CN104123446A - Design calculation method of distributed combined cooling heating and power (CCHP) system - Google Patents
Design calculation method of distributed combined cooling heating and power (CCHP) system Download PDFInfo
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- CN104123446A CN104123446A CN201410334582.7A CN201410334582A CN104123446A CN 104123446 A CN104123446 A CN 104123446A CN 201410334582 A CN201410334582 A CN 201410334582A CN 104123446 A CN104123446 A CN 104123446A
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Abstract
The invention discloses a design calculation method of a distributed combined cooling heating and power (CCHP) system. The design calculation method of the distributed CCHP system is characterized in that starting equipment and the model of one certain technological process of the distributed CCHP system are selected according to actual needs, and the atmospheric condition at the typical time point when the CCHP system is placed is used for conducting variable working condition correcting; the input/output relation between the equipment is used for conducting equipment connection selecting, meanwhile, the parameter loss of working media in pipeline transmission between the equipment are considered, equipment input working media are used for limiting selecting of equipment models, and variable working condition correcting is conducted on the equipment until the technological process scheme is achieved; a plurality of technological process schemes are combined to form a system scheme, and calculation of operation state and energy supply capacity of the equipment under scheme variable working conditions of the CCHP system is achieved. According to the design calculation method, a plurality of distributed CCHP systems can be flexibly designed, and operation out-of-limit under equipment variable working conditions due to the fact that models are selected according to equipment nominal parameters.
Description
Technical field
The invention belongs to distributed triple-generation system field, relate in particular to a kind of design and calculation method of distributed triple-generation system.
Background technology
Along with the continuous decline of world energy sources reserves, people more and more pay attention to energy problem.The energy supplying system that distributed triple-generation system is high as energy utilization rate, environmental pollution is little, receives increasing concern.
The energy crisis of 20 century 70s has caused the development of distributing-supplying-energy system.In general, distributed triple-generation system refers to that a kind of mode with dispersion is distributed near load source, can independently export the small-scale energy supplying system of electricity, hot and cold energy.It can be by electricity, heat, cold 3 kinds of energy requirements are effectively unified, realize energy cascade utilization, improve comprehensive utilization of energy rate.Current, distributed energy supply is greatly developed abroad.Although China's distributed energy supply is started late, also set up distributed triple-generation system engineering, distributed cold and heat CCHP will obtain develop rapidly in China.
Although there is now the design proposal of multiple distributed triple-generation system, lacked a kind of method for designing taking internal combustion engine or gas turbine as the distributed triple-generation system of main generating set.And, taking internal combustion engine or gas turbine in the cold-hot combined supply system of main generating set, due to the operation of internal combustion engine or gas turbine, affected by atmospheric conditions fairly obvious, they are easy to depart from declared working condition operation under different atmospheric conditions, between equipment connection pipeline, also there is fluid properties loss, thereby cause the variable parameter operation of whole distributed triple-generation system.So, under specific atmospheric conditions, when design distributed cold and heat CCHP scheme, only carry out lectotype selection according to equipment amount of exports definite value and likely there will be the out-of-limit situation of equipment operational factor when the equipment actual motion.Although existing at present, the variable working condition of distributed triple-generation system common equipment is calculated to research,, but lack a kind of general variable working condition computing method to distributed triple-generation system.
Summary of the invention
The object of the invention is to, considering taking internal combustion engine or gas turbine under the prerequisite of the distributed triple-generation system atmospheric conditions of living in of main generating set, propose a kind of flexibly, meet the distributed triple-generation system method for designing of equipment actual motion requirement, complete simultaneously the variable working condition of designed distributed triple-generation system is calculated, obtain each equipment running status and system energy supply ability.
Technical scheme of the present invention is that a kind of design and calculation method of distributed triple-generation system, comprises the following steps:
Step 1: design gas turbine or the internal combustion engine initial equipment as a certain technological process of distributed triple-generation system, and select according to the actual requirements initial unit type, as the higher level equipment of its subordinate equipment.
