CN108549619B - Heat exchange network area matching method based on one-to-one and two-to-two series connection - Google Patents
Heat exchange network area matching method based on one-to-one and two-to-two series connection Download PDFInfo
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Abstract
A heat exchange network area matching method based on one-to-one and two-to-two series connection comprises the following steps of firstly, matching a single existing heat exchange area with a single required heat exchange area, and recycling the existing heat exchanger when conditions are met; secondly, matching two existing heat exchange areas with a single heat exchange area required, and reusing the two existing heat exchangers in a series connection mode if conditions are met; thirdly, recycling the single existing heat exchange area and the single needed heat exchange area in a mode of expanding the matching range, and recycling the existing heat exchanger if the conditions are met; and finally, configuring a new heat exchanger for the residual elements which cannot be matched with the existing heat exchange area in the required area matrix. The invention improves the area reuse rate of the old heat exchange equipment, reduces the investment cost, reduces the calculation time and the calculation cost, and is quick and effective.
Description
Technical Field
The invention relates to a novel heat exchange area matching method which can be used for reforming an existing heat exchange network and improving the performance of the existing heat exchange network.
Background
The heat exchange network is used as the most basic component of energy intensive industries such as petroleum, chemical engineering, energy power and the like and is responsible for industrial energy recovery in the process. The transformation of the existing heat exchange network plays a vital role in integrating process heat and improving the energy utilization efficiency of the heat exchange network, and becomes an important means and method for realizing energy conservation and emission reduction and improving the energy utilization rate in the process industry field. The newly-built market of the heat exchange network is basically saturated, and due to the reasons that the initial design of a factory is unreasonable, the process level is low, the performance is changed after long-term operation and the like, the existing heat exchange network causes the problems that the operation efficiency is low, the energy loss is large and the like. The improvement of the existing heat exchange network can effectively improve the performance of the existing heat exchange network, improve the energy conversion rate and reduce the energy waste and the environmental pollution.
The existing heat exchanger is recycled, the cost of modifying the heat exchange network can be effectively reduced, and the economical efficiency of modifying the existing heat exchange network and the recycling rationality of the existing equipment are improved. In the existing area redistribution method, existing equipment is reused only according to the simplest matching mode, for example, only the required area and the area of the existing heat exchanger are arranged in a descending order and are sequentially matched one by one, and the existing method only uses a single existing heat exchanger to be matched with a single required area. Therefore, the existing area matching strategy is low in calculation efficiency, complex in process and large in reconstruction engineering amount, and the possibility that a plurality of existing heat exchangers are matched with one required area is eliminated, so that the optimal heat exchange area matching mode cannot be found.
Disclosure of Invention
In order to overcome the defects of low calculation efficiency, complex process and large reconstruction workload of the existing area matching strategy, the invention provides a quick and effective heat exchange area matching method based on one-to-one and two-to-two series connection.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a heat exchange network area matching method based on one-to-one and two-to-two series connection comprises the steps of firstly, matching a single existing heat exchange area with a single needed heat exchange area, namely, circulation of G1 and G1, and recycling the existing heat exchanger if the needed heat exchange area is (1 +/-5%) of the existing heat exchange area; secondly, matching two existing heat exchange areas with a single required heat exchange area, namely, circulation with G being 1 and G being 2, and recycling the two existing heat exchangers in a series connection mode if a recycling condition is that the required heat exchange area is 1 +/-5 percent of the sum of the two existing heat exchange areas; then, recycling is carried out in a mode of expanding a matching range by using a single existing heat exchange area and a single required heat exchange area, namely, G is 2, G is 1, the recycling condition is that the required heat exchange area is 20-110% of the existing heat exchange area, and if the condition is met, the existing heat exchanger is recycled; and finally, configuring a new heat exchanger for the residual elements which cannot be matched with the existing heat exchange area in the required area matrix.
