CN109871624B - Energy consumption analysis method and device after heat source transformation of heat-engine plant air heater - Google Patents
Energy consumption analysis method and device after heat source transformation of heat-engine plant air heater Download PDFInfo
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Abstract
The invention provides an energy consumption analysis method and device after heat source transformation of a heat engine fan heater of a thermal power plant, wherein the method comprises the following steps: calculating the extraction heat of the replacement turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified; calculating the change quantity of the heat consumption of the steam turbine caused by the extraction heat of the replacement steam turbine after the heat source of the air heater is modified; calculating the change quantity of the power consumption of the thermal power plant and the change quantity of the water consumption of the desulfurizing tower before and after the heat source of the air heater is modified; and obtaining the energy consumption change quantity before and after the heat source of the air heater is modified. The embodiment of the invention can analyze the energy consumption change before and after the heat source transformation of the thermal power plant, and the method is simple.
Description
Technical Field
The invention relates to the technical field of boiler flue gas waste heat utilization of a thermal power plant, in particular to an energy consumption analysis method and device after a heat source of a fan heater of the thermal power plant is transformed.
Background
The air heater is an important device of a thermal power plant in northern areas in China, is arranged on an air channel between a primary air fan, an air feeder and an air preheater and is used for heating the temperature of cold primary air and cold secondary air and playing a role in preventing or relieving the low-temperature corrosion of the air preheater. In recent years, with the investment of boiler denitration systems, the problems of blockage, corrosion and the like of an air preheater caused by ammonium bisulfate generated by the denitration system are increasingly prominent, and the improvement of the temperature of cold air entering the air preheater is an important feasible measure for relieving the problem, so that the importance of a fan heater is more prominent, and even a fan heater is specially added in some thermal power plants in southern China in China to improve the air temperature.
Fig. 1 is a schematic structural diagram of a boiler system of a thermal power plant before a fan heater is modified, and as shown in fig. 1, a heat source of a general air heater is auxiliary steam from a steam turbine side, and the auxiliary steam is extracted steam from the steam turbine, so that the investment of the air heater means the use of a large amount of auxiliary steam, namely the extracted steam of the steam turbine, and thus, the heat consumption rate of a steam turbine is increased, and further, the power supply coal consumption of a unit is increased. Therefore, in order to save energy, some power plants are modified to use the heat source of the air heater, the original auxiliary steam heating is changed into the method of using the waste heat of the flue gas to heat the circulating water and then using the heat of the circulating water to heat the cold air, a general flue gas waste heat utilization device is arranged on a flue behind an air preheater and in front of a dust remover, the flowing power of the circulating water is provided by a circulating water pump, the rising range of the temperature of the heated cold air can be adjusted by adjusting the rotating speed of the circulating water pump, the faster the rotating speed of the circulating water pump is, the more the temperature of the cold air rises, the slower the rotating speed is, and the less the temperature of the cold air rises. Fig. 2 is a schematic structural diagram of a thermal power plant boiler system with a modified warm air blower heat source. However, an analysis method for the energy consumption change before and after the heat source transformation of the thermal power plant is lacked at present.
Disclosure of Invention
The invention provides an energy consumption analysis method after heat source modification of a heat-engine plant air heater, which is used for analyzing the energy consumption change before and after heat source modification of the heat-engine plant and is simple, and the method comprises the following steps:
calculating the extraction heat of a replacement turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified;
calculating the change quantity of the steam turbine heat consumption caused by the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified;
calculating the change quantity of the power consumption of the thermal power plant and the change quantity of the water consumption of the desulfurizing tower before and after the heat source of the air heater is modified;
and obtaining the energy consumption change quantity before and after the heat source of the air heater is modified according to the change quantity of the heat consumption of the steam turbine caused by the extraction heat quantity of the steam turbine replaced by the heat source of the air heater after the heat source of the air heater is modified, the change quantity of the electric power used by the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption of the desulfurizing tower.