Step 2: temperature, humidity, the pressure parameter of selecting n typical time point of distributed triple-generation system institute applied environment, the generated output of combustion motor or gas turbine and output working medium are revised, and obtain gas turbine or internal combustion engine consume fuel flow, generated output, an output fluid properties n corresponding variable working condition value.
Step 3: the working medium that higher level equipment delivery outlet produces, except can be used for the part of heat supply, flows to subordinate equipment through corresponding working medium pipeline.Want to connect subordinate equipment according to the annexation of equipment room and each equipment output port and set up the working medium pipeline of corresponding number and be connected with higher level equipment delivery outlet, the working medium pipeline other end and subordinate equipment input port join.
Step 4: calculate working medium pipeline n group fluid properties, i.e. subordinate equipment input port the input fluid properties corresponding with subordinate equipment joint of setting up in step 3 under n typical time point.
Step 5: utilize the existing model of subordinate equipment and corresponding constraint, carry out the selection of subordinate equipment model.Select suitable equipment model, adjust working medium that each delivery outlet is delivered to subordinate equipment in the working medium allocation proportion being connected in working medium transmission pipeline with this delivery outlet, selected unit type must can normally be moved under n group input fluid properties, if there is not suitable subordinate equipment model, need re-start technical flow design.If do not need to re-start technical flow design, for each subordinate equipment, according to the n group fluid properties of its input port input, this equipment output port equipment fluid properties and other output parameter are revised, obtain n group modified value.
Step 6: judge according to subordinate equipment whether technical flow design finishes.If design finishes, execution step 7, otherwise using existing the subordinate equipment that must connect subordinate equipment delivery outlet as new higher level equipment, repeating step 3 is to step 6.
Step 7: repeating step 1, to step 6, can be set up many technological processes.By set up technological process combination, form distributed triple-generation system design proposal.
Step 8: generated output, heating power, the refrigeration work consumption of Computation distribution formula cooling heating and power generation system, obtain the energy supply ability of co-feeding system, obtain each equipment running status under variable working condition simultaneously.
According to the design and calculation method of a kind of distributed triple-generation system of such scheme, in described step 4, working medium flue gas is considered temperature, flow loss, working medium superheated vapor is considered temperature, pressure, flow loss, working medium saturated vapour is considered pressure, flow loss, and hot water is considered temperature, flow loss.
According to the design and calculation method of a kind of distributed triple-generation system of such scheme, in described step 6, judge that technical flow design finishes according to being: there is not delivery outlet or have the delivery outlet that can not connect subordinate equipment in all subordinate equipments described in described 5, and be not prepared as this delivery outlet design subordinate equipment, this technical flow design finishes.
According to the design and calculation method of a kind of distributed triple-generation system of such scheme, in described step 7, repeating step 1 is less by 1 than the number of technological process in distributed triple-generation system to the number of times of step 6.
According to the design and calculation method of a kind of distributed triple-generation system of such scheme, the generated output of all generating sets in co-feeding system scheme is added, obtain generated output, heating power and the refrigeration work consumption of co-feeding system, in distributed triple-generation system scheme, each equipment variable parameter operation parameter is obtained by correction result in step 5.
The design and calculation method of a kind of distributed triple-generation system proposed by the invention, its beneficial effect is: convenient, flexible, and consider the impact of atmospheric conditions on equipment, in design process, complete type selecting and variable working condition correction to equipment, avoid the equipment actual operation parameters that causes according to equipment type selection out-of-limit, completed the calculating to equipment running status and Functional Capability under designed system variable working condition simultaneously.
Brief description of the drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.Should be emphasized that, following explanation is only exemplary, instead of in order to limit the scope of the invention and to apply.
