CN104896980A - Plate heat exchanger and thermodynamic system comprising plate heat exchanger - Google Patents
Plate heat exchanger and thermodynamic system comprising plate heat exchanger Download PDFInfo
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- CN104896980A CN104896980A CN201510325249.4A CN201510325249A CN104896980A CN 104896980 A CN104896980 A CN 104896980A CN 201510325249 A CN201510325249 A CN 201510325249A CN 104896980 A CN104896980 A CN 104896980A
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Abstract
The invention provides a plate heat exchanger and a thermodynamic system comprising the plate heat exchanger. The plate heat exchanger is used for condensing the dead steam of the steam turbine of the boiler thermodynamic system, and the condensate is fed into the boiler as boiler water supplement; the boiler thermodynamic system further comprises a central monitoring diagnosis system which is in data connection with a boiler DCS system and a steam turbine DCS system, and therefore, the operation key parameters of the boiler and the steam turbine can be analyzed and diagnosed to determine whether the boiler is efficient and safe in operation.
Description
Technical field
The invention belongs to field of heat exchangers, particularly relate to a kind of plate type heat exchanger and comprise the therrmodynamic system of plate type heat exchanger, belong to field of heat exchangers and the F22 field of F28D.
Background technology
Gasket seal between current heat exchange plate can make the repair and maintenance of plate type heat exchanger more rapid, can change pad on the spot quickly and easily.But this structure exists certain shortcoming and defect, when gasket seal is connected with plate, pad easily channels bit, depart from seal groove, the sealing function of pad is declined and causes leakage even to be lost efficacy, seriously affect the serviceability of plate type heat exchanger.
Combustion system DCS and the turbine generating system DCS majority of current all boilers are all independently run, and also there is not data interaction in the DCS system of multiple stage boiler room, make in boiler running process, to there is island of automation problem, simultaneously, existing Boiler DCS System is more the angle design exploitation from meeting normal operation and boiler abnormal protection, and for the monitoring of the boiler real time execution thermal efficiency, the relationship analysis of boiler replenishing water amount and boiler duty, and the energy consumption data of multiple stage parallel boiler and the thermal efficiency are to aspects such as mark analyses, lack on-line analysis diagnosis, boiler is caused often to be in the low state of the thermal efficiency, cause a large amount of thermal waste.
Summary of the invention
The present invention has only solved plate type heat exchanger with the gasket seal that same is new and has sealed bad problem, simultaneously, the present invention the combustion monitor Department of Automation of all for enterprise boilers is unified generating automated system be incorporated into an automatically-monitored platform of Centralized Monitoring, this platform can realize the automatic online analyzing and diagnosing to the various parameter of all boilers, solve the island of automation problem that existing boiler operatiopn exists, and realize the optimization and energy saving of boiler.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of plate type heat exchanger, described plate type heat exchanger comprises heat exchange plate, gasket seal, described gasket seal is arranged in the sealed groove of heat exchange plate, described sealed groove is trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, and be long limit below, the minor face position on two parallel limits of described trapezium structure arranges opening.
A kind of boiler thermodynamic system, described boiler thermodynamic system comprises boiler, steam turbine, generator 16, vapor-water heat exchanger, the steam that boiler produces passes through steam turbine, then generated electricity by generator, meanwhile, the exhaust steam after generating enters vapor-water heat exchanger, carry out heat exchange with the low-temperature receiver that comes in vapor-water heat exchanger, the condensed water of exhaust steam loops back boiler by circulating pump; Described boiler thermodynamic system also comprises CSRC diagnostic system, described CSRC diagnostic system and Boiler DCS System and steam turbine DCS system carry out data cube computation, to carry out analyzing and diagnosing to the operation emphasis parameter of boiler and steam turbine, judge whether highly effective and safe runs boiler.
A kind of boiler thermodynamic system, described boiler thermodynamic system comprises multiple stage boiler, for generation of steam, described multiple stage boiler carries out data cube computation with CSRC diagnostic system respectively, to carry out on-line analysis diagnosis and energy consumption data bidding assessment to the operation of boiler.
As preferably, described boiler has multiple, and each boiler carries out data cube computation with CSRC diagnostic system respectively.
As preferably, the data of monitoring comprise each the boiler amount of delivering coal, and produce quantity of steam, steam pressure and vapor (steam) temperature, pressure fan airflow pressure, air-introduced machine airflow pressure, CO/CO
2content, the real-time power consumption of boiler accessory machinery, boiler replenishing water amount, one or more in the information datas such as fire box temperature.
As preferably, described vapor-water heat exchanger is above-mentioned plate type heat exchanger.
