CN116907176A - Efficient cooling method and cooling system for quartz ore - Google Patents
Efficient cooling method and cooling system for quartz ore Download PDFInfo
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- CN116907176A CN116907176A CN202311056395.2A CN202311056395A CN116907176A CN 116907176 A CN116907176 A CN 116907176A CN 202311056395 A CN202311056395 A CN 202311056395A CN 116907176 A CN116907176 A CN 116907176A
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- purging
- purge
- ore
- positive pressure
- cooling
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- 238000001816 cooling Methods 0.000 title claims abstract description 64
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 239000010453 quartz Substances 0.000 title claims abstract description 47
- 238000010926 purge Methods 0.000 claims abstract description 82
- 239000000428 dust Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000009423 ventilation Methods 0.000 claims description 9
- 239000002918 waste heat Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a high-efficiency cooling method and a cooling system for quartz ores, comprising the following specific steps of: s1: step I, carrying out primary positive pressure purging on the roasted water quenched quartz ore from bottom to top, entering a step II when the temperature of purging gas after dust removal treatment is less than or equal to 300 ℃, otherwise, continuously carrying out the step I; s2: step II, carrying out secondary positive pressure purging on the quartz ore from bottom to top, entering a step III when the temperature of the purging gas after dust removal treatment is less than or equal to 200 ℃, otherwise, continuously carrying out the step II; s3: and step III, carrying out positive pressure purging on the quartz ore for three times from bottom to top, and continuously purging until the temperature of the quartz ore is lower than 40 ℃. The invention adopts the purge air to carry out positive pressure purge on the quartz ore, realizes gradient cooling, takes away free water and heat in ore gaps, and achieves the dual purposes of ore cooling and water removal.
Description
Technical Field
The invention belongs to the field of ore processing, and particularly relates to a high-efficiency cooling system and method for quartz ores.
Background
In the production process of the high-purity quartz sand, the quartz ore is required to be roasted, heated to 1100-1400 ℃, and then cooled and waiting. The existing quartz ore cooling method mainly comprises the following steps:
(1) And the air convection is enhanced by adopting open type room temperature natural cooling. However, the quartz ore roasting cooling waiting time of the cooling method is long, so that the production takt is inconsistent with the downstream process. And as the products are increased, the occupied area is large, and the production efficiency and unit investment cost are seriously affected. In addition, impurities are easy to introduce in the open cooling process, so that the difficulty in purifying subsequent products is increased;
(2) In patent document CN110145948A, the cooling efficiency of quartz ore is improved by increasing a cold source (condenser) and increasing the number of air convection (fan moisture) to lower the temperature of a cooling medium. However, the cooling scheme can reduce the temperature, but the cooling temperature gradient is too large, condensed water is easy to generate in the cooling process, so that the highest cooling efficiency cannot be achieved, negative effects, namely water residues, are caused, the crushed quartz powder is agglomerated, screening is difficult, a screen is damaged, equipment downtime is caused, and the production efficiency is seriously influenced.
(3) In the patent document CN218155195U, the ore is vertically turned over and dehumidified by the cold air flow, so that all positions of the outer surface of the ore can be fully dehumidified, the effect of dehumidifying a plurality of outer surfaces of the ore is achieved, and the ore dehumidifying effect is improved. However, the rotation of the mechanism in this cooling scheme causes friction between the ore and the metal surface, causing metal contamination of the ore. Meanwhile, the mechanism has less loading capacity and low production efficiency, and is easy to cause material crushing and leakage and dust, thereby reducing the product yield.
Object of the Invention
In order to solve the technical problems, the invention discloses a high-efficiency cooling method and a cooling system for quartz ores, which adopt purge air to carry out multi-stage positive pressure purge on the quartz ores, realize gradient cooling, and take away free water and heat in ore gaps, thereby achieving the dual purposes of ore cooling and water removal.
The specific technical scheme of the invention is as follows:
the efficient cooling method for the quartz ore comprises the following specific steps of:
s1: step I, carrying out primary positive pressure purging on the roasted water quenched quartz ore from bottom to top, entering a step II when the temperature of purging gas after dust removal treatment is less than or equal to 300 ℃, otherwise, continuously carrying out the step I;
s2: step II, carrying out secondary positive pressure purging on the quartz ore from bottom to top, entering a step III when the temperature of the purging gas after dust removal treatment is less than or equal to 200 ℃, otherwise, continuously carrying out the step II;
s3: and step III, carrying out positive pressure purging on the quartz ore for three times from bottom to top, and continuously purging until the temperature of the quartz ore is lower than 40 ℃.