Further, for convenience of expression, the following symbols are defined: a. thetTo a desired heat exchange area matrix HrThe t-th element; t isr＝Card{HrRepresents a matrix H of required heat exchange arearThe number of middle elements; a. theeFor existing heat exchange area matrix HeThe elements of (1); t ise＝Card{HeDenotes the existing heat exchange area matrix HeThe number of middle elements; Δ A is the desired area AtAnd the existing heat exchange area A matched with the heat exchange areaeThe difference between, i.e.: Δ A ═ At-Ae；
The method comprises the following steps:
step one, a required area matrix H is formedrThe elements in the formula (I) are arranged in ascending order according to the area size, and G is 1;
step two, making g equal to 1;
step three, let T be Tr＝Card{Hr}，TrMatrix H representing the desired heat transfer arearThe number of middle elements;
step four, judging whether g is equal to 1 or not, if so, AeFor existing heat exchange area matrix HeThe elements of (1); otherwise, HeThe elements in (A) are combined in pairs, and the sum of the existing areas is taken to form Ae；
Step five, finding the matrix H closest to the required arearThe tth element AtElement A of (A)eAnd let Δ a be at-Ae；
Step six, judging whether G is 1;
if G is 1, determining Δ A and AeWhether the ratio is between-5% and 5%; if so, the existing heat exchanger A is recycledeAnd separately At、AeCorresponding element is selected from HrAnd HeThe mixture is removed in the process of (1),and update TeValue of (A), Te＝Card{HeDenotes the existing heat exchange area matrix HeThe number of middle elements; otherwise, entering the next step;
if not, namely G is not 1, determining delta A and AeWhether the ratio is within the range of-80% and 10%; if so, recycling AeCorresponding existing heat exchangers, and respectively At、AeCorresponding element slave matrix Hr、HeRemoving and updating TeA value of (d); otherwise, entering the next step;
step seven, judging whether T is larger than 1 or not, and TeG or more; if yes, enabling t to be t-1, and executing a step four; otherwise, entering the next step;
step eight, judging HrIf the data is an empty set, the matching is finished if the data is the empty set; otherwise, executing the next step;
step nine, judging whether g is equal to 1 or not, and TeGreater than 1; if yes, enabling g to be 2, and executing a step three; otherwise, entering the next step;
step ten, updating TrA value of (d);
step eleven, judging whether G is equal to 1 and T isrGreater than 0, TeGreater than 0; if so, enabling G to be 2, and executing a step two; otherwise, entering the next step;
step twelve, is HrAnd (5) configuring a new heat exchanger by using the residual elements, and completing matching.
The technical conception of the invention is as follows: for the recycling of the existing heat exchanger, the recycling is performed according to the principle (plus or minus 5%) that the area is the closest to the area of a single matched heat exchanger, namely: matching the single existing heat exchange area with the single required area, and finding the existing heat exchanger closest to the required heat exchange area for recycling; matching the rest existing heat exchangers with the required area in a pairwise combination mode according to the principle that the area is the closest, and if the conditions are met, reusing the two existing heat exchangers in a serial mode; then, the single matched condition is widened to-80% + 10%, and the existing heat exchanger closest to the required heat exchange area under the condition is found for recycling; after the existing heat exchanger is recycled, if the required heat exchange areas are not matched, a new heat exchanger is installed for the required areas.
The traditional matching method is as follows: the old equipment is recycled only in a 1-to-1 mode, so that large equipment asset waste exists; and when matching, the elements with the required heat exchange area and the elements with the existing heat exchange area are respectively arranged in a descending order, and each required area needs to be different from all the existing areas so as to find a corresponding matching mode.
The beneficial effects of the prior invention are mainly shown in that: the method can avoid the problems of repeated calculation, complex process, long calculation time and the like caused by single sequential difference in the conventional reconstruction method; moreover, the greatest difference between the method and the prior art is that the possibility of the serial reuse of two old heat exchangers is considered, the area reuse rate of old heat exchange equipment is greatly improved, and the investment cost is reduced. Therefore, the invention not only reasonably and variously reuses the prior heat exchange equipment, realizes the full utilization of the old equipment and reduces the investment cost of the heat exchange network modification; and the calculation time and the calculation cost are reduced, and the method is quick and effective.
