JP2009139047A - Boiler water quality management device and boiler water quality management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set an optimum chemical injection concentration and an optimum blow rate in accordance with the operating state of a boiler even if there is large fluctuation in the water quality of boiler feed water caused by the use of condensed water. <P>SOLUTION: A boiler water quality management device and boiler water quality management method has a condensed water use rate calculating means 27 for calculating a condensed water use rate being a proportion of the condensed water in the boiler feed water from one of a temperature, electric conductivity or the like of the boiler feed water, soft water, or the condensed water, a water quality management value storing means 26 for storing an equation or the like for calculating one of the optimum chemical injection concentration into the boiler feed water, or the optimum blow rate of boiler water, or the like determined by the condensed water use rate on the basis of the water quality of the soft water and the condensed water, a water quality management amount calculating means 28 for calculating one of the optimum chemical injection concentration, the optimum blow rate or the like on the basis of an output from the condensed water use rate calculating means and the equation or the like in the water quality management value storing means, and an output transmitting means 22 for transmitting information based on an output from the water quality management amount calculating means 28 to one of a chemical injection device, a blow-down device 6, or the like. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a boiler water quality management device and a boiler water quality management method for appropriately managing the quality of boiler water by appropriately injecting chemicals into the boiler feed water and blowing the boiler water. .

  The water quality items of boiler feed water include the concentration of impurities and the dissolved concentration of gas (especially oxygen). These impurities and dissolved gas include substances necessary for safe operation of the boiler (for example, M There are alkali (acid consumption (pH 4.8) component) and harmful substances (for example, oxygen, corrosion products such as iron oxide and copper oxide, chloride ions, sulfate ions, silica) and necessary substances. In the case where the amount of water is insufficient, the missing substance is replenished to the boiler water supply system as a chemical solution, and the harmful substance is injected into the boiler water supply system as a chemical solution to make it harmless. Moreover, it is possible to discharge (blow) boiler water at a predetermined ratio (blow rate) to the boiler feed water flow rate outside the boiler body so that the impurity concentration in the boiler water (can water) falls within an appropriate range. Has been done.

  On the other hand, in recent factories, in order to reduce steam generation costs, condensed water (condensate, drain) after using the thermal energy of steam is collected as much as possible, and boiler feed water is changed from pure water to soft water. And in this boiler, what added soft water to the collected condensed water is used as boiler feed water.

  By the way, the condensed water is distilled water, and the amount of impurities contained is significantly smaller than that of soft water. However, most of the impurities in the condensed water are harmful substances (corrosion products) and hardly contain substances necessary for safe operation of the boiler, such as soft water. In addition, the condensate recovery ratio varies greatly depending on the operation status of the factory. For this reason, the ratio of condensate reused as boiler feed water also varies greatly.

  Therefore, in boilers where soft water is added to condensed water to supply boiler water, the quality of the boiler feed water is likely to fluctuate greatly depending on the proportion of condensed water in the boiler feed water. In a boiler operation with a constant operation and a constant blow rate, harmful substances cannot be sufficiently detoxified, and the impurity concentration of boiler water in the boiler body may exceed an appropriate range. Therefore, in such a boiler, even if the amount of harmful substances in the boiler feed water is the highest (in the worst case), the boiler can be made harmless and the boiler water impurity concentration should not be greatly increased. An operation is performed in which the concentration of the chemical solution injected into the feed water and the blow rate from the boiler body are set high.

  However, if the chemical injection concentration is set to a higher value in anticipation of the worst, or the blow rate is set to a higher value in anticipation of the worst, excessive chemical injection is performed except at the point when the harmful substance is maximum. Excess boiler water is being blown. In other words, excessive setting of the blow rate causes unnecessary waste of heat and water supply, and excessive setting of the chemical injection concentration causes use of unnecessary chemicals and increases the load of wastewater treatment. Eventually, the cost of steam generation will increase.

  In view of the above points, the present invention can easily set the optimum chemical injection concentration and the optimum blow rate according to the operation state of the boiler even if the quality of the boiler feed water varies greatly due to the use of condensed water. An object of the present invention is to provide a boiler water quality management device and a water quality management method.

  Invention of Claim 1 of this invention is equipped with the chemical | medical solution injection | pouring apparatus which inject | pours a water treatment chemical | medical agent into the water supply system of a boiler, and the blow-down apparatus which blows the boiler water in a boiler main body continuously, The collect | recovered steam A water quality management device for a boiler in which soft water is added to the condensed water of the boiler as water supply for the boiler, and the boiler water supply, the soft water, and the condensed water are any of temperature, electrical conductivity, or flow rate used. From the boiler feed water, the condensed water usage rate calculating means for calculating the usage rate of the condensed water, which is the ratio occupied by the condensed water, and the optimum for the boiler feed water, which is determined based on the water quality of the soft water and the condensed water Either a chemical solution injection concentration, an optimum blow rate of boiler water from the boiler body, or an optimum chemical solution injection concentration and an optimum blow rate are determined by using the condensate use rate. Based on the water quality management value storage means for storing the formula, the output from the condensed water usage rate calculation means and the table or formula in the water quality management value storage means, the optimum chemical solution injection concentration, the optimum blow rate, or the optimum Water quality control amount calculation means for calculating one of the chemical solution injection concentration and the optimum blow rate, and information based on the output from the water quality control amount calculation means, the chemical liquid injection device, the blowdown device, or the chemical liquid injection device And an output transmission means for transmitting to any one of the blow-down devices.

