CN114347236B - Continuous curing method and system for curing building material products by programmed carbon dioxide - Google Patents
Continuous curing method and system for curing building material products by programmed carbon dioxide Download PDFInfo
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- CN114347236B CN114347236B CN202210103045.6A CN202210103045A CN114347236B CN 114347236 B CN114347236 B CN 114347236B CN 202210103045 A CN202210103045 A CN 202210103045A CN 114347236 B CN114347236 B CN 114347236B
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Abstract
The invention discloses a continuous curing method and a continuous curing system for curing building material products by programmed carbon dioxide 2 The curing process comprises a building material product transferring stage, a pressure increasing stage, a pressure reducing stage, a tail end gas recycling stage and a building material product transferring stage which are sequentially carried out; the pressure boosting stage comprises a recovered gas pressure boosting stage and a raw material gas pressure boosting stage which are sequentially carried out, the number of times of the pressure boosting stage is n, and n is more than or equal to 1 and less than or equal to 8; the times of the pressure reduction stage and the pressure boosting stage are the same; the recovered gas in the pressure-increasing stage of the recovered gas for the x time is derived from the recovered gas discharged by other groups of the curing kettles in the process of the pressure-decreasing stage for the n-x +1 time; wherein x is not more than n, n and x are positive integers, and M is a positive integer more than or equal to 2; the times of the pressure boosting stage are enlarged, and the effective utilization rate of the curing kettle is improved.
Description
Technical Field
The invention relates to the technical field of building material product maintenance, in particular to a continuous maintenance method and a continuous maintenance system for maintaining building material products by programmed carbon dioxide.
Background
By using CO 2 The technology for mineralizing and curing building material products can realize CO 2 The method has the advantages of high efficient utilization, accordance with the national carbon reduction policy requirements, realization of recycling of industrial alkali metal solid wastes, and green and environment-friendly novel building material product maintenance technology.
In the actual industrial device maintenance process, in order to improve CO 2 The mineralized utilization efficiency needs a certain pressure of the raw material gas, aiming at different material characteristics of building material products, the maintenance pressure of the porous building blocks is generally 0.8-1.5MPaG, the maintenance pressure of the solid building blocks is 1.5-2.5MpaG, as the maintenance process belongs to a slow pressure-increasing process, after the maintenance is finished, the maintenance kettle is maintained at a higher maintenance pressure, and the high-pressure gas is rich in CO 2 If discharged directly, CO is produced 2 Reduction in utilization efficiency and CO 2 The waste of gas.
In the prior art, the high-pressure gas is returned to the curing kettle for recycling, but the utilization effect is not good.
Disclosure of Invention
Aiming at the problems in the prior patent, the invention provides a continuous maintenance method for maintaining a building material product by programmed carbon dioxide, which adopts the steps of selecting proper pressure increasing and decreasing times according to the pressure of actual raw material gas; by setting a programmed process control scheme, the flexible adjustment of the operation time of each stage of the maintenance process is realized, the actual effect of the mineralization maintenance is improved, and the application range of the mineralization maintenance process is enlarged; the invention also provides a system for curing the building material products by programmed carbon dioxide, and provides an implementable technical route for industrial design and stable operation of curing the building material products by carbon dioxide.
The main content of the invention is as follows: a continuous curing method for programmed carbon dioxide curing building material products, wherein M groups of curing kettles are arranged, and CO in each group of curing kettles 2 The curing process comprises a building material product moving-in stage, a pressure increasing stage, a pressure reducing stage, a tail end gas recycling stage and a building material product moving-out stage which are sequentially carried out;
the pressure boosting stage comprises a recovered gas pressure boosting stage and a raw material gas pressure boosting stage which are sequentially carried out, the number of times of the pressure boosting stage is n, and n is more than or equal to 1 and less than or equal to 8;
the times of the pressure reduction stage and the pressure boosting stage are the same;
the recovered gas in the pressure-increasing stage of the recovered gas for the x time is derived from the recovered gas discharged by other groups of the curing kettles in the process of the pressure-decreasing stage for the n-x +1 time;
wherein x is not more than n, n and x are positive integers, and M is a positive integer more than or equal to 2.