The invention provides an energy consumption analysis device after heat source modification of a heat-engine plant air heater, which is used for analyzing the variation of energy consumption before and after heat source modification of the heat-engine plant, and the method is simple, and the device comprises the following steps:
the first calculation module is used for calculating the steam extraction heat quantity of the replacement steam turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air before the heat source of the air heater is modified, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air after the heat source of the air heater is modified;
the second calculation module is used for calculating the change quantity of the steam turbine heat consumption caused by the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified;
the third calculation module is used for calculating the change amount of the power consumption of the thermal power plant and the change amount of the water consumption of the desulfurization tower before and after the heat source of the air heater is modified;
and the fourth calculation module is used for obtaining the energy consumption change before and after the air heater heat source is modified according to the change of the steam turbine heat consumption caused by the extraction heat of the substitute steam turbine after the air heater heat source is modified, the change of the thermal power plant electric power before and after the air heater heat source is modified and the change of the water consumption of the desulfurizing tower.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the method for analyzing the energy consumption of the heat source of the heat-engine plant air heater after the heat source is modified.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program for executing the method for analyzing the energy consumption of the modified heat source of the heat-engine plant air heater.
In the embodiment of the invention, according to the mass flow of primary air and the mass flow of secondary air when a unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air before the heat source of a heater is modified, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air after the heat source of the heater is modified, and the extraction heat quantity of a substitute turbine after the heat source of the heater is modified is calculated; calculating the change amount of the steam turbine heat consumption caused by the steam extraction heat of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat of the replacement steam turbine after the air heater heat source is modified; calculating the change quantity of the power consumption of the thermal power plant and the change quantity of the water consumption of the desulfurizing tower before and after the heat source of the air heater is modified; and obtaining the energy consumption change quantity before and after the heat source of the air heater is modified according to the change quantity of the heat consumption of the steam turbine caused by the steam extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, the change quantity of the electric power used by the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption quantity of the desulfurizing tower. According to the embodiment of the invention, the energy consumption change quantity before and after the heat source of the air heater is modified is finally obtained by calculating the extraction heat quantity of the alternative steam turbine after the heat source of the air heater is modified, calculating the change quantity of the steam turbine heat consumption caused by the extraction heat quantity of the alternative steam turbine after the heat source of the air heater is modified, calculating the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption of the desulfurization tower, so that the analysis on the change quantity of the energy consumption after the heat source of the air heater of the thermal power plant is modified is realized, and meanwhile, the calculation process is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
FIG. 1 is a heater system with auxiliary steam as a heat source;
FIG. 2 is a diagram of a fan heater system using waste heat of flue gas as a heat source;
FIG. 3 is a flowchart of an energy consumption analysis method after a heat source of a heat-engine plant air heater is modified according to an embodiment of the present invention;
fig. 4 is a schematic diagram of energy consumption analysis after a heat source of a heat-engine plant air heater is modified according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Energy consumption analysis after heat source transformation of a heat-engine plant air heater, namely, aiming at the air heater system which uses steam as a heat source before transformation in figure 1 and the air heater system which uses flue gas waste heat as a heat source after transformation, the change amount of the energy consumption of a unit in the heat-engine plant before and after transformation is analyzed, and the precondition for comparison before and after transformation is that under the rated load working condition of the unit, the operation parameters of a boiler are kept unchanged, namely, the change of main steam pressure and reheat steam pressure is not more than 2 percent, the change of main steam temperature and reheat steam temperature is within the range of 10 ℃, the change of the basic low-order calorific value of fuel receiving is not more than 10 percent, the change of the oxygen content at the inlet of an air preheater is not more than 0.5 percent, the heat source heating amount of the air heater is based on the maximum cold air temperature rise value when auxiliary steam is adopted for heating, and the temperature rise value of cold primary air at the moment is based on the maximum cold air temperature rise value
The temperature rise value of the cold secondary air is
And recording the working condition as a standard working condition before transformation.
Fig. 3 is a flowchart of an energy consumption analysis method after a heat source of a heat-engine plant air heater is modified in an embodiment of the present invention, and as shown in fig. 3, the method includes:
and 304, obtaining the energy consumption change quantity before and after the heat source of the air heater is modified according to the change quantity of the heat consumption of the steam turbine caused by the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, the change quantity of the electric power used by the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption quantity of the desulfurizing tower.
In the embodiment of the invention, the energy consumption change before and after the heat source of the air heater is modified is finally obtained by calculating the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, calculating the change quantity of the steam turbine heat consumption caused by the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, calculating the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption of the desulfurizing tower, and the analysis of the energy consumption change quantity after the heat source of the air heater of the thermal power plant is realized.