  When water obtained by adding soft water to condensed water is used as boiler feed water, if the quality of the condensed water and soft water is clear, the quality of the boiler feed water can be easily determined based on the condensed water usage rate. In this case, the quality of soft water obtained by softening raw water, such as tap water, does not change greatly except for the influence of seasonal water quality fluctuations unless the intake location of the raw water is changed. Further, the quality of the condensed water of the steam generated in the boiler itself does not vary greatly as long as the path of the steam or condensed water is constant, and the impurity concentration contained in the condensed water is small. Therefore, the water quality of soft water and condensed water can be considered to be almost constant for a certain period of time (sometimes throughout the year). Once the quality of soft water and condensed water is clarified, the quality of boiler feed water is It can be easily estimated by the condensed water usage rate. That is, if the water quality of soft water and condensed water is clear, the quality of boiler feed water can be estimated from the usage rate of condensed water, so that the optimum chemical solution injection concentration and the optimum blow rate of boiler water can be easily determined.

  In the present invention, a water quality management value storage means is a table or formula for knowing the optimal chemical injection concentration for boiler feed water and the optimal blow rate of boiler water if the condensate usage rate is known based on soft water and condensed water with clear water quality. I remember it inside. In the present invention, the condensed water usage rate is calculated by the condensed water usage rate calculating means from the temperature of the boiler feed water, the soft water, and the condensed water. Therefore, in the present invention, the water quality management amount calculation means reads out a part of the table in the water quality management value storage means and the formula, and uses the condensed water usage rate calculated by the condensed water usage rate calculation means. By calculating the optimal chemical injection concentration and the optimal blow rate that match the boiler water supply and boiler water at the time of use, the chemical injection device and blowdown device are given the information from the water quality control amount calculation means by the output transmission means. Thus, the chemical solution can be injected or blown so as to follow the operating state of the boiler.

  According to a second aspect of the present invention, in the case of the first aspect, the water quality management value storage means is adapted to respond to a change in the quality of the soft water or a change in the quality of the soft water and the condensed water. The water quality management amount calculating means stores the water quality management based on the quality of soft water currently used or the quality of soft water and condensed water currently used. A necessary table or expression is selected from the value storage means.

  In this invention, the water quality control amount calculation means selects an optimum table or formula from the water quality management value storage means so as to correspond to the water quality such as soft water currently used, and the condensed water usage rate calculation means Using the calculated condensate usage rate, the optimal chemical injection concentration and the optimal blow rate are calculated.

  According to a third aspect of the present invention, there is provided a chemical liquid injection device for injecting water treatment chemicals into a boiler water supply system, and a blow-down device for continuously blowing boiler water in the boiler body. Is a boiler water quality management method in which water added with the condensed water is used as boiler feed water, from the boiler feed water, the soft water, and the condensed water, temperature, electrical conductivity, or use flow rate, Determined by the condensed water usage rate, based on the condensed water usage rate calculating step for calculating the condensed water usage rate, which is the proportion occupied by the condensed water in the boiler feed water, and the water quality of the soft water and the condensed water, Stored in order to calculate either the optimal chemical injection concentration to the boiler feed water, the optimal blow rate of boiler water from the boiler body, or the optimal chemical injection concentration and optimal blow rate A water quality control amount calculating step for calculating either the optimum chemical injection concentration, the optimal blow rate, or the optimal chemical injection concentration and the optimal blow rate based on the output of the table or formula and the condensed water usage rate calculating step; And an output transmission step of transmitting information based on the output from the water quality control amount calculation step to any one of the chemical solution injection device, the blowdown device, or the chemical solution injection device and the blowdown device. Features.

  According to the first and third aspects of the present invention, the quality of the boiler feed water can be easily estimated based on the condensate usage rate, so even if there is a large fluctuation in the quality of the boiler feed water due to the use of the condensate, The optimal chemical injection concentration and optimal blow rate can be set easily according to the operating conditions.

  According to the invention described in claim 2 of the present invention, even if the quality of the boiler feed water changes due to a reason other than the use of the condensed water due to a large change in the water quality such as soft water, it is matched to the operation state of the boiler. , You can easily set the optimal chemical injection concentration and optimal blow rate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a boiler apparatus equipped with a water quality management apparatus according to the present invention.

  As shown in FIG. 1, the boiler device 1 includes a boiler body 2, a water supply tank 3, a soft water tank 4, a cleansing agent injection device 5 </ b> A that is a chemical solution injection device, an oxygen scavenger injection device 5 </ b> B, A down device 6, a measuring device comprising a feed water flow meter 7a, a feed water thermometer 7b, and an electrical conductivity meter 7c, a feed water pipe 8a, a makeup water pipe 8b, a chemical injection pipe 8c, 8d, and a blow down pipe 8e. Pipes, water quality management device 9, input signal wiring 10 from measuring instruments to water quality management device 9, water quality management device 9 to cleansing agent injection device 5A, oxygen scavenger injection device 5B, and blowdown device 6 Output signal wiring 11 and the like.

