CN113033961B - Economic evaluation method of desulfurization synergist - Google Patents
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Abstract
The invention relates to a desulfurization synergist economy evaluation method, which comprises the following steps: firstly, a synergist adding characteristic test is carried out on a unit desulfurization system to obtain the desulfurization clean flue gas SO under different desulfurization synergist concentrations2Concentration and raw flue gas SO of desulfurization inlet2A synergist profile of concentration; and then making a full-combination desulfurization cost curve chart of different desulfurization synergist concentrations and slurry circulating pump combination operation modes. The invention has the beneficial effects that: the economic performance of the synergist can be quantitatively evaluated under different slurry circulating pump combination modes, polysulfide working conditions and complex combination working conditions of flexible change of the price of the synergist, and the application mode of the desulfurization synergist with extreme economic performance is found out, so that necessary conditions are provided for deep energy conservation and consumption reduction; the method is simple and visual in evaluation; the method is suitable for complex combination working conditions of different slurry circulating pump combination modes, polysulfide working conditions and flexible change of the price of the synergist; the automatic control is convenient to realize, and the adjustment workload of operators on duty is reduced.
Description
Technical Field
The invention belongs to the technical field of adding of desulfurization synergists, and particularly relates to an economic evaluation method of a desulfurization synergist.
Background
Coal-fired power generation is the most main thermal power generation mode in China at present, and coal-fired flue gas is desulfurized through a limestone-gypsum wet method, so that the coal-fired power generation system has the main advantages of mature technology, strong adaptability to coal loads and deep desulfurization potential. At present, after ultralow emission transformation, a desulfurization system is mature in structural design and performance optimization, and the desulfurization efficiency can reach a higher level, but a desulfurization slurry circulating pump is still the main power consumption equipment of the desulfurization system, the power consumption of the desulfurization slurry circulating pump accounts for 65-76% of the power consumption of the whole desulfurization system, and the power consumption under certain working conditions is higher.
In order to control the energy consumption of a desulfurization system, the optimal operation of a slurry circulating pump is generally realized by seeking an optimal slurry circulating pump combination mode under different working conditions by depending on operation experience at present. The optimized operation method has the major disadvantages that:
1. the liquid-gas ratio of the desulfurization reaction cannot be continuously adjusted by the feeding and withdrawing of the slurry circulating pump, and the deviation between the actually operated liquid-gas ratio and the optimal liquid-gas ratio is large;
2. the start and stop of the slurry circulating pump can generate large fluctuation on the pH value of the slurry in the absorption tower, and is not beneficial to the stable reaction in the absorption tower and the scaling prevention requirement of a system;
3. under the working condition of rapid fluctuation of unit load, the adjustment time for switching the combination mode of the slurry circulating pump is long, and automatic control is difficult to realize.
Some units adopt a high-pressure high-power slurry circulating pump variable-frequency speed regulation device, and can continuously control the liquid-gas ratio of the desulfurization reaction within a certain range to achieve the aim of saving energy. But the spraying layer is blocked and slurry is accumulated, the use reliability of the high-power frequency converter is insufficient, the initial investment is large and the like, so that the scheme is not applied on a large scale all the time.
The desulfurization synergist is also a desulfurization efficiency-improving idea which is generally applied at present. The main characteristic is that the method is carried out by aiming at the slurry mass transfer processThe device has the advantages of resistance reduction and efficiency improvement, applicability to the whole process, low use cost, use, flexibility and convenience, and no negative influence on a desulfurization system. The economic benefit of the synergist is an important factor for determining the application mode and the application amount of the synergist, and the economic benefit of the synergist can be controlled only by the experience of operators on duty without knowing the specific change rule of the synergist, SO that the excessive addition of the synergist often causes SO at a desulfurization outlet2Too low concentration or delayed addition of sulfur results in SO at the desulfurization outlet2And the instantaneous value of the concentration exceeds the standard. The economic efficiency of the synergist can be accurately evaluated by the following difficulties:
1. because working conditions such as sulfur content, load and the like of the unit change in real time, synergists with different concentrations are required to be added correspondingly;
2. The synergists with different concentrations also need to be combined with different slurry circulating pumps in a combination mode to consider the economy;
3. market price fluctuations for synergists present a diverse and complex situation for the evaluation of overall system economics.
In view of the defect that the economic evaluation of the prior desulfurization synergist cannot be specifically quantified and can only be controlled by operation experience, how to evaluate the economic efficiency of the desulfurization synergist is a difficult problem to be solved urgently in practical production, and the deep energy-saving and consumption-reducing work of a desulfurization system is greatly limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for evaluating the economic efficiency of a desulfurization synergist.