Fig. 1 has provided the whole implementation flow process of the inventive method, and concrete steps are as follows:
Step 1: design gas turbine or the internal combustion engine initial equipment as a certain technological process of distributed triple-generation system, and select according to the actual requirements initial unit type, as the higher level equipment of its subordinate equipment.Need, according to the desired energy supply ability of co-feeding system, to estimate number of units and the model of determining required gas turbine or internal combustion engine.
Step 2: temperature, humidity, the pressure parameter of selecting n typical time point of distributed triple-generation system institute applied environment, the generated output of combustion motor or gas turbine and output working medium are revised, and obtain gas turbine or internal combustion engine consume fuel flow, generated output, an output fluid properties n corresponding variable working condition value.
Step 3: the working medium that higher level equipment delivery outlet produces, except can be used for the part of heat supply, flows to subordinate equipment through corresponding working medium pipeline.Want to connect subordinate equipment according to the annexation of equipment room and each equipment output port and set up the working medium pipeline of corresponding number and be connected with higher level equipment delivery outlet, the working medium pipeline other end and subordinate equipment input port join.
Taking internal combustion engine or gas turbine as equipment and corresponding relation that the distributed triple-generation system of main generating set mainly comprises as shown in table 1.
The each equipment corresponding relation of table 1 distributed triple-generation system
When the delivery outlet that can not connect subordinate equipment in table 1 does not connect subordinate equipment, its output working medium is all used for heat supply.In addition, working medium flue gas is delivered to subordinate equipment by flue gas transmission pipeline, working medium superheated vapor is delivered to subordinate equipment by superheated vapor transmission pipeline, and working medium saturated vapour is delivered to subordinate equipment by saturated vapour transmission pipeline, and working medium hot water is delivered to subordinate equipment by hot water delivery pipe road.If it is superheated vapor that steam type lithium bromide refrigerator connects grade working medium of equipment output port output, superheated vapor must be converted into saturated vapour and enters in steam type lithium bromide refrigerator again, and reforming unit is calculated a part of doing steam type lithium bromide refrigerator meter variable working condition correction model in calculating.
The working medium that can be used for heat supply is hot water and steam (comprising saturated vapour and superheated vapor).In general, internal combustion engine or gas turbine flue gas subordinate equipment that delivery outlet connects are waste heat boiler, this delivery outlet can only be connected with an equipment, one is produced superheated vapor subordinate equipment that waste heat boiler connects is steam turbine, this delivery outlet can only be connected with an equipment, and steam that this waste heat boiler produces is not used for direct heating.
Step 4: calculate working medium pipeline n group fluid properties, i.e. subordinate equipment input port the input fluid properties corresponding with subordinate equipment joint of setting up in step 3 under n typical time point.
Working medium flue gas is considered temperature, flow loss, and working medium superheated vapor is considered temperature, pressure, flow loss, and working medium saturated vapour is considered pressure, flow loss, and hot water is considered temperature, flow loss.Specifically be calculated as follows:
(1) flue gas transmission pipeline
G
g2＝k
g％(1-k
gg％)G
g1 (1)
T
g2＝(1-k
gt％)T
g1 (2)
G
g2for flue gas transmission pipeline end flue gas flow, i.e. the input flue gas flow of subordinate equipment in this step, k
gfor working medium percentage distribution (%), be assigned to this ducted flue gas flow and account for higher level equipment delivery outlet and be transferred to the number percent of all subordinate equipment flue gas total flows, k
ggfor flow loss number percent (%), G
g1by flue gas transmission pipeline head end is connected a grade equipment output port flue gas flow, T
g2for flue gas transmission pipeline end flue-gas temperature, i.e. the input flue-gas temperature of subordinate equipment in this step, k
gtfor temperature loss number percent (%), T
g1by flue gas transmission pipeline head end is connected a grade equipment output port flue-gas temperature.
