Control system, information processing device, program, and method for controlling the cleanup process of water circulation piping.

Abstract

To provide a control system which enables reduction of a water circulation pipe clean-up process in a gas-gas heater device 200.SOLUTION: At a control system of a water circulation pipe 4 clean up process in a gas-gas heater device 200, including a heat recovery device 2 configured to recover heat from exhaust gas of a boiler 71, a heater 3 which increases a temperature of a process gas, and the water circulation pipe 4 located between the heat recovery device 2 and the heater 3, in a flushing process of the water circulation pipe 4, drainage tank draining control means 102 of an information processing device 1 controls drainage tank draining means 46 so that a water level of a drainage tank 52 received by drainage tank water level receiving means 104 is maintained at a level lower than a setting value. Further, water circulation control means 105 of the information processing device 1 controls a water supply valve 47 and circulation water draining means 45 so that a water storage amount of a circulation water tank 51 received by circulation water tank water storage amount receiving means 103 is maintained in a predetermined amount or larger amount and the water level of the drainage tank 52 received by the drainage tank water level receiving means 104 becomes lower than a predetermined value.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a control system for a water circulation pipe cleaning process, an information processing device, a program, and a method for controlling a water circulation pipe cleaning process.

Background Art

[0002] Conventionally, a device (gas-gas heater device: GGH) that recovers heat from boiler exhaust gas using a heat recovery device and raises the temperature of desulfurized treatment gas to a predetermined temperature using a reheater has been used, for example, in a boiler device. The heat recovery device is installed upstream of the dry dust collector, and the temperature of the treatment gas is around 90°C. As a result, the electrical resistivity of dust is reduced, and the dust removal efficiency is improved. And the cleaning of the circulating water pipe system is regularly carried out.

[0003] For example, Patent Document 1 discloses a technique that includes a drainage process of circulating water to the outside of the boiler system and a boiler cleaning process by a water circulation process performed after the drainage process, and boiler ignition is executed after the completion of the boiler cleaning process.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A long number of days (for example, 11 days) is required for the trial operation after the completion of the cleaning process. For example, it is for the purpose of aiming at a specified drainage volume (1500 m 3 : 300 m 3 × 5 times) and implementing the processes of water supply, flushing, and drainage step by step. Furthermore, when drainage is carried out at night, it takes time for the water supply and air venting system switching work. Therefore, it is difficult to synchronize with the process on the side using the boiler.

[0006] The present invention aims to provide a control system, information processing device, program, and method for controlling the cleaning process of water circulation piping in a gas heater system, which shorten the cleaning process of the water circulation piping. [Means for solving the problem]

[0007] To achieve the above objective, a control system for a cleanup process in a gas heater device, which comprises a heat recovery unit for recovering heat from boiler exhaust gas, a heater for raising the temperature of the processed gas to a predetermined temperature, a water circulation pipe for circulating water between the heat recovery unit and the heater, and a circulating water tank connected to a branch pipe from the water circulation pipe for storing water, the control system for a cleanup process of a water circulation pipe, comprising: a water supply pipe for supplying water to the water circulation pipe; a water supply valve provided in the water supply pipe; a circulating water drain pipe provided as a branch to the water circulation pipe; a circulating water draining means for draining water from the water circulation pipe to a drain pipe; a drain tank for storing wastewater discharged from the water circulation pipe through the circulating water drain pipe; a drain tank draining means for sending water from the drain tank to a wastewater treatment device; a drain tank water level detector for detecting the amount of water in the drain tank; and a circulating water tank storage capacity. The system includes a circulating water tank water level detector and an information processing device, the information processing device having a water supply valve control means for controlling the opening and closing of a water supply valve, a drainage tank drainage control means for controlling a drainage tank drainage means, a circulating water tank water level receiving means for receiving the amount of water stored in the tank from the circulating water tank water level detector, a drainage tank water level receiving means for receiving the water level of the drainage tank from a drainage tank water level detector, and a water circulation control means for controlling the circulating water. In the flushing process of the water circulation piping, the drainage tank drainage control means controls the drainage tank drainage means so that the water level of the drainage tank received by the drainage tank water level receiving means is kept below a set value, and the water circulation control means controls the circulating water so that the amount of water stored in the circulating water tank received by the circulating water tank water level receiving means is kept above a predetermined amount, and the water level of the drainage tank received by the drainage tank water level receiving means is below a predetermined value. [Effects of the Invention]