In one embodiment, according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is modified, the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified, and calculating the extraction heat of the substitute turbine after the heat source of the air heater is modified, may include:
if the maximum temperature rise value of the cold primary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold primary air after the heat source of the air heater is modified, and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified, calculating the steam extraction heat quantity of the replaced steam turbine after the heat source of the air heater is modified according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated;
if the maximum temperature rise value of the primary cold air before the heat source of the air heater is modified is larger than the maximum temperature rise value of the primary cold air after the heat source of the air heater is modified, and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified is larger than the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified, the extraction heat quantity of the alternative turbine after the heat source of the air heater is modified is calculated according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated in load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified.
During specific implementation, the mode of adopting the flue gas waste heat as the indirect heat source of the air heater is equivalent to replacing the original steam extraction of the steam turbine, so that the steam extraction of the steam turbine is reduced, and the heat consumption of the steam turbine is reduced. Assuming that all the extraction heat of the steam turbine in the original mode is transferred to the cold air and is converted into the temperature rise of the cold air, and the heat exchange efficiency is not considered, the heat absorbed by the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is transformed is the maximum extraction heat of the steam turbine. If the maximum temperature rise value of the cold primary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold primary air after the heat source of the air heater is modified, and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified, namely the flue gas waste heat after the heat source of the air heater is modified can be transferred to more heat of cold air, but the steam extraction heat of a steam turbine which can be replaced by the flue gas waste heat after the heat source of the air heater is modified is unchanged, so that the rotating speed of a circulating water pump of a flue gas waste heat utilization system needs to be adjusted at the moment to ensure that the maximum temperature rise value of the cold primary air is increased to the maximum temperature rise value of the cold primary air before the heat source of the air heater is modified, the maximum temperature rise value of the cold secondary air is increased to the maximum temperature rise value of the cold secondary air before the modification of the heat source of the air heater, the working condition is taken as a standard working condition after the modification, at the moment, in one embodiment, the following formula can be adopted, according to the mass flow of the primary air and the mass flow of the secondary air when the unit is under rated load, the constant pressure specific heat capacity of the primary air and the constant pressure specific heat capacity of the secondary air, the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air before the modification of the heat source of the air heater, the steam extraction heat quantity of the replacement steam turbine after the modification of the heat source of the air heater is calculated:
wherein the content of the first and second substances,
the heat of the steam extraction of the steam turbine is replaced after the heat source of the air heater is transformed;
q 1 and q is 2 Respectively the mass flow of primary air and the mass flow of secondary air when the unit is rated at load;
c p1 and c p2 Respectively the constant pressure specific heat capacity of the primary air and the constant pressure ratio of the secondary airHeat capacity;
If the maximum temperature rise value of the primary cold air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the primary cold air after the heat source of the air heater is modified, and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified, namely the heat transferred to cold air by the residual heat of flue gas after the heat source of the air heater is modified is smaller than the standard working condition before the heat source of the air heater is modified, in one embodiment, the following formula can be adopted, according to the mass flow of the primary air and the mass flow of the secondary air during the rated load of a unit, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified, and the extraction heat of a replacement turbine after the air heater is modified is calculated:
wherein, the first and the second end of the pipe are connected with each other,
the heat of the steam extraction of the steam turbine is replaced after the heat source of the air heater is modified;
q 1 and q is 2 Respectively the mass flow of primary air and the mass flow of secondary air when the unit is rated at load;
c p1 and c p2 Respectively is the constant pressure specific heat capacity of primary air and the constant pressure specific heat capacity of secondary air;
After obtaining the extraction heat quantity of the substitute turbine after the heat source of the air heater is modified, in an embodiment, the following formula may be used to calculate the change amount of the steam turbine heat consumption caused by the extraction heat quantity of the substitute turbine after the heat source of the air heater is modified according to the extraction heat quantity of the substitute turbine after the heat source of the air heater is modified:
wherein, the delta Q is the change quantity of the heat consumption of the steam turbine caused by the extraction heat of the substitute steam turbine after the heat source of the air heater is modified;
η SAH the steam extraction efficiency of the steam extractor used by the air heater when the set is rated for generating power;
P 0 the rated generating power of the unit;
q TB the steam turbine heat consumption rate under the standard working condition before the heat source of the air heater is transformed.