(2) superheated vapor transmission pipeline
G
s12＝k
s1％(1-k
s1g％)G
s11 (3)
T
s12＝(1-k
s1t％)T
s11 (4)
P
s12＝(1-k
s1p％)P
s11 (5)
G
s12for superheated vapor transmission pipeline end superheat steam flow, i.e. the input superheat steam flow of subordinate equipment in this step, k
s1for working medium percentage distribution (%), be assigned to this ducted superheat steam flow and account for the number percent of higher level equipment delivery outlet except heat supply external superheat steam flow, k
s1gfor flow loss number percent (%), G
s11by superheated vapor transmission pipeline head end is connected a grade equipment output port superheat steam flow, T
s12for superheated vapor transmission pipeline end superheat steam temperature, i.e. the input superheat steam temperature of subordinate equipment in this step, k
s1tfor temperature loss number percent (%), T
s11by superheated vapor transmission pipeline head end is connected a grade equipment output port superheat steam temperature, P
s12for superheated vapor transmission pipeline end superheated vapor pressure, i.e. the input superheated vapor pressure of subordinate equipment in this step, k
s1pfor pressure loss number percent (%), P
s11by superheated vapor transmission pipeline head end is connected a grade equipment output port superheated vapor pressure.
(3) saturated vapour transmission pipeline
G
s22＝k
s2％(1-k
s2g％)G
s21 (6)
P
s22＝(1-k
s2p％)P
s21 (7)
G
s22for saturated vapour transmission pipeline end saturated vapour flow, i.e. the input saturated vapour flow of subordinate equipment in this step, k
s2for working medium percentage distribution (%), be assigned to this ducted saturated vapour flow and account for the number percent of higher level equipment delivery outlet saturated vapour flow except heat supply, k
s2gfor flow loss number percent (%), G
s21by saturated vapour transmission pipeline head end is connected a grade equipment output port saturated vapour flow, P
s22for saturated vapour transmission pipeline end saturated vapour pressure, i.e. the input saturated vapour pressure of subordinate equipment in this step, k
s2pfor pressure loss number percent (%), P
s21by saturated vapour transmission pipeline head end is connected a grade equipment output port saturated vapour pressure.
(4) hot water delivery pipe road
G
w2＝k
w％(1-k
wg％)G
w1 (8)
T
w2＝(1-k
wt％)T
w1 (9)
G
w2for hot water delivery pipe road end hot water flow, in this step, be the input hot water flow of subordinate equipment, k
wfor working medium percentage distribution (%), be assigned to this ducted hot water flow and account for the number percent of higher level equipment delivery outlet hot water flow except heat supply, k
wgfor flow loss number percent (%), G
w1by hot water delivery pipe road head end is connected a grade equipment output port hot water flow, T
w2for hot water delivery pipe road end hot water temperature, i.e. the input hot water temperature of subordinate equipment in this step, k
wtfor temperature loss number percent (%), T
w1by hot water delivery pipe road head end is connected a grade equipment output port hot water temperature.
Step 5: utilize the existing model of subordinate equipment and corresponding constraint, carry out the selection of subordinate equipment model.Select suitable equipment model, adjust working medium that each delivery outlet is delivered to subordinate equipment in the working medium allocation proportion being connected in working medium transmission pipeline with this delivery outlet, selected unit type must can normally be moved under n group input fluid properties, if there is not suitable subordinate equipment model, need re-start technical flow design.If do not need to re-start technical flow design, for each subordinate equipment, according to the n group fluid properties of its input port input, this equipment output port equipment fluid properties and other output parameter are revised, obtain n group modified value.