Preferably, in the step S1, the pressure of the purge gas of the primary positive pressure purge is 0.3MPa, and the flow rate is 10-15m/S.
Preferably, in the step S2, the pressure of the purge gas of the secondary positive pressure purge is 0.4MPa, and the flow rate is 8-10m/S.
Preferably, in the step S3, the pressure of the three positive pressure purging is 0.05-0.6MPa, the flow rate is 5-8m/S, and the purging is continued until the temperature of the ore is lower than 40 ℃.
Preferably, in the stage I and the stage II, the purged gas is completely discharged through a discharge valve after dust removal treatment, and in the stage III, the purged gas is partially recycled and circularly supplied to the stage III for three times of positive pressure purging after dust removal treatment, so that return air preheating is realized.
Preferably, in the positive pressure purging process of the stage I, the stage II and the stage III, the gas collecting channel of the purge gas is continuously and periodically closed, and the purge pressure oscillation is formed to improve the free water separation efficiency.
The cooling system is characterized by comprising a cooling box, a gas collecting device, a dust remover and an air filtering fan, wherein the bottom of the cooling box is provided with a ventilation pore plate, and purge gas is branched from the bottom of the cooling box through the ventilation pore plate and then uniformly purges quartz ore upwards; the gas collecting device is positioned above the cooling box and is used for collecting the purge gas, and the collected purge gas is discharged or recovered after being treated by the dust remover; the air outlet of the air filtering fan is communicated with the bottom of the cooling box through a pipeline, the air inlet of the air filtering fan is divided into two branches, one branch is connected with the air outlet of the dust remover through a return air valve, and the other branch is used for communicating air.
Preferably, the dust remover also comprises a high-point discharge pipe, and the high-point discharge pipe is connected with the air outlet of the dust remover through an exhaust valve.
Preferably, in the stage III, the opening valve degree of the exhaust valve is controlled to be gradually adjusted to 10% from 100% in the process of utilizing the return air waste heat.
Preferably, the dust remover is a pulse dust remover, a valve plate of the pulse dust remover is periodically opened and closed in the purging and cooling process, the period is closed once every 5-30min, and the closing duration of the valve plate is 5-30s.
The beneficial effects are that: the invention discloses a high-efficiency cooling method and a cooling system for quartz ores, which have the following advantages:
(1) On one hand, the invention adopts a gradient cooling mode, so that the phenomenon that the water content in the ore remains due to condensate water generated by overlarge cooling temperature gradient is avoided; on the other hand, residual waste heat of return air is utilized to evaporate residual free water, so that the problems of condensate water residual ore and quartz sand agglomeration are solved, the downtime probability of crushing and screening procedures is reduced, and the production efficiency is improved.
(2) The invention uses the ventilation orifice plate to split the purging air, so that the purging air is fully purged on the quartz ore carrying free water and heat, and the purging air split by the ventilation orifice plate can pass through gaps among the quartz ore, thereby increasing the contact area of cooling medium, improving the cooling efficiency, having simple structure and convenient operation, and reducing the preparation time of maintenance and inspection.
(3) The invention utilizes the periodically opened and closed valve plate of the dust remover to cause the vibration of the sweeping pressure and provide slight kinetic energy to enable ore to vibrate slightly, thereby improving the separation efficiency of free water.
Drawings
FIG. 1 is a system configuration diagram of embodiment 1;
in the figure: the quartz ore transfer box 1, the gas collecting device 2, the pulse dust collector 3, the air filtering fan 4, the high-point discharge pipe 5, the exhaust valve 6, the return air valve 7, the ventilation pore plate 8 and the pipeline 9.
Detailed Description
The invention is further improved and modified in the following description with reference to the drawings, which are also to be regarded as protection.
Example 1
A cooling system for efficiently cooling quartz ore, as shown in figure 1, comprises a cooling box 1, a gas collecting device 2, a pulse dust collector 3, an air filtering fan 4 and a high-point discharge pipe 5, wherein,
the bottom of the cooling box 1 is provided with a ventilation pore plate 8, and the sweeping gas is upwards and uniformly swept quartz ore after being shunted from the bottom of the cooling box 1 through the ventilation pore plate 8.
