JP4874087B2 - Method for estimating sodium adsorption amount of ion exchange resin in condensate demineralizer and method for operating condensate demineralizer - Google Patents

Description

  The present invention relates to a method for estimating the amount of sodium adsorbed on an ion exchange resin in a condensate demineralizer and a method for operating the condensate demineralizer.

  In the power generation facility 100 such as a thermal power plant, as shown in FIG. 6, high-temperature and high-pressure steam is generated in the boiler 1, the steam turbine 2 is rotated by the power of the steam, and the generator 3 is operated. Power generation. Then, after the work is finished, the steam that has become low temperature and low pressure is cooled by the cooling pipe 40 passing through the inside of the condenser 4 and returned to water (condensate), and this is returned to the boiler 1 again. Note that seawater flows inside the cooling pipe 40. The steam is cooled and condensed by the cold heat of the seawater and becomes condensate. Further, when returning the condensate from the condenser 4 to the boiler 1, the sodium ion and other impurities contained in the condensate are removed using the condensate demineralizer 5. That is, the condensate demineralizer 5 is filled with an ion exchange resin 50, and the ion exchange resin 50 adsorbs and removes ionic impurities such as sodium ions in the condensate.

By the way, when a crack occurs in the cooling pipe 40 and seawater leaks in the condenser 4, sodium ions flow into the condensate, and when the condensate is returned to the boiler 1, the boiler 1 is adversely affected. It will be. Therefore, the operator detects seawater leakage based on various water quality instruments (for example, the salt detection device 6 and the measurement device 7 in FIG. 6) and regenerates the ion exchange resin 50 of the condensate demineralization device 5 based on this. A corresponding operation such as performing is performed (see, for example, Patent Documents 1 to 3). Such a handling operation is performed based on the sodium adsorption amount of the ion exchange resin 50, and therefore it is necessary to estimate the sodium adsorption amount in advance. Therefore, conventionally, the sodium adsorption amount is estimated by directly sampling the ion exchange resin 50 of the condensate demineralizer 5.
JP-A-6-170361 JP 2001-141596 A JP 2004-45195 A

  However, when the amount of sodium adsorbed is estimated by directly sampling the ion exchange resin as in the prior art, there is a problem that the subsequent handling operation is delayed or conversely too early. The apparatus 5 could not be properly operated. Specifically, if the timing of the response operation is delayed, the water quality of the condensate is deteriorated. Conversely, if the timing is too early, useless response operations are increased and the operation cost is increased.

  The present invention has been made in view of such problems, and the object thereof is to accurately estimate the sodium adsorption amount of the ion exchange resin without directly sampling the ion exchange resin of the condensate demineralizer. The present invention provides a method for estimating the amount of sodium adsorbed on an ion-exchange resin in a condensate demineralizer capable of performing regeneration processing of the condensate demineralizer at an appropriate timing, and an operation method of the condensate demineralizer. is there.

To solve the previous SL problem, the method of estimating the sodium adsorption of ion exchange resin in the condensate demineralizer according to the present invention measures the chloride ion concentration of the condensate water flowing from the outlet portion of the condenser, Based on the measured value , the condensate flow rate, and the chlorine ion concentration in the seawater, the amount of seawater leakage in the condenser is calculated, and the sodium to the condensate demineralizer is calculated based on the calculated value of the seawater leakage. A carry-in amount is calculated, and a sodium adsorption amount per unit amount of the ion exchange resin is estimated based on a calculated value of the sodium carry-in amount and an ion exchange resin amount of the condensate demineralizer. .

  In such a configuration, by measuring the chlorine ion concentration in the condensate flowing through the outlet portion of the condenser, the ion exchange resin of the condensate demineralizer can be directly sampled without sampling. It is possible to accurately estimate the sodium adsorption amount.

Further, the present invention provides a production method of the condensate demineralizer, chloride ion concentration of the condensate water flowing from the outlet portion of the condenser is measured, and the measured value, and the condensate flow, in seawater Calculate the amount of seawater leakage in the condenser based on the chlorine ion concentration , calculate the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, and the amount of sodium brought in The amount of sodium adsorbed per unit amount of the ion exchange resin is estimated based on the calculated value and the amount of ion exchange resin of the condensate demineralizer, and the condensate demineralization is performed at a timing based on the estimated value of the sodium adsorption amount. It is characterized by performing a reproduction process of the apparatus.

