CN113650144A - By using non-pure CO2Device and method for curing cement prefabricated member - Google Patents
By using non-pure CO2Device and method for curing cement prefabricated member Download PDFInfo
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- CN113650144A CN113650144A CN202110842022.2A CN202110842022A CN113650144A CN 113650144 A CN113650144 A CN 113650144A CN 202110842022 A CN202110842022 A CN 202110842022A CN 113650144 A CN113650144 A CN 113650144A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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Abstract
The invention discloses a method for utilizing non-pure CO2The device comprises a gas storage tank, a pressure reducing valve, a vacuum pump, a reaction kettle, a pressure gauge, a temperature sensor and CO2Concentration detector, computer, and valve and trachea. Firstly, vacuumizing the reaction kettle, and then, introducing the non-pure CO in the gas storage tank2Introducing into the kettle, and timing when the pressure is preset. Timed detection of CO in kettle during curing2When the concentration is less than 10%, all the gas is discharged, and the carbonization reaction is carried out quickly and efficiently all the time by re-vacuumizing and ventilating. The device and the method of the invention can not only ensure the non-pure CO2The curing process is carried out efficiently, the device cost is low, and the operation method is simple and convenient. The reaction temperature, pressure and gas concentration can be measured and automatically recorded, so that the reaction rule can be accurately summarized. More importantly, the invention changes waste gas into valuable and is a carbonization curing technology which really assists carbon peak-reaching carbon neutralization.
Description
Technical Field
The invention belongs to the technical field of cement products, and particularly relates to a method for utilizing non-pure CO2An apparatus and method for curing a cement preform.
Background
The carbon emission of the cement industry accounts for 5 to 8 percent of the global artificial carbon dioxide emission, and is responsible for huge emission reduction pressure. Meanwhile, the theoretical carbon fixation amount of the cement is about half of the weight of the cement, so that the cement product field has huge carbon fixation potential. The cement prefabricated member is carbonized and maintained immediately after being manufactured and molded, so that the strength of the product can be improved instantly, and CO can be used for simultaneously2And (4) converting the carbon into stable carbonate, and permanently sealing the carbonate in a cement prefabricated member to obtain a low-carbon building material product.
So far, the cement products are carbonized and cured by using high purity CO2. However, in order to reduce atmospheric CO2Content of CO which has been discharged into the air2And flue gas CO to be discharged into the air2And collecting and recovering. Low concentration CO, usually non-pure, is captured2These low concentrations of CO2The curing agent is directly used for curing the cement prefabricated member, and has more economic and environmental protection values.
Disclosure of Invention
Aiming at the defects of the prior art and equipment, the invention aims to provide a method for utilizing non-pure CO2The invention relates to a device and a method for curing a cement prefabricated part, which use low-concentration CO2The device and the method are simple, convenient and practical. And the gas concentration in the kettle is easy to measure and adjust, and the carbonization process can be carried out quickly and efficiently. The invention can help carbon neutralization while really reducing carbon emission and prepare green low-carbon building materials, which are the existing non-pure CO utilization2The optimal scheme for curing cement products has wide application prospect.
In order to achieve the purpose, the invention adopts the following technical scheme:
by using non-pure CO2Curing cement prefabricated memberThe apparatus of (1), comprising: gas storage tank 2, pressure reducing valve, vacuum pump 6, reaction kettle 8, pressure gauge 9, temperature sensor 10 and CO2 A concentration detector 14, a computer 15, a valve and an air pipe;
the connection relationship is as follows:
the gas outlet of the gas storage tank 2 is connected with a gas storage tank gas release valve 3, the gas storage tank gas release valve 3 is connected with a first pressure reducing valve 4, and the first pressure reducing valve 4 is connected with a reaction kettle gas inlet valve 5 through a pipeline to form a gas inlet system; the reaction kettle air extraction valve 7 is connected with a vacuum pump 6 to form an air extraction device; a pressure gauge 9 and a temperature sensor 10 are arranged on the reaction kettle cover and used for detecting the temperature and pressure change conditions in the kettle during the reaction; the reaction kettle detection valve 12 is connected with a second pressure reducing valve 13, and the second pressure reducing valve 13 is connected with CO through a pipeline2The concentration detector 14 is connected to form a gas concentration detection device; pressure gauge 9, temperature sensor 10, CO2The concentration detector 14 is connected with a computer 15 to form a data acquisition system; the reaction kettle is also provided with a reaction kettle vent valve 11.