[0008] According to the present invention, a control system, an information processing device, a program, and a control method for the water circulation piping cleanup process are provided, which shorten the cleanup process for the water circulation piping in a gas heater device. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing a boiler, exhaust system, and gas heater system according to the present invention. [Figure 2] This is a schematic diagram showing the water supply process in the control system for a gas heater device according to the present invention. [Figure 3] This is a block diagram showing the hardware configuration of an information processing device according to the present invention. [Figure 4] This is a block diagram showing the functional configuration of the information processing apparatus according to the present invention. [Figure 5] This is a schematic diagram showing the flushing process in the control system of a gas heater device according to the present invention. [Figure 6] This is a schematic diagram showing the drainage process in the control system of a gas heater device according to the present invention. [Figure 7] This is a schematic diagram illustrating a process in which flushing and drainage are performed simultaneously in the control system of a gas heater device according to the present invention. [Figure 8] This is a sequence diagram of a process in which flushing and drainage are performed simultaneously at all times in the control system of a gas heater device according to the present invention. [Figure 9] This is a sequence diagram of a process in which flushing and drainage are performed simultaneously as appropriate in the control system of a gas heater device according to the present invention. [Figure 10] This is a sequence diagram of a conventional comparative example of the flushing and drainage process of a gas heater device according to the present invention. [Modes for carrying out the invention]

[0010] Hereinafter, a control system 100 for the cleanup process of a gas heater device according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the same components are denoted by the same reference numeral. When the same components are distinguished as a first component, a second component, etc., the reference numeral a, b, etc., is added.

[0011] Figure 1 is a schematic diagram showing a boiler 71, exhaust system 74, and gas heater system 200 in a coal-fired power plant where the boiler 71 is used. The gas heater system 200 is, for example, a non-leak type gas heater system (MGGH). Figure 2 shows the gas heater system 200. A heat recovery unit 2, water circulation piping 4, and heater 3 constitute the gas heater system 200. As shown in Figure 1, the exhaust gas from the boiler 71 has its heat absorbed and recovered by the heat recovery unit 2, and the untreated gas temperature is reduced to around 90 degrees. This reduces the electrical resistivity of the untreated gas, improving the dust removal efficiency of the electrostatic precipitator 72. The dust-removed gas is then sent to the desulfurization unit 73, where desulfurization is performed. That is, sulfur compounds are removed. The treated gas that has passed through the desulfurization unit 73 is then reheated by the heater 3, which improves gas diffusion from the exhaust system 74. Here, the heat absorbed and recovered in the heat recovery unit 2 is used for heating in the heater 3. The water heated in the heat recovery unit 2 is sent to the heater 3 through the water circulation pipe 4, and the heated water in the heater 3 raises the temperature of the processed gas.

[0012] Figure 2 is a schematic diagram showing only the gas heater device 200 according to the present invention, extracted from Figure 1, and is a schematic diagram showing the control system 100 for the gas heater device cleanup process. In particular, Figure 2 shows the water supply process.

[0013] The untreated gas is introduced into the heat recovery unit 2. The treated gas that has been dust-removed and desulfurized is introduced into the heater 3. A water circulation pipe 4 is provided between the heat recovery unit 2 and the heater 3. A water circulation pipe 4a is provided in the heat recovery unit 2. The water in the water circulation pipe 4a is heated in the heat recovery unit 2 to absorb and recover heat. The water that has absorbed and recovered heat in the heat recovery unit 2 is sent to the heater 3 through the water circulation pipe 4b. The water sent to the heater 3 gives heat to the gas through the water circulation pipe 4c provided in the heater 3. The water discharged from the heater 3 is sent to the heat recovery unit 2 through the water circulation pipe 4d. The water in the water circulation pipe 4a circulates through the water circulation pipe 4 by the circulating water circulation means 44. The circulating water circulation means 44 is, for example, an electric pump.