  In such a configuration, by measuring the chlorine ion concentration in the condensate flowing through the outlet portion of the condenser, the ion exchange resin of the condensate demineralizer can be directly sampled without sampling. The sodium adsorption amount can be accurately estimated, and as a result, the regeneration process of the condensate demineralizer can be performed at an appropriate timing.

  Further, the present invention is characterized in that the electrical conductivity of the condensate flowing out from the outlet portion of the condenser is measured, and the chlorine ion concentration is measured based on the measured value.

  Further, the present invention is characterized in that the electrical conductivity is measured with a salt analyzer.

Further, the present invention obtains the amount of sodium ions taken into the condensate demineralizer per unit time based on the calculated value of the seawater leakage amount, and estimates the sodium adsorption amount by accumulating this amount. Features.
Furthermore, the present invention is a method for operating a condensate demineralizer,
When the condensate demineralizer is a demineralizer regenerated in H form,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer has increased, regenerate the condensate demineralizer into an H shape,
The sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase, and the chlorine ion concentration measured in the condensate flowing out from the outlet portion of the condenser is the measuring instrument that measures the chlorine ion concentration. If it exceeds the full range, set the constant yield to a value that is smaller than the residual sampling volume, which is the value obtained by subtracting the integrated sampling rate from the constant yield before the seawater leakage of the condensate demineralizer. When the constant yield is reached, the condensate demineralizer is regenerated to H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration does not exceed the full range, the measured chlorine ion concentration, the condensate flow rate, Calculate the amount of seawater leakage in the condenser based on the chlorine ion concentration in seawater, calculate the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, When the sodium adsorption amount per unit amount of the ion exchange resin is estimated based on the calculated amount of carry-in and the ion exchange resin amount of the condensate demineralizer, and the estimated sodium adsorption amount exceeds a predetermined value And regenerating the condensate demineralizer into an H shape,
When the condensate demineralizer is a demineralizer regenerated in NH ₄ form,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer has increased, regenerate the condensate demineralizer into an H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration exceeds the full range, the desalted water is regenerated in the H form. When the amount is smaller than the constant yield set in the case of the device, the condensate demineralizer is regenerated to H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration does not exceed the full range, the measured chlorine ion concentration, the condensate flow rate, Calculate the amount of seawater leakage in the condenser based on the chlorine ion concentration in seawater, calculate the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, When the amount of sodium adsorbed per unit amount of the ion exchange resin is estimated based on the calculated amount of carry-in and the amount of ion exchange resin of the condensate demineralizer, and when the estimated sodium adsorption amount exceeds a predetermined value The condensate demineralizer is regenerated to H form or NH ₄ form.

  According to the present invention, in the estimation method of the sodium adsorption amount of the ion exchange resin in the condensate demineralizer and the operation method of the condensate demineralizer, the ion exchange resin of the condensate demineralizer is directly sampled without sampling. It is possible to estimate the sodium adsorption amount of the exchange resin, and the regeneration treatment of the condensate demineralizer can be performed at an appropriate timing.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a flowchart showing an operation method of the condensate demineralizer 5 in one embodiment of the present invention, FIG. 2 is a graph showing the relationship between the salt detection device instruction maximum value X and the chlorine ion concentration Y in the condensate, FIG. These are graphs showing the relationship between the chlorine ion concentration Y in the condensate and the seawater leakage amount Z. In the present embodiment, a case where the present invention is applied to the configuration of FIG. 6 described above will be described. The salt detection device 6 is a device that measures the chlorine ion concentration in the condensate flowing out from the outlet portion 41 of the condenser 4. The measuring device 7 is a device that measures the electrical conductivity or the sodium ion concentration of condensate flowing through the outlet portion 51 of the condensate demineralizer 5.

  As shown in FIG. 1, the operation method of the condensate demineralizer 5 in this embodiment is based on the measured value of the chlorine ion concentration Y in the condensate flowing out from the outlet portion 41 of the condenser 4. A first step (S101 to 104) for estimating the sodium adsorption amount N of the apparatus 5 and a second step (S201) for performing the regeneration process of the condensate demineralizer 5 based on the sodium adsorption amount N estimated in the first step. ).