The working pressure of the gas storage tank 2 is 3MPa, and the tank body is provided with a gas inlet and outlet valve, a pressure gauge and a safety valve.
The input range of the first pressure reducing valve 4 and the second pressure reducing valve 13 is 0-25 MPa, and the output range is 0-1 MPa.
The vacuum pump 6 is a rotary-vane vacuum pump and can pump vacuum to-0.9 bar.
The reaction kettle 8 is made of 316L stainless steel and can bear 3MPa pressure.
The measuring range of the pressure gauge 9 is-0.1-10 MPa, and the precision grade is 0.4 grade.
The measurement range of the temperature sensor 10 is 0-200 ℃, and the resolution is 0.1 ℃.
The CO is2The measurement range of the concentration detector 14 is 0-99.99% VOL, and the resolution is 0.01% VOL.
The method for carbonizing and maintaining the cement prefabricated member by the device comprises the following steps:
(1) putting the demolded cement prefabricated part into a reaction kettle 8, closing a reaction kettle air inlet valve 5, a reaction kettle air outlet valve 11 and a reaction kettle detection valve 12, opening a reaction kettle air extraction valve 7, starting a vacuum pump 6 to extract air in the reaction kettle, closing the reaction kettle air extraction valve 7 when the reading of a pressure gauge 9 is-0.85 to-0.9 bar, and closing the vacuum pump 6;
(2) setting the outlet pressure of the first pressure reducing valve 4 to 0.5-5 bar, opening the gas release valve 3 of the gas storage tank, and discharging CO in the gas storage tank 22Non-pure CO with volume concentration of 15-50%2The gas is decompressed through a first decompression valve 4, and then is introduced into the reaction kettle through a reaction kettle air inlet valve 5, the cement prefabricated part in the reaction kettle 8 is maintained, and timing is started after the reading of a pressure gauge 9 reaches 0.5-5 bar;
(3) during the curing period, CO is utilized every 15-60 min2The concentration detector 14 tests CO of gas in the primary reaction kettle2Concentration; during testing, the detection valve 12 of the reaction kettle is opened first, and the gas flows to CO after being decompressed by the second decompression valve 132 Concentration detector 14, CO2After the dial reading of the concentration detector 14 is stable, reading the concentration value, and closing the detection valve 12 of the reaction kettle; if CO is present2If the concentration is lower than 10 percent, closing the air inlet valve 5 of the reaction kettle, opening the air outlet valve 11 of the reaction kettle to discharge the gas, vacuumizing the reaction kettle again and introducing non-pure CO2；
(4) Finishing maintenance after 1-24 hours from the timing start moment; and then closing the gas storage tank gas release valve 3, the reaction kettle gas inlet valve 5, the reaction kettle gas extraction valve 7 and the reaction kettle detection valve 12, opening the reaction kettle gas release valve 11, releasing gas, and taking out the cured cement prefabricated member.
Compared with the prior art, the invention has the following beneficial effects:
(1) non-pure CO2The method is successfully applied to the field of carbonization of cement prefabricated members, and the carbonization device and the method have low cost and simple and convenient operation;
(2) the concentration values of temperature, pressure and gas can be measured and recorded in a computer at any time, thereby ensuring effective control of reaction parameters and accurate control of reaction rules. The gas concentration in the reaction kettle can be controlled to be over 10 percent all the time, thereby ensuring that the non-pure CO is ensured2The maintenance process is carried out efficiently;
(3) without using produced high-purity CO2But changes waste gas into valuable, and really assists the action of carbon neutralization when carbon reaches the peak.
Drawings
FIG. 1 is a schematic view of a carbonization and maintenance device.
