CN203640759U - Water-saving resistance-reducing spraying device for mine exhaust heat recovery - Google Patents

Abstract

The utility model belongs to the technical field of mine exhaust heat energy recovery, in particular relates to a water-saving resistance-reducing spraying device for mine exhaust heat recovery, mainly aims to solve the problem that the conventional spraying device for the mine exhaust heat recovery has larger water loss and resistance loss, and provides the water-energy resistance-reducing spraying device for the mine exhaust heat recovery. The water-saving resistance-reducing spraying device for the mine exhaust heat recovery mainly comprises the spraying device with optimized diffusion tower section air speed ua, installation height H, water drop diameter d and water drop initial speed ud0. The four parameters of ua, H, d and ud0 are optimized by utilizing the Newton's second law and numerical simulation software; by the optimized device, the droplets can be ensured to fall into a water collection pool without being blown away; the water loss is reduced by over 90 percent; a water baffle is not required to be arranged; the resistance loss of the water baffle can be directly reduced by 195 Pa.

Description

Resistance spray equipment falls in a kind of water saving of mine for air exhaustion heat utilization

Technical field

The utility model belongs to mine for air exhaustion energy recovery technical field, and resistance spray equipment falls in the water saving that is specifically related to a kind of mine for air exhaustion heat utilization.

Background technology

Mine for air exhaustion heat utilization spray equipment sprays cold water downwards and reclaims air draft heat energy, and because air velocity in retention tower is high, spray facility height placement is improper, and drop particle diameter is chosen improper, causes a large amount of wind water losses.In addition, when water droplet is taken out of retention tower, need extra air thrust, cause air resistance to increase.Therefore must be optimized design to mine for air exhaustion heat utilization spray equipment, change retention tower sectional wind velocity, reasonable Arrangement spray equipment height, chooses suitable drop particle diameter, reduces mine for air exhaustion heat-energy recovering apparatus water loss and drag losses.

Mine for air exhaustion heat utilization spray equipment mainly comprises retention tower, nozzle, pipe row and watertight shutter, mine for air exhaustion heat utilization spray equipment is generally spray or contrary spray at present, pipe row and arrangement of nozzles are in retention tower inner tip, downwards the shower water of ejection due to face velocity excessive and cannot arrive bottom of device then by distinguished and admirable band upwards to watertight shutter, by watertight shutter, water is removed, but because wind speed is large, water droplet collides the reasons such as broken atomization, still have a large amount of water droplets to be taken away by distinguished and admirable, and watertight shutter resistance is large, add in water droplet uphill process that water droplet is to the distinguished and admirable additional friction causing, cause device fluid loss large, drag losses is large, heat energy recovery rate is low.

Summary of the invention

The purpose of this utility model is for the above-mentioned defect existing in prior art, provides a kind of water saving of follow-on mine for air exhaustion heat utilization to fall resistance spray equipment.The parameter of mine for air exhaustion heat utilization spray equipment of the present utility model, through optimizing, has reduced water loss and drag losses, has improved mine for air exhaustion heat reclamation device energy recovery efficiency.

The purpose of this utility model realizes by the following technical solutions: resistance spray equipment falls in the water saving of this mine for air exhaustion heat utilization, it comprises pipe row and the nozzle of the retention tower inner tip that is installed on mine return air lane, retention tower bottom is provided with collecting-tank, collecting-tank is connected with sedimentation basin, hydrotreater successively, the delivery port of hydrotreater is connected with the heat exchange water water inlet of source pump, and the heat exchange water delivery port of source pump is connected with described pipe row; The delivery port of source pump connects respectively pit shaft antifreezing water pipe, bath hot water pipe and air-conditioning water pipe, and described publilc baths used heat water pipe is also connected with the water inlet of sedimentation basin; Be characterized in: it does not comprise the watertight shutter being installed on pipe row and nozzle; Ensureing that water droplet is not broken, do not blow fly, do not suspend and air and the sufficient situation of water droplet interchange of heat under, described nozzle is less than nozzle at the limit setting height(from bottom) H of retention tower inner tip and sprays the maximum height of drop S of water droplet:

$\begin{array}{c}S=315.6\&CenterDot;d\&CenterDot;\mathrm{Ld}\left(\frac{{1.584u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}^2+{3.168u}_a\&CenterDot;u_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{1.584u}_a^2-9788d}{{1.584u}_a^2-9788d}\right)+\frac{d\&CenterDot;u_a\&CenterDot;u_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}}{0.001584u_a^2-9.788d}\\ -4.01u_a\&CenterDot;\sqrt{d}\&CenterDot;\mathrm{Ld}(\frac{{3.168u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{3.168u}_a-\sqrt{0.062d}}{{3.168u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{3.168u}_a+\sqrt{0.062d}}\&CenterDot;\frac{3.16{8u}_a+249\sqrt{d}}{{3.168u}_a-249\sqrt{d}})\end{array},$

Wherein, u _afor retention tower sectional wind velocity, d is drop particle diameter, u _d0for water droplet initial velocity.

Further preferred version, the structure of described spray equipment need make particle diameter d and the water droplet initial velocity u of its spray water droplet _d0meet following relational expression: d (u _a+ u _d0) ²≤ 33.79; Meanwhile, drop particle diameter also needs to meet:

The water saving of the mine for air exhaustion heat utilization after the utility model optimization is fallen resistance spray equipment inner nozzle and is arranged height, drop particle diameter and water droplet initial velocity are through calculating, ensure to fall into bottom of device after water droplet and the abundant heat exchange of air and do not blown and fly, therefore can remove watertight shutter, greatly degree reduced water loss and drag losses.

Principle of the present utility model is as follows:

The utility model device need to be optimized retention tower sectional wind velocity u _a, water droplet initial velocity u _d0, the parameter such as the maximum height of drop S of drop particle diameter d, nozzle limit setting height(from bottom) H, water droplet.According to processing air force difference, mine for air exhaustion heat utilization spray equipment has different physical dimensions and different u _a, therefore for the mine for air exhaustion heat-energy recovering apparatus of each size, can design a kind of water saving of mine for air exhaustion heat utilization and fall resistance spray equipment.

Implementation process of the present utility model is according to retention tower sectional wind velocity u _a, drop particle diameter d and water droplet initial velocity u _d0, ensureing that water droplet is not broken, not blowing fly, do not suspend in the situation that, determine the maximum height of drop S of water droplet, and ensure that it is greater than nozzle limit setting height(from bottom) H.If at given sectional wind velocity u _alower water droplet cannot fall into bottom of device, also should optimize retention tower size to reduce sectional wind velocity.Utilize Newton's second law, numerical simulation means are to u _a, u _d0, d, tetra-parameters of H are optimized respectively, and specific design method is as follows:

(1) according to retention tower sectional wind velocity u _a, suppose drop particle diameter d and water droplet initial velocity u _d0, water droplet is carried out to force analysis, draw four kinds of motion states that water droplet may experience:

1. the first situation, water droplet initial acceleration is downward, and water droplet acceleration diminishes gradually and speed increases gradually, and resistance increases along with the increase of speed, and in the time that resistance and buoyancy sum equal gravity, water droplet speed stops increasing and remains a constant speed and falls to system bottom.

2. the second situation, water droplet initial acceleration direction upwards and gradually reduces, and water droplet does retarded motion, relative velocity and resistance reduce thereupon, if the absolute velocity of water droplet was kept to before zero, water droplet stress balance, water droplet keeps this speed uniform motion to bottom of device.

3. the third situation, upwards, in the time that the absolute velocity of water droplet is kept to zero, resistance and buoyancy sum are still greater than gravity to water droplet initial acceleration, and nozzle setting height(from bottom) is a variable undetermined, if this highly reaches a certain threshold, water droplet will be blown to fly.

4. the 4th kind of situation, upwards, in the time that the absolute velocity of water droplet is kept to zero, resistance and buoyancy sum equal gravity to water droplet initial acceleration, and nozzle setting height(from bottom) is a variable undetermined, and water droplet will be suspended in device.