  The boiler body 2 is a small once-through boiler that generates steam G having a pressure of 0.7 MPa and a rated evaporation amount of several tons / h, for example, and a blow-down pipe is provided in a storage portion of the boiler water B1 below the steam-water separator. 8e and the one end side of the water supply piping 8a are connected. Boiler feed water B2 is supplied from the feed water tank 3 to the boiler body 2 through the feed water pipe 8a, and steam J generated in the boiler body 2 enters the heat exchanger 13 through the steam pipe 12, Heat is dissipated by the heat exchanger 13 to become condensed water G. A part of the condensed water G is collected in the water supply tank 3 through the condensed water recovery pipe 14.

  The feed water tank 3 has a capacity capable of supplying the boiler body 2 with boiler feed water B2 having a rated evaporation amount of 30 minutes or more. Condensed water G is supplied to the water supply tank 3 through the condensed water recovery pipe 14 and soft water N is supplied from the soft water tank 4 so as to compensate for the shortage of the condensed water G. The soft water tank 4 stores soft water N obtained by softening tap water that is raw water.

  The cleansing agent injecting device 5A prevents the alkali agent that adjusts the pH of the boiler water B1 to prevent corrosion or the like in the boiler main body 2 and the stove or the like generated in the boiler main body 2 from adhering as a scale. A canning agent W1 made of a scale dispersant is made into a chemical solution with a constant concentration and injected into the boiler feed water B2. The cleansing agent injection device 5A is provided on the upstream side of the chemical injection pipe 8c, and includes a chemical liquid tank 5a, a chemical liquid pump 5c, and a controller 5e. The oxygen scavenger injection device 5B injects a oxygen scavenger W2 that removes dissolved oxygen that causes corrosion into the boiler feed water B2 as a chemical solution having a constant concentration. The oxygen scavenger injection device 5B is provided on the upstream side of the chemical injection pipe 8d, and includes a chemical liquid tank 5b, a chemical liquid pump 5d, and a controller 5f. The controllers 5e and 5f of the both devices 5A and 5B are provided with the necessary amount of cans based on the canning agent injection signal P1 and the oxygen scavenger injection signal P2 transmitted from the water quality management device 9 via the output signal wiring 10, respectively. It has a function of adjusting the strokes of the chemical pumps 5c and 5d so that the agent W1 and the oxygen scavenger W2 can be supplied.

  The blow-down device 6 continuously discharges boiler water B1 concentrated in the boiler body 2 to the outside of the boiler system by an amount commensurate with the boiler feed water flow rate, and in the boiler water B1 in the boiler body 2 This adjusts the impurity concentration within a specified value. This blow-down device 6 has a flow adjustment valve 6a provided in the blow-down pipe 8c and a blow signal P3 transmitted from the water quality management device 9 via the output signal wiring 11 so that the flow adjustment valve 6a has a necessary amount. It is comprised from the controller 6b which adjusts the opening degree etc. of the flow regulating valve 6a so that boiler water B1 can be discharged | emitted.

  The feed water flow meter 7a measures the flow rate of the boiler feed water B2 supplied to the boiler body 2 and transmits the flow rate signal P4 to the water quality management device 9 via the input signal wiring 10. The feed water thermometer 7b measures the temperature of the boiler feed water B2 in which the condensed water G and the soft water N are mixed, and transmits the temperature signal P5 to the water quality management device 9 through the input signal wiring 10. . The electrical conductivity meter 7c measures the electrical conductivity of the boiler feed water B2.

FIG. 2 shows a water quality management device 9 according to one embodiment of the present invention.
Even if the water quality of the boiler feed water B2 varies greatly due to the use of the condensed water G, the water quality management device 9 is optimal for the cleansing agent injection device 5A and the oxygen scavenger injection device 5B in accordance with the operation state of the boiler device 1. In addition to transmitting a proper chemical injection amount, an optimal blow amount is transmitted to the blow-down device 6. As shown in FIG. 2, the water quality management device 9 includes a computer unit 20 housed in a casing (not shown), a keyboard 40 for an operator to input to the computer unit 20, a start button 41, and The stored content rewriting button 42, a display 43 for the operator to recognize the output from the computer unit 20, and an alarm device 44 that issues an alarm by an alarm signal P6 from the computer unit 20 are provided.

  The computer unit 20 includes a memory for storing various information, a CPU (central processing unit) for calculating information based on the input information and the stored information in the memory, an input means 40 and a measuring device (feed water thermometer 7b). And the input interface 21 for transmitting the input information from the feed water flow meter 7a) to the CPU, and the display 43, the alarm device 44, and the external device (cleaning agent injection device 5A, removal) And an output interface 22 for communicating with the oxygen agent injection device 5B and the blowdown device 6).