In the invention, the building material product can be a porous concrete block, a solid concrete block or other concrete products;
in the invention, the pressure boosting stage comprises a recovered gas pressure boosting stage and a raw material gas pressure boosting stage which are sequentially carried out, and the method specifically comprises the following steps: and boosting the pressure of the x-th recovered gas pressure boosting stage by using recovered gas discharged from other curing kettles in the x-th pressure reducing stage, and boosting the pressure to the set pressure of the corresponding pressure boosting stage by using raw material gas.
Further limiting, the duration of the pressure increase of the recovered gas is less than or equal to 30min each time, and the duration of the pressure increase of the raw material gas is more than or equal to 30min each time.
Further, the boosting stage is isocratic boosting, and the terminal pressure P of the xth boosting stage x When the pressure rise of the feed gas for the x time is finished, P x X × p/n; wherein: p is the pressure of the feed gas.
Further defined, when p.ltoreq.1.5 MPaG, 1. ltoreq.n.ltoreq.4.
Further defined, when 1.5MPaG is less than or equal to p is less than or equal to 2.5MpaG, 3 is less than or equal to n is less than or equal to 8.
Further defined, when cutting off one or more groups of curing kettles, adjusting the steps executed by the remaining groups of curing kettles according to the principle of reducing pressure fluctuation.
By adopting a programming design method, the invention has the following beneficial effects:
1. and a programmed design method is adopted to realize the continuous operation of the carbon dioxide mineralization curing process.
2. The effective utilization rate of the curing kettle is improved by setting the optimized boosting stage times by taking the pressure of the raw material gas as the setting basis of the boosting times n (namely n is not required to be limited within a special range).
3. A plurality of programmed control methods can be set according to different selected n values, so that the requirements of the raw material gas composition or pressure condition change on the maintenance process and the requirements of the raw materials of the building material products on the adjustment of the maintenance process after the raw materials are adjusted are met.
The invention also discloses a system for curing building material products by programming carbon dioxide, which comprises M groups of curing kettles, wherein each group of curing kettles is communicated with a recovery gas pipe network through a pressure control valve, each group of curing kettles is communicated with a raw gas pipe network through a pressure control valve, each group of curing kettles is provided with a pressure detection element, the recovery gas pipe network is communicated with a tail gas treatment device, and a pressure control valve is arranged between the recovery gas pipe network and the tail gas treatment device.
Further, the pressure detection element and each of the pressure control valves are controlled by a PLC or a DCS.
Further, the tail gas treatment device comprises an absorption tower, an absorption liquid settling tank, an absorption liquid configuration tank and an absorption liquid circulating pump which are sequentially communicated, wherein an outlet of the absorption liquid circulating pump is communicated with the absorption tower; the absorption liquid settling tank is also communicated with a slurry delivery pump, and the top of the absorption tower is provided with a tail gas discharge port.
The invention has the beneficial effects that: the tail gas is absorbed by the absorption system, so that the content of carbon dioxide in the exhaust gas is reduced, the carbon emission is reduced, and the CO is realized 2 High-efficiency utilization of gas; and automatic cutting-off and cutting-in of each group of curing kettles are realized by a PLC or DCS programmed design method, so that flexible adjustment and fault cutting-off of the operating load of the curing kettles are realized, and the flexibility and reliability of operation of the carbon dioxide curing device are improved.
Drawings
FIG. 1 shows CO in 6 curing kettles in one embodiment 2 A schematic flow diagram of the mineralization process;
FIG. 2 is a schematic process flow diagram of an apparatus for treating tail gas according to an embodiment;
wherein: 1-an absorption column; 2-absorption liquid settling tank; 3-absorption liquid configuration tank; 4-absorption liquid circulating pump; 5-slurry delivery pump.
FIG. 3 shows CO in 8 curing kettles in example 1 2 The process flow of the mineralization is schematic.
Detailed Description
Aiming at the existing CO 2 CO in mineralizing and curing technology of building material products 2 The recycling effect is not good, the inventor refers to the existing data and finds that the prior art discloses CO 2 A method for step mineralizing and curing concrete building block includes such steps as creating pressure gradient between different curing kettles, recovering the high-pressure gas in curing kettle to curing kettle with lower pressure step by step via pipeline and valve, returning the tail gas after final step to the slurry in raw material gas preparing step, providing gas source for microcrystal reaction of slurry, and further realizing CO reaction 2 High-efficiency utilization of gas.