Wherein, 1 is an air inlet valve of the air storage tank, 2 is the air storage tank, and 3 is an air outlet valve of the air storage tank; 4-first pressure relief valve; 5-air inlet valve of reaction kettle; 6-vacuum pump; 7-reaction kettle extraction valve; 8-reaction kettle; 9-pressure gauge; 10-temperature sensor; 11-reactor vent valve; 12-reaction kettle detection valve; 13-second relief valve; 14-CO2A concentration detector; 15-computer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in FIG. 1, the invention utilizes impure CO2The device of maintenance cement prefab, its characterized in that: the method comprises the following steps: gas storage tank 2, pressure reducing valve, vacuum pump 6, reaction kettle 8, pressure gauge 9, temperature sensor 10 and CO2 A concentration detector 14, a computer 15, a valve and an air pipe;
the connection relationship is as follows:
the gas outlet of the gas storage tank 2 is connected with a gas storage tank gas release valve 3, the gas storage tank gas release valve 3 is connected with a first pressure reducing valve 4, and the first pressure reducing valve 4 is connected with a reaction kettle gas inlet valve 5 through a pipeline to form a gas inlet system; the reaction kettle air extraction valve 7 is connected with a vacuum pump 6 to form an air extraction device; a pressure gauge 9 and a temperature sensor 10 are arranged on the reaction kettle cover and used for detecting the temperature and pressure change conditions in the kettle during the reaction; the reaction kettle detection valve 12 is connected with a second pressure reducing valve 13, and the second pressure reducing valve 13 is connected with CO through a pipeline2The concentration detector 14 is connected to form a gas concentration detection device; pressure gauge 9, temperature sensor 10, CO2The concentration detector 14 is connected with a computer 15 to form a data acquisition system; the reaction kettle is also provided with a reaction kettle vent valve 11.
Example 1
(1) The size after demoulding is as follows
The cylindrical cement prefabricated member is placed into a reaction kettle 8, a reaction kettle air inlet valve 5, a reaction kettle air outlet valve 11 and a reaction kettle detection valve 12 are opened, a reaction kettle air extraction valve 7 is opened, a vacuum pump 6 is started to extract air in the reaction kettle, the reaction kettle air extraction valve 7 is closed when the reading of a pressure gauge 9 is-0.85 to-0.9 bar, and the vacuum pump 6 is closed;
(2) the outlet pressure of the first pressure reducing valve 4 was set to 1 bar. The gas discharge valve 3 of the gas storage tank is opened, and CO in the gas storage tank 2245% by volume of impure CO2The gas is decompressed through a first decompression valve 4, and then is introduced into the reaction kettle through a reaction kettle air inlet valve 5, the cement prefabricated part in the reaction kettle 8 is maintained, and timing is started when the reading of a pressure gauge 9 reaches 1 bar. During the period, the pipeline between the gas storage tank 2 and the reaction kettle 8 is kept smooth, so that the pressure in the reaction kettle can be automatically supplemented with gas to restore the pressure value after the pressure is reduced;
(3) during the curing period, CO is used every 45min2Concentration detector 14 detects CO of gas in primary reaction kettle2And (4) concentration. During testing, the detection valve 12 of the reaction kettle is opened first, and the gas flows to CO after being decompressed by the second decompression valve 132 Concentration detector 14, CO2And (4) reading the concentration value after the dial reading of the concentration detector 14 is stable, and closing the detection valve 12 of the reaction kettle. If CO is present2If the concentration is lower than 10%, the air inlet valve 5 of the reaction kettle is closed, and the air outlet valve 11 of the reaction kettle is opened to discharge the air. Then the reaction kettle is vacuumized again and is filled with non-pure CO2。
(4) From the time of starting the timing, the curing was terminated after 2 hours. And then closing other valves, opening the reaction kettle gas release valve 11 to release gas, and taking out the test piece. And (3) spraying phenolphthalein solution on the cross section after the test piece is cut, wherein the color of the cross section has no obvious change, which indicates that the whole prefabricated part has reached a higher carbonization curing degree. The compression test shows that the compressive strength of the test piece at the moment is 18-20 MPa.