The economic evaluation method of the desulfurization synergist comprises the following steps:
step 2, making a full-combination desulfurization cost curve chart of different desulfurization synergist concentrations and slurry circulating pump combination operation modes;
step 3, obtaining a limit economic operation mode curve of the synergist in the whole process;
Step 3.1, desulfurizing the clean flue gas SO under different desulfurizing synergist concentrations obtained in the step 12Concentration and desulfurization of imported raw flue gas SO2Finding out the SO of the desulfurized clean flue gas from the characteristic curve chart of the synergist of the concentration2Raw flue gas SO of desulfurization inlet under target value of concentration control2The corresponding relation between the concentration and the concentration of the desulfurization synergist;
step 3.2, reacting the corresponding relation in the step 3.1 to the full-combination desulfurization cost curve diagram obtained in the step 2;
step 3.3, leading the raw SO gas at all working condition points along with the desulfurization inlet in the fully-combined desulfurization cost curve chart2The points with the lowest cost are connected when the concentration is changed to obtain the limit economic operation mode curve of the synergist in the whole process, which is the original flue gas SO2The concentration, different circulating pump combination forms and different desulfurization synergist concentration pre-judging curves are operated according to the curves to obtain the ultimate desulfurization economy;
step 3.4, making a cost curve in the full-combined desulfurization cost curve chart under the combined operation mode of each slurry circulating pump when no desulfurization synergist is fed;
step 4, in the full-combination desulfurization cost curve chart, comparing the limit economic operation mode curve of the synergist and the economic operation mode curve when the synergist is not added, and setting the original SO of the flue gas at the desulfurization inlet 2The cost difference at the concentration is taken as the economic benefit W of the desulfurization synergist at the moment:
W＝W2-W1
in the formula, W is the economic benefit W of the desulfurization synergist, and the unit is yuan/h; w2For setting the raw flue gas SO of the desulfurization inlet2Function value of full-combination desulfurization cost curve when no synergist is added under the concentration; w1For setting the raw flue gas SO of the desulfurization inlet2Function value of the extreme economic operation mode curve of the synergist at the concentration.
Preferably, step 1 specifically comprises the following steps:
step 1.1, determining a combined operation mode of the slurry circulating pumps (such as the combined operation of two slurry circulating pumps, the combined operation of three slurry circulating pumps and the combined operation of four slurry circulating pumps);
step 1.2, determining the concentration of the desulfurization synergist (such as 0ppm, 100ppm, 200ppm, 300ppm, 400ppm, 500ppm and the like);
step 1.3, establishing a plane rectangular coordinate system, and desulfurizing the original flue gas SO of the inlet2The concentration is taken as the abscissa, and the desulfurized clean flue gas SO is taken as2Concentration as ordinate;
step 1.4, measuring different desulfurization inlet raw flue gas SO under the working condition2Concentration (e.g., 1000 mg/m)3—1800mg/m3) The corresponding desulfurized clean flue gas SO in the pH value of desulfurized slurry of 5.2-5.62The concentrations are connected into a line and used as a synergist adding characteristic curve under the working condition;
step 1.5, under the combined operation mode of the slurry circulating pumps corresponding to the step 1.1, the concentration of the desulfurization synergist is reset to be three to five concentration values, and the correspondingly obtained synergist adding characteristic curves are divided into a group;
Step 1.6, adding a plurality of combined operation modes of the slurry circulating pump except the combined operation mode of the slurry circulating pump selected in the step 1.1, and returning to execute the step 1.2 to the step 1.5 after adopting one of the combined operation modes of the slurry circulating pump; and (3) after all slurry circulating pump combined operation modes are adopted, all the obtained synergist adding characteristic curves in the plane rectangular coordinate system jointly form a desulphurization synergist adding characteristic curve, and the more characteristic curves are obtained in tests, the more accurate the obtained economic operation control mode is.