The number of the curing kettles, the number of times of step pressure reduction and the curing time are all clearly required, but no clear flow design and control implementation scheme is provided, the application range and the actual industrial application of the step mineralization curing process are limited, and the method at least has the following limitations:
1. the design of N +1 groups of reaction kettles is adopted, wherein N is the boosting frequency, N is limited to be more than or equal to 3 and less than or equal to 8, the conditions that N is more than 8 and N is less than 3 are not described, and the application range of the mineralization process is limited;
2. the boosting frequency is limited to N times, when the pressure of the raw material gas is lower, the low-pressure maintenance period is longer due to excessive boosting and reducing frequency, the actual mineralization efficiency is reduced, and simultaneously, CO is generated in the mineralization process 2 The pressure is reduced after absorption, so the excessive pressure increasing and reducing times can not effectively improve CO 2 The recovery efficiency of the gas reduces the effective utilization rate of the equipment;
3, the same time setting is adopted in the stage of boosting and curing the raw material gas for N times, and due to the difference of mineralization curing effects under different pressures, the mineralization efficiency in the actual curing process is reduced by adopting the same curing time setting;
4. when a valve or equipment has a fault, no clear processing scheme is provided, so that the flexibility of the operation of the device is reduced;
5. although a cyclic process can be adopted, no clear cyclic process operation embodiment is provided, executable system control logic is lacked, the utilization efficiency of the curing kettle is not clear, and the design requirements of an actual industrial device cannot be met.
6. The tail gas treatment process in a microcrystallization device needs to customize a special stirring kettle suitable for microcrystallization reaction.
Aiming at the limitations of the method, the invention discloses a continuous curing method for curing building material products by programmed carbon dioxide, wherein M groups of curing kettles are arranged, and CO in each group of curing kettles 2 The curing process comprises a building material product transferring stage, a pressure increasing stage, a pressure reducing stage, a tail end gas recycling stage and a building material product transferring stage which are sequentially carried out;
the pressure boosting stage comprises a recovered gas pressure boosting stage and a raw material gas pressure boosting stage which are sequentially carried out, the number of times of the pressure boosting stage is n, and n is more than or equal to 1 and less than or equal to 8;
the times of the pressure reduction stage and the pressure boosting stage are the same;
the recovered gas in the pressure-increasing stage of the recovered gas for the x time is derived from the recovered gas discharged by other groups of the curing kettles in the process of the pressure-decreasing stage for the n-x +1 time;
wherein x is not more than n, n and x are positive integers, and M is a positive integer more than or equal to 2.
For a better understanding of the continuous curing method of the present invention, the following is specifically set forth:
first, the process of front end material configuration, mold making, cutting and the like is not considered for CO 2 The influence of the curing process, namely the preparation of the raw material gas before the mineralization curing is started and the supply of the building material product to be cured is sufficient, aims at CO 2 The stages of the curing kettle in the curing process are defined by the following codes:
code number T: a building material product transfer stage (the process of moving the building material product into and out of the curing kettle);
code number P: the raw material gas pressure increasing stage is represented as P1, P2, P3 and the like in sequence according to different stages, wherein P1 represents the first raw material gas pressure increasing, P2 represents the second raw material gas pressure increasing, and the like;
code number R: a recovered gas pressure boosting stage, wherein high-pressure maintenance gas from other kettles boosts the pressure of the maintenance kettles, the recovered gas pressure boosting stage is represented by R1, R2 and R3 (the sequence is R1 → R3), R1 represents the pressure boosting duration of the first recovered gas, R2 represents the pressure boosting of the second recovered gas, and the like;
code number D: CO during the pressure reduction stage of the recovered gas and after the maintenance is finished 2 Carrying out pressure reduction and recovery in stages, wherein the pressure reduction stages of the recovered gas are represented as D3, D2 and D1 (the sequence is D3 → D1), D3 represents the pressure reduction of the recovered gas for the first time, D2 represents the pressure reduction of the recovered gas for the second time, D1 represents the pressure reduction process of the recovered gas for the third time, and so on;
code number FD: a tail end gas recovery stage, wherein after the pressure reduction process of the recovered gas is finished, part of low-pressure CO is also arranged in the curing kettle 2 And gas is recovered by the tail gas recovery device, and the maintenance kettle is in a state close to normal pressure after the tail gas is recovered.