Drawings
FIG. 1 is a general algorithm flow diagram;
FIG. 2 is a diagram of an existing heat exchange network;
fig. 3 is a diagram of a heat exchange network obtained by the present invention. The numbers below the heat exchanger numbers in the figure represent the heat exchange amount (area) in kW (m)2) (ii) a Italic numbers represent heat capacity flow rates in kW.deg.C-1。
Fig. 4 is a diagram showing a structure of a heat exchange network obtained by a conventional method.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, a heat exchange network area matching method based on one-to-one and two-to-two series connection, first, matching a single existing heat exchange area with a single required heat exchange area, that is, a cycle with G being 1 and G being 1, and if a recycling condition is that the required heat exchange area is (1 ± 5%) of the existing heat exchange area, recycling the existing heat exchanger if the condition is satisfied; secondly, matching two existing heat exchange areas with a single required heat exchange area, namely, circulation with G being 1 and G being 2, and recycling the two existing heat exchangers in a series connection mode if a recycling condition is that the required heat exchange area is 1 +/-5 percent of the sum of the two existing heat exchange areas; then, recycling is carried out in a mode of expanding a matching range by using a single existing heat exchange area and a single required heat exchange area, namely, G is 2, G is 1, the recycling condition is that the required heat exchange area is 20-110% of the existing heat exchange area, and if the condition is met, the existing heat exchanger is recycled; and finally, configuring a new heat exchanger for the residual elements which cannot be matched with the existing heat exchange area in the required area matrix.
Further, the method comprises the steps of:
step one, a required area matrix H is formedrThe elements in the formula (I) are arranged in ascending order according to the area size, and G is 1;
step two, making g equal to 1;
step three, let T be Tr＝Card{Hr}，TrMatrix H representing the desired heat transfer arearThe number of middle elements;
step four, judging whether g is equal to 1 or not, if so, AeFor existing heat exchange area matrix HeThe elements of (1); otherwise, HeThe elements in (A) are combined in pairs, and the sum of the existing areas is taken to form Ae；
Step five, finding the matrix H closest to the required arearThe tth element AtElement A of (A)eAnd let Δ a be at-Ae；
Step six, judging whether G is 1;
if G is 1, determining Δ A and AeWhether the ratio is between-5% and 5%; if so, the existing heat exchanger A is recycledeAnd separately At、AeCorresponding element is selected from HrAnd HeRemoving and updating TeValue of (A), Te＝Card{HeDenotes the existing heat exchange area matrix HeThe number of middle elements; otherwise, entering the next step;
if not, the user can not select the specific application,that is, G is not 1, then determine Δ A and AeWhether the ratio is within the range of-80% and 10%; if so, recycling AeCorresponding existing heat exchangers, and respectively At、AeCorresponding element slave matrix Hr、HeRemoving and updating TeA value of (d); otherwise, entering the next step;
step seven, judging whether T is larger than 1 or not, and TeG or more; if yes, enabling t to be t-1, and executing a step four; otherwise, entering the next step;
step eight, judging HrIf the data is an empty set, the matching is finished if the data is the empty set; otherwise, executing the next step;
step nine, judging whether g is equal to 1 or not, and TeGreater than 1; if yes, enabling g to be 2, and executing a step three; otherwise, entering the next step;
step ten, updating TrA value of (d);
step eleven, judging whether G is equal to 1 and T isrGreater than 0, TeGreater than 0; if so, enabling G to be 2, and executing a step two; otherwise, entering the next step;
step twelve, is HrAnd (5) configuring a new heat exchanger by using the residual elements, and completing matching.
Example (c): to better show the application effect of the present invention, the method of the present invention will now be described by way of example. This case consists of two hot streams, two cold streams, one hot utility and one cold utility. The material flow data is shown in a table 1, the data of the existing heat exchanger is shown in a table 2, and the structure diagram of the existing heat exchange network is shown in a figure 2. The total heat transfer coefficient of all heat exchangers is 0.1kW/m2The service life of the equipment is 2 years, the annual interest rate is 10 percent, and the annual factor of the investment cost is 0.576y-1. The cost of the newly added heat exchanger is 30000+750A0.81$ 3; the area cost of the prior heat exchanger is 750A0.81And $ 3. The utility consumption of the existing heat exchange network is 2720kW/y, and the annual operating cost is 181200 $/y.