Preferably, step 2 specifically comprises the following steps:
step 2.1, calculating the cost of continuously supplementing the synergist:
F1＝Fsynergist×(Q1+Q2)
In the above formula, F1The unit is yuan/h for continuously supplementing the cost of the synergist; q1The unit is kg/h for the outward discharge consumption of the synergist; q2The unit of the amount of the synergist for chemical degradation is kg/h; fSynergistIs the unit price of the synergist, and the unit is yuan/kg;
Q1＝2.125×Qflue gas×COriginal SO2×10-6/η1×CSynergist×10-6
In the above formula, Q1The unit is kg/h for the outward discharge consumption of the synergist; 2.125 is CaSO4And SO2136/64; qFlue gasIs the unit exhaust smoke flow rate in Nm3/h；COriginal SO2 For desulfurizing the imported raw flue gas SO2Concentration in mg/Nm3；η1Is the solid content of the gypsum slurry; cSynergistThe concentration of the desulfurization synergist is expressed in ppm;
Q2＝Csynergist×α×η2/24
In the above formula, CSynergistThe concentration of the desulfurization synergist is in ppm; alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; eta2The daily degradation consumption rate of the desulfurization synergist (determined according to the degradation performance of the synergist and can be obtained by tests);
α＝π×D2/4×H×ρ×10-6
in the above formula, alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; d is the diameter of the desulfurizing tower and is expressed in m; h is the slurry liquid level in the desulfurizing tower and the unit is m; rho is the density of the desulfurized slurry in kg/m3，π×D2The volume of slurry in the tower is multiplied by 4H;
step 2.2, calculating the cost of the slurry circulating pump:
F2＝F3+F4；
in the above formula, F2In order to increase the cost of a slurry circulating pump, the unit is yuan/h; f3The operation cost of a single slurry circulating pump is unit/h; f4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h;
F3＝P×Fprice of electricity
In the above formula, P is the operating electric power of a slurry circulating pump; fPrice of electricityThe price of electricity for power supply;
F4＝Qflue gas*PResistance device/3600/1000/η3/η4*FPrice of electricity
In the above formula, F4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h; q Flue gasIs the flow rate of the exhaust smoke of the unit in Nm3/h；PResistance deviceThe smoke resistance increased after the slurry circulating pump is put into use is expressed as Pa; eta3For inducing internal efficiency of the fan, eta4The mechanical efficiency of the induced draft fan is improved; fPrice of electricityThe unit is yuan/kwh for supplying power price;
step 2.3, the raw flue gas SO of the inlet is desulfurized2The concentration is an abscissa, the operation cost under different circulating pumps and synergist concentration combination modes is calculated according to the cost of the slurry circulating pump for increasing the feeding amount of the selected slurry circulating pump combination operation mode and the cost of the continuous supplementary synergist corresponding to the selected desulfurization synergist concentration, and the operation cost is taken as an ordinate to be taken as a planar rectangular coordinate system;
step 2.4, taking the SO as the original flue gas of the desulfurization inlet in a rectangular plane coordinate system according to the operation cost corresponding to the combination operation mode of the concentration of the selected desulfurization synergist and the slurry circulating pump2A line parallel to the horizontal axis within the concentration range; the combination mode of various circulating pumps and the concentration of the synergist is a group of straight lines parallel to the X axis.
Preferably, the desulfurization synergist concentration fixed in step 2 and the desulfurization cost generated in the combined operation mode of the slurry circulating pump are fixed values.
Preferably, the operating cost W in step 2.4 is the cost of the slurry circulation pump, or the cost of the slurry circulation pump plus the cost of the continuous synergist replenishment.
Preferably, the clean flue gas SO is desulfurized in step 3.12The target concentration control value is 35mg/m3；35mg/m3The higher the control is, the better the economical efficiency is, so the target value can be 35mg/m3(the emission balance is the clean flue gas SO of desulfurization2The target value of the concentration and the pH value of the desulfurization slurry are controlled together).
Preferably, the pH of the desulfurized slurry in step 1.4 assumes a fixed value of 5.3.
The invention has the beneficial effects that: the invention provides a quantitative evaluation method for the economy of a desulfurization system, which is suitable for various slurry circulating pumps, under the conditions of multiple sulfur content and flexible variation of the price of a synergist, and can realize quantitative evaluation of the economy of the synergist under the complex combination conditions of different slurry circulating pump combination modes, multiple sulfur content working conditions and flexible variation of the price of the synergist, so that a desulfurization synergist application mode with extreme economy is found out, and necessary conditions are provided for deep energy conservation and consumption reduction. The evaluation is simple and visual; the method is suitable for complex combination working conditions of different slurry circulating pump combination modes, polysulfide working conditions and flexible change of the price of the synergist; the automatic control is convenient to realize, and the adjustment workload of operators on duty is reduced.
Drawings
FIG. 1 is a graph of synergist addition characteristics;
FIG. 2 is a graph of operating costs for different combinations of circulating pumps and synergist concentrations;
FIG. 3 is a graph of the extreme economic operation of the synergist;
FIG. 4 is a graph of the ultimate economic operation after doubling the price of the synergist;
FIG. 5 is a graph of the extreme economic operation after one-half of the synergist price has dropped;
FIG. 6 is a flow chart of a desulfurization synergist economy evaluation method.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
The invention overcomes the defects that the economic evaluation of the prior desulfurization synergist can not be specifically quantified and can only be controlled by operation experience, provides a quantitative evaluation method for the economic efficiency of a desulfurization system, which is suitable for various slurry circulating pumps, more sulfur components and flexible price change of the synergist, and further finds out the application mode of the desulfurization synergist with extreme economic efficiency, thereby providing necessary conditions for deep energy conservation and consumption reduction.