Example 2
(1) The size after demoulding is as follows
The cylindrical cement prefabricated member is placed into a reaction kettle 8, a reaction kettle air inlet valve 5, a reaction kettle air outlet valve 11 and a reaction kettle detection valve 12 are opened, a reaction kettle air extraction valve 7 is opened, a vacuum pump 6 is started to extract air in the reaction kettle, the reaction kettle air extraction valve 7 is closed when the reading of a pressure gauge 9 is-0.85 to-0.9 bar, and the vacuum pump 6 is closed;
(2) the outlet pressure of the first pressure reducing valve 4 was set to 3 bar. The gas discharge valve 3 of the gas storage tank is opened, and CO in the gas storage tank 2230% by volume of impure CO2The gas is decompressed through the first decompression valve 4, and then is introduced into the reaction kettle through the reaction kettle air inlet valve 5, the cement prefabricated part in the reaction kettle 8 is maintained, and timing is started when the reading of the pressure gauge 9 reaches 3 bar. During the period, the pipeline between the gas storage tank 2 and the reaction kettle 6 is kept smooth, so that the pressure in the reaction kettle can be automatically supplemented with gas to restore the pressure value after the pressure is reduced;
(3) during the curing period, CO is used every 60min2The concentration detector 14 tests CO of gas in the primary reaction kettle2And (4) concentration. During testing, the detection valve 12 of the reaction kettle is opened first, and the gas flows to CO after being decompressed by the second decompression valve 132 Concentration detector 14, CO2And (4) reading the concentration value after the dial reading of the concentration detector 14 is stable, and closing the detection valve 12 of the reaction kettle. If CO is present2If the concentration is lower than 10%, the air inlet valve 5 of the reaction kettle is closed, and the air outlet valve 11 of the reaction kettle is opened to discharge the air. Then the reaction kettle is vacuumized again and is filled with non-pure CO2。
(4) After 5 hours from the start of the timing, the curing was terminated. And then closing other valves, opening the reaction kettle gas release valve 11 to release gas, and taking out the test piece. And (3) spraying phenolphthalein solution on the cross section after the test piece is cut, wherein the color of the cross section is unchanged, which indicates that the whole prefabricated part has reached a higher carbonization curing degree. The compressive strength of the test piece is 22-25 MPa.
Example 3
(1) The size after demoulding is as follows
The cylindrical cement prefabricated member is placed into a reaction kettle 8, a reaction kettle air inlet valve 5, a reaction kettle air outlet valve 11 and a reaction kettle detection valve 12 are opened, a reaction kettle air extraction valve 7 is opened, a vacuum pump 6 is started to extract air in the reaction kettle, the reaction kettle air extraction valve 7 is closed when the reading of a pressure gauge 9 is-0.85 to-0.9 bar, and the vacuum pump 6 is closed;
(2) the outlet pressure of the first pressure reducing valve 4 was set to 5 bar. The gas discharge valve 3 of the gas storage tank is opened, and CO in the gas storage tank 22Non-pure CO at a concentration of 20% by volume2The gas is decompressed through the first decompression valve 4, and then is introduced into the reaction kettle through the reaction kettle air inlet valve 5, the cement prefabricated part in the reaction kettle 8 is maintained, and timing is started when the reading of the pressure gauge 9 reaches 5 bar. During the period, the pipeline between the gas storage tank 2 and the reaction kettle 8 is kept smooth, so that the pressure in the reaction kettle can be automatically supplemented with gas to restore the pressure value after the pressure is reduced;
(3) during the curing period, CO is used every 30min2The concentration detector 14 tests CO of gas in the primary reaction kettle2And (4) concentration. During testing, the detection valve 12 of the reaction kettle is opened first, and the gas flows to CO after being decompressed by the second decompression valve 132 Concentration detector 14, CO2And (4) reading the concentration value after the dial reading of the concentration detector 14 is stable, and closing the detection valve 12 of the reaction kettle. If CO is present2If the concentration is lower than 10%, the air inlet valve 5 of the reaction kettle is closed, and the air outlet valve 11 of the reaction kettle is opened to discharge the air. Then the reaction kettle is vacuumized again and is filled with non-pure CO2。
(4) After 8 hours from the start of the timing, the curing was terminated. And then closing other valves, opening the reaction kettle gas release valve 11 to release gas, and taking out the test piece. And (3) spraying phenolphthalein solution on the cross section after the test piece is cut, wherein the color of the cross section is unchanged, which indicates that the whole prefabricated part has reached a higher carbonization curing degree. The compressive strength of the test piece is 26-28 MPa.
Claims (9)
1. By using non-pure CO2The device of maintenance cement prefab, its characterized in that: the method comprises the following steps: gas storage tank (2), pressure reducing valve (4), vacuum pump (6), reaction kettle (8), pressure gauge (9), temperature sensor (10), CO2Concentration ofA detector (14), a computer (15), a valve and an air pipe.
The connection relationship is as follows:
the gas outlet of the gas storage tank (2) is connected with a gas storage tank gas release valve (3), the gas storage tank gas release valve (3) is connected with a first pressure reducing valve (4), and the first pressure reducing valve (4) is connected with a reaction kettle gas inlet valve (5) through a pipeline to form a gas inlet system; the reaction kettle air extraction valve (7) is connected with a vacuum pump (6) to form an air extraction device; a pressure gauge (9) and a temperature sensor (10) are arranged on the reaction kettle cover and used for detecting the temperature and pressure change conditions in the kettle during the reaction; the reaction kettle detection valve (12) is connected with a second pressure reducing valve (13), and the second pressure reducing valve (13) is connected with CO through a pipeline2The concentration detector (14) is connected to form a gas concentration detection device; a pressure gauge (9), a temperature sensor (10), CO2The concentration detector (14) is connected with a computer (15) to form a data acquisition system; the reaction kettle is also provided with a reaction kettle gas release valve (11).
2. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the working pressure of the gas storage tank (2) is 3MPa, and the tank body is provided with a gas inlet and outlet valve, a pressure gauge and a safety valve.
3. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the input range of the first pressure reducing valve (4) and the second pressure reducing valve (13) is 0-25 MPa, and the output range of the first pressure reducing valve and the second pressure reducing valve is 0-1 MPa.
4. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the vacuum pump (6) is a rotary-vane vacuum pump and can pump vacuum to-0.9 bar.
5. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the reaction kettle (8) is made of 316L stainless steel and can bear 3MPa pressure.
6. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the measuring range of the pressure gauge (9) is-0.1-10 MPa, and the precision grade is 0.4 grade.
7. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the measurement range of the temperature sensor (10) is 0-200 ℃, and the resolution is 0.1 ℃.
8. The method of claim 1, wherein the CO is non-pure CO2The device of maintenance cement prefab, its characterized in that: the CO is2The measurement range of the concentration detector (14) is 0-99.99% VOL, and the resolution is 0.01% VOL.
9. A method for the carbonisation curing of cement pre-forms by means of the installation according to any one of claims 1 to 8, characterised in that: the method comprises the following steps:
(1) putting the demolded cement prefabricated part into a reaction kettle (8), closing a reaction kettle air inlet valve (5), a reaction kettle air discharge valve (11) and a reaction kettle detection valve (12), opening a reaction kettle air suction valve (7), starting a vacuum pump (6) to suck air in the reaction kettle, closing the reaction kettle air suction valve (7) when the reading of a pressure gauge (9) is-0.85 to-0.9 bar, and closing the vacuum pump (6);
(2) setting the outlet pressure of the first pressure reducing valve (4) to 0.5-5 bar, opening the gas storage tank gas release valve (3), and discharging CO in the gas storage tank (2)2Non-pure CO with volume concentration of 15-50%2The gas is decompressed through a first decompression valve (4), and then is introduced into a reaction kettle through a reaction kettle air inlet valve (5), the cement prefabricated part in the reaction kettle (8) is maintained, and timing is started after the reading of a pressure gauge (9) reaches 0.5-5 bar;
(3) during the curing period, CO is utilized every 15-60 min2The concentration detector (14) is used for testing CO of gas in the primary reaction kettle2Concentration; when in test, the detection valve (12) of the reaction kettle is firstly opened, and the gas flows to the reaction kettle after being decompressed by the second decompression valve (13)CO2Concentration detector (14), CO2After the dial reading of the concentration detector (14) is stable, the concentration value is read, and the detection valve (12) of the reaction kettle is closed; if CO is present2If the concentration is lower than 10 percent, closing the air inlet valve (5) of the reaction kettle, opening the air outlet valve (11) of the reaction kettle to discharge the gas, vacuumizing the reaction kettle again and introducing non-pure CO2；
(4) Finishing maintenance after 1-24 hours from the timing start moment; then, the air storage tank air release valve (3), the reaction kettle air inlet valve (5), the reaction kettle air suction valve (7) and the reaction kettle detection valve (12) are closed, and the reaction kettle air release valve (11) is opened to release air and then the cement prefabricated member after maintenance is taken out.
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| CN110639377A (en) * | 2019-09-24 | 2020-01-03 | 西安鸿钧睿泽新材料科技有限公司 | Device and method for preparing carbon dioxide gas containing air and having different concentrations |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1334954A1 (en) * | 2002-01-25 | 2003-08-13 | KHD Humboldt Wedag AG | Installation for manufacturing cement clinker |
| CN101182144A (en) * | 2007-11-21 | 2008-05-21 | 清华大学 | Cement kiln calcining resource method for domestic waste burning fly ash |
| CN104446058A (en) * | 2014-11-19 | 2015-03-25 | 济南大学 | Carbon dioxide mineralization preparation method of low-temperature calcined clinker and product thereof |
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Application publication date: 20211116 |