After a terminal gas recovery stage (FD)Reactor protection to complete CO 2 In the curing process, the curing kettle enters a building material product transfer stage (T), and the curing kettle completes a cycle.
Taking 1 recycle gas pressure increase, 1 raw material gas pressure increase and 1 pressure decrease as examples, the curing process of a single curing kettle set (each curing kettle set includes at least 1 curing kettle) can be described as follows by the above-defined code:
T→R1→P1→D1→FD→T
all the curing kettles are mineralized and cured according to the sequence, different groups of curing kettles are in different curing stages at the same time, and the state conditions of the curing kettles at different times can be intuitively and accurately described by adopting a programmed design scheme. It should be noted that: the state of each curing kettle in the single curing kettle group at the same time is the same.
Taking one-time pressure rise and fall maintenance process of two groups of maintenance kettles as an example to illustrate a programmed design scheme, dividing the maintenance kettles into 4 stages according to the body change of the maintenance kettles in the maintenance process, and programming CO 2 The curing process embodiment is specifically described in table 1.
TABLE 1 two kettle CO 2 Programmed implementation method of maintenance process
As can be seen from table 1, the curing process of each curing kettle group includes 4 stages, wherein the end gas recovery process FD and the block transfer process T belong to two processes performed in sequence, and are combined into one stage for convenience of programming.
By the programmed design method, the CO of 2 groups of curing kettles is realized 2 The maintenance process, the synchronization of the pressure increase of the return gas and the pressure reduction of the maintenance gas (namely R1 and D1), and the separation of the pressure increase stage (R stage) of the recovery gas and the pressure increase stage (P stage) of the raw material gas in sequence, wherein the pressure increase time of the recovery gas and the pressure increase time of the raw material gas are respectively set to be CO 2 The operation adjustment of the mineralization maintenance process provides an effective means.
II, in CO 2 Curing processIn the middle, the pressure of the curing kettle gradually rises along with the curing process, and at the end of the curing process, higher curing pressure is maintained in the curing kettle for increasing CO 2 The utilization rate of gas and the CO in the last stage of the curing process are reduced by setting multi-stage depressurization 2 And recycling is carried out.
The maintenance effect of the maintenance kettle is affected by adopting different pressure increasing and reducing times. And with CO in the process of mineralization 2 The consumption of gas and the excessive pressure increasing and reducing times can reduce the utilization efficiency of the curing kettle and simultaneously reduce the operation flexibility and operability of the curing kettle.
Taking 4 curing kettle curing processes as an example, the CO of 3 times of recycling gas pressure increasing and decreasing operations and 2 times of recycling gas pressure increasing and decreasing operations 2 Comparing and explaining the maintenance process;
the program design of 3 times of pressure-raising and pressure-reducing operations of 4 sets of curing kettle is shown in Table 2.
The program design of 2 times of pressure-raising and pressure-reducing operations of 4 sets of curing kettle is shown in Table 3.
Table 2 shows the curing process of 4 curing kettles using 3-time pressure-increasing/decreasing scheme
Description of arrangement: and sequentially curing each group of curing kettles according to the sequence of the stage 1 → 16, wherein each curing kettle is in a different curing state in different stages, and each curing kettle performs corresponding curing operation according to set time.
Table 3 shows the curing process of 4 curing kettles using 2-time pressure-increasing/decreasing scheme
Description of arrangement: and sequentially curing each group of curing kettles according to the sequence of the stage 1 → 12, wherein each group of curing kettles in different stages are in different curing states, and each group of curing kettles performs corresponding curing operation according to set time.