In an embodiment, calculating the change amount of the electric power of the thermal power plant before and after the modification of the heat source of the air heater may include:
calculating the change quantity of the power consumption of the circulating water pump before and after the heat source of the air heater is modified, the change quantity of the power consumption of the dust remover and the change quantity of the power consumption of the induced draft fan;
and obtaining the change of the electric power for the thermal power plant before and after the heat source of the air heater is modified according to the change of the electric power of the circulating water pump before and after the heat source of the air heater is modified, the change of the electric power of the dust remover and the change of the electric power of the induced draft fan.
During specific implementation, the power consumption of the circulating water pump after the heat source of the air heater is transformed is increased, and the power consumption of the circulating water pump can be calculated by adopting the following formula:
wherein, I sb Is the current of the circulating water pump;
U sb the voltage of the circulating water pump;
cos theta is the power factor of the circulating water pump motor, and is generally 0.85.
Due to the voltage U of the circulating water pump sb Is fixed, so the power consumption of the circulating water pump after the heat source of the air heater is improved is mainly increased due to the current I sb The change amount of the power consumption of the circulating water pump before and after the heat source of the air heater is transformed is as follows:
wherein, delta I sb The current increment of the circulating water pump is obtained;
ΔP sb the change amount of the power consumption of the circulating water pump before and after the heat source of the air heater is transformed.
During specific implementation, the change amount of the power consumption of the dust remover before and after the heat source of the air heater is transformed takes the change amount into consideration that the flue gas waste heat utilization device after the heat source of the air heater is transformed can reduce the temperature of flue gas. If the dust remover adopts the sack cleaner, this influence is very little, can ignore, if the dust remover adopts electrostatic precipitator or electric bag combination dust remover, the flue gas temperature reduces the specific resistance that can reduce the dust in the flue gas, improves the dust collection efficiency of electrostatic precipitator, reduces the power consumption of electrostatic precipitator when guaranteeing certain dust remover export smoke concentration. The power consumption of the dust remover can be obtained through tests, namely the power consumption of the dust remover is respectively measured under the standard working condition before modification and the standard working condition after modification, and the power consumption difference value of the two working conditions is the change quantity of the power consumption of the dust remover before and after modification of the heat source of the air heater.
During specific implementation, the electric power consumption of the induced draft fan after the heat source of the air heater is transformed is that the electric power consumption of the induced draft fan is changed due to the input of the waste heat utilization device, and the calculation formula of the electric power consumption of the induced draft fan is as follows:
P yf ＝q m p t /ρ/η
wherein q is m The mass flow of the flue gas of the induced draft fan;
p t the full pressure of the induced draft fan;
rho is the average flue gas density of an inlet and an outlet of the induced draft fan, the flue gas density change of the inlet and the outlet of the induced draft fan is small in practical application, and the rho can be taken as the flue gas density of the inlet of the induced draft fan;
η is the induced draft fan plant efficiency, assuming this term remains unchanged.
The change amount of the power consumption of the induced draft fan before and after the heat source of the air heater is transformed is considered in two aspects.
On the one hand, the flue gas mass flow q m Under the unchangeable condition, because the input of waste heat utilization equipment arouses draught fan entry and export flue gas temperature to reduce delta t and then lead to the flue gas density ρ to increase, cause the power consumption of draught fan to reduce, the change of the power consumption of draught fan this moment can be calculated by following formula:
on the other hand, the existence of the waste heat utilization device causes the increase of the flue resistance, namely the full pressure p of the induced draft fan t Causes an increase in the power consumption of the induced draft fan, the change Δ P of the power consumption yfLEp Can be obtained from the following formula:
wherein, Δ p t Can be measured by the test and is adorned with waste heat utilizationAnd obtaining the pressure difference between the inlet and the outlet.
Finally, the change amount of the power consumption of the induced draft fan before and after the heat source of the air heater is modified can be represented as follows:
ΔP yfLE ＝ΔP yfLEt +ΔP yfLEp
wherein, Δ P yfLE The change amount of the power consumption of the induced draft fan before and after the heat source of the air heater is transformed.
In one implementation, the following formula can be adopted to obtain the change amount of the power consumption of the thermal power plant before and after the modification of the heat source of the air heater according to the change amount of the power consumption of the circulating water pump before and after the modification of the heat source of the air heater, the change amount of the power consumption of the dust remover and the change amount of the power consumption of the induced draft fan:
ΔP＝(ΔP sb +ΔP ch +ΔP yfLE )/P 0
wherein, the delta P is the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified;
ΔP sb the change amount of the power consumption of the circulating water pump before and after the heat source of the air heater is modified;
ΔP ch the change amount of the power consumption of the dust remover before and after the heat source of the air heater is modified;
ΔP yfLE the change amount of the power consumption of the induced draft fan before and after the heat source of the air heater is reformed;
P 0 the rated generating power of the unit.