Each unit type restriction on the parameters is considered as follows:
(1) Primary regulation extraction turbine
|G
st10-G
st10N|≤k
st1g％G
st10N (10)
|T
st10-T
st10N|≤k
st1t％T
st10N (11)
|P
st10-P
st10N|≤k
st1p％P
st10N (12)
G
st10for variable working condition steam extraction turbine input next time steam flow, T
st10for variable working condition steam extraction turbine input next time vapor (steam) temperature, P
st10for variable working condition steam extraction turbine input next time steam pressure, G
st10Nfor the specified input steam flow of Primary regulation extraction turbine, T
st10Nfor the specified input vapor (steam) temperature of Primary regulation extraction turbine, P
st10Nfor the specified input steam pressure of Primary regulation extraction turbine, k
st1gfor Primary regulation extraction turbine steam turbine input working medium flow limit coefficient (%), k
st1tprimary regulation extraction turbine input Temperature of Working limit coefficient (%), k
st1pfor Primary regulation extraction turbine input sender matter pressure limit coefficient (%).
G
st11≤G
st10-k
st1d％G
st10N (13)
G
st11for Primary regulation extraction turbine extraction opening is set extraction flow, G
st10for variable working condition steam extraction turbine input next time steam flow, G
st10Nfor the specified input steam flow of Primary regulation extraction turbine, k
st1dfor flowing through low pressure (LP) cylinder minimum steam flow restriction coefficient (%).
(2) secondary steam extraction turbine
|G
st20-G
st20N|≤k
st2g％G
st20N (14)
|T
st20-T
st20N|≤k
st2t％T
st20N (15)
|P
st20-P
st20N|≤k
st2p％P
st20N (16)
G
st20for secondary steam extraction turbine input steam flow under variable working condition, T
st20for secondary steam extraction turbine input vapor (steam) temperature under variable working condition, P
st20for secondary steam extraction turbine input steam pressure under variable working condition, G
st20Nfor secondary steam extraction turbine input steam flow, T
st20Nfor the specified input vapor (steam) temperature of secondary steam extraction turbine, P
st20Nfor the specified input steam pressure of secondary steam extraction turbine, k
st2gfor secondary steam extraction turbine steam turbine input working medium flow limit coefficient (%), k
st2tfor secondary steam extraction turbine input Temperature of Working limit coefficient (%), k
st2pfor secondary steam extraction turbine input sender matter pressure limit coefficient (%).
G
st21+G
st22≤G
st20-k
std2％G
st20N (17)
G
st21for secondary steam extraction turbine first order extraction opening is set extraction flow, G
st22for secondary steam extraction turbine second level extraction opening is set extraction flow, G
st20for secondary steam extraction turbine input steam flow under variable working condition, G
st20Nfor the specified input steam flow of secondary steam extraction turbine, k
st2dfor flowing through low pressure (LP) cylinder minimum steam flow restriction coefficient (%).
(3) extraction back pressure turbine
|G
stb0-G
stb0N|≤k
stbg％G
stb0N (18)
|T
stb0-T
stb0N|≤k
stbt％T
stb0N (19)
|P
stb0-P
stb0N|≤k
stbp％P
stb0N (20)
G
stb0for extraction back pressure turbine input steam flow under variable working condition, T
stb0for extraction back pressure turbine input vapor (steam) temperature under variable working condition, P
stb0for extraction back pressure turbine input steam pressure under variable working condition, G
stb0Nfor the specified input steam flow of extraction back pressure turbine, T
stb0Nfor the specified input vapor (steam) temperature of extraction back pressure turbine, P
stb0Nfor the specified input steam pressure of extraction back pressure turbine, k
stbgfor the back pressure type formula Turbine Steam turbine input working medium flow limit coefficient (%) of drawing gas, k
stbtfor extraction back pressure turbine input Temperature of Working limit coefficient (%), k
stbpfor extraction back pressure turbine input sender matter pressure limit coefficient (%).
G
stb1≤G
stb0-k
stbd％G
stb0N (21)
G
stb1for extraction back pressure turbine extraction opening is set extraction flow, G
stb0for extraction back pressure turbine input steam flow under variable working condition, G
stb0Nfor the specified input steam flow of extraction back pressure turbine, k
stbdfor flowing through low pressure (LP) cylinder minimum steam flow restriction coefficient (%).