First, in the first step, the chlorine ion concentration Y in the condensate flowing out from the outlet portion 41 of the condenser 4 is measured (S101).
Specifically, the electric conductivity σ (μs / cm) in the condensate flowing through the outlet portion 41 of the condenser 4 is measured by the salt detector 6, and the electric conductivity σ that is an indication value of the salt detector 6. Based on the maximum value (hereinafter, referred to as “saloping device instruction maximum value X”), the chlorine ion concentration Y (ppm) in the condensate is measured by the following (formula 1) (see the graph of FIG. 2).
Y = aX + b (Formula 1)
However, a and b are predetermined coefficients, and the values can be obtained experimentally, for example. In this embodiment, a = 0.0669 and b = 0.444.

Next, the measurement value of the chloride ion concentration Y, based on the chloride ion concentration C _CL of condensate flow Q and in sea water, to calculate the seawater leakage amount Z in the condenser 4 (S102).
Specifically, as shown in the following (Formula 2), the measured value of the chlorine ion concentration Y is multiplied by the condensate flow rate Q (for example, Q = 1, 100 t / h in the case of FIG. 3), and the value is obtained. Is divided by the chlorine ion concentration C _CL in seawater (for example, in the case of FIG. 3, C _CL = 20 g / L), and the seawater leakage amount Z (L / h) is calculated (see the graph of FIG. 3). .
Z = Y · Q / C _CL = Y × 1,100 / 20 (Formula 2)

Then, the calculated value of the seawater leakage amount Z and based on the sodium ion concentration C _Na of seawater, to calculate the sodium bring the amount W of the condensate demineralizer 5 (S103).
Specifically, as shown in the following (formula 3), the calculated value of the seawater leakage amount Z (L / h) includes the sodium ion concentration C _Na (for example, C _Na = 25 g / L) in the sea water and the previous measurement. The amount of sodium brought in W (g) from the previous measurement time to the current measurement time is calculated by multiplying the time T (h) from the time to the current measurement time. After that, the calculated values from the previous regeneration time are accumulated to calculate the total amount of sodium brought in W.
W = Z · C _Na · T (Formula 3)

  Next, the sodium adsorption amount N of the ion exchange resin is estimated based on the calculated value (including the cumulative value) of the sodium bringing amount W and the ion exchange resin amount V of the condensate demineralizer 5 (S104). .

Specifically, as shown in the following (formula 4), the calculated value of the sodium carry-in amount W (g) is divided by the ion-exchange resin amount V (for example, 4,600 L), and the sodium adsorption amount N (g / L ).
N = W / V (Formula 4)

Subsequently, in the second step, the regeneration process of the condensate demineralizer 5 is performed based on the sodium adsorption amount N estimated in the first step (S201). For example, when the estimated value of the sodium adsorption amount N does not exceed a predetermined value, the sampling type of the condensate demineralizer 5 is switched from NH ₄ type sampling to H type sampling, while the sodium adsorption amount When the estimated value of N exceeds a predetermined value, the ion exchange resin of the condensate demineralizer 5 is regenerated. Thereby, the regeneration process of the condensate demineralizer 5 can be performed at an appropriate timing.

Next, the operation method of the condensate demineralizer 5 is demonstrated in detail, referring FIG.4 and FIG.5. FIG. 4 is a diagram showing a relationship between a phenomenon occurring in the condensate demineralizer 5 regenerated in the H type and the NH ₄ type and a corresponding operation for responding to the phenomenon. FIG. 5 is a diagram showing the condensate in FIG. It is a figure which shows an example of a desalination apparatus use condition table.

  First, the relationship between the phenomenon that occurs in the condensate demineralizer 5 regenerated in the H shape and the corresponding operation for responding to the phenomenon will be described.

  When the condensate demineralizer 5 is an H type (S401), when the indicated value of the measuring device 7 starts to rise when seawater leakage occurs in the condenser 4 (S402), the sodium adsorption amount N is It is presumed that the limit value has already been exceeded. In this case, there is a concern that sodium chloride may be mixed into the condensate supplied to the boiler 1 and cause a failure of the boiler 1. Therefore, in such a case, the condensate demineralizer 5 is immediately regenerated into an H-type having high sodium adsorption performance regardless of the indicated value of the salt detector 6 and the value of the sodium adsorption amount N (S403). .