  The computer unit 20 includes, as memories, a program ROM 23 that stores program contents, a RAM 24 that provides a working memory for the CPU, a first data memory 25 that stores a part of operation data in a rewritable ROM, and a ROM. Corresponding to the condensed water usage rate X (the ratio of the condensed water G in the boiler feed water B2, see FIG. 4), the injection concentration of the cleansing agent W1 with respect to the boiler feed water B2 and the blow rate of the boiler water B1 (boiler) The formulas Y1 and Y2 (see FIG. 4) for determining the boiler water B1 continuous blow ratio with respect to the feed water flow rate are stored, and the injection concentration of the oxygen scavenger W2 with respect to the boiler feed water B2 is set in correspondence with the feed water temperature Z. And a second data memory 26 for storing a formula Y3 to be determined (see FIG. 4).

  As shown in FIG. 3, in the first data memory 25, soft water temperature T1 and condensate water temperature T2 with little fluctuation in the operation data are stored as 25 ° C. and 100 ° C., respectively. The use water quality Us (for example, as shown in FIG. 8) of the soft water N that is currently used and that has little fluctuation among the operation data is stored.

As shown in FIG. 4, the second data memory 26 stores, for each type of soft water quality U, a formula Y1 of the canning agent injection concentration and a formula Y2 of the blow rate as a function of the condensed water usage rate X. At the same time, a formula Y3 of the oxygen scavenger injection concentration as a function of the feed water temperature Z is stored. The formula Y1 (for example, Y1 = 0.0003X ³ −0.0306X ² + 0.3056X + 45 shown in FIG. 9) of the canning agent injection concentration is the condensation of soft water N having a predetermined water quality and a predetermined water quality (assuming pure water). When water G is used (in the case of the formulas Y1 and Y2 shown in FIG. 9, the soft water quality is that shown in FIG. 8), as shown in FIG. 9, the use of condensed water is used. For example, when the rate X is 0, 30, 60, and 90 (%), the optimum concentration of the fresh canning agent (mg / L) is obtained by a test, and these four points are interpolated with a cubic expression of the condensed water usage rate X. It is determined as follows. Also, the blow rate equation Y2 (for example, Y2 = 0.0011X ² −0.18X + 12.1 shown in FIG. 9) condenses between the four points of the optimum blow rate (%) obtained in the same manner. It is determined by interpolating with a quadratic expression of the water usage rate X. The formulas Y1 and Y2 may be anything as long as they are expressed as a function of the condensed water usage rate X.

  Note that the optimum concentration of the cleansing agent and the optimum blow rate are determined by bringing the water quality of the boiler water B1 as close as possible to the management target value shown in FIG.

Further, the formula for oxygen absorber injection concentration Y3 (for example, Y3 = −0.0001Z ³ + 0.0187Z ² −2.0252Z + 140.86 shown in FIG. 10) indicates that the feed water temperature Z is 25 to 90 ° C. Using the saturated dissolved oxygen concentration at 20 points as a reference, the optimum oxygen scavenger injection concentration (mg / L) at each point such that the dissolved oxygen concentration becomes 0 in the boiler water B1 is determined by testing, and these 20 points The interval is determined by interpolating with a cubic equation of the feed water temperature Z. In addition, as the cleansing agent W1 and the oxygen scavenger W2, those readily available in the market are used. The expression Y3 may be any expression as long as it is expressed as a function of the condensed water usage rate X.

  The computer unit 20 includes a condensed water usage rate calculating unit 27, a first water management amount calculating unit 28, a first water management amount calculating unit 29, and an alarm transmitting unit 30 which form a part of the calculation processing function of the CPU. And an output transmission means 31 and a storage content change means 32.

  The condensed water usage rate calculating means 27 calculates the condensed water G in the boiler feed water B2 from the feed water temperature Z transmitted from the feed water thermometer 7b, the soft water temperature T1 and the condensed water temperature T2 read from the first data memory 25. , Ie, the condensed water usage rate X is calculated. For example, if the feed water temperature Z is 50 ° C., the condensed water usage rate X is 25 ° C. and 100 ° C. when the soft water temperature T 1 and the condensed water temperature T 2 are respectively constant. Since 100X / 100 + 25 (100−X) / 100 = 50, X = 33.3 (%) is calculated.

  The first water management amount calculating means 28 uses the formula Y1 for determining the optimum concentration of the cleansing agent in the second data memory 26 from the use water quality Us of the soft water N read from the first data memory 25, and the optimum water quality Us. The formula Y2 for determining the blow rate is selected, and using these formulas Y1 and Y2 and the condensed water usage rate X which is the output from the condensed water usage rate calculating means 27, the optimum concentration of the cleanser agent and the optimal blow rate are selected. Is calculated. In addition, the first water management amount calculation means 28 calculates the optimum desorption from the feed water temperature Z transmitted from the feed water thermometer 7b and the formula Y3 for determining the oxygen scavenger injection concentration read from the second data memory 27. The oxygen agent injection concentration is calculated.