(2) the maximum height of drop S of drop computational methods are as follows:

Stress balance equation in drop vertical direction can be calculated by formula (1):

$\frac{{\mathrm{du}}_z}{\mathrm{dt}}=g\left(\frac{{\mathrm{\&rho;}}_d-{\mathrm{\&rho;}}_a}{{\mathrm{\&rho;}}_d}\right)-\frac{{\mathrm{\&rho;}}_a{u}_z^2{C}_{d}A}{2m_d}---\left(1\right)$

In formula (1), C _dfor resistance coefficient, get 0.44(and know together secondary rainbow, the theoretical and experimental study of cooling tower without filling material, Shanghai: Shanghai Communications University's doctorate paper,, PP28-28 in 2008), u _zfor vertical velocity component (relative velocity), its value equals u _a+ u _d, u _dfor water droplet absolute velocity, A is water droplet surface area, m _dfor water droplet quality, t is the flight time, ρ _dfor water droplet density, ρ _afor atmospheric density.

The first situation, under original state, gravity is greater than buoyancy and resistance sum, and water droplet can fall into system bottom.?

bring data into and obtain the relation between water droplet relative velocity and particle diameter: d>0.00016183 (u _a+ u _d0) ², the drop that meets this relational expression can fall into system bottom.Now S is for just infinite.

In the second situation, need to consider the impact of air face velocity, be at air face velocity that retention tower sectional wind velocity equals 3,5,8,10 respectively, water droplet carried out to force analysis 12m/s in the situation that, investigate absolute velocity u before water droplet stress balance _dwhether reduce to 0, relative velocity u while being also water droplet stress balance _a+ u _dwhether be greater than wind speed u _aif water droplet absolute velocity is not reduced to water droplet before 0 and reached stress balance, water droplet keeps this speed uniform descent, and in this case, S is unrestricted for water droplet height of drop.Make water droplet stress balance, relative velocity when substitution data obtain water droplet stress balance is

make it be greater than respectively wind speed 3,5,8,10,12m/s, obtain water droplet under various wind speed and do not blown the cut off diameter flying, as shown in table 1.

Table 1 air wind speed and cut off diameter (drop initial acceleration upwards)

As table 1, the water droplet cut off diameter that in the second situation, wind speed is corresponding is larger, and in the time that wind speed equals 5m/s, cut off diameter has reached 4.405mm, and in the first situation, in the time that relative velocity equals 5m/s, drop particle diameter is greater than 4mm equally.Because water droplet distortion is broken, the reasons such as low surface area volume ratio, generally can not select so large particle diameter in engineering application, and therefore, in considered scope of design, the first situation and the second situation there will not be.

For the third situation, by u _abe used as constant, use variable u _zreplace variable t, the limit of integration becomes u from 0 → t _a→ (u _a+ u _d0), obtain formula (2):

$S={\&Integral;}_0^t(u_z-u_a)\mathrm{dt}={\&Integral;}_{u_a+u_{d0}}^{u_a}\frac{{\mathrm{\&rho;}}_d\&CenterDot;{2m}_d\&CenterDot;(u_z-u_a)}{2m_d\&CenterDot;({\mathrm{\&rho;}}_d-{\mathrm{\&rho;}}_a)\&CenterDot;g-{\mathrm{\&rho;}}_d\&CenterDot;{\mathrm{\&rho;}}_a\&CenterDot;u_z^2\&CenterDot;C_d\&CenterDot;A}{\mathrm{du}}_z---\left(2\right)$

In formula (2), use variable u _dreplace variable u _zand integration obtains the maximum height of drop S of water droplet:

$\begin{array}{c}S=315.6\&CenterDot;d\&CenterDot;\mathrm{Ld}\left(\frac{{1.584u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}^2+{3.168u}_a\&CenterDot;u_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{1.584u}_a^2-9788d}{{1.584u}_a^2-9788d}\right)+\frac{d\&CenterDot;u_a\&CenterDot;u_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}}{0.001584u_a^2-9.788d}\\ -4.01u_a\&CenterDot;\sqrt{d}\&CenterDot;\mathrm{Ld}(\frac{{3.168u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{3.168u}_a-\sqrt{0.062d}}{{3.168u}_{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="DEST\_PATH\_HDA0000492125840000022.png,DEST\_PATH\_HDA0000492125840000031.png"\; state="\{\{state\}\}">d</figure-callout>}0}+{3.168u}_a+\sqrt{0.062d}}\&CenterDot;\frac{3.16{8u}_a+249\sqrt{d}}{{3.168u}_a-249\sqrt{d}})\end{array},$