As an example, as shown in fig. 6, a method for evaluating the economic efficiency of a desulfurization synergist specifically includes the following steps:
Step 1.1, determining a combined operation mode of the slurry circulating pumps (such as the combined operation of two slurry circulating pumps, the combined operation of three slurry circulating pumps and the combined operation of four slurry circulating pumps);
step 1.2, determining the concentration of the desulfurization synergist (such as 0ppm, 100ppm, 200ppm, 300ppm, 400ppm, 500ppm and the like);
step 1.3, establishing a plane rectangular coordinate system, and desulfurizing the original flue gas SO of the inlet2The concentration is taken as the abscissa, and the desulfurized clean flue gas SO is taken as2Concentration as ordinate;
step 1.4, measuring different desulfurization inlet raw flue gas SO under the working condition2Concentration (e.g., 1000 mg/m)3～1800mg/m3) The corresponding desulfurization clean flue gas SO within the pH value of 5.2-5.6 (a certain value is fixed as 5.3) of the desulfurization slurry2The concentrations are connected into a line and used as a synergist adding characteristic curve under the working condition;
step 1.5, under the combined operation mode of the slurry circulating pumps corresponding to the step 1.1, the concentration of the desulfurization synergist is reset to be three to five concentration values, and the correspondingly obtained synergist adding characteristic curves are divided into a group;
Step 1.6, adding a plurality of combined operation modes of the slurry circulating pump except the combined operation mode of the slurry circulating pump selected in the step 1.1, and returning to execute the step 1.2 to the step 1.5 after adopting one of the combined operation modes of the slurry circulating pump; until all slurry circulating pump combination operation modes are adopted, all the obtained synergist adding characteristic curves in the planar rectangular coordinate system jointly form a desulfurization synergist adding characteristic curve, and the more characteristic curves obtained in the test, the more accurate the obtained economic operation control mode is;
step 2, making a full-combination desulfurization cost curve chart of different desulfurization synergist concentrations and slurry circulating pump combination operation modes;
step 2.1, calculating the cost of continuously supplementing the synergist:
F1＝Fsynergist×(Q1+Q2)
In the above formula, F1The unit is yuan/h for continuously supplementing the cost of the synergist; q1The unit is kg/h for the outward discharge consumption of the synergist; q2The unit is kg/h for chemical degradation amount of the synergist; fSynergistIs the unit price of the synergist, and the unit is yuan/kg;
Q1＝2.125×Qflue gas×COriginal SO2×10-6/η1×CSynergist×10-6
In the above formula, Q1The unit is kg/h for the outward discharge consumption of the synergist; 2.125 is CaSO4And SO2136/64; q Flue gasIs the flow rate of the exhaust smoke of the unit in Nm3/h；COriginal SO2For desulfurizing the imported raw flue gas SO2Concentration in mg/Nm3；η1Is the solid content of the gypsum slurry; cSynergistThe concentration of the desulfurization synergist is expressed in ppm;
Q2＝Csynergist×α×η2/24
In the above formula, CSynergistThe concentration of the desulfurization synergist is expressed in ppm; alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; eta2The daily degradation consumption rate of the desulfurization synergist (determined according to the degradation performance of the synergist and can be obtained by tests);
α＝π×D2/4×H×ρ×10-6
in the above formula, alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; d is the diameter of the desulfurizing tower and is m; h is the slurry liquid level in the desulfurizing tower and the unit is m; rho is the desulfurized slurry density inIs kg/m3；π×D2The volume of slurry in the tower is multiplied by 4H;
step 2.2, calculating the cost of the slurry circulating pump:
F2＝F3+F4；
in the above formula, F2In order to increase the cost of a slurry circulating pump, the unit is Yuan/h; f3The operation cost of a single slurry circulating pump is unit/h; f4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h;
F3＝P×Fprice of electricity
In the above formula, P is the operating electric power of one slurry circulating pump; fElectricity priceThe unit is yuan/kwh for supplying power price;
F4＝QFlue gas*PResistance device/3600/1000/η3/η4*FPrice of electricity
In the above formula, F4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h; qFlue gasIs the flow rate of the exhaust smoke of the unit in Nm3/h；PResistance deviceThe smoke resistance increased after the slurry circulating pump is put into use is expressed as Pa; eta3For inducing internal efficiency of the fan, eta4The mechanical efficiency of the induced draft fan is improved; fElectricity priceThe unit is yuan/kwh for supplying power price;
step 2.3, the raw flue gas SO of the inlet is desulfurized2The concentration is an abscissa, the operation cost under different circulating pumps and synergist concentration combination modes is calculated according to the cost of the slurry circulating pump for increasing the feeding amount of the selected slurry circulating pump combination operation mode and the cost of the continuous supplementary synergist corresponding to the selected desulfurization synergist concentration, and the operation cost is taken as an ordinate to be taken as a planar rectangular coordinate system;