[0014] A first branch pipe 41 is provided in the water circulation pipe 4, and the water circulation pipe 4 is connected to the circulating water tank 51 by the first branch pipe 41. The circulating water tank 51 stores the water circulating through the water circulation pipe 4. A water supply pipe 42 is provided in the water circulation pipe 4, and the water supply pipe 42 is connected to a water supply pump (not shown). The water supply pipe 42 has a water supply valve 47. When the water supply pump (not shown) operates and the water supply valve 47 is opened, water is supplied to the water circulation pipe 4. When the water supply valve 47 is closed, the supply of water to the water circulation pipe 4 is stopped. The water supply amount is adjusted by the opening degree of the water supply valve 47. A circulating water drain pipe 43 is provided in the water circulation pipe 4. The circulating water drain pipe 43 is connected to the drain tank 52. The circulating water drain pipe 43 has a circulating water drainage means 45. The circulating water drainage means 45 is a drain valve or / and a drain pump. When the circulating water drainage means 45 is open or operating, water is drained from the water circulation pipe 4 toward the drain tank 52. The gas-gas heater device 200 has a drain tank drainage means 46. The drain tank 52 is connected to the drain tank drainage means 46. The drain tank drainage means 46 is connected to a drainage treatment device (not shown). The drain tank drainage means 46 is, for example, a pump. When the drain tank drainage means 46 is operating, the water in the drain tank 52 is drained.

[0015] The drain tank 52 has a drain tank water level detector not shown. The drain tank water level detector detects the water level of the drain tank 52 and transmits the detection result to the information processing device 1. The circulating water tank 51 has a circulating water tank water storage amount detector not shown. The circulating water tank water storage amount detector is, for example, a pressure type water level gauge that measures water pressure and detects the water storage amount. The circulating water tank water storage amount detector transmits the detection result of the detected water storage amount of the circulating water tank 51 to the information processing device 1. The water supply valve 47 has a controller not shown, and the opening degree of the water supply valve 47 can be controlled. The circulating water circulation means 44, the circulating water drainage means 45, and the drain tank drainage means 46 each have a controller and can be controlled by an electrical signal from the information processing device 1 via the communication means 17 of the information processing device 1, the operation of which will be described later.

[0016] The control system 100 for the gas gas heater device cleaning process has an information processing device 1. The information processing device 1 controls the circulating water circulation means 44, the water supply valve 47, the circulating water drainage means 45, the drain tank drainage means 46, etc. in the cleaning process of the gas gas heater device 200.

[0017] Figure 3 shows the hardware configuration of the information processing device 1. As shown in Figure 3, the information processing device 1 includes a control unit 10, an input / output unit 16, a communication means 17, and a storage unit 18. The control unit 10 has a processor 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a bus 14, and an input / output interface 15. The information processing device 1 may be a general-purpose personal computer capable of executing various functions by installing various programs, or may be a computer incorporated in dedicated hardware.

[0018] The processor 11 performs various calculations and processes. The processor 11 is, for example, a CPU (central processing unit), MPU (micro processing unit), SoC (system on a chip), DSP (digital signal processor), GPU (graphics processing unit), ASIC (application specific integrated circuit), PLD (programmable logic device), or FPGA (field-programmable gate array). Alternatively, the processor 11 is a combination of several of these. Furthermore, the processor 11 may be a combination of these with hardware accelerators, etc.

[0019] The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. The processor 11 performs various processes according to the program recorded in ROM 12 or the program loaded into RAM 13. Part or all of the program may be incorporated into the circuitry of the processor 11.

[0020] Bus 14 is also connected to input / output interface 15. An input / output unit 16, a communication means 17, and a storage unit 18 are connected to the input / output interface 15.

[0021] The input / output unit 16 is electrically connected to the input / output interface 15 by wire or wireless connection. The input / output unit 16 consists of, for example, an input unit such as a keyboard and mouse, and an output unit such as a display for displaying images and a speaker for amplifying sound. The input / output unit 16 may also have an integrated configuration of display and input functions, such as a touch panel.

[0022] The communication means 17 is a device for the processor 11 to communicate with the circulating water circulation means 44, water supply valve 47, circulating water drainage means 45, drainage tank drainage means 46, etc., according to the embodiment of the present invention, via, for example, a wired connection (not shown) or a network such as the Internet (not shown). The storage unit 18 is a storage device such as a hard disk drive (HDD) or solid-state drive (SSD) that stores a program to control the entire gas heater device 200, the water level measurement results of the drainage tank 52, the water storage amount measurement results of the circulating water tank 51, the opening degree of the water supply valve 47, the operating status of the circulating water circulation means 44, past control history, etc.