The 4th kind of situation, when water droplet stress balance, absolute velocity is just kept to zero, and at this moment relative velocity equals u _a, according to stress balance relational expression, only have drop particle diameter to meet

water droplet just can suspend, the maximum height S that now water droplet can fall is identical with the third situation.

(3) determine nozzle limit setting height(from bottom) H, and optimize d, u _d0, u _aand H.

The first and the second situation there will not be, and for the third situation, need to make nozzle limit setting height(from bottom) H < S, need to ensure that water droplet is not broken simultaneously, relation between resistance and the surface tension being subject to according to water droplet, drop particle diameter and relative velocity should meet following relational expression: d (u _a+ u _d0) ²≤ 33.79, also to avoid water drop suspension simultaneously, drop particle diameter and face velocity also need to meet: for given retention tower, u _afor definite value, utilize numerical simulation instrument to draw different u _athe maximum height of drop of lower water droplet, is shown in Fig. 3 to Fig. 7, and according to ensureing not broken condition and avoid floating condition to d and u of water droplet _d0be optimized, select rational particle diameter and drop initial velocity.

If maximum height of drop S is very little for the drop calculating, should increase retention tower cross-sectional area, optimize retention tower size, make face velocity u _areduce and recalculate the maximum height of drop of water droplet, making S be greater than nozzle limit setting height(from bottom) H.

Brief description of the drawings

Fig. 1 is existing mine for air exhaustion heat utilization spray equipment theory structure schematic diagram.

Fig. 2 is that resistance spray equipment theory structure schematic diagram falls in the water saving of the mine for air exhaustion heat utilization of the utility model embodiment.

Fig. 3 is the maximum height of drop of water droplet, water droplet initial velocity and drop particle diameter graph of relation (retention tower sectional wind velocity is 3m/s).

Fig. 4 is the maximum height of drop of water droplet, water droplet initial velocity and drop particle diameter graph of relation (retention tower sectional wind velocity is 5m/s).

Fig. 5 is the maximum height of drop of water droplet, water droplet initial velocity and drop particle diameter graph of relation (retention tower sectional wind velocity is 8m/s).

Fig. 6 is the maximum height of drop of water droplet, water droplet initial velocity and drop particle diameter graph of relation (retention tower sectional wind velocity is 10m/s).

Fig. 7 is the maximum height of drop of water droplet, water droplet initial velocity and drop particle diameter graph of relation (retention tower sectional wind velocity is 12m/s).

Detailed description of the invention

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Referring to Fig. 1, it is the theory structure schematic diagram of existing mine for air exhaustion heat utilization spray equipment.In Fig. 1, the 1st, main fan, the 2nd, collecting-tank, the 3rd, sedimentation basin, the 4th, hydrotreater, the 5th, source pump, the 6th, pipe row and nozzle, the 7th, watertight shutter, the 8th, retention tower, a interface connects pit shaft antifreezing water pipe, b interface connects bath hot water pipe, c interface connects air-conditioning water pipe, and d interface connects publilc baths used heat water pipe, and e interface connects blowdown apparatus.H is nozzle limit setting height(from bottom), and S is the maximum height of drop of water droplet, u _athat retention tower sectional wind velocity is air face velocity, u _d0it is water droplet initial velocity.As can be seen from Fig. 1, spray facility is arranged in retention tower top, and water droplet is by initial velocity u _d0ejection downwards, be subject to doing and subtracting acceleration movement after distinguished and admirable resistance, after water droplet speed is kept to zero, continue to move upward, the maximum height of drop S < H of water droplet, because distinguished and admirable water content is large, discharge air flow still has quite a few water droplet to be blown and flies after watertight shutter is processed.If nozzle setting height(from bottom) is less than the maximum height of drop of water droplet, water droplet can flow in collecting-tank and not blown and fly, and is not blown and flies as sprayed the water droplet of facility right end portion nozzle ejection in Fig. 1.