The gas collecting device 2 is communicated with the pulse dust collector 3 through a pipeline 9, the gas collecting device 2 is positioned above an opening of the cooling box 1 and is used for collecting purge gas, the collected purge gas is discharged or recovered after being processed by the pulse dust collector 3, and a valve plate of the pulse dust collector 3 is periodically opened and closed in the whole purge cooling process; when the valve plate is closed, the pipeline 9 is closed, so that the purge gas is blocked, the purge gas generates purge pressure oscillation, and the free water separation efficiency is improved. In the invention, a position gap exists between the gas collecting device 2 and the opening of the cooling box 1, and the specific gap distance can be adjusted by a person skilled in the art according to actual requirements.
The air outlet of the air filtering fan 4 is communicated with the bottom of the cooling box 1 through a pipeline 9, the air inlet of the air filtering fan 4 is divided into two branches, one branch is connected with the air outlet of the pulse dust collector 3 through a return air valve 7, and the other branch is used for communicating air; the high-point discharge pipe 5 is connected with the air outlet of the pulse dust collector 3 through an air exhaust valve 6.
The efficient cooling method for the quartz ore comprises the following specific steps of:
s1: and (3) carrying out positive pressure purging on the roasted water quenched quartz ore from bottom to top, entering a stage II when the temperature of purging gas after dust removal treatment is less than or equal to 200 ℃, otherwise, continuously carrying out the stage I. In stage I, the quartz ore which has just undergone roasting and water quenching has a high temperature and a large water content, and therefore, a large amount of free water and high-temperature gas containing water on the surface of the quartz ore need to be rapidly discharged. Wherein the purge gas temperature is collected by a temperature sensor provided at the return air valve 7.
In this example, the purge gas pressure of the primary positive pressure purge was 0.3MPa, and the flow rate was 10-15m/s. And because the gas after purging has a large amount of moisture and the gas temperature is higher, the return air preheating recovery is not suitable, and the purging gas after dust removal treatment is directly discharged from the high-point discharge pipe 5 through the exhaust valve 6. When the pressure inside the liquid is greater, the molecules on the surface of the liquid need to overcome the greater pressure to enter the gas phase. I.e. the higher the internal pressure of the liquid, the slower the evaporation rate. Thus, during phase i, the return valve 7 of the cooling system is closed and the exhaust valve is 100% open, allowing a large amount of water vapor to be removed with the air by increasing the airflow power (flow rate) and discharging all of it from the high point discharge pipe 5.
S2: and (2) carrying out secondary positive pressure purging on the quartz ore from bottom to top, entering a stage III when the temperature of the purging gas after dust removal treatment is less than or equal to 100 ℃, otherwise, continuously carrying out the stage II.
In the process of the stage II, the pressure of the purge gas of the secondary positive pressure purge is 0.4MPa, and the flow rate is 8-10m/s. In the stage II process, a large amount of water still exists in the return air, the removal efficiency can be improved through direct discharge, and if the return air waste heat recovery is carried out in the present stage, a certain proportion of water still cannot be discharged in the system, so that the expected effect cannot be achieved. Therefore, in the stage II, no return air waste heat recovery is performed, and the purge gas after dust removal treatment is directly discharged from the high-point discharge pipe 5 through the exhaust valve 6. During stage II, by varying the pressure, moisture adhering to the quartz ore is made to enter the gas phase more easily. Thus, during phase ii, the return air valve 7 of the cooling system is closed and the exhaust air valve is 100% open.
S3: and step III, carrying out positive pressure purging on the quartz ore for three times from bottom to top, and continuously purging until the temperature of the quartz ore is lower than 40 ℃. In this example, the three positive pressure purges were carried out at a purge pressure of 0.05-0.6MPa and a flow rate of 5-8m/s, and continued until the ore temperature was below 40 ℃.
In the stage III, the water content of the purged gas is very low, so that the opening valve degree of the exhaust valve can be controlled to be gradually adjusted from 100% to 10%, the discharge amount of the purged gas is reduced, the return air valve is opened, the purge gas is recycled to the air filtering fan, the quartz ore is purged by three positive pressure, and the waste heat of the return air is fully utilized to take away free water in ore gaps. In stage III, by reducing the purge gas pressure, low temperature waste heat can be effectively utilized to evaporate moisture, thereby achieving waste heat utilization and being used for moisture evaporation removal.