(4) produce superheated vapor waste heat boiler
|G
hr1g-G
hr1gN|≤k
hr1g％G
hr1gN (22)
|T
hr1g-T
hr1gN|≤k
hr1t％T
hr1gN (23)
G
hr1s≥k
hr1d％G
hr1sN (24)
G
hr1gfor producing superheated vapor waste heat boiler input flue gas flow, T under variable working condition
hr1gfor producing superheated vapor waste heat boiler input flue-gas temperature, G under variable working condition
hr1sfor producing superheated vapor waste heat boiler output steam flow, G under variable working condition
hr1gNfor producing the specified input flue gas flow of superheated vapor waste heat boiler, T
hr1gNfor producing the specified input flue-gas temperature of superheated vapor waste heat boiler, G
hr1sNfor producing the specified output steam flow of superheated vapor waste heat boiler, k
hr1gfor producing superheated vapor waste heat boiler input working medium flow limit coefficient (%), k
hr1tfor producing superheated vapor waste heat boiler input Temperature of Working limit coefficient (%), k
hr2dfor preventing from producing superheated vapor waste heat boiler dry combustion method coefficient (%).
(5) produce saturated vapour waste heat boiler
|G
hr2g-G
hr2gN|≤k
hr2g％G
hr2gN (25)
|T
hr2g-T
hr2gN|≤k
hr2t％T
hr2gN (26)
G
hr2s≥k
hr2d％G
hr2sN (27)
G
hr2gfor producing saturated vapour waste heat boiler input flue gas flow, T under variable working condition
hr2gfor producing saturated vapour waste heat boiler input flue-gas temperature, G under variable working condition
hr2sfor producing saturated vapour waste heat boiler output steam flow, G under variable working condition
hr2gNfor producing the specified input flue gas flow of saturated vapour waste heat boiler, T
hr2gNfor producing the specified input flue-gas temperature of saturated vapour waste heat boiler, G
hr2sNfor producing the specified output steam flow of saturated vapour waste heat boiler, k
hr2gfor producing saturated vapour waste heat boiler input working medium flow limit coefficient (%), k
hr2tfor producing saturated vapour waste heat boiler input Temperature of Working limit coefficient (%), k
hr2dfor preventing from producing saturated vapour waste heat boiler dry combustion method coefficient (%).
(6) flue gas type lithium bromide refrigerator
|G
ac1g-G
ac1gN|≤k
ac1g％G
ac1gN (28)
|T
ac1g-T
ac1gN|≤k
ac1t％T
ac1gN (29)
G
ac1gfor flue gas type lithium bromide refrigerator input flue gas flow under variable working condition, T
ac1gfor flue gas type lithium bromide refrigerator input flue-gas temperature under variable working condition, G
ac1gNfor the specified input flue gas flow of flue gas type lithium bromide refrigerator, T
ac1gNfor the specified input flue-gas temperature of flue gas type lithium bromide refrigerator, k
ac1gfor flue gas type lithium bromide refrigerator input working medium flow limit coefficient (%), k
ac1tfor flue gas type lithium bromide refrigerator input Temperature of Working limit coefficient (%).
(7) steam type lithium bromide refrigerator
|G
ac2s-G
ac2sN|≤k
ac2g％G
ac2sN (30)
|P
ac2s-P
ac2sN|≤k
ac2p％P
ac2sN (31)
G
ac2sfor steam type lithium bromide refrigerator input flue gas flow under variable working condition, T
ac2sfor steam type lithium bromide refrigerator input flue-gas temperature under variable working condition, G
ac2sNfor the specified input flue gas flow of steam type lithium bromide refrigerator, T
ac2sNfor the specified input flue-gas temperature of steam type lithium bromide refrigerator, k
ac2sfor steam type lithium bromide refrigerator input working medium flow limit coefficient (%), k
ac2sfor steam type lithium bromide refrigerator input Temperature of Working limit coefficient (%).