  On the other hand, even if the indication value of the measuring device 7 does not start to increase (S404), the indication value of the salt detection device 6 exceeds the frenzy (20 μs / cm in this case) (S405). However, even if the sodium adsorption amount N does not exceed the limit value, the sodium adsorption amount N cannot be accurately determined based on the above-described (Formula 1) to (Formula 4). Therefore, in such a case, for the sake of safety, the remaining water volume of the condensate demineralizer 5 during sampling is calculated. For example, 1/6 of the remaining water volume is set to a constant yield, and the calculation sampling is performed. It is assumed that the condensate demineralizer 5 is regenerated to H type in order from the amount of water that has reached this constant yield (S406). More specifically, if the integrated amount of collected water of the condensate demineralizer 5 during sampling is 132,000 t, the remaining amount of collected water of the condensate demineralizer 5 is 252,000 t (before seawater leakage occurs). (Constant yield) -132,000 t = 120,000 t. Then, 1/6 of the remaining water sampling amount, that is, 120,000 t ÷ 6 = 20,000 t is reset to a constant yield, and the condensate demineralizer 5 is sequentially set from the one in which the calculated water sampling amount reaches this constant yield. Suppose that it reproduces to H type.

  On the other hand, when the indicated value of the measuring device 7 does not start to increase and the indicated value of the salt detection device 6 does not exceed the aforementioned value (20 μs / cm) (S407), FIG. Based on (Equation 4), it is possible to accurately determine the sodium adsorption amount N. Therefore, in such a case, the processing based on FIG. 1 and (Equation 1) to (Equation 4) described above is performed (S408).

For example, the sodium adsorption amount N of the ion exchange resin of the condensate demineralizer 5 is estimated (see S101 to 104), and the estimated value is entered in the condensate demineralizer usage status table (see FIG. 5). When this approximate value exceeds a predetermined value (0.3 g / L as CaCO _{3 in} the figure), the condensate demineralizer 5 is regenerated to H type (see S201). When the condensate demineralizer 5 is regenerated, the number of regenerations may be increased or decreased according to the approximate value of the sodium adsorption amount N (see FIG. 5). In addition, in order to calculate the sodium bring-in amount W (g) for calculating the sodium adsorption amount N, each calculated value from the previous measurement time to the current measurement time is calculated, and then the previous regeneration is performed. Each calculated value from the time is accumulated to calculate the total amount of sodium brought in W.

Also, when the condensate demineralizer 5 is of the NH ₄ type, the same phenomenon as in the case of the H type occurs, and therefore, the corresponding operation is performed in the same manner as in the case of the H type for each phenomenon (S501 to S508). ).

However, when the condensate demineralizer 5 is NH ₄ type (S501), the amount of collected water is increased as compared with the case of H type, but the sodium adsorption performance is low. Therefore, when the condensate demineralizer 5 is of the NH ₄ type, when the indicated value of the measuring device 7 does not start to increase and the indicated value of the salt detector 6 exceeds the predetermined value (20 μs / cm). In (S505), it is presumed that the sodium adsorption amount N is closer to the limit value than in the case of the H type described above. Therefore, in such a case, the condensate demineralizer 5 is regenerated to an H-type in order from the closest one before the calculated amount of water collected by the condensate demineralizer 5 reaches a constant yield (S506).

Further, when the indicated value of the measuring device 7 does not start to increase and the indicated value of the salt detector 6 does not exceed the predetermined value (20 μs / cm) (S507), the condensate demineralizer 5 is changed to the H type or It is assumed that it is regenerated to NH ₄ type (see S508, S101 to 104 and S201).

  As described above, according to the operation method of the condensate demineralizer 5 in the present embodiment, by measuring the chlorine ion concentration Y in the condensate flowing through the outlet portion 41 of the condenser 4, the condensate demineralizer 5 The sodium adsorption amount N can be accurately estimated without directly sampling the ion exchange resin, and the regeneration process of the condensate demineralizer 5 can be performed at an appropriate timing.