In an embodiment, the water consumption of the desulfurization tower after the heat source of the air heater is modified refers to the water consumption of the desulfurization tower in a wet desulfurization process, and the temperature of flue gas entering the desulfurization tower is reduced due to the input of the waste heat utilization device, so that the amount of spray water used for achieving a cooling effect in the desulfurization tower is reduced, and the effect of reducing the water consumption of the desulfurization tower is achieved. The amount of change in the water consumption of the desulfurization tower can be obtained by the following formula:
Δd s ＝d 0 /Δt 0 ×Δt
wherein d is 0 The water consumption of the desulfurizing tower under the standard working condition before transformation;
Δt 0 for removing sulfurThe temperature of the flue gas in the tower reduces the variation.
In an embodiment, the following formula may be adopted to obtain the change amount of energy consumption before and after the modification of the heat source of the air heater according to the change amount of the heat consumption of the steam turbine caused by the extraction heat of the steam turbine after the modification of the heat source of the air heater, the change amount of the electric power used by the thermal power plant before and after the modification of the heat source of the air heater, and the change amount of the water consumption of the desulfurizing tower:
wherein, delta e is the energy consumption change before and after the air heater heat source is modified;
delta Q is the change quantity of the heat consumption of the steam turbine caused by the extraction heat of the replacement steam turbine after the heat source of the air heater is modified;
delta P is the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified;
Δd s the amount of change of the water consumption of the desulfurizing tower before and after the heat source of the air heater is improved.
Based on the same inventive concept and the same inventive concept, the embodiment of the invention also provides an energy consumption analysis device after the heat source of the heat engine fan heater of the thermal power plant is transformed, as described in the following implementation. Because the principles for solving the problems are similar to the method for analyzing the energy consumption after the heat source of the air heater of the thermal power plant is modified, the implementation of the device can refer to the implementation of the method, and repeated parts are not described in detail.
Fig. 4 is a schematic diagram of an energy consumption analysis apparatus after a heat source of a heat-engine plant air heater is modified in an embodiment of the present invention, and as shown in fig. 4, the apparatus includes:
the first calculation module 401 is configured to calculate the extraction heat of the replacement turbine after the heat source of the air heater is modified according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature increase value of the primary cold air and the maximum temperature increase value of the secondary cold air before the heat source of the air heater is modified, the maximum temperature increase value of the primary cold air and the maximum temperature increase value of the secondary cold air after the heat source of the air heater is modified;
a second calculating module 402, configured to calculate, according to the steam extraction heat of the replacement turbine after the heat source of the air heater is modified, a change amount of steam turbine heat consumption caused by the steam extraction heat of the replacement turbine after the heat source of the air heater is modified;
a third calculating module 403, configured to calculate a change amount of power consumption of the thermal power plant and a change amount of water consumption of the desulfurizing tower before and after the heat source of the air heater is modified;
a fourth calculating module 404, configured to obtain the change amount of the energy consumption before and after the heat source modification of the heater according to the change amount of the heat consumption of the steam turbine caused by the extraction heat of the replacement steam turbine after the heat source modification of the heater, the change amount of the electric power used by the thermal power plant before and after the heat source modification of the heater, and the change amount of the water consumption of the desulfurizing tower.