TABLE 1
The simplified implementation steps are represented as follows:
in the first step, the required area is formed into a matrix HrIn ascending order of elements, Hr＝[103.8 162.4 256.2 393 486]. The existing heat exchange area matrix is He＝[268.7 217.2 256.2 358.9]。
In the second step, G is 1 and G is 1, matching a single required heat exchange area with a single existing heat exchange area. Find the nearest required area matrix HrIn AtElement A of (A)eLet Δ A be At-Ae. The specific cycle is as follows:
first cycle, t is 5, A5＝486，Ae＝358.9，ΔA＝486-358.9＝127.1；
Second cycle, t 4, A4＝393，Ae＝358.9，ΔA＝393-358.9＝34.1；
The third cycle, t is 3, A3＝256.2，Ae＝256.2，ΔA＝256.2-256.2＝0；
……
Determining Delta A and AeWhether the ratio of the heat exchange medium to the heat exchange medium is between-5% and 5%, if so, reusing the existing heat exchanger AeAnd separately At、AeSlave matrix HrAnd HeRemoving; otherwise, go to the next step. The specific operation is as follows:
first cycle, t is 5, Ae＝358.9，ΔA/Ae35.4% of 127.1/358.9, which does not meet the conditions and is not recycled;
second cycle, t 4, Ae＝358.9，ΔA/AeWhen the ratio is 34.1/358.9, the ratio is 9.5 percent, the condition is not met, and the recycling is not performed;
the third cycle, t is 3, Ae＝256.2，ΔA/Ae256.2/256.2 is 0%, the condition is satisfied, and the heat exchange area is 256.2m2The existing heat exchanger is recycled, and the area matrix becomes: he＝[268.7 217.2 358.9]，Hr＝[103.8 162.4 393 486]；
……
After the second step is executed, the area matrix is respectively changed into: he＝[268.7 217.2 358.9]，Hr＝[103.8 162.4 393 486]。
And step three, matching two existing heat exchange areas with a single required heat exchange area in a serial mode, wherein G is 1, and G is 2.
He＝[268.7 217.2 358.9]The number of elements is more than 1, and Hr＝[103.8 162.4 393 486]Is not empty, so HeIn pairs of elements Ae＝Ae1+Ae2＝268.7+217.2＝485.9，Ae＝Ae1+Ae2＝268.7+358.9＝627.6，Ae＝Ae1+Ae2358.9+217.2 576.1. Find the nearest required area matrix HrIn AtA of (A)e. I.e. t is 3, A3＝486，Ae485.9, and Δ a ═ at-Ae＝486-485.9＝0.1。
Determining Delta A and AeWhether the ratio is within the range of-5% and 5%. If yes, the existing heat exchanger A is recyclede1、Ae2And separately At、Ae1、Ae2From HeAnd HrAnd removing, otherwise, entering the next step. The specific operation is as follows:
Ae1＝268.7，Ae2＝217.2，Ae＝485.9，ΔA/Ae0.1/485.9 ═ 0.2%, Δ a and aeThe ratio is in the range of-5% and 5%, so two existing heat exchangers with heat exchange areas of 268.7, 217.2 are recycled, and the area matrix becomes: he＝[358.9]，Hr＝[103.8 162.4 393]。
Due to HeThe number of the medium element is 1, so the next step is carried out.
And fourthly, recycling the existing heat exchanger when G is 2 and G is 1, which are the matching of a single existing heat exchange area and a single required heat exchange area and meet the condition that the required heat exchange area is 20-110% of the existing heat exchange area. The specific operation is as follows:
first cycle, t is 3, A3＝393，Ae＝358.9，ΔA/Ae393-358.9)/358.9-9.5%, satisfying the condition, the recycling heat exchange area is 358.9m2Prior art heat exchanger of, and He＝[]，Hr＝[103.8 162.4]；
Due to HeEmpty, proceed to the next step.
The fifth step is HrThe rest elements are configured with new heat exchangers.
Hr＝[103.8 162.4]So that two areas are arranged to be 103.8m respectively2，162.4m2The new heat exchanger is matched.
The structure of the heat exchange network obtained by applying the method of the invention is shown in figure 3.
For comparison, the existing heat exchanger is matched by a common area matching method at present, and the required area matrix and the existing heat exchange area matrix are arranged in a descending order according to the element size, namely: hr＝[486 393 256.2 162.4 103.8]，He＝[358.9 268.7 256.2 217.2]And then, the existing equipment is recycled according to the standard that the required area is 20-110% of the area of the existing heat exchanger, difference is made in sequence, and matching is carried out, and the obtained area matching scheme is shown in table 2. Fig. 4 is a diagram showing a structure of a heat exchange network obtained by a conventional method.