By contrast, inOn the premise of ensuring that the cycle periods of the single-group kettles are all 540min, the maintenance time of the high-pressure maintenance stage is reduced by adopting 3 times of pressure boosting operation in the table 2, and the maximum maintenance time (P3) of the high-pressure maintenance stage in the table 2 is 120 min; while the maximum curing time (P2) in the high pressure curing stage in Table 3 was 255min, the increase in mineralization pressure was favorable for CO 2 The mineralization rate is increased, so that the CO under the high-pressure condition is increased as much as possible 2 The maintenance time is advantageous for improving the mineralization efficiency, and thus, it is known that appropriately reducing the number of times of raising and lowering the pressure (R/D) of the recovered gas is advantageous for improving the mineralization efficiency.
The setting of the pressure increasing and reducing times n of the recycled gas in the curing process of the programmed design method is determined according to the pressure of the raw material gas, when the pressure of the raw material gas is less than or equal to 1.5MPaG, the pressure increasing times range of the recycled gas is set to be that n is less than or equal to 4 and is preferably less than or equal to 3 and is more than or equal to 2; when the pressure of the raw material gas is more than or equal to 1.5MPaG and less than or equal to 2.5MPaG, the pressure increasing frequency range of the recovered gas is set to be more than or equal to 3 and less than or equal to 8, and preferably more than or equal to 4 and less than or equal to 6.
Thirdly, the programmed design method can achieve the aim of flexibly adjusting the time setting of the boosting process at each stage by setting a plurality of programmed control schemes, thereby meeting the requirements of different raw material compositions or raw material gas pressures on CO 2 And (5) requirements of a mineralization curing process.
The 6 maintenance kettle processes and the 2 recovery gas pressure boosting processes are taken as an example for explanation, the process totally relates to the 2 raw material gas pressure boosting processes, namely a P1 stage and a P2 stage, and the duration time of the P1 stage and the duration time of the P2 stage are flexibly adjusted on the premise of ensuring that the total effective pressure boosting time is not changed through different program design schemes.
Taking any one group of curing kettles as an example, the time distribution of each stage of different programming schemes is shown in table 4 below under the premise of ensuring the matching of each stage of the programming.
Table 46 shows the program design scheme of different adjustment modes of the curing process of the curing kettle
By contrast, on the premise of ensuring the consistency of the effective maintenance time, the adjustment mode 1 is adopted, the duration time of the P1 stage is 60min, and the duration time of the P2 stage is 345 min; adopting an adjusting mode 2, wherein the duration time of the P1 stage is 150min, and the duration time of the P2 stage is 255 min; the mineralized maintenance process can be flexibly adjusted by adopting different adjusting modes.
And fourthly, when the maintenance kettle has faults or the maintenance kettle has reduced load, the programmed maintenance process can execute a removal function, remove the faulty or stopped equipment out of the system, adjust the phase sequence of the rest maintenance kettles according to the principle of reducing pressure fluctuation, ensure the stable operation of the system and improve the flexibility and the reliability of the operation of the device.
Taking 6 sets of curing kettle curing processes as an example, when the equipment is in failure or is out of service, the curing kettle curing processes can be automatically switched to 5 sets of curing kettle curing processes through a PLC or DCS program. In normal operation, the programming scheme for 2 pressure-raising and pressure-reducing operations in the curing process of 6 curing kettles is shown in table 6.
Table 56 group curing kettle curing flow program design scheme
When the operation load is adjusted or the maintenance kettle has a fault, the method can automatically or manually cut off the corresponding group maintenance kettle and the matched instrument, and the program executes 5 groups of maintenance kettle maintenance processes and 2 times of pressure increasing and reducing programs.
Taking cutting off F groups of curing kettles as an example, 5 groups of operations are carried out, and the design scheme of the curing process program of the 5 groups of curing kettles is shown in Table 6.
Table 65 group maintenance kettle maintenance flow program design scheme (F kettle cutting)
Through the cutting program, the automatic cutting system of the single group of curing kettles can be realized, and the stability and the reliability of the operation of the device are improved.
In summary, the present invention provides a new methodProgrammed CO of 2 The mineralization maintenance process adopts an optimized programmed design method to realize CO 2 The mineralization curing process is automatically controlled, and the mineralization curing efficiency and the effective utilization rate of the curing kettle are improved;
the effective utilization efficiency of the maintenance kettle is improved through optimized program design, and the time of a high-pressure maintenance stage is prolonged as far as possible on the premise of ensuring the matching of the lifting process of the recovered gas through the optimized adjustment of the lifting times.