[0023] The hardware configuration shown in Figure 3 is merely an example and is not limited to this configuration. In addition to being composed of various processing units such as single processors, multiprocessors, and multicore processors, a combination of these various processing units and processing circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays) may be adopted to realize a functional configuration as a processor. The information processing device 1 does not have a storage unit 18, but rather a configuration in which a storage unit 18 is provided separately may be adopted.

[0024] Figure 4 is a block diagram showing the functional configuration of the information processing device 1 according to this embodiment. Each function shown in Figure 4 is realized by the processor 11 and other components of the information processing device 1 shown in Figure 3.

[0025] The water supply valve control means 101 sends a signal via the communication means 17 to a controller (not shown) provided in the water supply valve 47 to control the opening and closing and the degree of opening of the water supply valve 47. The drainage tank drainage control means 102 sends a signal via the communication means 17 to a controller (not shown) provided in the drainage tank drainage means 46 to control the operation of the drainage tank drainage means 46. As a result, the drainage tank drainage control means 102 controls the amount of water drained per unit time from the drainage tank 52. The circulating water tank water level receiving means 103 receives the amount of water stored in the circulating water tank 51 from a circulating water tank water level detector (not shown) provided in the circulating water tank 51 via the communication means 17. The drainage tank water level receiving means 104 receives the water level of the drainage tank 52 from a drainage tank water level detector (not shown) via the communication means 17. The water circulation control means 105 controls the flow of circulating water circulating in the water circulation piping 4 and the circulating water tank 51, etc. via the communication means 17. As will be explained in more detail later, the water circulation control means 105 controls the circulating water volume, water supply volume, drainage volume, etc.

[0026] Referring to Figures 1 to 7, the control of the cleanup process of the water circulation piping 4 by the information processing device 1 according to the present invention will be explained. The cleanup process has as basic steps the water supply process shown in Figure 2, the flushing process shown in Figure 5, and the drainage process shown in Figure 6. In addition to these, the cleanup process according to the present invention has a continuous drainage process that performs the water supply, flushing, and drainage processes simultaneously, as shown in Figure 7.

[0027] Figure 2 is a schematic diagram showing the water supply process to the water circulation piping 4. The water circulation control means 105 closes the circulating water draining means 45 and opens the water supply valve 47. This supplies water to the water circulation piping 4. The circulating water tank water level receiving means 103 receives the amount of water stored in the circulating water tank 51 from a circulating water tank water level detector (not shown) attached to the circulating water tank 51. The water circulation control means 105 opens and closes the water supply valve 47, or adjusts its opening degree, based on the amount of water stored in the circulating water tank 51 received by the circulating water tank water level receiving means 103. When the amount of water stored in the circulating water tank 51 reaches a predetermined amount, the water circulation control means 105 closes the water supply valve 47 and stops the water supply.

[0028] Figure 5 is a schematic diagram showing a flushing process in the control system 100 of a gas heater device 200, in which water is circulated through the water circulation pipe 4 to clean the water circulation pipe 4. In this specification, the series of steps for cleaning the water circulation pipe 4 are collectively referred to as the cleanup process. As part of the cleanup process, the step of circulating water through the water circulation pipe 4 to remove dirt inside the water circulation pipe 4 with circulating water is called the flushing process.

[0029] The water circulation control means 105 closes the water supply valve 47 and stops the circulating water draining means 45. If the circulating water draining means 45 is a drain valve, it closes the drain valve; if the circulating water draining means 45 is a pump, it stops the pump and stops the flow of water. The water circulation control means 105 circulates water in the water circulation pipe 4 using the circulating water circulation means 44. If the circulating water circulation means 44 is a pump, it operates the pump. The water circulating in the water circulation pipe 4 removes dirt adhering to the water circulation pipe 4, such as limescale or rust.

[0030] Figure 6 is a schematic diagram showing the drainage process in the control system 100 for the gas heater device cleanup process. The water circulation control means 105 closes the water supply valve 47, operates the circulating water drainage means 45, and stops the circulating water circulation means 44. Through the circulating water drainage means 45, the water in the water circulation piping 4 is drained into the drainage tank 52. Although the circulating water circulation means 44 is stopped, the circulating water flows through the circulating water circulation means 44 and through the water circulation piping 4. In the case of a machine configuration where the water flow stops when the circulating water circulation means 44 is stopped, the water may be configured to flow through a detour piping not shown. The drainage tank water level receiving means 104 receives the water level of the drainage tank 52 from a drainage tank water level detector not shown. The drainage tank drainage control means 102 controls the circulating water drainage means 45 and the drainage tank drainage means 46 so that the water level of the drainage tank 52 is maintained below a predetermined level.