  The second water management amount calculation means 29 is based on the feed water flow rate transmitted from the feed water flow meter 7a and the cleaning agent injection concentration, oxygen scavenger injection concentration and blow rate calculated by the first water management amount calculation means 28. In addition to calculating the amount of the canning agent (g / h) injected by the canning agent injection device 5A and the amount of the oxygen removal agent (g / h) injected by the oxygen removal agent injection device 5B, the blowdown device 6 blows. The blow flow rate (Kg / h) of the boiler water B1 is calculated.

  When the output value of the second water management amount calculation means 29 is an abnormal value such as an unexpected value or an infeasible value, the alarm transmission means 30 sends an alarm signal to the alarm device 44 including a buzzer or a lamp, for example. P6 is issued to cause the alarm device 44 to generate an alarm sound or blink a lamp. The alarm signal P6 is also transmitted to an alarm device provided in an operator room where an operator is resident through the output signal wiring 11.

  The output transmission means 31 outputs the cleaning agent injection signal P1 related to the amount of the cleaning agent, which is the output value of the first water management amount calculation means 29, to the cleaning agent injection device 5A, and the oxygen scavenger injection signal related to the amount of oxygen removal agent. P2 is transmitted to the oxygen scavenger injection device 5B, and a blow signal P3 relating to the blow amount is transmitted to the blowdown device 6 to operate these devices 5A, 5B, 6 in accordance with the signal values. Further, the output transmission means 31 cancels the transmission of the output from the first water management amount calculation means 29 when the warning transmission means 30 issues a warning signal P6, and sends the warning signal P6 to the device such as the warning device 44. introduce.

  The stored content changing means 32 is used when the operation state of the boiler device 1 is changed or when the water quality management device 9 starts to be used (in the stored content changing means 31, typical soft water temperature T1 or soft water N is used in advance. When the storage content in the first data memory 25 needs to be rewritten when the water quality Us or the like is input), the storage content is rewritten. The stored content changing means 32 operates when the operator presses the stored content rewriting button 42 to request rewriting. For example, the stored content changing means 32 displays the stored content in the first data memory 25 on the display 43 so that the operator can use the keyboard 40. Can be used to rewrite the contents stored in the first data memory 25. The water quality management device 9 returns to the original work when the operator subsequently presses the start button 41.

  Next, the main part of the program operation of the water quality management device 9 will be described with reference to the flowchart shown in FIG. In the first data memory 25 of the water quality management device 9, it is assumed that the used water quality Us, the soft water temperature T1, and the condensed water temperature T2 of the soft water N currently used are written.

  The water quality management device 9 starts operating when the power is turned on and the start button 41 is pressed. First, the data of the soft water temperature T1 and the condensed water temperature T2 and the data of the used water quality Us of the soft water N currently used are read from the first data memory 25 (step S1), and then the feed water thermometer 7b. The condensate usage rate X is calculated from the data relating to the feed water temperature Z transmitted from the data and the data of the soft water temperature T1 and the condensate water temperature T2 read from the first data memory 25 (step S2). Next, using the used water quality Us of the soft water N read from the first data memory 25, from the second data memory 26, the formula Y1 of the cleaning agent injection concentration and the blow rate expression that are most suitable for this used water quality Us. Y2 is read out (step S3), and from the formula Y1 and the blow rate formula Y2 of the canning agent injection concentration, and the condensed water usage rate X already calculated, it is most suitable for the current operating state of the boiler device 1. The (optimal) canning agent injection concentration and blow rate are calculated (step S4).

  Next, the formula Y3 of the oxygen scavenger injection concentration is read from the second data memory 26 (step S5), and using this formula Y3 and data relating to the feed water temperature Z transmitted from the feed water thermometer 7b, the current boiler apparatus 1 is used. The most suitable (optimum) oxygen scavenger injection concentration is calculated (step S6). Next, from the calculated data related to the canned chemical injection concentration (mg / L), the blow rate (%), and the oxygen scavenger injection concentration (mg / L), and the data relating to the feed water flow rate transmitted from the feed water flow meter 7a. The optimum amount of canning agent injection (g / h), the optimum blow amount (Kg / h), and the optimum oxygen scavenger injection amount (g / h) are calculated (step S7). Next, it is checked whether or not the calculated amount of the cleansing agent injected, the amount of blow, and the amount of oxygen scavenger injected are abnormal values (step S8). The amount is transmitted to the cleansing agent injection device 5A, the oxygen scavenger injection amount is transmitted to the oxygen scavenger injection device 5B, and the blow amount is transmitted to the blow down device 6 (step S9). Each of the devices 5A, 5B, 6 is operated for a certain period of time in a state most suitable for the current operation state of the boiler device 1 based on the output value from the water quality management device 9.

  In step S8, if there is an abnormal value in any one of the calculated amount of the cleaning agent injection, the amount of blow, and the amount of oxygen scavenger injection, it becomes YES and an alarm signal P6 is issued (step S10). As a result, the alarm device 44 issues an alarm, and the alarm signal P6 is transmitted via the output signal wiring 11 to the alarm device in the management room where the worker resides. Thus, the water quality management device 9 stops the operation until the cause of the alarm is investigated and the start button 41 is pressed again. As described above, the operations from step S1 to step S9 are repeated at time intervals of, for example, several minutes in consideration of the fluctuation cycle of the condensed water usage rate X and the fluctuation cycle of the feed water flow rate. Of course, the operations from step 1 to step 9 may be repeated continuously without a time interval.