As preferably, the flow participating in the heat exchanging fluid of heat exchange in described plate type heat exchanger is different, described plate type heat exchanger comprises heat exchange plate, it is characterized in that, in the heat exchange plate that flow is little, at least one by-passing parts is set, the flow path of the heat exchanging fluid flowing through heat exchange plate is divided at least two flow manifolds by described by-passing parts, by-passing parts arranges opening, make point Cheng Liudao in described heat exchange plate be cascaded structure, thus the heat exchanging fluid making flow little form S shape runner on heat exchange plate.
As preferably, heat exchange plate arranges ripple, and the height of ripple is different; On same plate, along the flow path of fluid, the wave height in same split channel raises gradually.
As preferably, the Opening length L1 of by-passing parts, the length of by-passing parts is L2, and flow manifold width W, then meet following relational expression:
L1/L＝a－b＊Ln(L1/W)－c＊(L1/W)；
Wherein L=L1+L2;
400 < L < 800mm, 80 < L1 < 140mm, 130 < W < 150mm; Ln is logarithmic function
0.17＜L1/L＜0.22，0.5＜L1/W＜1.1
0.18＜a＜0.21，0.014＜b＜0.016，0.0035＜c＜0.004。
As preferably, along the direction of fluid flowing, the width W of flow manifolds different on same plate constantly reduces.
Compared with prior art, plate type heat exchanger of the present invention and therrmodynamic system thereof have following advantage:
1) the present invention is by arranging the sealed groove of trapezium structure and gasket seal corresponding with it, can make sealed groove and gasket seal being entrenched togather tightly, avoid using adhesive, add the fastness of sealing.
2) the combustion system DCS of all for enterprise boilers and electricity generation system DCS is incorporated into an automatically-monitored platform of Centralized Monitoring, this platform can realize the tubularpH sensor to the various important parameter of all boilers, and inline diagnosis analysis is carried out to it, solve the island of automation problem that existing boiler operatiopn exists, and realize boiler energy-saving optimizing operation.
3) the present invention only realizes the unequal demand of hot and cold side liquid actual internal area with same plate change hermetically-sealed construction, and the plate type heat exchanger that assembles of these plates adopts the assembling form of one-sided adapter, can save very large installation and maintenance cost.
4) the present invention is by test of many times, obtains an optimum heat exchange plate optimum results, and is verified by test, thus demonstrate the accuracy of result.
5) develop the on-line analysis diagnostic system of boiler operatiopn and steam turbine power generation, realize boiler energy-saving and run, economize energy.
Accompanying drawing explanation
Fig. 1 is boiler thermodynamic system schematic diagram of the present invention;
Fig. 2 is that boiler combustion system of the present invention controls schematic diagram;
Fig. 3 is electricity generation system Automated condtrol schematic diagram;
Fig. 4 is plate type heat exchanger seal groove schematic diagram of the present invention;
Fig. 5 is gasket seal cross sectional representation of the present invention;
Fig. 6 is the plate type heat exchanger schematic diagram of a runner parallel connection;
Fig. 7 is the schematic diagram of the plate type heat exchanger of runner series connection;
Fig. 8 is the schematic diagram of plate type heat exchanger of the present invention point journey sheet structure;
Fig. 9 is the structural representation of plate type heat exchanger of the present invention point journey pad;
Figure 10 is the sheet structure schematic diagram of the fluid that plate type heat exchanger flow of the present invention is large;
Figure 11 is the structural representation of plate type heat exchanger of the present invention point journey plate;
Figure 12 is the scale diagrams of the plate type heat exchanger point journey plate of Fig. 8.
Reference numeral is as follows:
1 first fluid import, 2 first fluid outlets, 3 second fluid imports, 4 second fluid outlets, 5 end plates, 6 end plates, 7 flow manifolds, 8 flow seal grooves, 9 flow seal pads, 10 heat exchange plates, 11 flow manifolds, 12 flow manifolds, 13 gasket seals, 14 boilers, 15 steam turbines, 16 generators, 17 small pumps, 18 water circulating pumps, 19 vapor-water heat exchangers, 20 CSRC diagnostic systems, 21CO/CO
2content setting and Acquisition Instrument, 22CO/CO
2content measuring instrument, 23 Fan Regulation valves, 24 blower fans, 25 fuel flow rate control and regulation devices, 26 Fuel lances, 27 exit flues, 28 sealed grooves, 29 is protruding, and 30 is protruding, 31 openings.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Herein, if do not have specified otherwise, relate to formula, "/" represents division, "×", " * " represent multiplication.
A kind of boiler thermodynamic system, described boiler thermodynamic system comprises multiple stage boiler 14, and for generation of steam, described multiple stage boiler 14 carries out data cube computation with CSRC diagnostic system 20 respectively, to monitor the operation of boiler.