step 2.4, taking the SO as the original flue gas of the desulfurization inlet in a rectangular plane coordinate system according to the operation cost corresponding to the combination operation mode of the concentration of the selected desulfurization synergist and the slurry circulating pump2A line parallel to the horizontal axis within the concentration range; the concentration combination mode of various circulating pumps and the synergist is a group of straight lines parallel to the transverse axis; the operation cost W is increased by adding slurryThe cost of a circulating pump, or the cost of adding a slurry circulating pump and the cost of continuously supplementing the synergist;
Step 3, obtaining a limit economic operation mode curve of the synergist in the whole process;
step 3.1, desulfurizing the clean flue gas SO under different concentrations of the desulfurization synergist obtained in the step 12Concentration and raw flue gas SO of desulfurization inlet2Finding out the SO of the desulfurized clean flue gas from the characteristic curve chart of the synergist of the concentration2Raw flue gas SO of desulfurization inlet under target value of concentration control2The corresponding relation between the concentration and the concentration of the desulfurization synergist; desulfurizing and purifying flue gas SO2The target concentration control value is 35mg/m3；35mg/m3The higher the control is, the better the economical efficiency is, so the target value can be 35mg/m3(the emission balance is the clean flue gas SO of desulfurization2The target value of the concentration and the pH value of the desulfurization slurry are controlled together);
step 3.2, reacting the corresponding relation in the step 3.1 to the full-combination desulfurization cost curve diagram obtained in the step 2;
step 3.3, leading the raw SO gas at all working condition points along with the desulfurization inlet in the fully-combined desulfurization cost curve chart2The points with the lowest cost are connected when the concentration is changed to obtain the limit economic operation mode curve of the synergist in the whole process, which is the original flue gas SO2The concentration, different circulating pump combination forms and different desulfurization synergist concentration pre-judging curves are operated according to the curves to obtain the ultimate desulfurization economy;
Step 3.4, making a cost curve in a full-combination desulfurization cost curve chart in a combined operation mode of all slurry circulating pumps when no desulfurization synergist is fed;
step 4, in the full-combination desulfurization cost curve chart, comparing the limit economic operation mode curve of the synergist and the economic operation mode curve when the synergist is not added, and setting the original SO of the flue gas at the desulfurization inlet2The cost difference at the concentration is taken as the economic benefit W of the desulfurization synergist at the moment:
W＝W2-W1
in the formula, W is the economic benefit W of the desulfurization synergist, and the unit is yuan/h; w is a group of2For setting the raw flue gas SO of the desulfurization inlet2Function value of full-combination desulfurization cost curve when no synergist is added under the concentration; w1For setting the raw flue gas SO of the desulfurization inlet2The value of the function of the extreme economic operating mode curve of the synergist at the concentration.
One boiler is a 500-ton steam extraction back pressure type coal-fired heat supply generator set. The boiler is an open-air arrangement boiler with high temperature and high pressure, natural circulation, single steam pocket, n-shaped arrangement, single hearth four-corner tangential combustion, balanced ventilation, solid-state deslagging, water spraying temperature reduction and all-steel framework suspension structure. The maximum continuous evaporation capacity of the boiler is 500t/h, and the minimum stable combustion load is 200 t/h. The diameter of the desulfurization absorption tower is 8.2m, the operating liquid level is 8.5m, and the parameters of the slurry circulating pump are as follows in the following table 1:
TABLE 1 slurry circulating pump parameter table
| Index (es) | 3A slurry circulating pump | 3B slurry circulating pump | 3C slurry circulating pump | 3D slurry circulating pump |
| Lift m | 18 | 20 | 22 | 24 |
| Flow rate m3/h | 2900 | 2900 | 2900 | 2900 |
| Rated current A | 32.1 | 32.1 | 35.2 | 39.1 |
First, desulfurization synergist addition characteristic curve
The test conditions are as follows: the main steam flow is 496.6t/h, the pH control range is 5.29-5.34, and the raw flue gas contains S02The concentration is 1100-1750 mg/m3(the sulfur content interval of the common coal is determined according to the test condition, and the data outside the test range is estimated), and the density of the absorption tower is 1119-1128 kg/m3The liquid level of the absorption tower is 7.22-7.4 m, the FGD inlet temperature is 99.8-102.2 ℃, and the density of limestone slurry is 1235-1248.6 kg/m3. Designing test data according to the step 1, and drawing a desulfurization synergist addition characteristic curve chart under different pump combination modes and typical desulfurization synergist concentrations as shown in figure 1;
secondly, determining the operation cost under different circulating pumps and synergist concentration combination modes
The operation cost of the combination mode of the circulating pump and the synergist concentration comprises the operation cost of the circulating pump and the cost of the continuous adding of the synergist. The operation cost of the two slurry circulating pumps is taken as the base cost T, and the operation cost of the circulating pumps is discussed by increasing the cost after the circulating pumps are added.