[0031] Figure 7 is a schematic diagram showing the process in which flushing and drainage are performed simultaneously in the control system 100 for the cleanup process of the gas heater device 200. This process is called continuous drainage. The drainage tank drainage control means 102 controls the drainage tank drainage means 46 so that the water level in the drainage tank 52, as received by the drainage tank water level receiving means 104, is kept below a set value. At the same time, the water circulation control means 105 controls the amount of circulating water so that the amount of water stored in the circulating water tank 51, as received by the circulating water tank water storage amount receiving means 103, is kept above a first predetermined amount and below a second predetermined value. The water circulation control means 105 controls the circulating water circulation means 44 to control the flow rate of circulating water per unit time. The water circulation control means 105 controls the water supply valve 47 to control the amount of tap water supplied. The greater the amount of circulating water per unit time and the greater the amount of clean water supplied per unit time, the greater the flushing effect.

[0032] The water circulation control means 105 controls at least one of the water supply valve 47 and the circulating water drainage means 45 to control the amount of circulating water. With the circulating water circulation means 44 in operation, the water circulation control means 105 may control the water supply valve 47 and the circulating water drainage means 45 so that the amount of water supplied per unit time and the amount of circulating water drained per unit time are the same.

[0033] The drainage tank drainage control means 102 transmits the situation to the water circulation control means 105 when the water level in the drainage tank 52, as received by the drainage tank water level receiving means 104, exceeds or is expected to exceed a predetermined water level while the drainage tank drainage means 46 is operating. To enhance the flushing effect, it is effective to increase the amount of water supplied and drained per unit time. However, for example, if the amount of drained water is too large, the control of the drainage tank drainage means 46 by the drainage tank drainage control means 102 alone cannot keep the water level in the drainage tank 52 below the predetermined water level. In addition, for example, the drainage tank drainage means 46 is an electric pump, and it is conceivable that an unstable state may occur where the operation of the electric pump becomes unstable due to an earthquake or power outage. Based on the information transmitted from the drainage tank drainage control means 102, the water circulation control means 105 narrows the water supply valve 47 to reduce the amount of water supplied, and / or suppresses the drainage of circulating water by the circulating water drainage means 45.

[0034] The control of the gas heater device cleanup process will be explained with reference to Figures 8 to 10. Figure 8 is a sequence diagram of a process in which flushing and drainage are always performed simultaneously in the control system 100 of the gas heater device 200 according to the present invention. Figure 9 is a sequence diagram of a process in which flushing and drainage are performed simultaneously as appropriate in the control system 100 of the gas heater device 200 according to the present invention. Figure 10 is a sequence diagram of a conventional process example of flushing and drainage of the gas heater device 200.

[0035] According to the conventional comparative example shown in Figure 10, water supply, air bleeding, flushing, and drainage are performed sequentially, and these processes do not overlap. Air bleeding is performed in conjunction with the supply of water to the water circulation pipe 4. Air bleeding is the process of removing air from the water circulation pipe 4 through an air bleeding valve (not shown in Figures 2 and 5-7) installed in the water circulation pipe 4. The temperature of the drained water is close to 100 degrees Celsius, and there is a risk of burns from splashing water during the air bleeding process. For this reason, the air bleeding work on the water circulation pipe 4 is completed during cold operation when the temperature of the circulating water is low. Generally, the drainage volume is 1500 m³. 3 :300m 3 The goal is to perform the water supply, flushing, and drainage processes five times, with each step being carried out. If drainage is performed at night, the switching work such as water supply and air bleeding takes time, making it difficult to synchronize with the operating process of boiler 71 shown in Figure 1.