By the operation monitoring automated system of all boilers is incorporated into an automatically-monitored platform of Centralized Monitoring, i.e. CSRC diagnostic system 20, this platform can realize monitoring the automatic online of the various parameters of all boilers, solves the island of automation problem that existing boiler operatiopn exists.
Further, as shown in Figure 1, described boiler thermodynamic system comprises boiler 14, steam turbine 15, generator 16, vapor-water heat exchanger 19, the steam that boiler 14 produces, by steam turbine 15, is then generated electricity by generator 16, simultaneously, exhaust steam after generating enters vapor-water heat exchanger 19, and carry out heat exchange with the low-temperature receiver that comes in vapor-water heat exchanger 19, the condensed water of exhaust steam loops back boiler 14 by circulating pump 18.
As preferably, described boiler 14 has multiple, and accordingly, most circulating pumps 18 also has multiple.
As preferably, described vapor-water heat exchanger 19 has multiple, and described vapor-water heat exchanger 19 is multiple series connection or parallel-connection structure.
Described CSRC diagnostic system 20 carries out data cube computation, to monitor the operation of boiler and steam turbine with boiler 14 and steam turbine 15.
Fig. 1 just illustrates a boiler 14 and is connected with CSRC diagnostic system 20, and in fact, all boilers 14 are all connected with CSRC diagnostic system 20, because simplify reason, so all do not illustrate in the drawings.
Generating automated system of the operation monitoring Department of Automation of all boilers being unified is incorporated into an automatically-monitored platform of Centralized Monitoring, i.e. CSRC diagnostic system 20, this platform can realize, to the automatic online monitoring of the various parameters of all boilers and steam turbine, solving the island of automation problem that existing boiler generator operation exists.
Certainly, described boiler thermodynamic system also comprises water charging system, does not illustrate in accompanying drawing 1.
As preferably, as shown in Figure 2, described boiler 14 automatic system for monitoring comprises boiler combustion automatic system for monitoring, mainly comprises CO/CO
2content setting and Acquisition Instrument 21, CO/CO
2the control and regulation of content measuring instrument 22, Fan Regulation valve 23, blower fan 24, fuel flow rate device 25, Fuel lance 26.Described Fuel lance 26 one end connects boiler, adds fuel toward boiler furnace, and the other end connects fuel flow rate control and regulation device 25, described control and regulation device 25 and CSRC diagnostic system 20 data cube computation.Described blower fan 24 one end is connected with boiler, and be responsible for burner hearth blowing-in and combustion-supporting, one end is connected with Fan Regulation valve 23, and described Fan Regulation valve regulation enters the air quantity of blower fan, and described Fan Regulation valve 23 carries out data cube computation with CSRC diagnostic system 20.Described CO/CO
2content measuring instrument 22 is arranged in the exit flue 27 of boiler 14, for measuring CO and CO in flue gas
2content, described CO/CO
2content setting is connected CO/CO with Acquisition Instrument 21 one end
2content measuring instrument 22, the other end and CSRC diagnostic system 20 carry out data cube computation.Described CO/CO
2content setting and Acquisition Instrument 21 are for gathering CO/CO
2content data and setting data.
The monitor procedure of boiler combustion automatic system for monitoring is as follows:
During boiler combustion, unit interval combustion release CO volume content is V1, unit interval combustion release CO during burning
2volume content is V2.At CO/CO
2content sets and sets V1 when boiler normally runs in Acquisition Instrument 21
settingand V2
setting.In actual boiler running process, CSRC diagnostic system can according to CO/CO
2the data that content setting and Acquisition Instrument 21 gather control the fuel quantity of ventilation and conveying automatically.
Certainly, as preferably, also V1 can be set at CSRC diagnostic system 20
settingand V2
setting.
For the adjustment of CO content, if the content V1 of the CO measured
measure> V1
setting, then show that ventilation is inadequate, therefore CSRC diagnostic system can pass to Fan Regulation valve by increasing the instruction of ventilating, and increases air output by the aperture increasing Fan Regulation valve 23, if the V1 of the CO measured
measure< V1
setting, and the CO measured
2content V2
measure< V2
setting, then show that ventilation is too much, therefore CSRC diagnostic system can pass to Fan Regulation valve 23 by reducing the instruction of ventilating, and reduces air output by the aperture reducing Fan Regulation valve 23.
Certainly, alternatively, if the content V1 of the CO measured
measure> V1
setting, then show that fuel quantity is too much, therefore the instruction reducing fuel quantity can be passed to fuel flow rate control and regulation device 25 by CSRC diagnostic system, reduces fuel quantity, if the V1 of the CO measured by fuel flow rate control and regulation device 25
measure< V1
setting, and the CO measured
2content V2
measure< V2
setting, then show that fuel quantity is very few, therefore CSRC diagnostic system can pass to fuel flow rate control and regulation device 25 by increasing the instruction of fuel quantity, reduces fuel flow rate by fuel flow rate control and regulation device 25.