  In addition, when the use water quality Us of the soft water N used is changed or the temperature of the soft water N or the condensed water G is changed, the stored content rewrite button 42 is pressed to operate the water quality management device 9. If the start button 41 is pushed after stopping and rewriting necessary items, the water quality management device 9 operates based on the rewritten data.

  As described above, in this water quality management device 9, if the condensate usage rate X is known in response to changes in the quality of soft water, a plurality of optimum canning agent injection concentrations for boiler feed water B2 and an optimum blow rate for boiler water can be known. Since the condensed water usage rate X is calculated in accordance with the operating state of the boiler device 1, if the used water quality Us of the soft water N used is known, the operating state of the boiler device 1 Therefore, the chemical injection device 5 and the blow-down device 6 can be appropriately operated based on these calculated values.

  That is, in this water quality management device 9, even if there is a large fluctuation in the quality of the boiler feed water B2 due to the use of the condensed water G, it is possible to easily and optimally inject the optimal cleaning agent injection concentration and the optimum according to the operating state of the boiler device 1. Therefore, it is possible to easily prevent the boiler apparatus 1 from injecting excessive chemical liquid or blowing excessive boiler water.

  Moreover, in this water quality management device 9, if the feed water temperature Z is known, an equation for determining the optimum oxygen scavenger injection concentration for the boiler feed water B2 is stored, and data relating to the feed water temperature Z is received from the feed water thermometer 7b. Therefore, the oxygen scavenger injection concentration optimum for the operating state of the boiler device 1 can be easily calculated, and this can easily prevent the boiler device 1 from injecting excessive chemical liquid.

  Here, when there is no significant change in the used water quality Us of the soft water N, in the second data memory 26, the cans as a function of the condensed water usage rate X with respect to the average used water quality Us of the soft water N. It is only necessary to store the formula Y1 of the agent injection concentration and the formula Y2 of the blow rate one by one, and it is not necessary to store data regarding the water quality Us of the soft water N in the first data memory 25.

  When the water quality of the condensed water G cannot be ignored, the data regarding the water quality of the condensed water G is stored in the first data memory 24 and the formula Y1 of the cleaning agent injection concentration in the second data memory 25 is stored. As shown in FIG. 5, for example, as shown in FIG. 5, a plurality of types of condensed water quality V can correspond to one soft water quality U. The rate equation Y2 is selected using the used water quality Us of the soft water N and the used water quality of the condensed water G. In this case, in determining the formula Y1 of the canning agent injection concentration and the formula Y2 of the blow rate, the water quality of the condensed water G is not ignored (not considered as pure water), and the water quality of the condensed water G is also boiler. It is necessary to reflect the water quality of the water supply B2.

  If a soft water thermometer is provided in the soft water tank 4 and a condensed water thermometer is provided in the condensed water recovery pipe 14 so that a temperature signal from these thermometers can be input to the water quality management device 9, the water quality management device. 9 can calculate a more accurate condensed water usage rate X. Of course, in this case, it is not necessary to store the data of the soft water temperature T1 and the condensed water temperature T2 in the first data memory 25.

  In addition, an electrical conductivity meter is provided in the makeup water pipe 8b of the soft water N, and an electrical conduction signal from the electrical conductivity meter and the electrical conductivity meter 7c in the water supply pipe 8a is input to the water quality management device 9, and the soft water N The condensate usage rate X may be calculated from the electrical conductivity value of the boiler and the electrical conductivity value of the boiler feed water B2. In this case, the electric conduction value of the condensed water G is considered as 0. When the electrical conductivity value of the condensed water G cannot be ignored, an electrical conductivity meter is provided also in the condensed water recovery pipe, and an electrical conductivity signal from this is also input to the water quality management device 9. Of course, flow meters are provided in the makeup water pipe 8b and the condensed water recovery pipe for the soft water N, and flow rate signals from these flow meters are input to the water quality management device 9 to supply boiler feed water B2, soft water N, and condensed water G. The condensate usage rate X may be calculated from the flow rate.

  Further, the water supply pipe 8a is provided with a dissolved oxygen concentration meter for measuring the dissolved oxygen concentration of the boiler feed water B2, and a dissolved oxygen concentration signal from the dissolved oxygen concentration meter is input to the water quality management device 9, so that this water quality management device 9 may calculate the oxygen scavenger injection concentration based on the dissolved oxygen concentration transmitted from the dissolved oxygen concentration meter. In this case, the equation Y3 for determining the oxygen scavenger injection concentration in the second data memory 26 needs to use the dissolved oxygen concentration as a function instead of the feed water temperature Z.