It is a flow which shows the operation method of the condensate demineralization apparatus in one Embodiment of this invention. It is a graph which shows the relationship between the salt detection apparatus instruction | indication maximum value and the chlorine ion concentration Y in condensate. It is a graph which shows the relationship between the chlorine ion concentration Y in condensate, and the seawater leakage amount Z. When the seawater leakage occurs in the condenser, and a phenomenon occurring in H-type or NH ₄ form condensate demineralizer of a diagram showing the relationship between the corresponding operation for corresponding to the phenomenon. It is a figure which shows an example of a condensate desalination apparatus use condition table. It is a schematic diagram of power generation equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boiler 2 Steam turbine 3 Generator 4 Condenser 5 Condensate demineralizer 6 Salt detection device 7 Measured value 40 Cooling pipe 41 Condenser outlet part 50 Ion exchange resin 51 Condensate demineralizer outlet part 100 Power generation Facility

Claims (6)

The chloride ion concentration of the condensate water flowing from the outlet portion of the condenser is measured, calculated and the measured value, and the condensate flow, seawater leakage amount in the condenser based on the concentration of chlorine ions in seawater Calculating the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, and based on the calculated value of the sodium carried amount and the amount of ion exchange resin of the condensate demineralizer A method for estimating a sodium adsorption amount of an ion exchange resin in a condensate demineralizer, wherein the sodium adsorption amount per unit amount of the ion exchange resin is estimated. A method for operating a condensate demineralizer,
The chloride ion concentration of the condensate water flowing from the outlet portion of the condenser is measured, calculated and the measured value, and the condensate flow, seawater leakage amount in the condenser based on the concentration of chlorine ions in seawater The amount of sodium brought into the condensate demineralizer is calculated based on the calculated value of the seawater leakage, and the amount of sodium carried into the condensate demineralizer and the ion exchange resin amount of the condensate demineralizer are calculated. The operation of the condensate demineralizer is characterized in that the sodium adsorption amount per unit amount of the ion exchange resin is estimated, and the condensate demineralizer is regenerated at a timing based on the estimated value of the sodium adsorption amount. Method. In claim 2,
A method for operating a condensate demineralizer, comprising measuring an electrical conductivity of condensate flowing out from an outlet portion of the condenser and measuring the chlorine ion concentration based on the measured value. In claim 3,
A method for operating a condensate demineralizer, wherein the electrical conductivity is measured with a salt analyzer. In claims 2-4,
The amount of sodium ions taken into the condensate demineralizer per unit time is determined based on the calculated value of the amount of seawater leakage, and the sodium adsorption amount is estimated by accumulating the amount of sodium ions. Operation method of salt equipment. A method for operating a condensate demineralizer,
When the condensate demineralizer is a demineralizer regenerated in H form,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer has increased, regenerate the condensate demineralizer into an H shape,
The sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase, and the chlorine ion concentration measured in the condensate flowing out from the outlet portion of the condenser is the measuring instrument that measures the chlorine ion concentration. If it exceeds the full range, set the constant yield to a value that is smaller than the residual sampling volume, which is the value obtained by subtracting the integrated sampling rate from the constant yield before the seawater leakage of the condensate demineralizer. When the constant yield is reached, the condensate demineralizer is regenerated to H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration does not exceed the full range, the measured chlorine ion concentration, the condensate flow rate, Calculate the amount of seawater leakage in the condenser based on the chlorine ion concentration in seawater, calculate the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, When the sodium adsorption amount per unit amount of the ion exchange resin is estimated based on the calculated amount of carry-in and the ion exchange resin amount of the condensate demineralizer, and the estimated sodium adsorption amount exceeds a predetermined value And regenerating the condensate demineralizer into an H shape,
When the condensate demineralizer is a demineralizer regenerated in NH ₄ form,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer has increased, regenerate the condensate demineralizer into an H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration exceeds the full range, the desalted water is regenerated in the H form. When the amount is smaller than the constant yield set in the case of the device, the condensate demineralizer is regenerated to H shape,
If the sodium ion concentration measured on the downstream side of the condensate demineralizer does not increase and the measured chlorine ion concentration does not exceed the full range, the measured chlorine ion concentration, the condensate flow rate, Calculate the amount of seawater leakage in the condenser based on the chlorine ion concentration in seawater, calculate the amount of sodium brought into the condensate demineralizer based on the calculated value of the seawater leakage, When the amount of sodium adsorbed per unit amount of the ion exchange resin is estimated based on the calculated amount of carry-in and the amount of ion exchange resin of the condensate demineralizer, and when the estimated sodium adsorption amount exceeds a predetermined value A method for operating a condensate demineralizer, wherein the condensate demineralizer is regenerated into an H shape or an NH _{4 type} .

Images