1. The operating cost of the circulating pump:
according to the power of 280kw of a single circulating pump and the power price of 0.4 yuan/kwh, the electricity fee F per hour 3Is 112 yuan; according to the flue gas flow rate of 543886m3The resistance of a single circulating pump is 400Pa, and the calculation in the step 2 shows that the fan increases the electricity charge F per hour4Comprises the following steps:
543886*400/3600/1000/0.85/0.98*0.4＝2902 yuan, namely adding one slurry circulating pump to increase the cost F2112+29.02 ═ 141.02 yuan/h; wherein 0.85 and 0.98 are respectively the internal efficiency and the mechanical efficiency of the induced draft fan; 3600 is a unit conversion factor of hour to second; 1000 is the unit scaling factor for w to kw;
2. the continuous adding cost of the synergist is as follows:
the consumption of the synergist mainly comprises the outward discharge consumption of the synergist and the chemical degradation of the synergist, and taking the synergist with the concentration of 400ppm as an example, the continuous adding cost of the synergist is as follows: 19.8*(136/64*543886*1630*10-6/0.2*400*10-6+400 × 0.5 × 0.4/24) ═ 140.6 yuan/h, where the daily synergist degradation rate is 0.4, synergist price is 19.8 yuan/kg, raw flue gas SO2The concentration is 1630mg/m3Measuring 543886m of flue gas flow3And h, neglecting the cost of the synergist for the first time. 136. 64 are each CaSO4And SO2The ratio of the two is 2.125, 0.2 is the solid content of the taken desulfurization slurry, 400ppm is the concentration of the synergist in the tower, 0.5 is the conversion coefficient of the holding amount of the synergist in the tower and the concentration of the synergist, and 24 is the conversion of the daily degradation amount to hours.
The operating costs for the combination of the concentrations of the other synergists, in terms of 400ppm concentration, are shown in particular in FIG. 2.
Thirdly, limit economic operation curve of synergist in whole process
FIG. 3 is an economic operating curve for a synergist price of 19.8 yuan/kg, as shown in FIG. 3, where the cost curves for four concentrations of 0(AB), 200ppm (triangle line), 400ppm (circle line), and 600ppm (square line) are identified in FIG. 3; according to the change of BC line in the figure, the original SO2The concentration of the flue gas is 1000-1600 mg/m3When changing, the synergist concentration needs to be slowly transited from 0ppm to 400ppm (concentration and raw flue gas SO)2The correspondence of the concentrations is determined from fig. 1);
curve BCG in the figure is for controlling the clean flue gas SO2The concentration is 35mg/m3The cost change curve of the combination of two slurry circulating pumps and different concentrations of the synergist is obtained; curve DE for controlling clean flue gas SO2The concentration is 35mg/m3The cost of combining three slurry circulating pumps and different synergist concentrations is changedAnd (4) forming a curve. In fig. 3, from the principle of lowest operation cost, it can be directly seen that curve ABCDE is the maximum economic operation curve of the synergist in the whole desulfurization process, and the specific control concept is as follows: 1. the AB section is provided with two slurry circulating pumps and operates without a synergist; 2. BC is the operation of two slurry circulating pumps and a synergist with specified concentration (0-400 ppm); 3. CD is three slurry circulating pumps and runs without a synergist; 4. DE for three slurry circulating pumps + synergist at specified concentration, the test range of this example is raw flue gas SO 2The concentration is 1000-1750 mg/m3In the middle (sulfur division interval of common coal), the data outside the test range is estimated according to the test condition, DE exceeds the test capability range, and the curve analysis is used for estimation reference.
In real production life, the price of the desulfurization synergist may change, so the limit operation curve of the synergist needs to be corrected in time, and the operation control mode may be different as shown in fig. 4 and fig. 5:
1. the price of the synergist is doubled (figure 4)
According to the change of BC line in the figure, the original SO2The concentration of the flue gas is 1000-1400 mg/m3When the concentration of the synergist is changed, the concentration of the synergist needs to be slowly transited from 0ppm to 200ppm (the concentration and the original SO of flue gas)2The correspondence of the concentrations is determined from fig. 1); the test range of the embodiment is the raw flue gas SO2The concentration is 1000-1750 mg/m3The data outside the test range is presumed according to the test condition, DE already exceeds the test ability range, and the curve analysis is used for presuming reference; BC is the concentration of the synergist which is added from 0ppm of two circulating pumps; DE is the synergist concentration from 0ppm of three circulation pumps up. DE working condition is beyond the test capability range, and curve analysis is used for estimation reference;
When the price of the synergist is increased, the cost curve of the synergist is moved upwards, and the balance point C is moved leftwards along with the cost curve of the synergist. FIG. 4 is a plot of the ultimate economic operation when the synergist price is doubled. It can be directly seen from fig. 4 that the curve ABCDE is still a synergist limit economic operation curve in the whole desulfurization process, and the specific control concept is as follows: 1. the AB section comprises two slurry circulating pumps and operates without a synergist; 2. BC represents the operation of two slurry circulating pumps and a synergist with specified concentration (0-200 ppm); 3. CD is three slurry circulating pumps and operates without a synergist; 4. DE is three slurry circulating pumps plus a synergist with specified concentration.