[0036] Figure 8 is a sequence diagram of an example of continuous drainage in the control system 100 for the cleanup process of the water circulation piping 4 according to the present invention, in which flushing and drainage are performed in succession. For example, when flushing the water circulation piping 4, water supply and drainage are performed simultaneously. During continuous drainage, if the amount of drainage exceeds the amount of water supplied, the system will stop due to a decrease in the water level in the circulating water tank 51. Conversely, if the amount of water stored in the circulating water tank 51 is too large, the pressure in the circulating water tank 51 will become too high, which is unsuitable. Also, if there is an imbalance between the amount of drainage through the circulating water drainage means 45 and the amount of drainage through the drainage tank drainage means 46, the drainage tank 52 may overflow. Therefore, the drainage tank drainage control means 102 controls the drainage tank drainage means 46 so that the water level of the drainage tank 52, as received by the drainage tank water level receiving means 104, is kept below a set value, and the water circulation control means 105 controls the flow of circulating water in cooperation with the drainage tank drainage control means 102 so that the amount of water stored in the circulating water tank 51, as received by the circulating water tank water level receiving means 103, is kept above a predetermined amount, and the water level of the drainage tank 52, as received by the drainage tank water level receiving means 104, is below a predetermined value. Regarding the management of the amount of wastewater, the water circulation control means 105 monitors the level fluctuations of the drainage tank 52, which is the destination for discharge, and the number of times or amount of water supplied by the circulating water drainage means 45, and controls and manages the amount of wastewater.

[0037] An air venting system may be used as the branch pipe for drainage, which houses the circulating water drainage means 45 for controlling the drainage and the drainage tank 52. The piping of the air venting system has a small diameter and allows for fine adjustment of the flow rate. If it is desired to increase the amount of drainage, the amount of drainage can be finely adjusted by simultaneously operating several of the multiple pumps installed in each of the multiple air venting systems to drain the water.

[0038] As shown in Figure 8, by utilizing continuous drainage, the process that took 11 days in the conventional comparative example shown in Figure 10 can be shortened to 4 days. The drainage volume of the conventional process was 1500 m³. 3 Drainage is possible. Since the water supply and air bleeding processes in the middle of the flushing process are unnecessary, the process can be shortened to water supply, flushing, continuous drainage, and warming.

[0039] (modified version) Figure 9, unlike Figure 8, shows a modified example in which flushing and drainage are performed simultaneously as appropriate. By performing the flushing process at night and adding a process to the recovery process of the gas heater device 200 in which water supply and drainage are performed simultaneously or consecutively, the commissioning process is shortened. The process is completed in 8 days, which is 3 days shorter than the 11 days in the comparative example.

[0040] Up to this point, the control system 100 for the flushing process of the water circulation piping 4 according to the present invention has been described. The present invention includes an information processing device 1 for controlling the control system 100 for the cleanup process of the water circulation piping 4, a program for causing the information processing device 1 to execute processing, and a method for controlling the cleanup process of the water circulation piping 4.

[0041] This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of the disclosure are considered to be within the scope of the present invention.

[0042] The control system 100, information processing device 1, program, and control method for the cleanup process of the water circulation piping 4 according to the above-described embodiment provide the following benefits.

[0043] (1) A control system 100 for the cleanup process of the water circulation piping 4 in a gas heater device 200 comprising a heat recovery unit 2 for recovering heat from the exhaust gas of a boiler 71, a heater 3 for raising the temperature of the processed gas to a predetermined temperature, a water circulation pipe 4 for circulating water between the heat recovery unit 2 and the heater 3, and a circulating water tank 51 connected to a branch pipe from the water circulation pipe 4 for storing water, comprises a water supply pipe 42 for supplying water to the water circulation piping 4, a water supply valve 47 provided in the water supply pipe 42, a circulating water drain pipe 43 provided as a branch to the water circulation piping 4, a circulating water draining means 45 for draining the water from the water circulation piping 4 into a drain pipe, a drain tank 52 for storing the wastewater discharged from the water circulation piping 4 through the circulating water drain pipe 43, a drain tank 52 draining means for sending the water from the drain tank 52 to a wastewater treatment device, a drain tank water level detector for detecting the amount of water in the drain tank 52, a circulating water tank water level detector for detecting the amount of water stored in the circulating water tank 51, and an information processing device The information processing device 1 includes a water supply valve control means 101 that controls the opening and closing of the water supply valve 47, a drain tank drainage control means 102 that controls the drain tank drainage means 52, a circulating water tank water level receiving means 103 that receives the amount of water stored in the tank from a circulating water tank water level detector, a drain tank water level receiving means 104 that receives the water level of the drain tank 52 from a drain tank water level detector, and a water circulation control means 105 that controls the amount of circulating water. In the flushing process of the water circulation piping 4, the drain tank drainage control means 102 controls the drain tank drainage means 46 so that the water level of the drain tank 52 received by the drain tank water level receiving means 104 is kept below a set value, and the water circulation control means 105 controls the circulating water so that the amount of water stored in the circulating water tank 51 received by the circulating water tank water level receiving means 103 is kept at or above a predetermined amount, and the water level of the drain tank 52 received by the drain tank water level receiving means 104 is below a predetermined value.