(8) hot water lithium bromide refrigeration machine
|G
ac3w-G
ac3wN|≤k
ac3g％G
ac3wN (32)
|T
ac3w-T
ac3wN|≤k
ac3t％T
ac3wN (33)
G
ac3wfor hot water lithium bromide refrigeration machine input flue gas flow under variable working condition, T
ac3wfor hot water lithium bromide refrigeration machine input flue-gas temperature under variable working condition, G
ac3wNfor the specified input flue gas flow of hot water lithium bromide refrigeration machine, T
ac3wNfor the specified input flue-gas temperature of hot water lithium bromide refrigeration machine, k
ac3wfor hot water lithium bromide refrigeration machine input working medium flow limit coefficient (%), k
ac3wfor hot water lithium bromide refrigeration machine input Temperature of Working limit coefficient (%).
Step 6: judge according to subordinate equipment whether technical flow design finishes.If design finishes, execution step 7, otherwise, must connect the subordinate equipment of subordinate equipment delivery outlet as the higher level equipment of its subordinate equipment using existing, repeating step 3 is to step 6.
Judge that technical flow design finishes according to being: there is not delivery outlet or exist and can not connect the delivery outlet of subordinate equipment in all subordinate equipments described in step 5, and is not prepared as this delivery outlet design subordinate equipment, and this technical flow design finishes.
Step 7: repeating step 1, to step 6, can be set up many technological processes.By set up technological process combination, form distributed triple-generation system design proposal.
Repeating step 1 is less by 1 than the number of technological process in distributed triple-generation system to the number of times of step 6.In general, the technological process that alliance scheme comprises is 1 group or identical 2 groups, and every group comprises 2 technological processes, and the technological process in every group is except refrigeration machine number, and other is identical.
Step 8: generated output, heating power, the refrigeration work consumption of Computation distribution formula cooling heating and power generation system, obtain the energy supply ability of co-feeding system, obtain each equipment running status under variable working condition simultaneously.
Heating power calculates by the following method.
If hot water heating, heating power is
Q
wh＝G
whf
h(T
wh,P
wh) (34)
Q
whfor hot water heating power, G
whfor hot water heating flow, f
h(T
wh, P
wh) be hot water than enthalpy, it is by hot water temperature T
wh, hot water pressure P
whutilize water and steam physical property computing function to try to achieve, hot water temperature T
wh, hot water pressure P
whobtained by the correction result in step 5.
If superheated vapor heat supply, heating power is
Q
s1h＝G
s1hf
h(T
s1h,P
s1h) (35)
Q
s1hfor superheated vapor heating power, G
s1hfor superheated vapor is for heat flux, f
h(T
s1h, P
s1h) be that superheated vapor is than enthalpy, by superheat steam temperature T
s1h, superheated vapor pressure P
s1hutilize water and steam physical property computing function to try to achieve, superheat steam temperature T
s1h, superheated vapor pressure P
s1hobtained by the correction result in step 5.
If saturated vapour heat supply, heating power is
Q
s2h＝G
s2hf
h(P
s2h) (36)
Q
s2hfor saturated vapour heating power, G
s2hfor saturated vapour is for heat flux, f
h(P
s2h) be saturated vapour than enthalpy, it is by saturated vapour pressure P
s2hutilize water and steam physical property computing function to try to achieve, saturated vapour pressure P
s2hobtained by the correction result in step 5.
The generated output of equipment and refrigeration work consumption can directly be obtained by the correction result in step 5.
The generated output of all devices in co-feeding system scheme is added, just obtains the generated output of co-feeding system.In like manner try to achieve heating power and the refrigeration work consumption of co-feeding system.In distributed triple-generation system scheme, each equipment variable parameter operation parameter is obtained by correction result in step 5.