By setting a programmed process design scheme with multiple adjustment modes, the requirements of feed gas composition or pressure change and raw material adjustment of building material products on the mineralization maintenance process are met.
By adding the cutting function of the curing kettle, the flexible adjustment of the operation load of the curing kettle and the automatic cutting system of fault equipment and matched instruments are realized, and the flexibility and the reliability of the operation of the device are improved.
The invention also discloses a system for curing building material products by programmed carbon dioxide, which comprises M groups of curing kettles, wherein each group of curing kettles is communicated with a recovery gas pipe network through a pressure control valve; further, the pressure detection element and each pressure control valve are controlled by a PLC or a DCS; further, the tail gas treatment device comprises an absorption tower, an absorption liquid settling tank, an absorption liquid configuration tank and an absorption liquid circulating pump which are sequentially communicated, wherein an outlet of the absorption liquid circulating pump is communicated with the absorption tower; the absorption liquid settling tank is also communicated with a slurry delivery pump, and the top of the absorption tower is provided with a tail gas discharge port.
The pressure control valve is specifically as follows:
this system needs to set up 2 xM pressure control valve, every group maintenance cauldron disposes 2 pressure control valves promptly, wherein 1 is raw materials atmospheric pressure control valve, communicate with the raw materials pipe network, another is recovered gas pressure control valve, communicate with the recovered gas pipeline of lift pressure stage, set up 1 pressure control valve at tail gas processing apparatus entry, communicate the pressure of the terminal recovered gas of control with recovered gas pipeline, the control valve adopts manual valve or automatic valve to operate, preferably adopt automatic control valve, automatic control valve configuration solenoid valve and valve check and valve position feedback, according to the different stages that the maintenance cauldron was located, adjust according to the pressure setting of the time cycle of settlement and maintenance cauldron through supporting control valve, the concrete description is as follows:
(1) feed gas pressure increasing stage P
When the curing kettle is in the stage of raw material gas pressure rising (P), CO 2 The raw material gas control valve is automatically opened according to the initial pressure at the beginning of the curing kettle stage and the set terminal pressure (p) x ) And the difference value is controlled in an equal proportion or linear regulation mode within a set time range.
Terminal pressure p of curing kettle x Setting method
n: total number of times of pressure increase of raw gas
n x : pressure increase of the x-th raw material gas
p: pressure of raw gas
Then p is x ＝n x ×p/n
For example, the following steps are carried out: the pressure of the raw material gas is 1.2MPaG, the total pressure rise times of the raw material gas are 3 times, and then the pressure set value p of the terminal of the pressure rise of the raw material gas at the 2 nd time is 2 ＝2×1.2/3＝0.8MPaG
(2) Recycle gas pressure increasing stage R (synchronous with pressure decreasing stage D)
When the curing kettle is in a recycling gas pressure increasing and decreasing stage, the recycling gas pressure control valves of the two groups of curing kettles corresponding to the pressure increasing and decreasing stage are opened, wherein the curing kettle control valve in the pressure increasing stage is set to be at a fixed opening degree (40% -70%), the curing kettle regulating valve in the pressure decreasing stage performs pressure control regulation according to the pressure difference value of the two curing kettles and a set time period and in an equal proportion or linear regulation mode, and when the stage is finished, the pressure of the two groups of curing kettles is balanced.
(3) End gas depressurization phase FD
When the curing kettle is in a tail end gas pressure reduction stage (FD), a curing kettle recycled gas pressure control valve is opened, the recycled gas pressure control valve is set to be a fixed opening degree (40% -70%), the tail end gas outlet pressure control valve automatically controls and adjusts in a period range according to the curing kettle pressure in the tail end gas pressure reduction stage and a set time period in an equal proportion or linear adjusting mode, and when the maintenance kettle is ensured to be at the end, the pressure of the curing kettle is close to normal pressure.