  In addition, the information regarding the concentration of the plasticizer and the blow rate stored in the second data memory 25 is not the formulas Y1, Y2 as a function of the condensed water usage rate X, but 0, 1, 2, 3,. Corresponding to the condensed water usage rate X that is subdivided as 100, it is possible to use a table in which the concentration of the canning agent injection and the blow rate are determined. In this case, the first water management amount calculation means 28 selects the canning agent injection concentration and the blow rate corresponding to the condensed water usage rate X in the table closest to the calculated condensed water usage rate X, or The two adjacent canning agent injection concentrations and blow rates in the table are read out, and these are complemented to match the calculated condensate usage rate X to calculate the optimum canning agent injection concentration and blow rate. . Of course, the same applies to the information on the oxygen scavenger injection concentration stored in the second data memory 25.

  Furthermore, in this embodiment, the water quality management device 9 calculates the cleaning agent injection concentration, the oxygen scavenger injection concentration, and the blow rate that are in the operating state of the boiler device 1, and uses the data based on these as the cleaning agent. It is transmitted to the injection device 5A, the oxygen scavenger injection device 5B, and the blow down device 6. For example, any one or any of the cleaning agent injection concentration, the oxygen scavenger injection concentration, and the blow rate is used. Two pieces of information may be calculated, and data based on these pieces of information may be transmitted to a device related to these pieces of information.

  Further, the cleansing agent injection device 5A may be divided into an alkaline agent injection device and a scale dispersant injection device, and the alkaline agent and the scale dispersant may be separately injected into the boiler feed water B2. In this case, in the second data memory 26, for each soft water quality U, the concentration of the alkaline agent injection as a function of the condensed water usage rate X, and the condensed water usage rate X as a function for each soft water quality U. And the first water management amount calculation means 28 calculates the above two calculations according to the used water quality Us of the soft water N from the second data memory 26. After selecting the equation, it is necessary to calculate the optimum alkali agent injection concentration and the optimum scale dispersant injection concentration using the condensed water usage rate X.

  Although the above description is about the water quality management apparatus 9 of the boiler apparatus 1, it is also about the water quality management method of the boiler apparatus 1 which has a condensed water usage rate calculation step, a water quality management amount calculation step, and an output transmission step. The same can be said. In this case, the boiler device 1 includes a cleansing agent injection device 5A for injecting the cleansing agent W1 into the boiler feed water B2, and a blowdown device 6 for continuously blowing the boiler water B2 in the boiler body 2. In this boiler apparatus 1, water obtained by adding soft water N to steam condensed water G is used as boiler feed water B2.

  Here, in the condensed water usage rate calculating step, the ratio of the condensed water G in the boiler feed water B2 from the temperature, electrical conductivity, or usage flow rate of the boiler feed water B1, the soft water N, and the condensed water G is the ratio. Condensate usage rate X is calculated. Further, in the next water quality control amount calculation step, the optimum concentration of the cleansing agent injected into the boiler feed water B2, which is determined by the condensed water usage rate X, based on the water quality of the soft water N and the condensed water G, Based on the table or equations Y1 and Y2 stored for calculating either the optimum blow rate of the boiler water B1, or the optimum tinting agent injection concentration and the optimum blow rate, and the output of the condensate use rate calculation step Then, either the optimum canning agent injection concentration, the optimum blow rate, or the optimum canning agent injection concentration and the optimum blow rate are calculated. Furthermore, in the next output transmission step, the information based on the output from the water quality control amount calculation step is any one of the canning agent injection device 5A, the blowdown device 6, or the canning agent injection device 5A and the blowdown device 6. To communicate.

  By the way, in the present embodiment, for example, in obtaining the formula Y1 of the cleaning agent injection concentration as shown in FIG. 9, the optimum cleaning can when the condensed water usage rate X is 0, 30, 60, 90 (%). The agent injection concentration (mg / L) is obtained by a test. In this case, the test apparatus is a miniaturized version of the boiler apparatus 1 shown in FIG. 1, for example, steam of a boiler body 2 ′. The generated amount is 7.2 L / h (pressure 0.7 MPa) in terms of water supply amount. In this test apparatus, under the operating conditions of the boiler apparatus 1 'when the condensate usage rate X is 0, 30, 60, 90 (%), the optimum canning agent supply concentration and the optimum blow rate are obtained by actual measurement. Further, in this test apparatus, optimum deoxygenation is performed under the operating conditions of the boiler apparatus 1 ′ at 20 points of the feed water temperature Z from 25 to 90 ° C. for the boiler feed water B2 in which dissolved oxygen is saturated at the feed water temperature Z. The agent injection concentration is obtained by actual measurement.

  Here, when the water quality Us of the soft water N and the water quality of the condensed water G are known, the computer unit 20 ′ of the water quality management device 9 ′ of this test apparatus has a condensed water usage rate X and a cleansing agent. If the injection concentration and the blow rate are known, boiler water quality calculation means for calculating the water quality of the boiler water B1 is provided. FIG. 11 shows the case where the boiler water quality calculation means uses the concentration of the canning agent injection and the blow rate shown in FIG. 9 in relation to the condensed water usage rate X (in this case, the water quality of the soft water N is 8 is used, and the water quality of the boiler water B1 is calculated by calculation. The water quality of the condensed water G is assumed to be pure water). This calculation result is stored in the upper limit value and the lower limit value of the water quality of the boiler water shown in FIG.

