranged in the stirring barrel 2, the stirring barrel 2 is respectively provided with a water source inlet and a raw material inlet, a discharge port of the stirring barrel 2 is communicated with a feed inlet of the slurry pump 3 through a conveying pipe, a discharge port of the slurry pump 3 is communicated with a feed inlet of the hydrocyclone 4 through the conveying pipe, an overflow pipe of the hydrocyclone 4 overflows a product A, the product A is a middling coal slurry product, a bottom flow port of the hydrocyclone 4 is communicated with a feed inlet of the fluidized bed separator 5 through the conveying pipe, a bottom flow outlet of the fluidized bed separator 5 flows a product B, the product B is a cement raw material, an overflow outlet of the separator 5 is communicated with a feed inlet of the distributor 6 through the conveying pipe, the discharge gate of distributing device 6 is linked together through conveyer pipe and the feed inlet of vibration fine screen 7, and the sunburn result of vibration fine screen 7 is product C, and product C is the clean coal product, and the product under the screen of vibration fine screen 7 is product D, and product D is the middlings product, reselects the process steps as follows: (1) size mixing: the coal gasification slag solid and water respectively enter the stirring barrel 2 through a raw material inlet and a water source inlet of the stirring barrel 2, and then are subjected to size mixing through the stirrer 1 in the stirring barrel 2; (2) pre-grading: the prepared slurry in the step (1) is conveyed into a hydrocyclone 4 through a slurry pump 3, the hydrocyclone 4 grades the materials under the centrifugal grading effect, fine particles are discharged from the overflow of the hydrocyclone to form a product A, the product A is a middlings slurry product and can be directly sold or can enter the original flotation process flow for re-selection, and coarse particles are discharged from the underflow of the hydrocyclone 4; (3) sorting: the material discharged from the bottom flow of the hydrocyclone 4 in the step (2) enters a fluidized bed separator 5 through a conveying pipe, under the separation action of the fluidized bed separator 5, the high-density product is discharged from the bottom flow of the fluidized bed separator 5 to form a product B, the product B is a cement raw material and can be directly sold, and the low-density product enters a distributor 6 from the overflow of the fluidized bed separator 5 and is uniformly divided into multiple paths of ore pulp; (4) desliming and ash reduction: the ore pulp distributed by the distributor 6 in the step (3) is fed into a vibrating fine sieve 7 through a conveying pipe for desliming and ash reduction, the product under the sieve is high-ash fine mud as a product C, the product C is a medium coal product and can be directly sold or can be re-selected in a flotation process, the product on the sieve is a product D, the product D is a clean coal product and can be directly sold, the mass concentration of the prepared slurry in the step (1) is 20-40%, the classification particle size range of the hydrocyclone 4 in the step (2) is D95 between 45 and 120 mu m, the feeding concentration range of the fluidized bed separator 5 in the step (3) is 30-70%, the classification density range is 1.1-1.9g/cm, the mesh of the vibrating fine sieve 7 in the step (4) is 0.074-0.23mm, and the rotating speed of a vibrating motor 1450rpm is 750.

The following differences between conventional flotation equipment and processes and the equipment and processes of the present invention are shown in the following table:

as can be seen from the above table, the concentrate dewatering in the flotation of the transmission flotation process must use a filter press, while the ore dewatering of the invention can be carried out by using a centrifugal machine, the investment between the filter press and the centrifugal machine is very different, and the price of the flotation machine of the main selection equipment of the transmission flotation process is much higher than that of the FBS fluidized bed sorting machine in the invention.

According to the analysis from the indexes, the sorting effect of the flotation on the primary ash is very good, but the sorting effect table is very poor due to the fact that the surface physicochemical property of the ash particles accumulated all the year round is changed and the floatability is poor, and the effect of the invention on the primary ash and the ash accumulated all the year round is good.

In terms of social benefit, flotation causes the problem of wastewater pollution because of the addition of a large amount of chemical agents, but the method is not suitable for any chemical agent and is environment-friendly.

Claims

1. A coal gasification ash gravity separation system is characterized by comprising a stirrer, a stirring barrel, a slurry pump, a hydrocyclone, a fluidized bed separator, a distributor and a vibrating fine screen, wherein the stirrer is arranged in the stirring barrel, the stirring barrel is respectively provided with a water source inlet and a raw material inlet, a discharge port of the stirring barrel is communicated with a feed inlet of the slurry pump through a conveying pipe, a discharge port of the slurry pump is communicated with a feed inlet of the hydrocyclone through a conveying pipe, an overflow pipe of the hydrocyclone overflows a product A, the product A is a middlings sludge product, a underflow port of the hydrocyclone is communicated with a feed inlet of the fluidized bed separator through a conveying pipe, an underflow outlet of the fluidized bed separator flows a product B, the product B is a cement raw material, an overflow outlet of the fluidized bed separator is communicated with a feed inlet of the distributor through a conveying pipe, and a discharge port of the distributor is communicated with a feed inlet of the vibrating fine, the sun damage product of the vibration fine screen is a product C, the product C is a clean coal product, the undersize product of the vibration fine screen is a product D, and the product D is a middling product.

2. The coal gasification ash reselection system as claimed in claim 1, wherein the mesh of the vibrating fine screen is 0.074-0.23mm, and the rotating speed of the vibrating motor is 750-.