The tail gas pressure reduction control valve is arranged on a main pipe connected with a recovered gas outlet and a tail gas absorption system, 1 pressure reduction control valve is set, and pressure regulation control is carried out on the curing kettle in a tail gas recovery process (FD) at different times according to stage setting according to sequential control requirements.
Taking 6 curing kettles as an example, each curing kettle is a group, and the system for curing the building material product by using carbon dioxide is shown in figure 1; it should be noted that: in this system, pressure control valve can manual control also can automatic control, selects specific valve according to actual need, but both's operation mode is the same, and this system can adopt manual control also can adopt PLC/DCS automatic control.
The tail gas treatment device comprises an absorption tower 1, an absorption liquid settling tank 2, an absorption liquid configuration tank 3 and an absorption liquid circulating pump 4 which are sequentially communicated, wherein an outlet of the absorption liquid circulating pump 4 is communicated with the absorption tower 1; the absorption liquid settling tank 2 is also communicated with a slurry delivery pump 5, and the top of the absorption tower 1 is provided with a tail gas discharge port.
Specifically, as shown in FIG. 2, CO is utilized 2 The method comprises the following steps of preparing slaked lime slurry with a certain concentration by taking quick lime in ingredients of mineralized building blocks as a raw material, introducing the slaked lime slurry into a tail gas absorption tower 1 through a slurry circulating pump, allowing tail gas from a mineralized tail gas recovery terminal to enter the absorption tower 1 from the bottom of the absorption tower 1 and to be in countercurrent contact with the slurry, and allowing CO in the tail gas to be in countercurrent contact with the slurry 2 Is absorbed by the slurry to absorb CO 2 The slurry passes through the absorption liquid settling tank 2, is separated and settled and then enters the absorption liquid configuration tank 3, is pumped into the absorption tower 1 through the absorption liquid circulating pump 4 for cyclic utilization, when the concentration of the absorption liquid is reduced, new quicklime raw materials are supplemented in the absorption liquid configuration tank 3, and the bottom slurry separated by the absorption liquid settling tank 2 is pumped back into the raw material configuration tank through the slurry delivery pump 5 to be used as the raw materials of the building blocks. The tail gas treatment device can realize CO 2 The effective utilization rate of the gas reaches more than 95 percent.
Example 1
This embodiment takes 30 km 3 An annual aerated concrete block production device is taken as an example, and CO is carried out 2 And (5) mineral curing process flow description.
CO 2 The main raw materials required by the process for maintaining the building material product comprise cement, fly ash, blast furnace slag, quicklime, gypsum powder, a foaming agent and a stabilizer.
The raw materials are delivered into a curing kettle through a delivery track for CO treatment after the procedures of proportioning, stirring, pouring, pre-curing, demoulding, cutting and the like 2 And (5) maintaining.
The specification and the model of the building material product prepared in the embodiment and the product quality conform to the standard requirements of GB/T11968-2020.
CO 2 The quantity of the curing kettles collocated in the mineralization curing stage is 8, the effective curing time of the curing kettles is 8 hours, and CO is added 2 Air supply pressure 1MPaG, the maintenance cauldron adopts single cauldron independent operation mode (being every group a maintenance cauldron promptly), 8 raw material gas pressure control valves are disposed to the maintenance system altogether, 8 recovered gas pressure control valves, 1 end tail gas pressure control valve, the one set of tail gas absorption system of maintenance system configuration, the absorption tower adopts the empty tower to spray the structure among the tail gas absorption system, set up 1 absorption liquid settling tank, 1 absorption liquid configuration groove, absorption liquid circulating pump and thick liquids outward send the pump, the system is as shown in figure 2.
According to the pressure of the feed gas (1MPaG), CO 2 The mineralization curing process adopts a 2-stage pressure boosting flow, the pressure of the raw material gas pressure boosting stage (P1 and P2) is 0.5MPaG and 1MPaG respectively, taking A curing kettle as an example, and the pressure change of curing in each stage is shown in Table 7.
TABLE 7 distribution of pressure changes at various stages of the curing kettle
In this example, the process flow programming corresponding to a method for curing building material products with carbon dioxide is shown in table 8.