Certainly, to the adjustment of CO content, as preferably, above-mentioned two kinds of regulative modes can be used, to accelerate governing speed simultaneously.
For CO
2the adjustment of content, if the CO measured
2content V2
measure< V2
setting, show undercharge, therefore CSRC diagnostic system 20 can pass to fuel flow rate control and regulation device 25 by increasing the instruction of fuel quantity, reduces fuel flow rate by fuel flow rate control and regulation device 25.
For CO
2the adjustment of content is preferentially carry out when the content of CO meets setting value.
As preferably, if the CO measured
2content V2
measure< V2
setting, then show that ventilation is too much, therefore CSRC diagnostic system can pass to Fan Regulation valve 23 by reducing the instruction of ventilating, and reduces air output by the aperture reducing Fan Regulation valve 23.
Certainly, to CO
2above-mentioned two kinds of regulative modes, as preferably, can be used, to accelerate governing speed by the adjustment of content simultaneously.
As preferably, V1
settingand V2
settingit is a continuous print number range.I.e. V1
measure, V2
survey amountas long as in number range, even if meet the demands.
As preferably, can to CO, CO
2in each independently carry out Automated condtrol, such as only control CO or only control CO
2, or both control.
As preferably, the upper limit of CO and/or the alert data of lower limit and/or CO are set in CSRC diagnostic system 20
2lower limit alert data.Once exceed the data of the upper limit or lower limit, CSRC diagnostic system 20 has just sent alarm signal.This kind of situation shows to lose efficacy for the control of air output and fuel delivery, and possible boiler operatiopn goes wrong, and needs to overhaul at once.
As preferably, CO/CO in described flue gas
2content detection instrument adopts moral figure testo350Pro analytical instrument, and resistance to extreme temperature up to 500 DEG C, thus meets pyrometric requirement.
As preferably, each boiler develops steam vapor amount, steam pressure and vapor (steam) temperature, pressure fan airflow pressure, air-introduced machine airflow pressure, power of motor, boiler replenishing water amount, the information data transmission such as fire box temperature, to CSRC diagnostic system 20, realize the real time on-line monitoring of all boiler operation emphasis parameters
As preferably, described generating automated system comprises and regulates pressure and power output before the machine of described steam turbine according to generation load.
As preferably, described generating automated system comprises air output and the fuel quantity that the generation load collected regulates boiler, regulates the pushing quantity of boiler simultaneously.
As shown in Figure 3, CSRC diagnostic system gathers the output load of generator 16 to described generating automated system.As preferably, output load shows in real time.If need to increase output load, then CSRC diagnostic system sends instruction, increases air output and fuel quantity simultaneously, increase rate of water make-up simultaneously by the transmission power of small pump 17 by Fan Regulation valve 23 and fuel flow rate control and regulation device 25.Certainly, as preferably, also can increase by the increase of pump 18 power the quantity of circulating water entering boiler.Certain conduct is preferred, can increase power simultaneously accelerate regulating time by small pump 17 and water circulating pump 18.
If need to reduce output load, then CSRC diagnostic system 20 sends instruction, reduces air output and fuel quantity simultaneously, reduce rate of water make-up simultaneously by the transmission power of small pump 17 by Fan Regulation valve 23 and fuel flow rate control and regulation device 25.Certainly, also can reduce by pump 18 power reduction the quantity of circulating water entering boiler.Certain conduct is preferred, can reduce power simultaneously accelerate regulating time by small pump 17 and water circulating pump 18.
As preferably, if need to increase output load, then CSRC diagnostic system sends instruction, increases pressure and power output before the machine of described steam turbine.If need to reduce output load, then CSRC diagnostic system sends instruction, reduces pressure and power output before the machine of described steam turbine.
By above-mentioned Based Intelligent Control, the intelligent power generation of boiler can be realized, make boiler combustion and generator operation automation, improve the efficiency of monitoring.
Certainly, Fig. 3 is a schematic diagram, illustrate only small pump 17, and miscellaneous part shows in Fig. 1,2, this has been omission, and those skilled in the art record according to Fig. 1-3 can understand in conjunction with description.
As preferably, described vapor-water heat exchanger is plate type heat exchanger.Plate type heat exchanger adopts following structure:
A kind of plate type heat exchanger, described plate type heat exchanger comprises heat exchange plate 10, gasket seal 13, gasket seal 13 is between adjacent heat exchange plate 10, described gasket seal 13 is arranged in the sealed groove 28 of heat exchange plate 10 periphery, described sealed groove 28 is trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, be long limit below, the minor face position on two parallel limits of described trapezium structure arranges opening 31, described gasket seal 13 is the trapezium structure of working in coordination with sealed groove, described gasket seal 13 is put in sealed groove 28 from opening 31.