In summary, in the embodiment of the present invention, according to the mass flow rate of the primary air and the mass flow rate of the secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature increase value of the cold primary air and the maximum temperature increase value of the cold secondary air before the heat source of the air heater is modified, the maximum temperature increase value of the cold primary air and the maximum temperature increase value of the cold secondary air after the heat source of the air heater is modified, and the extraction heat quantity of the replacement turbine after the heat source of the air heater is modified is calculated; calculating the change amount of the steam turbine heat consumption caused by the steam extraction heat of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat of the replacement steam turbine after the air heater heat source is modified; calculating the change quantity of the power consumption of the thermal power plant and the change quantity of the water consumption of the desulfurizing tower before and after the heat source of the air heater is modified; and obtaining the energy consumption change quantity before and after the heat source of the air heater is modified according to the change quantity of the heat consumption of the steam turbine caused by the steam extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, the change quantity of the electric power used by the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption quantity of the desulfurizing tower. The embodiment of the invention finally obtains the energy consumption change quantity before and after the heat source of the air heater is modified by calculating the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, calculating the change quantity of the steam turbine heat consumption caused by the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified, calculating the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption of the desulfurizing tower, realizes the analysis of the energy consumption change quantity after the heat source of the air heater of the thermal power plant is modified, and has simple calculation process.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for analyzing energy consumption of a heat-engine plant air heater after heat source transformation is characterized by comprising the following steps:
calculating the extraction heat of a replacement turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air after the heat source of the air heater is modified;
calculating the change amount of the steam turbine heat consumption caused by the steam extraction heat of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat of the replacement steam turbine after the air heater heat source is modified;
calculating the change quantity of the power consumption of the thermal power plant and the change quantity of the water consumption of the desulfurizing tower before and after the heat source of the air heater is modified;
obtaining the energy consumption change quantity before and after the heat source of the air heater is modified according to the change quantity of the heat consumption of the steam turbine caused by the extraction heat quantity of the replacement steam turbine after the heat source of the air heater is modified, the change quantity of the electric power used by the thermal power plant before and after the heat source of the air heater is modified and the change quantity of the water consumption of the desulfurizing tower;
aiming at a heater system which utilizes steam as a heat source before transformation and a heater system which utilizes flue gas waste heat as a heat source after transformation,analyzing the variation of energy consumption of the thermal power plant unit before and after modification, and comparing before and after modification under the rated load working condition of the unit under the premise that the operation parameters of the boiler are kept unchanged, namely the variation of main steam pressure and reheat steam pressure is not more than 2%, the variation of main steam temperature and reheat steam temperature is within the range of 10 ℃, the variation of fuel receiving basic low-level calorific value is not more than 10%, the variation of air preheater inlet oxygen is not more than 0.5%, the heating amount of a heat source of a heater is based on the maximum cold air temperature rise value when auxiliary steam is adopted for heating, and the temperature rise value of cold primary air at the moment is the maximum cold air temperature rise value p1 ΔtThe temperature rise value of the cold secondary air is s1 ΔtRecording as a standard working condition before modification;
according to the mass flow of the primary air and the mass flow of the secondary air when the unit is under rated load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the air heater heat source is transformed, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air after the air heater heat source is transformed, the extraction heat quantity of a replacement turbine after the air heater heat source is transformed is calculated, and the method comprises the following steps:
if the maximum temperature rise value of the cold primary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold primary air after the heat source of the air heater is modified, and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is modified is smaller than the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified, calculating the steam extraction heat quantity of the replaced steam turbine after the heat source of the air heater is modified according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated;
if the maximum temperature rise value of the cold primary air before the heat source of the air heater is modified is larger than the maximum temperature rise value of the cold primary air after the heat source of the air heater is modified, and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is modified is larger than the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified, calculating the steam extraction heat quantity of the replaced steam turbine after the heat source of the air heater is modified according to the mass flow of the primary air and the mass flow of the secondary air when the unit is rated;
the change of the power consumption of the thermal power plant before and after the heat source of the air heater is transformed is calculated, and the change comprises the following steps:
calculating the change quantity of the power consumption of the circulating water pump before and after the heat source of the air heater is modified, the change quantity of the power consumption of the dust remover and the change quantity of the power consumption of the induced draft fan;
obtaining the change amount of the electric power used by the thermal power plant before and after the heat source of the air heater is modified according to the change amount of the electric power used by the circulating water pump before and after the heat source of the air heater is modified, the change amount of the electric power used by the dust remover and the change amount of the electric power used by the induced draft fan;