2. Price of synergist is reduced by half (fig. 5)
According to the change of BC line in the figure, the original SO2The concentration of the flue gas is 1000-1750 mg/m3When changing, the synergist concentration needs to be slowly transited from 0ppm to 600ppm (concentration and raw flue gas SO)2The correspondence of the concentrations is determined from fig. 1); the test range of the embodiment is the raw flue gas SO2The concentration is 1000-1750 mg/m3In the middle (the sulfur division interval of the common coal), the data outside the test range is presumed according to the test condition, CE is already out of the test capability range, and the curve analysis thereof is used for presuming reference;
when the price of the synergist is reduced, the cost curve of the synergist is moved downwards, and the balance point is moved to the right along with the cost curve. FIG. 5 is a plot of the ultimate economic operation at half the price of the synergist. It can be directly seen from fig. 5 that the maximum economic operation curve of the synergist in the whole desulfurization process is curve ABCE, and the specific control concept is as follows: 1. the AB section is provided with two slurry circulating pumps and operates without a synergist; 2. BC is the operation of two slurry circulating pumps plus a synergist with specified concentration; 3. CE is three slurry circulating pumps and a specified concentration synergist to operate;
Fourthly, economic evaluation of desulfurization synergist
As shown in FIG. 3, the specific raw flue gas SO2And (3) evaluating the economic efficiency of the desulfurization synergist under the concentration by only comparing the difference value of the longitudinal coordinates of the extreme economic operation curve (ABCDE) and the cost combination (AB, FD and HE) without adding the synergist, namely the economic benefit of the desulfurization synergist. For example, at point B (original SO) in the figure2Flue gas concentration is 1000mg/m3) The theoretical economy of the synergistic agent combination operation mode reaches the maximum, namely BF: w ═ W2-W1T + 141-T141/h, reduced 141 x 24 x 30 10.15 ten thousand yuan/month; at point C (original SO)2Flue gas concentration 1600mg/m3) The theoretical cost of the synergist combined operation mode is equivalent to that of the synergist-free operation mode, and the two control modes have the same economy under the working condition; in CD segment (original SO)2Flue gas concentration 1600mg/m3～1750mg/m3) When the change is carried out, the synergist dosage applied along the CG curve is slowly transited from 400ppm to 600ppm, and the cost is higher than that of a CD curve of three slurry circulating pumps without adding the synergist, so that the desulfurization operation adjustment mode is more economical when the desulfurization operation adjustment mode is switched to the synergist-free operation mode of the three slurry circulating pumps.
Claims (7)
1. The economic evaluation method of the desulfurization synergist is characterized by comprising the following steps of:
step 1, firstly, a synergist adding characteristic test is carried out on a unit desulfurization system to obtain the desulfurization clean flue gas SO under different desulfurization synergist concentrations 2Concentration and raw flue gas SO of desulfurization inlet2A potentiator profile of concentration;
step 2, making a full-combination desulfurization cost curve chart of different desulfurization synergist concentrations and slurry circulating pump combination operation modes;
step 3, obtaining a limit economic operation mode curve of the synergist in the whole process;
step 3.1, desulfurizing the clean flue gas SO under different desulfurizing synergist concentrations obtained in the step 12Concentration and raw flue gas SO of desulfurization inlet2Finding out the SO of the desulfurized clean flue gas from the characteristic curve chart of the synergist of the concentration2Raw flue gas SO of desulfurization inlet under target value of concentration control2The corresponding relation between the concentration and the concentration of the desulfurization synergist;
step 3.2, reacting the corresponding relation in the step 3.1 to the full-combination desulfurization cost curve diagram obtained in the step 2;
step 3.3, leading the original SO flue gas to enter along with the desulfurization in all working condition points in the fully-combined desulfurization cost curve chart2Connecting points with the lowest cost when the concentration changes to obtain a limit economic operation mode curve of the synergist in the whole process;
step 3.4, making a cost curve in the full-combined desulfurization cost curve chart under the combined operation mode of each slurry circulating pump when no desulfurization synergist is fed;
step 4, comparing the curve of the extreme economic operation mode of the synergist with the economic operation mode when the synergist is not added in the full-combined desulfurization cost curve chart Formula curve, the original SO of the flue gas at the inlet of the desulfurization unit is set2The cost difference at the concentration is taken as the economic benefit W of the desulfurization synergist at the moment:
W＝W2-W1
in the formula, W is the economic benefit W of the desulfurization synergist, and the unit is yuan/h; w is a group of2For setting the raw flue gas SO of a desulfurization inlet2The function value of the full-combination desulfurization cost curve when no synergist is added under the concentration; w is a group of1For setting the raw flue gas SO of a desulfurization inlet2The value of the function of the extreme economic operating mode curve of the synergist at the concentration.
