CN201043946Y

CN201043946Y - Liquid-solid flow state floating and sinking device for coal

Info

Publication number: CN201043946Y
Application number: CNU2007200902650U
Authority: CN
Inventors: 焦红光; 聂其英; 铁占续; 郭小电
Original assignee: Henan University of Technology
Current assignee: Henan University of Technology
Priority date: 2007-05-08
Filing date: 2007-05-08
Publication date: 2008-04-02
Anticipated expiration: 2017-05-08

Abstract

The utility model discloses a fluid and solid fluidized float-and-sink device used for coal, comprising a vortex tube, a lower valve, an upper valve, a work screen, a fluidized bed, an overflow mouth, an overflow trough, a pressure port, and a tangential water supply pipe. The fluidized bed is fixed on the upper part of the vortex tube in dead joint; the tangential water supply pipe is arranged on one side of the vortex tube. The two sides of the fluidized bed are respectively fixed with the lower valve, the upper valve, and a series of pressure port. The internal part of the bottom of the fluidized bed is provided with a work screen, with an overflow trough positioned on the top and an overflow mouth positioned on the sidewall of the fluidized bed. Without disposition of dense liquid, composition and density of coal can be rapidly measured. The utility model is characterized in convenient operation, time and energy saving.

Description

Coal liquid-solid fluidization floating device

Technical field:

The utility model relates to a kind of coal liquid-solid fluidization floating device that coal density is formed situation that is used to measure.

Background technology:

For a long time, dense-medium separation is treatment capacity maximum, most economical coal preparation method all the time, and its main sorting is according to being the density difference between combustible and the non-combustible in the coal, and therefore, the density composition situation of coal is the Back ground Information that gravity concentration is paid close attention to most.Form by the density of measuring coal, can be familiar with raw coal character, estimate the coal resources situation; Select suitable sorting process and equipment; Determine theoretical separation index and control assorting room; Estimate separating effect etc.Current mensuration coal density is formed the method that generally adopts float-and-sink analysis, and the float-and-sink analysis of coal is divided into two kinds by coal sample size: a kind of is the float-and-sink analysis of granularity＞0.5mm coal sample; Another kind is the float-and-sink analysis of granularity＜0.5mm.The latter is called little float-and-sink analysis again, and the difference of the two is operating process and the used medicament difference of configuration heavy-fluid.Accurate as far as possible for the result who makes float-and-sink analysis, all be to drift along generally speaking with the narrow sized coal that sizing analysis obtains, the weight of float-and-sink analysis coal sample depends on the size of coal particle size fraction.The heavy-fluid that normally adopts zinc chloride and water configuration for the float-and-sink analysis of＞0.5mm coal sample is as separating medium, and according to Archimedes principle, density must float on the liquid level less than the coal of heavy-fluid density, becomes floating thing after pulling out; Density must be sunken to the heavy-fluid bottom greater than the coal of heavy-fluid density; And density just equal the coal of heavy-fluid will be at the heavy-fluid resuspension, both merging of back are referred to as hypostasis.According to the GB regulation, coal sample is pressed 1.3g/cm ³, 1.4g/cm ³, 1.5g/cm ³, 1.6g/cm ³, 1.7g/cm ³, 1.8g/cm ³, 2.0g/cm ³Be divided into the different densities level, can increase 1.25g/cm in case of necessity ³, 1.35g/cm ³, 1.45g/cm ³, 1.55g/cm ³, 1.9g/cm ³, 2.1g/cm ³Isodensity.Stone coal can suitably reduce and increase some density as the case may be.When carrying out float-and-sink analysis, at first in accordance with regulations or examination need configure the heavy-fluid of different densities, be respectively charged in the several vessels; The net bottom bucket that then will fill coal sample at first is immersed in the heavy-fluid of least density and goes, leave standstill up to layering after the stirring and finish, to float thing with strainer pulls out, proposing the net bottom bucket pulls hypostasis out, treat putting into the higher leveled heavy-fluid container of density again after heavy-fluid is taken off, so repeatedly, up to entering last the most highdensity heavy-fluid.Dry, weigh, calculate productive rate respectively and chemically examine ash content after subsequently the coal sample of each densimetric fraction being washed away zinc chloride with clear water, the density that obtains coal is at last formed situation.For a short time drift along because coal sample size is thin, and settling velocity is slow, therefore must in centrifugal force field, carry out,, generally adopt organic solution configuration heavy-fluids such as phenixin, benzene and bromoform for avoiding the shortcoming that solder(ing)acid viscosity is big, product cleaning is difficult.

The main disadvantage of float-and-sink analysis is: there are corrosivity in zinc chloride or other organic solvents of (1) configuration heavy-fluid, the people are known from experience produce harm, also might be with coal sample generation chemical reaction; (2) process of the test complexity, cost height, labour intensity is big and consuming time, and is especially for Bed for Fine Coal, because its settling velocity is slower, therefore consuming time longer.

The utility model content:

The purpose of this utility model provides and is not a kind ofly needing to dispose under the condition of heavy-fluid, easy and simple to handle, save time, laborsaving, can measure the coal liquid-solid fluidization floating device that coal density is formed situation.