By arranging the sealed groove of trapezium structure and gasket seal corresponding with it, sealed groove and gasket seal being entrenched togather tightly can be made, avoid using adhesive, add the fastness of sealing.
As preferably, described trapezium structure is isosceles trapezoidal structure.
As preferably, described sealed groove 28 arranges protruding 29 in the inside on two limits, left and right, corresponding with it, the outer setting on two limits, left and right of the trapezium structure of gasket seal 13 and protruding 29 corresponding recesses.By said structure, what sealed groove and gasket seal were fitted together to is more firm, and sealing effectiveness is better.
As preferably, described sealed groove 28 arranges protruding 30 in the inside on the limit of bottom, corresponding with it, the outer setting on the limit of the bottom of the trapezium structure of gasket seal 13 and protruding 30 corresponding recesses.By said structure, what sealed groove and gasket seal were fitted together to is more firm, and sealing effectiveness is better.
As preferably, protruding 29 be triangle, and projection 30 is rectangle.
As preferably, described protruding 29 often arrange respectively multiple, individual as being preferably 3-5.
As preferably, the lower edge of triangular hill 29 is parallel with the limit of trapezoidal bottom.By such setting, can make that gasket seal 13 is installed and be more prone to, easy for installation.
As preferably, the angle on limit, two, trapezoidal left and right and long limit (i.e. the limit of bottom) is 40-70 °, is preferably 50-60 °.Length between trapezoidal height and minor face is 1:(2-4), be preferably 1:3.Such angle and length are set, the fastness be fitted together to will be considered on the one hand, the convenience installed will be considered on the one hand.Angle is less, highly higher, then install more difficult, but chimeric fastness is good, good sealing effect.Otherwise angle is larger, highly lower, then it is easier to install, but chimeric fastness is poor, and sealing effectiveness is poor.Above-mentioned angle and height are the effects considering the optimum obtained considering that installation convenience and chimeric fastness are carried out.
Generally, the cross-sectional area of plate-type heat exchanger slab both sides cold and hot fluid passage is that equal (Fig. 6 a).In such cases, if the flow of two kinds of fluids (referring to volume flow) is more or less the same, now the runner of same fluid can take the mode of parallel connection parallel to each other, as Fig. 6 a, now the coefficient of heat transfer of plate type heat exchanger two side liquid is more or less the same, and the whole heat exchanger coefficient of heat transfer is very high, and arrange like this can also make two kinds of fluids import and export all on an end plate 5, as shown in Figure 6 b, what be conducive to plate type heat exchanger disassembles maintenance and plate cleaning.If but when two kinds of larger fluids of flow difference carry out heat exchange, if two kinds of fluids all take fluid passage in parallel, then there will be too low compared with the flow velocity of low discharge, thus cause the lower coefficient of heat transfer.Therefore usual form low-flow fluid channel setting being become series connection, as shown in Figure 7a, so just cannot four of a cold fluid and hot fluid import and export be all arranged on an end plate, can only be arranged on two end plates 5,6, as shown in Figure 7b, two end plates all arrange fluid inlet and outlet connectors, when heat exchanger is in connection status with pipeline, plate type heat exchanger will dismantle difficulty, need two ends to dismantle, and cause maintenance inconvenience.
Following structure taked by plate type heat exchanger of the present invention, to adapt to vapour-liquid heat exchange.
As preferably, in the heat exchange plate 10 that described flow is little, at least one by-passing parts is set, the flow path of the heat exchanging fluid flowing through heat exchange plate is divided at least two points of Cheng Liudao 7 by described by-passing parts, and point Cheng Liudao 7 in described heat exchange plate 10 is cascaded structure.By the cascaded structure of above-mentioned point Cheng Liudao 7, make fluid therefore through all point Cheng Liudao 7, as shown in Figure 6, thus make heat exchanging fluid on heat exchange plate 10, form S shape runner.
By arranging by-passing parts, the fluid making flow little can be full of whole heat exchange plate, thus avoids the heat exchange area occurring some fluid short circuits, thus adds the coefficient of heat transfer, improves the coefficient of heat transfer of whole heat exchanger; In addition, by arranging by-passing parts, make the fluid of low discharge also can realize the parallel connection of the fluid passage in multiple plate, as shown in Figure 6 a, avoid the structure of little fluid channel setting for the series connection shown in Fig. 7 a to improve the coefficient of heat transfer, thus four of fluid import and export 1-4 can be made all to be arranged on same end plate, thus make easy to maintenance.
As preferably, the volume flow of large flow fluid is more than 2 times of the volume flow of low discharge fluid.