The results of the heat exchange network modifications obtained using the new and conventional methods are shown in table 3.
TABLE 2
TABLE 3
It can be seen from table 2 and table 3 that, by applying the conventional method and the present invention to match the same required heat exchange area, the method requires fewer original heat exchangers to be modified, fewer heat exchange areas to be added, higher utilization rate of the old equipment (the area utilization rate of the conventional method is 80%, and the area utilization rate of the method is 100%), lower investment cost, and lower annual total cost, thereby realizing full utilization of the old equipment and reducing the investment cost of the heat exchange network modification. The method is used for optimizing and improving the heat exchange network, and the existing old heat exchange equipment is reasonably reused, so that compared with the original heat exchange network, the heat exchange network optimized and improved by the method saves 1568kW of public work consumption per year, saves 57.6% of energy consumption, and simultaneously reduces 56.2% of operating cost per year.
The above examples are provided only for illustrating the present invention and are not intended to limit the present invention. Any modification and variation of the present invention within the spirit of the present invention and the scope of the claims will fall within the scope of the present invention.
Claims (1)
1. A heat exchange network area matching method based on one-to-one and two-to-two series connection is characterized in that firstly, matching of a single existing heat exchange area and a single required heat exchange area is carried out, namely G is 1, G is 1, the recycling condition is that the required heat exchange area is 1 +/-5% of the existing heat exchange area, and the existing heat exchanger is recycled when the condition is met; secondly, matching two existing heat exchange areas with a single required heat exchange area, namely, circulation with G being 1 and G being 2, and reusing the heat exchange area in a serial mode if the reusing condition is that the required heat exchange area is 1 +/-5% of the sum of the two existing heat exchange areas; then, recycling the heat exchanger in a mode of expanding a matching range by using a single existing heat exchange area and a single required heat exchange area, namely, recycling G2 and G1, wherein the recycling condition is that the required heat exchange area is 20-110% of the existing heat exchange area, and if the condition is met, the existing heat exchanger is recycled; finally, configuring a new heat exchanger for the residual elements which cannot be matched with the existing heat exchange area in the required area matrix;
the method comprises the following steps:
step one, a required area matrix H is formedrThe elements in the formula (I) are arranged in ascending order according to the area size, and G is 1;
step two, making g equal to 1;
step three, let T be Tr＝Card{Hr}，TrMatrix H representing the desired heat transfer arearThe number of middle elements;
step four, judging whether g is equal to 1 or not, if so, AeFor existing heat exchange area matrix HeThe elements of (1); otherwise, HeThe elements in (A) are combined in pairs, and the sum of the existing areas is taken to form Ae；
Step five, finding the matrix H closest to the required arearThe tth element AtElement A of (A)eAnd let Δ a be at-Ae；
Step six, judging whether G is 1;
if G is 1, determining Δ A and AeWhether the ratio is between-5% and 5%; if so, the existing heat exchanger A is recycledeAnd separately At、AeCorresponding element is selected from HrAnd HeRemoving and updating TeValue of (A), Te＝Card{HeDenotes the existing heat exchange area matrix HeThe number of middle elements; otherwise, entering the next step;
if not, namely G is not 1, determining delta A and AeWhether the ratio is within the range of-80% and 10%; if so, recycling AeCorresponding existing heat exchangers, and respectively At、AeCorresponding element slave matrix Hr、HeRemoving and updating TeA value of (d); otherwise, entering the next step;
step seven, judging whether T is larger than 1 or not, and TeG or more; if yes, enabling t to be t-1, and executing a step four; otherwise, entering the next step;
step eight, judging HrIf the data is an empty set, the matching is finished if the data is the empty set; otherwise, executing the next step;
step nine, judging whether g is equal to 1 or not, and TeGreater than 1; if yes, enabling g to be 2, and executing a step three; otherwise, entering the next step;
step ten, updating TrA value of (d);
step eleven, judging whether G is equal to 1 and T isrGreater than 0, TeGreater than 0; if so, enabling G to be 2, and executing a step two; otherwise, entering the next step;
step twelve, is HrAnd (5) configuring a new heat exchanger by using the residual elements, and completing matching.
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