TABLE 88 2 times CO pressure increase and decrease of the kettle 2 Maintenance flow programming
During the initial operation, the building material products to be cured are loaded from the curing kettle A according to the sequence of the 1 stage, meanwhile, the curing kettle B to the curing kettle H utilize raw material gas as an initial boosting gas source according to the sequence requirement of the 1 stage, the curing kettle is subjected to initial boosting operation, after the set pressure is reached, all valves are put into an automatic state, the system performs corresponding operation through a pressure control valve configured in the system according to the sequence of the stage time and the pressure parameter set by a program, and the system circularly operates according to the sequence of the stages from 1 to 24.
In the present system, the time of each stage is set as follows: the time of the R/D (pressure increasing and reducing process) stage is set to be 15min, the time of the primary pressure increasing stage P1 is set to be 180min, the time of the secondary pressure increasing stage P2 is set to be 265min, wherein the effective curing time (R + P stage) is 475min in total, and the total time of the tail gas pressure reducing and building block transferring stage (FD + T stage) is 55 min. The time setting of each stage can be adjusted according to the actual running condition of the process.
Tail gas is absorbed by a tail gas treatment system and then is discharged at a high point, and the concentration and the circulation amount of alkali liquor in absorption liquid are controlled to control the CO of the discharged gas 2 The content is less than or equal to 3 percent.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A continuous curing method for curing building material products by programmed carbon dioxide is characterized in that,
setting M groups of curing kettles, and CO of each group of curing kettles 2 The curing process comprises a building material product transferring stage, a pressure increasing stage, a pressure reducing stage, a tail end gas recycling stage and a building material product transferring stage which are sequentially carried outA product stage;
the pressure boosting stage comprises a recovered gas pressure boosting stage and a raw material gas pressure boosting stage which are sequentially carried out, the number of times of the pressure boosting stage is n, and n is more than or equal to 1 and less than or equal to 8;
the times of the pressure reduction stage and the pressure boosting stage are the same;
the recovered gas in the pressure-increasing stage of the recovered gas for the x time is derived from the recovered gas discharged by other groups of the curing kettles in the process of the pressure-decreasing stage for the n-x +1 time;
wherein x is not more than n, n and x are positive integers, and M is a positive integer more than or equal to 2;
the boosting stage is equal boosting, and the terminal pressure P of the boosting stage for the xth time x When the pressure rise of the feed gas for the x time is finished, P x = x × p/n; wherein: p is the pressure of the feed gas;
when p is less than or equal to 1.5MPaG, n is less than or equal to 1 and less than or equal to 4.
2. The continuous maintenance method according to claim 1, wherein the duration of the pressure increase of the recovered gas is not less than 30min each time, and the duration of the pressure increase of the raw material gas is not less than 30min each time.
3. The continuous curing method of claim 1, wherein when 1.5 MPaG.ltoreq.p.ltoreq.2.5 MpaG, 3. ltoreq.n.ltoreq.8.
4. The continuous curing method of claim 1, wherein when one or more sets of curing pots are cut off, the steps performed by the remaining sets of curing pots are adjusted according to the principle of reducing pressure fluctuation.
5. A system for programmed carbon dioxide curing of building material products according to any one of claims 1 to 4, comprising M sets of curing kettles, each set of curing kettles being communicated with a recycle gas pipe network through a pressure control valve, each set of curing kettles being communicated with a feed gas pipe network through a pressure control valve, each set of curing kettles being provided with a pressure detection element, the recycle gas pipe network being communicated with a tail gas treatment device, and a pressure control valve being provided between the recycle gas pipe network and the tail gas treatment device.
6. A system for programmed carbon dioxide curing of building material products as claimed in claim 5, wherein the pressure sensing element and each of the pressure control valves are controlled by a PLC or DCS.
7. The system for programmed carbon dioxide curing building material products according to claim 5 or 6, wherein the tail gas treatment device comprises an absorption tower, an absorption liquid settling tank, an absorption liquid configuration tank and an absorption liquid circulating pump which are sequentially communicated, and an outlet of the absorption liquid circulating pump is communicated with the absorption tower; the absorption liquid settling tank is also communicated with a slurry delivery pump, and the top of the absorption tower is provided with a tail gas discharge port.
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