In the embodiment, in the positive pressure purging process of the stage I, the stage II and the stage III, the valve plate of the pulse dust collector is continuously and periodically closed, the valve plate is normally closed once every 5-30min, the closing duration of the valve plate is 5-30s, and purging pressure oscillation is formed to improve the free water separation efficiency.
The foregoing is merely illustrative of the present invention and is a preferred embodiment thereof. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art and are intended to be within the scope of the present invention.
Claims (10)
1. The efficient cooling method for the quartz ore is characterized by comprising the following specific steps of:
s1: step I, carrying out primary positive pressure purging on the roasted water quenched quartz ore from bottom to top, entering a step II when the temperature of purging gas after dust removal treatment is less than or equal to 300 ℃, otherwise, continuously carrying out the step I;
s2: step II, carrying out secondary positive pressure purging on the quartz ore from bottom to top, entering a step III when the temperature of the purging gas after dust removal treatment is less than or equal to 200 ℃, otherwise, continuously carrying out the step II;
s3: and step III, carrying out positive pressure purging on the quartz ore for three times from bottom to top, and continuously purging until the temperature of the quartz ore is lower than 40 ℃.
2. The efficient cooling method for quartz ore according to claim 1, wherein in S1, the purge gas pressure of one positive pressure purge is 0.3MPa and the flow rate is 10-15m/S.
3. The efficient cooling method for quartz ore according to claim 1, wherein in S2, the purge gas pressure of the secondary positive pressure purge is 0.4MPa and the flow rate is 8-10m/S.
4. The efficient cooling method for quartz ore according to claim 1, wherein in S3, the purge pressure of the three positive pressure purges is 0.05-0.6MPa, the flow rate is 5-8m/S, and the purge is continued until the ore temperature is lower than 40 ℃.
5. The efficient cooling method for quartz ores according to any one of claims 1 to 4, wherein in the stage i and the stage ii, the purged gas is completely discharged through a discharge valve after dust removal treatment, and in the stage iii, the purged gas is partially recycled and circularly supplied to the stage iii for three times of positive pressure purging after dust removal treatment, thereby realizing return air preheating.
6. The method of any one of claims 1-4, wherein the purge pressure oscillations are formed by continuously and periodically closing the purge gas collection channels during the positive pressure purge of stage i, stage ii and stage iii to increase the free water removal efficiency.
7. A cooling system for implementing the method of any one of claims 1-6, which is characterized by comprising a cooling box, a gas collecting device, a dust remover and an air filtering fan, wherein a ventilation pore plate is arranged at the bottom of the cooling box, and a purging gas is branched from the bottom of the cooling box through the ventilation pore plate and then upwards and uniformly purges quartz ore; the gas collecting device is positioned above the cooling box and is used for collecting the purge gas, and the collected purge gas is discharged or recovered after being treated by the dust remover; the air outlet of the air filtering fan is communicated with the bottom of the cooling box through a pipeline, the air inlet of the air filtering fan is divided into two branches, one branch is connected with the air outlet of the dust remover through a return air valve, and the other branch is used for communicating air.
8. The cooling system of claim 7, further comprising a high point discharge pipe connected to the air outlet of the dust collector through an air discharge valve.
9. The cooling system of claim 7, wherein during stage iii, the opening valve control of the vent valve is gradually adjusted from 100% to 10% during return air waste heat utilization.
10. The cooling system of claim 7, wherein the dust collector is a pulse dust collector, and wherein a valve plate of the pulse dust collector is periodically opened and closed during the purge cooling process, and the period is closed once every 5-30min, and the valve plate closing duration is 5-30s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311056395.2A CN116907176A (en) | 2023-08-22 | 2023-08-22 | Efficient cooling method and cooling system for quartz ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311056395.2A CN116907176A (en) | 2023-08-22 | 2023-08-22 | Efficient cooling method and cooling system for quartz ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116907176A true CN116907176A (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311056395.2A Pending CN116907176A (en) | 2023-08-22 | 2023-08-22 | Efficient cooling method and cooling system for quartz ore |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116907176A (en) |
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2023
- 2023-08-22 CN CN202311056395.2A patent/CN116907176A/en active Pending
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