  The “dispersant concentration ratio” in FIGS. 7 and 11 is the ratio of the dispersant concentration in the boiler water B1 to the predetermined reference concentration of the dispersant, and the “P ratio” is the P alkali concentration / silica concentration. Value.

It is a figure which shows an example of a boiler apparatus. It is a block diagram which shows the outline | summary of the water quality management apparatus which concerns on one embodiment of this invention. It is a figure which shows the memory content of a 1st data memory. It is a figure which shows the memory content of a 2nd data memory. It is a figure which shows a part of other memory content of a 2nd data memory. It is a flowchart which shows the principal part of the program operation | movement of a water quality management apparatus. It is a figure which shows the water quality management reference value example of boiler water. It is a figure which shows the water quality example etc. of soft water. When the soft water of the water quality shown in FIG. 8 and the condensed water of the pure water quality are used, these graphs in the case where the optimum canning agent injection concentration and the optimum blow rate are shown as a function of the condensed water usage rate and It is a figure which shows a type | formula. It is a figure which shows the graph and type | formula at the time of showing the optimal oxygen absorber injection | pouring density | concentration as a function of feed water temperature, when using boiler feed water with which dissolved oxygen concentration is saturated with feed water temperature. It is a figure which shows the result of having calculated the water quality of boiler water by calculation, when the cleaning agent injection density | concentration and blow rate which are shown by FIG. 9 are used in relation to the condensed water usage rate X. FIG.

Explanation of symbols

1 Boiler equipment (Boiler)
2 Boiler body 5A Cleaner injection device (chemical solution injection device)
6 Blowdown device 9 Water quality management device 26 Second data memory (water quality management value storage means)
27 Condensate usage rate calculating means 28 First water management amount calculating means (water quality management amount calculating means)
31 Output transmission means B1 Boiler water B2 Boiler feed water G Condensed water N Soft water T1 Soft water temperature T2 Condensed water temperature W1 Cleaner agent (water treatment chemical)
Formula to determine Y1 cleansing agent injection concentration (Formula to determine chemical solution injection concentration)
Formula to determine Y2 blow rate X Condensate usage rate Z Feed water temperature

Claims (3)

It is equipped with a chemical injection device that injects water treatment chemicals into the boiler water supply system, and a blow-down device that continuously blows boiler water in the boiler body, and water that is obtained by adding soft water to the condensed water of the recovered steam A boiler water quality management device used as water supply,
Condensate usage rate for calculating the condensed water usage rate, which is the proportion of the boiler feed water occupied by the condensed water, from any of temperature, electrical conductivity, or usage flow rate of the boiler feed water, the soft water, and the condensed water. Computing means;
Any one of the optimal chemical injection concentration to the boiler feed water, the optimal blow rate of boiler water from the boiler body, or the optimal chemical injection concentration and optimal blow rate determined based on the water quality of the soft water and the condensed water A water quality management value storage means for storing a table or formula determined using the condensed water usage rate,
Based on the output from the condensed water usage rate calculating means and the table or formula in the water quality management value storage means, either the optimal chemical solution injection concentration, the optimal blow rate, or the optimal chemical solution injection concentration and the optimal blow rate Water quality control amount calculating means for calculating
Output transmission means for transmitting information based on the output from the water quality control amount calculation means to any one of the chemical liquid injection device, the blowdown device, or the chemical liquid injection device and the blowdown device, Boiler water quality management device. The water quality management value storage means stores the table or formula in correspondence with a change in the quality of the soft water or a change in the quality of the soft water and the condensed water,
The water quality management amount calculation means selects a necessary table or formula from the water quality management value storage means based on the quality of soft water currently used or the quality of soft water and condensed water currently used. 2. The boiler water quality management device according to claim 1, wherein: It is equipped with a chemical injection device that injects water treatment chemicals into the boiler water supply system, and a blow-down device that continuously blows boiler water in the boiler body, and water that is obtained by adding soft water to the condensed water of the recovered steam A water quality management method for boilers used as water supply,
Condensate usage rate for calculating the condensed water usage rate, which is the proportion of the boiler feed water occupied by the condensed water, from any of temperature, electrical conductivity, or usage flow rate of the boiler feed water, the soft water, and the condensed water. A calculation step;
Any one of the optimal chemical injection concentration to the boiler feed water, the optimal blow rate of boiler water from the boiler body, or the optimal chemical injection concentration and optimal blow rate, which is determined based on the water quality of the soft water and the condensed water In accordance with the table or formula determined using the condensed water usage rate and the output from the condensed water usage rate calculating step, the optimal chemical injection concentration, the optimal blow rate, or the optimal chemical injection concentration and the optimal blow rate A water quality control amount calculating step for calculating any one of
An output transmission step of transmitting information based on the output from the water quality control amount calculation step to any one of the chemical solution injection device, the blowdown device, or the chemical solution injection device and the blowdown device. Boiler water quality management method.

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