To achieve these goals, the utility model comprises: vortex tube, lower valve, last valve, work sieve, fluidized bed, overflow vent, overflow groove, pressure tap, tangential feed pipe, fluidized bed is fixedly connected on the top of vortex tube, the side of vortex tube is provided with tangential feed pipe, the both sides of fluidized bed are set with lower valve respectively, go up a valve and a row pressure tap, fluidized bed lower end internal fixation is provided with a work sieve, the top of fluidized bed has fixedly installed an overflow groove, and the sidewall of overflow groove is set with overflow vent.

The internal upper part of described vortex tube has fixedly installed a current screen cloth.

Like this, when measuring coal density composition situation, at first tangential feed pipe is connected on the water pump, feeds current.Obtain the coal sample of a part of narrow particle size fraction by the method for sieving of routine, this part sample is put in the fluidized bed, increased water flow speed gradually then, at this moment solid material has just been realized by density stratification under the effect of ascending current, low-density particle is on the upper strata, and highdensity particle is in lower floor.Controlled water flow speed makes the top of fluidized bed bed be positioned at the highest piezometric tube following (at this moment also having the highdensity material of part still is trapped on the screen cloth), the pressure changing of observing piezometric tube to judge whether bed reaches steady state (SS) is treated to note first piezometric tube of upper end and the pressure reduction between the 4th piezometric tube of bottom after bed reaches steady state (SS).Next open to go up valve, treat that suspending liquid between the 4th piezometric tube of first piezometric tube of upper end and bottom emits the back fully and close and close valve, can obtain the quality of this part material weighing after the material filtering of emitting, the oven dry.Because the density of solid material is relevant with the interior solid concentration by volume of density, fluidized bed, the bed height of the pressure differential of fluidized bed bed top and bottom, fluid.Above-mentioned parameter substitution formula can be able to be obtained the density of this part coal sample, the density of considering water is 1.0g/cm ³, the relative density that calculates also is the absolute density of coal sample, unit is g/cm ³Continue to increase water velocity, make highdensity solid material enter fluidized state, repeat above-mentioned steps, obtain the density of each sample successively.When all solids particle all enters into fluidized state, measure the pressure reduction between upper end piezometric tube and the lower end piezometric tube, open lower valve at last last material is all emitted, calculate the proportion that can obtain high density thing according to the aforesaid operations step.

Have following advantage:

(1) because whole process need not any chemical agent, clean environmental protection and experimentation cost are cheap;

(2) test unit is simple, and floor area is little;

(3) saved to the transfer of the fishing for of floating thing, hypostasis and to the flushing operation of coal sample, the float-and-sink analysis of a plurality of particle size fractions can be carried out simultaneously, greatly reduces labour intensity, has shortened test period;

Description of drawings:

Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is a structural representation of the present utility model.

Embodiment:

As shown in Figure 1, the utility model comprises: vortex tube 2, lower valve 4, last valve 5, work sieve 6, fluidized bed 7, overflow vent 8, overflow groove 9, pressure tap 10, tangential feed pipe 11.The fluidized bed bottom is isometrical simplified section, and the upper end is horn-like diffuser, the isometrical section homogeneity that can guarantee current, and horn-like diffuser can prevent that water from flowing through senior general's coal grain and going out.Fluidized bed 7 is fixedly connected on the top of vortex tube 2, and the side of vortex tube 2 is provided with a tangential feed pipe 11, and the both sides of fluidized bed 7 are set with lower valve 4 respectively, go up a valve 5 and a row pressure tap 10, and pressure tap can be provided with 5-6.Fluidized bed 7 lower end internal fixation are provided with a work sieve 6, and the position of work sieve is lower than the position of lower valve, and the aperture of work sieve should be less than the granularity of narrow particle size fraction coal sample.The top of fluidized bed 7 has fixedly installed an overflow groove 9, and the sidewall of overflow groove 9 is set with overflow vent 8.In order to guarantee that vortex tube enters into the flow uniformity in the fluidized bed, the internal upper part of described vortex tube 2 has fixedly installed a current screen cloth 3.The lower end of vortex tube is provided with rubber plug 1, is used to test discharge water or secondary slime behind the superlative.Fluidized bed and vortex tube adopt transparent material to be processed into, and are convenient to people's experimental observation.

Claims

1. coal liquid-solid fluidization floating device, comprise: vortex tube (2), lower valve (4), last valve (5), work sieve (6), fluidized bed (7), overflow vent (8), overflow groove (9), pressure tap (10), tangential feed pipe (11), it is characterized in that fluidized bed 7 is fixedly connected on the top of vortex tube (2), the side of vortex tube (2) is provided with tangential feed pipe (11), the both sides of fluidized bed (7) are set with lower valve (4) respectively, a last valve (5) and a row pressure tap (10), fluidized bed (7) lower end internal fixation is provided with a work sieve (6), the top of fluidized bed (7) has fixedly installed an overflow groove (9), and the sidewall of overflow groove (9) is set with overflow vent (8).

2. coal liquid-solid fluidization floating device according to claim 1 is characterized in that the internal upper part of described vortex tube (2) has fixedly installed a current screen cloth (3).