Below the parameter of Fig. 1 shown device is optimized, first measures vertical plane air face velocity u _a, suppose one group of size droplet diameter d and drop initial velocity u _d0, by situation four and not broken condition of drop, the value of this group hypothesis must meet

d (u _a+ u _d0) ²≤ 33.79, then according to the formula that calculates the maximum height of drop S of drop in situation three, calculate S, if the value of S is too little, air and water droplet interchange of heat are insufficient, should expand retention tower basal area, reduce u _avalue, and according to new u _abe worth tentative calculation again, until obtain rational device parameter.Fig. 2 is the principle of device structural representation after the utility model is optimized on Fig. 1 shown device basis, and as can be seen from Fig. 2, the device after optimization does not comprise the watertight shutter 7 being installed on pipe row and nozzle; Meanwhile, it is large that the device retention tower basal area after optimizing becomes, u _adiminish, drop particle diameter d and initial velocity u thereof _d0range of choice larger.Parameters u after optimization _d0and d makes water droplet Maximum Descent Height S be greater than the limit setting height(from bottom) H of nozzle, ensure that water droplet falls in collecting-tank, has reduced water loss.Than original device, new equipment does not have watertight shutter, has reduced the drag losses of device.

Concrete engineering experiment embodiment below:

Retention tower height is 5.5m, and retention tower face velocity 5m/s supposes that arrangement of nozzles height is 3m, and in order to reduce water loss, the maximum height of drop of water droplet should be greater than 3m.According to the data of table 1, now suppose drop particle diameter 1.462mm, the according to circumstances formula of the calculating water droplet Maximum Descent Height in three, the maximum height of drop of this particle diameter under different wind speed and different initial water droplet speed is as shown in table 2.

Maximum height of drop S(particle diameter 1.462mm under the different wind speed of table 2 and water droplet initial velocity)

Suppose again u _d0value, make it meet not broken condition and avoid floating condition:

d (u _a+ u _d0) ²≤ 33.79, making drop initial velocity is 9.831m/s, three formula that provide or according to Fig. 4, calculating drop Maximum Descent Height S is 3.03m according to circumstances.The data of comparison sheet 2, meet the requirement of maximum height of drop, and can determine arrangement of nozzles height is 3.00m, can ensure that water droplet is not blown to fly.

Thus drop particle diameter, water droplet initial velocity and nozzle limit setting height(from bottom) are optimized, device after optimizing is compared with original device, water loss has reduced more than 90%, drag losses has reduced 195Pa(hypothesis original device and has adopted 4 folding watertight shutters, resistance coefficient ξ=13, pipe row is arranged in retention tower inner tip, and dash efficiency is 44%).

Claims (1)

1. resistance spray equipment falls in the water saving of a mine for air exhaustion heat utilization, it comprises pipe row and the nozzle of the retention tower inner tip that is installed on mine return air lane, retention tower bottom is provided with collecting-tank, collecting-tank is connected with sedimentation basin, hydrotreater successively, the delivery port of hydrotreater is connected with the heat exchange water water inlet of source pump, and the heat exchange water delivery port of source pump is connected with described pipe row; The delivery port of source pump connects respectively pit shaft antifreezing water pipe, bath hot water pipe and air-conditioning water pipe, and publilc baths used heat water pipe is also connected with the water inlet of sedimentation basin; It is characterized in that: it does not comprise the watertight shutter being installed on pipe row and nozzle; Ensureing that water droplet is not broken, do not blow fly, do not suspend and air and the sufficient situation of water droplet interchange of heat under, described nozzle is less than nozzle at the limit setting height(from bottom) H of retention tower inner tip and sprays the maximum height of drop S of water droplet:

Wherein, u _afor retention tower sectional wind velocity, d is drop particle diameter, u _d0for water droplet initial velocity.

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