The design and calculation method of distributed triple-generation system shown in the present, utilizes equipment interface annexation to carry out distributed triple-generation system conceptual design, very flexible.And the present invention has taken into full account the impact of atmospheric conditions combustion motor or gas turbine, in design process, complete type selecting and variable working condition correction to equipment, avoid the equipment actual operation parameters that causes according to equipment type selection out-of-limit.Meanwhile, complete the calculating to equipment running status and energy supply ability under designed system variable working condition.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1. a design and calculation method for distributed triple-generation system, is characterized in that, the method comprises:
Step 1: design gas turbine or the internal combustion engine initial equipment as a certain technological process of distributed triple-generation system, and select according to the actual requirements initial unit type, as the higher level equipment of its subordinate equipment;
Step 2: temperature, humidity, the pressure parameter of selecting n typical time point of distributed triple-generation system institute applied environment, the generated output of combustion motor or gas turbine and output working medium are revised, and obtain gas turbine or internal combustion engine consume fuel flow, generated output, an output fluid properties n corresponding variable working condition value;
Step 3: the working medium that higher level equipment delivery outlet produces, except can be used for the part of heat supply, flow to subordinate equipment through corresponding working medium pipeline, want to connect subordinate equipment according to the annexation of equipment room and each equipment output port and set up the working medium pipeline of corresponding number and be connected with higher level equipment delivery outlet, the working medium pipeline other end and subordinate equipment input port join;
Step 4: calculate working medium pipeline n group fluid properties, i.e. subordinate equipment input port the input fluid properties corresponding with subordinate equipment joint of setting up in step 3 under n typical time point;
Step 5: utilize the existing model of subordinate equipment and corresponding constraint, carry out the selection of subordinate equipment model, select suitable equipment model, adjust working medium that each delivery outlet is delivered to subordinate equipment in the working medium allocation proportion being connected in working medium transmission pipeline with this delivery outlet, selected unit type must can normally be moved under n group input fluid properties, if there is not subordinate equipment model, need re-start technical flow design, if do not need to re-start technical flow design, for each subordinate equipment, according to the n group fluid properties of its input port input, this equipment output port equipment fluid properties and other output parameter are revised, obtain n group modified value,
Step 6: judge according to subordinate equipment whether technical flow design finishes, if design finishes, continue subsequent step, otherwise using existing the subordinate equipment that must connect subordinate equipment delivery outlet as new higher level equipment, repeating step 3 is to step 6;
Step 7: repeating step 1, to step 6, can be set up many technological processes, by set up technological process combination, forms distributed triple-generation system design proposal;
Step 8: generated output, heating power, the refrigeration work consumption of Computation distribution formula cooling heating and power generation system, obtain the energy supply ability of co-feeding system, obtain each equipment running status under variable working condition simultaneously.
2. the design and calculation method of a kind of distributed triple-generation system according to claim 1, it is characterized in that, in described step 4, working medium flue gas is considered temperature, flow loss, working medium superheated vapor is considered temperature, pressure, flow loss, working medium saturated vapour is considered pressure, flow loss, and hot water is considered temperature, flow loss.
3. the design and calculation method of a kind of distributed triple-generation system according to claim 1, it is characterized in that, in described step 6, judge that technical flow design finishes according to being: there is not delivery outlet or have the delivery outlet that can not connect subordinate equipment in all subordinate equipments described in described step 5, and be not prepared as this delivery outlet design subordinate equipment, this technical flow design finishes.
4. the design and calculation method of a kind of distributed triple-generation system according to claim 1, is characterized in that, in described step 7, repeating step 1 is less by 1 than the number of technological process in distributed triple-generation system to the number of times of step 6.
5. the design and calculation method of a kind of distributed triple-generation system according to claim 1, it is characterized in that, the generated output of all generating sets in co-feeding system scheme is added, obtain generated output, heating power and the refrigeration work consumption of co-feeding system, in distributed triple-generation system scheme, each equipment variable parameter operation parameter is obtained by correction result in step 5.
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