2. The economic evaluation method of desulfurization synergists according to claim 1, wherein the step 1 specifically comprises the steps of:
step 1.1, determining a combined operation mode of a slurry circulating pump;
step 1.2, determining the concentration of the desulfurization synergist;
step 1.3, establishing a plane rectangular coordinate system, and desulfurizing the original flue gas SO of the inlet2The concentration is taken as the abscissa, and the desulfurized clean flue gas SO is taken as2Concentration as ordinate;
step 1.4, measuring different desulfurization inlet raw flue gas SO under the working condition2The concentration of the clean flue gas SO is within 5.2-5.6 of the pH value of the desulfurized slurry2The concentrations are connected into a line and used as a synergist adding characteristic curve under the working condition;
step 1.5, under the combined operation mode of the slurry circulating pumps corresponding to the step 1.1, the concentration of the desulfurization synergist is reset to be three to five concentration values, and the correspondingly obtained synergist adding characteristic curves are divided into a group;
Step 1.6, adding a plurality of slurry circulating pump combined operation modes except the slurry circulating pump combined operation mode selected in the step 1.1, and returning to execute the step 1.2 to the step 1.5 after adopting one of the plurality of slurry circulating pump combined operation modes; and (4) all the synergist adding characteristic curves in the plane rectangular coordinate system obtained after all the slurry circulating pumps are adopted to form a desulfurization synergist adding characteristic curve.
3. The economic evaluation method of the desulfurization synergist according to claim 1, wherein the step 2 specifically comprises the steps of:
step 2.1, calculating the cost of continuously supplementing the synergist:
F1＝Fsynergist×(Q1+Q2)
In the above formula, F1The unit is yuan/h for continuously supplementing the cost of the synergist; q1The unit is kg/h for the outward discharge consumption of the synergist; q2The unit is kg/h for chemical degradation amount of the synergist; fSynergistIs the unit price of the synergist, and the unit is yuan/kg;
Q1＝2.125×Qflue gas×COriginal SO2×10-6/η1×CSynergist×10-6
In the above formula, Q1The unit is kg/h for the outward discharge consumption of the synergist; 2.125 is CaSO4And SO2136/64; qFlue gasIs the flow rate of the exhaust smoke of the unit in Nm3/h；COriginal SO2For desulfurizing the imported raw flue gas SO 2Concentration in mg/Nm3；η1Is the solid content of the gypsum slurry; cSynergistThe concentration of the desulfurization synergist is in ppm;
Q2＝Csynergist×α×η2/24
In the above formula, CSynergistThe concentration of the desulfurization synergist is expressed in ppm; alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; eta2The daily degradation consumption rate of the desulfurization synergist;
α＝π×D2/4×H×ρ×10-6
in the above formula, alpha is the holding amount of the synergist in the tower and the concentration conversion coefficient of the synergist, and the unit is kg/ppm; d is the diameter of the desulfurizing tower and is m; h is the slurry liquid level in the desulfurizing tower and the unit is m; rho is the density of the desulfurized slurry in kg/m3，π×D2The volume of slurry in the tower is multiplied by 4H;
step 2.2, calculating the cost of the slurry circulating pump:
F2＝F3+F4；
in the above formula, F2In order to increase the cost of a slurry circulating pump, the unit is Yuan/h; f3The operation cost of a single slurry circulating pump is unit/h; f4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h;
F3＝P×Fprice of electricity
In the above formula, P is the operating electric power of a slurry circulating pump; fPrice of electricityThe unit is yuan/kwh for supplying power price;
F4＝Qflue gas*PResistance device/3600/1000/η3/η4*FPrice of electricity
In the above formula, F4The unit of the cost generated by increasing the electric quantity of the induced draft fan after increasing the input is yuan/h; qFlue gasIs the flow rate of the exhaust smoke of the unit in Nm 3/h；PResistance blockThe smoke resistance increased after the slurry circulating pump is put into use is expressed as Pa; eta3For inducing internal efficiency of the fan, eta4The mechanical efficiency of the induced draft fan is improved; fPrice of electricityThe unit is yuan/kwh for supplying power price;
step 2.3, the raw flue gas SO of the inlet is desulfurized2The concentration is an abscissa, the operation cost under different circulating pumps and synergist concentration combination modes is calculated according to the cost of the slurry circulating pump for increasing the feeding amount of the selected slurry circulating pump combination operation mode and the cost of the continuous supplementary synergist corresponding to the selected desulfurization synergist concentration, and the operation cost is taken as an ordinate and taken as a plane rectangular coordinate system;
step 2.4, according to the selected desulfurization synergist concentration and the operation cost corresponding to the slurry circulating pump combined operation mode, the desulfurization synergist is used as the original flue gas SO of the desulfurization inlet in a rectangular plane coordinate system2The straight line parallel to the horizontal axis in the concentration range.
4. The economic evaluation method of desulfurization synergists according to claim 1, characterized in that: the desulfurization cost generated under the combined operation mode of the desulfurization synergist concentration and the slurry circulating pump in the step 2 is a fixed value.
5. The economic evaluation method of desulfurization synergists according to claim 3, characterized in that: the operation cost W in the step 2.4 is the cost of adding the slurry circulating pump or the cost of adding the slurry circulating pump and the cost of continuously replenishing the synergist.
6. The economic evaluation method of desulfurization synergists according to claim 1, characterized in that: step 3.1, desulfurizing clean flue gas SO2The target concentration control value is 35mg/m3。
7. The desulfurization synergist economical evaluation method according to claim 2, characterized in that: in the step 1.4, the pH value of the desulfurization slurry is 5.3.
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