For vapor-water heat exchanger, as preferably, the plate of side, water source arranges by-passing parts.
As preferably, by-passing parts is realized by seal groove 8 and sealing gasket 9, and described seal groove 8 is arranged on heat exchange plate, by being inserted in seal groove 8 by sealing gasket 9, thus forms by-passing parts.
As preferably, by-passing parts is by directly arranging sealing strip to realize on heat exchange plate.As preferably, sealing strip and heat exchange plate integration manufacture.
On the fluid inlet of heat exchange plate and the two ends up and down of outlet, i.e. the two ends up and down of Fig. 3, by-passing parts is at one end closed, at the other end, opening is set, wherein along left and right directions, aperture position is disposed alternately at upper and lower two ends, ensures that fluid passage forms S shape like this.
Direction up and down mentioned before note that and is below not limited in using state be direction up and down, is only used to the structure of the plate of stating in Fig. 8 herein.
Plate described in Fig. 8,11 is because be provided with two by-passing parts, and therefore the import and export of fluid are arranged on top and bottom.Can certainly arrange 1 or odd number by-passing parts, the import and export position of fluid is now located on same one end, is namely positioned at upper end or lower end simultaneously.
Foregoing S shape runner can be half S shape, the situation of a by-passing parts is such as only set, also can be whole S shape, such as Fig. 8,11 form, also can be the combination of multiple S shapes and/or half S shape, such as, arrange the situation of 2 by-passing parts of being greater than, such as 3 by-passing parts be exactly the combination of 1 one S shapes and half S shape, 4 by-passing parts are exactly 2 S shapes, etc. by that analogy.
For adopting the form of sealing gasket, as preferably, the pad integrated design of the setting between sealing gasket and heat exchange plate for plate heat exchanger sheet, therefore present invention provides the pad used between heat exchange plate in plate type heat exchanger in.At least one flow seal pad 9 is set in described pad, the flow path of the heat exchanging fluid flowing through heat exchange plate is divided at least two points of Cheng Liudao 7 by described flow seal pad 9, a point Cheng Liudao 7 in described heat exchange plate 10 is cascaded structure, thus makes heat exchanging fluid on heat exchange plate 10, form S shape runner.
Finding in numerical simulation and experiment, by arranging by-passing parts, the heat exchanger coefficient of heat transfer can be made to increase, but also bring the increase of flow resistance simultaneously.Found by numerical simulation and experiment, for the width of flow manifold, if too small, flow resistance can be caused excessive, the pressure-bearing of heat exchanger is too large, and may produce runner dual-side interlayer and overlap along fluid flow direction, and causes the coefficient of heat transfer to decline, width of flow path is excessive also can cause the coefficient of heat transfer reducing plate type heat exchanger, therefore has a suitable numerical value for split channel 7; Length for by-passing parts opening also has certain requirement, if too small openings, the quantity that fluid can be caused to be flow through by opening is too small, stressedly reduce the coefficient of heat transfer in increasing simultaneously, in like manner, if excessive, then fluid can produce short-circuited region, do not have corresponding heat transfer effect, therefore have a suitable length for opening yet.Therefore between the length, flow manifold width of the Opening length of by-passing parts, by-passing parts, an optimized size relationship is met.
Therefore, the present invention is thousands of numerical simulations by the heat exchanger of multiple different size and test data, meeting in industrial requirements pressure-bearing situation (below 2.5MPa), when realizing maximum heat exchange amount, the dimensionally-optimised relation of the heat exchange plate of the best summed up.
As shown in Figure 7, the Opening length L1 of by-passing parts, the length of by-passing parts is L2, and flow manifold width W, then meet following relational expression:
L1/L＝a－b＊Ln(L1/W)－c＊(L1/W)；
Wherein L=L1+L2;
400 < L < 800mm, 80 < L1 < 140mm, 130 < W < 150mm; Ln is logarithmic function
0.17＜L1/L＜0.22，0.5＜L1/W＜1.1
0.18＜a＜0.21，0.014＜b＜0.016，0.0035＜c＜0.004。
Wherein Opening length is along by-passing parts, from the position that opening occurs along the position farthest reaching fluid passage, as the A point in Fig. 7.
As preferably, a=0.19, b=0.015, c=0.0037;
As preferably, along with the continuous increase of L1/W, the numerical value of a constantly reduces;
As preferably, along with the continuous increase of L1/W, the numerical value of b, c constantly increases.
As preferably, the flow velocity of the fluid of split channel is 0.4-0.8m/s, and preferably, 0.5-0.6m/s, the heat transfer effect taking above-mentioned formula to obtain under this flow velocity is best.
Preferably, the distance between plates 4-6mm of heat exchanging plate of heat exchanger, preferred 5mm.