calculating the extraction heat of the replacement steam turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the primary cold air and the maximum temperature rise value of the secondary cold air before the heat source of the air heater is modified by adopting the following formula:
SAH2 1 p1 p1 2 p2 s1 Q＝qcΔt+qcΔt
wherein the content of the first and second substances, SAH2 Qthe heat of the steam extraction of the steam turbine is replaced after the heat source of the air heater is transformed;
q 1 and q is 2 The mass flow of the primary air and the mass flow of the secondary air are respectively the mass flow of the primary air and the mass flow of the secondary air when the unit is rated at load;
c p1 and c p2 Respectively is the constant pressure specific heat capacity of primary air and the constant pressure specific heat capacity of secondary air;
Δt p1 and Δ t s1 Respectively obtaining the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air before the heat source of the air heater is reformed;
calculating the steam extraction heat quantity of the replacement steam turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air during the rated load of the unit, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified by adopting the following formula:
SAH2 1 p1 p2 2 p2 s2 Q＝qcΔt+qcΔt
wherein, Δ t p2 And Δ t s2 Respectively obtaining the maximum temperature rise value of the cold primary air and the maximum temperature rise value of the cold secondary air after the heat source of the air heater is modified;
calculating the change quantity of the steam turbine heat consumption caused by the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified according to the extraction heat quantity of the substitute steam turbine after the heat source of the air heater is modified by adopting the following formula:
wherein, the delta Q is the change quantity of the heat consumption of the steam turbine caused by the extraction heat of the substitute steam turbine after the heat source of the air heater is modified;
SAH2 Qthe heat of the steam extraction of the steam turbine is replaced after the heat source of the air heater is transformed;
η SAH the steam extraction efficiency of the steam extractor used by the air heater when the set is rated for generating power;
P 0 the rated generating power of the unit;
q TB the steam turbine heat consumption rate under the standard working condition before the heat source of the air heater is transformed.
The method comprises the following steps of obtaining the change amount of the power consumption of the thermal power plant before and after the heat source of the air heater is modified according to the change amount of the power consumption of the circulating water pump before and after the heat source of the air heater is modified, the change amount of the power consumption of the dust remover and the change amount of the power consumption of the induced draft fan by adopting the following formula:
ΔP＝(ΔP sb +ΔP ch +ΔP yfLE )/P 0
wherein, the delta P is the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified;
ΔP sb the change amount of the electric power of the circulating water pump before and after the heat source of the air heater is modified;
ΔP ch the change amount of the power consumption of the dust remover before and after the heat source of the air heater is modified;
ΔP yfLE the change amount of the power consumption of the induced draft fan before and after the heat source of the air heater is reformed;
P 0 the rated generating power of the unit;
the method comprises the following steps of obtaining the change of energy consumption before and after the air heater heat source is modified according to the change of steam turbine heat consumption caused by the extraction heat of a replacement steam turbine before and after the air heater heat source is modified, the change of electric power used by a thermal power plant before and after the air heater heat source is modified and the change of water consumption of a desulfurizing tower by adopting the following formula:
wherein, delta e is the energy consumption change before and after the air heater heat source is modified;
delta Q is the change quantity of the heat consumption of the steam turbine caused by the extraction heat of the replacement steam turbine after the heat source of the air heater is modified;
delta P is the change quantity of the power consumption of the thermal power plant before and after the heat source of the air heater is modified;
Δd s the change of the water consumption of the desulfurizing tower before and after the heat source of the air heater is transformed.
2. An energy consumption analysis device after heat source modification of a heat-engine plant air heater according to the energy consumption analysis method after heat source modification of a heat-engine plant air heater of claim 1, comprising:
the first calculation module is used for calculating the steam extraction heat quantity of the replacement steam turbine after the heat source of the air heater is modified according to the mass flow of primary air and the mass flow of secondary air when the unit is rated at load, the constant-pressure specific heat capacity of the primary air and the constant-pressure specific heat capacity of the secondary air, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air before the heat source of the air heater is modified, the maximum temperature rise value of cold primary air and the maximum temperature rise value of cold secondary air after the heat source of the air heater is modified;
the second calculation module is used for calculating the change quantity of the steam turbine heat consumption caused by the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified according to the steam extraction heat quantity of the replacement steam turbine after the air heater heat source is modified;
the third calculation module is used for calculating the change amount of the power consumption of the thermal power plant and the change amount of the water consumption of the desulfurization tower before and after the heat source of the air heater is modified;
and the fourth calculation module is used for obtaining the energy consumption change before and after the air heater heat source is modified according to the change of the steam turbine heat consumption caused by the extraction heat of the substitute steam turbine after the air heater heat source is modified, the change of the thermal power plant electric power before and after the air heater heat source is modified and the change of the water consumption of the desulfurizing tower.
3. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of claim 1 when executing the computer program.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of claim 1.
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