For the form integrated with pad of the employing sealing gasket in Fig. 9, under also meeting above-mentioned formula situation, heat transfer effect is optimum.
As preferably, multiple by-passing parts is parallel to each other.
As preferably, along the direction (namely far away apart from the fluid intake of heat exchange plate) of fluid flowing, the width W of flow manifolds different on same heat exchange plate constantly reduces.Such as, the width of the flow manifold 7 in Fig. 8 is greater than flow manifold 11, and the width of flow manifold 11 is greater than flow manifold 12.Constantly being reduced by flow manifold width W to make fluid constantly accelerate, and avoids because the fluid caused that is short of power runs slowly.
As preferably, along the direction of fluid flowing, the width W of same flow manifold constantly reduces.Such as, in flow manifold 7, along fluid flow direction (namely Fig. 8 from top to bottom), width W constantly reduces.Now, for the W employing in preceding formula is mean breadth W.
As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is far away, and flow manifold width is less.Mainly distance entrance is far away, then distributing fluids is fewer, makes fluid ensure certain flow velocity by the change of width of flow path.
As preferably, heat exchange plate arranges ripple, and the height of ripple is different.On same plate, along the flow path of fluid, the wave height in same split channel raises gradually, and such as, in flow manifold 7, along fluid flow direction (namely Fig. 8 from top to bottom), wave height raises gradually.
As preferably, flow manifold distance heat exchange plate fluid intake distance is far away, and the height of the ripple in different flow manifold is higher, such as, wave height in flow manifold 7 in Fig. 8 is less than flow manifold 11, and the wave height of flow manifold 11 is less than flow manifold 12.
As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is far away, and wave height is higher.Mainly distance entrance is far away, then distributing fluids is fewer, makes fluid ensure certain flow velocity by the change of wave height.
As preferably, heat exchange plate arranges ripple, and the density of ripple is different.On same plate, along the flow path of fluid, the corrugation density in same split channel becomes large gradually, and such as, in flow manifold 7, along fluid flow direction (namely Fig. 8 from top to bottom), corrugation density becomes large gradually.
As preferably, flow manifold distance heat exchange plate fluid intake distance is far away, and the density of the ripple in different flow manifold becomes greatly.Such as, the corrugation density in the flow manifold 7 in Fig. 8 is less than flow manifold 11, and the corrugation density of flow manifold 11 is less than flow manifold 12
As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is far away, and corrugation density is larger.Mainly distance entrance is far away, then distributing fluids is fewer, makes fluid ensure certain flow velocity by the change of wave height.
As preferably, the amplitude that wave height noted earlier and/or density increase is more and more less.
As preferably, the gasket seal between sealing gasket 9 and/or heat exchange plate adopts elastomeric material.Described elastomeric material is made up of the raw material of following parts by weight: ethylene propylene diene rubber 7-9 part, butadiene-styrene rubber 3-6 part, zinc oxide 6-8 part, white carbon 13-15 part, promoter 4-5 part, blowing agent 2-8 part, naphthenic oil 5-6 part, titanium dioxide 20 parts, natural rubber 50-55 part, Lay mattress falls apart 10-13 part, silicon rubber 15-17 part, 2 parts, carborundum, Melamine 2 parts, 0.6 part to 1.5 parts, age resistor, softening agent 4 parts to 6 parts, vulcanizing agent 2.2 parts to 4 parts.
As preferably, ethylene propylene diene rubber 8 parts, butadiene-styrene rubber 5 parts, 7 parts, zinc oxide, white carbon 14 parts, promoter 4 parts, blowing agent 4 parts, naphthenic oil 6 parts, titanium dioxide 20 parts, natural rubber 52 parts, loose 12 parts of Lay mattress, 16 parts, silicon rubber, 2 parts, carborundum, Melamine 2 parts, 0.9 part, age resistor, softening agent 5 parts, vulcanizing agent 3 parts.
Manufacture method comprises the steps:
A. in banbury, add that described ethylene propylene diene rubber, butadiene-styrene rubber, zinc oxide, white carbon, promoter, blowing agent, naphthenic oil, titanium dioxide, natural rubber, Lay mattress are loose successively, silicon rubber, carborundum, Melamine and promoter and age resistor, then starting banbury, to carry out first time mixing, 70 seconds to 75 seconds time, temperature is 60 DEG C to 70 DEG C;
B. in the banbury of step A, adding softening agent, to carry out second time mixing, and 75 seconds time, temperature is less than 105 DEG C, then cools binder removal;
C. sulfuration: the glue of step B is discharged to and tablet press machine adds vulcanizing agent again turns refining, time 125-140 second, bottom sheet and get final product.
As preferably, promoter is diphenylguanidine.
As preferably, described promoter is dithiocar-bamate; Described age resistor is Tissuemat E; Described softening agent is paraffin; Described vulcanizing agent is curing resin.
Described rubber tool has the following advantages: 1) composite by the material of interpolation zinc oxide, titanium dioxide, resulting materials good springiness, and has certain hardness, and wear-resisting durable, the life-span is long, not easy to wear.2) owing to adopting Tissuemat E as antiaging agent, the persistence of rubber, hardness and abrasion resistance can be improved; 3) cure time is short, makes rubber become the large molecule of space network by the macromolecules cross-linking of linear structure, its anti-tensile of the rubber of output, surely stretch, wear-resisting performance is good.
Figure 10 illustrates the flow channel of the large fluid of flow, and in fact, for the present invention, two kinds of heat exchanging fluids can the little fluid of use traffic.Such as when heat exchange plate is certain, the flow of two kinds of fluids is all very little, and now the flow channel of two kinds of fluids can take the plate of Fig. 8, Figure 11 form.
Although the present invention discloses as above with preferred embodiment, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (5)
1. a plate type heat exchanger, described plate type heat exchanger comprises heat exchange plate, gasket seal, described gasket seal is arranged in the sealed groove of heat exchange plate, described sealed groove is trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, and be long limit below, the minor face position of described trapezium structure arranges opening.
2. a boiler thermodynamic system, described boiler thermodynamic system comprises boiler, steam turbine, generator 16, vapor-water heat exchanger, the steam that boiler produces is generated electricity by steam turbine drive electrical generators, simultaneously, exhaust steam after generating enters vapor-water heat exchanger, carries out heat exchange with the low-temperature receiver in vapor-water heat exchanger, and the condensed water of exhaust steam loops back boiler by circulating pump; Described boiler thermodynamic system also comprises CSRC diagnostic system, and described CSRC diagnostic system and Boiler DCS System and steam turbine DCS system carry out data cube computation, to carry out analyzing and diagnosing to the operational factor of boiler and steam turbine.
3. therrmodynamic system as claimed in claim 2, described boiler has multiple stage, and every platform boiler carries out data cube computation with CSRC diagnostic system respectively.
4. therrmodynamic system as claimed in claim 2 or claim 3, is characterized in that, the data of CSRC diagnostic system monitoring comprise each the boiler amount of delivering coal, and produce quantity of steam, steam pressure and vapor (steam) temperature, pressure fan airflow pressure, air-introduced machine airflow pressure, CO/CO
2content, the real-time power consumption of boiler accessory machinery, boiler replenishing water amount, one or more in the information datas such as fire box temperature.
5. the therrmodynamic system as described in one of claim 2-4, is characterized in that described vapor-water heat exchanger is the plate type heat exchanger in claim 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007703A (en) * | 2017-10-24 | 2018-05-08 | 合肥通用机械研究院 | A kind of diffusion welding (DW) compact heat exchanger sheet structure comprehensive performance evaluation method |
| CN113312743A (en) * | 2021-03-31 | 2021-08-27 | 宁夏京能宁东发电有限责任公司 | Thermal performance analysis system of steam turbine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881514Y (en) * | 2005-12-02 | 2007-03-21 | 海城市裕丰橡胶制品有限公司 | New structured of plate sealing groove of plate type heat exchanger |
| CN102495607A (en) * | 2011-12-19 | 2012-06-13 | 武汉大学 | Fossil power unit on-line performance monitoring method on basis of Symphony system |
-
2015
- 2015-07-01 CN CN201510325249.4A patent/CN104896980B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881514Y (en) * | 2005-12-02 | 2007-03-21 | 海城市裕丰橡胶制品有限公司 | New structured of plate sealing groove of plate type heat exchanger |
| CN102495607A (en) * | 2011-12-19 | 2012-06-13 | 武汉大学 | Fossil power unit on-line performance monitoring method on basis of Symphony system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007703A (en) * | 2017-10-24 | 2018-05-08 | 合肥通用机械研究院 | A kind of diffusion welding (DW) compact heat exchanger sheet structure comprehensive performance evaluation method |
| CN113312743A (en) * | 2021-03-31 | 2021-08-27 | 宁夏京能宁东发电有限责任公司 | Thermal performance analysis system of steam turbine |
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Effective date of registration: 20190808 Address after: 261061 Qinghe Garden Complex Building 2-2802, 5738 Dongfeng East Street, Beihai Community, Xincheng Street, Weifang High-tech Zone, Shandong Province Patentee after: Weifang Yibo Energy Technology Co., Ltd. Address before: 261061 Weida Garden, 5078 Dongfeng East Street, Weifang High-tech Zone, Shandong Province Patentee before: Zhao Liying |
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