[0044] This provides a control system 100 for the cleanup process of the water circulation piping 4 in the gas heater device 200, which shortens the cleanup process of the water circulation piping 4.

[0045] (2) In the control system 100 for the cleanup process described in (1), the water circulation control means 105 controls at least one of the water supply valve 47 and the circulating water drainage means 45.

[0046] This makes it possible to control the amount of circulating water flowing through the water circulation pipe 4.

[0047] (3) In the control system 100 for the cleanup process described in (1) or (2), the water circulation control means 105 controls the water supply valve 47 and the circulating water drainage means 45 so that the amount of water supplied per unit time and the amount of circulating water drained per unit time are the same.

[0048] This makes it possible to maintain a constant flow rate of circulating water through the water circulation pipe 4. It also makes it possible to increase the flow rate of circulating water per unit time using the circulating water circulation means 44.

[0049] (4) In the control system 100 for the cleanup process described in any one of (1) to (3), the circulating water drain pipe 43 also serves as an air vent pipe.

[0050] This makes it possible to implement the cleanup process control system 100 even with existing gas heater equipment 200. Furthermore, by providing multiple air vent pipes and using some of them as circulating water drain pipes 43, the control of circulating water drainage can be made more precise.

[0051] (5) The information processing device 1 is a control system 100 for the cleanup process of the water circulation piping 4 in a gas heater device 200, which comprises: a heat recovery device 2 that recovers heat from the exhaust gas of a boiler 71; a heater 3 that raises the temperature of the processed gas to a predetermined temperature; a water circulation pipe 4 that circulates water between the heat recovery device 2 and the heater 3; a circulating water tank 51 connected to a branch pipe from the water circulation pipe 4 and storing water; a water supply pipe 42 that supplies water to the water circulation pipe 4; a water supply valve 47 provided on the water supply pipe 42; a circulating water drain pipe 43 branched off from the water circulation pipe 4; a circulating water draining means 45 that drains the water from the water circulation pipe 4 into a drain pipe; a drain tank 52 that stores the wastewater discharged from the water circulation pipe 4 through the circulating water drain pipe 43; a drain tank draining means 46 that sends the water from the drain tank 52 to a wastewater processing device; a drain tank water level detector that detects the amount of water in the drain tank 52; and a circulating water tank water level detector that detects the amount of water stored in the circulating water tank 51. The provided information processing device 1 includes a water supply valve control means 101 that controls the opening and closing of a water supply valve 47, a drain tank drainage control means 102 that controls a drain tank drainage means 46, a circulating water tank water level receiving means 103 that receives the amount of water stored in the tank from a circulating water tank water level detector, a drain tank water level receiving means 104 that receives the water level of the drain tank 52 from a drain tank 52 water level detector, and a water circulation control means 105 that controls the amount of circulating water. In the flushing process of the water circulation piping 4, the drain tank drainage control means 102 controls the drain tank drainage means 46 so that the water level of the drain tank 52 received by the drain tank water level receiving means 104 is kept below a set value, and the water circulation control means 105 controls the circulating water so that the amount of water stored in the circulating water tank 51 received by the circulating water tank water level receiving means 103 is kept at or above a predetermined amount, and the water level of the drain tank 52 received by the drain tank water level receiving means 104 is below a predetermined value.

[0052] This provides an information processing device 1 that controls the cleanup process of the water circulation piping 4 in the gas heater device 200, thereby shortening the cleanup process of the water circulation piping 4.

[0053] (6) The program is provided in a control system 100 for the cleanup process of the water circulation piping 4 in a gas heater device 200, which includes a heat recovery unit 2 for recovering heat from the exhaust gas of a boiler 71, a heater 3 for raising the temperature of the processed gas to a predetermined temperature, a water circulation pipe 4 for circulating water between the heat recovery unit 2 and the heater 3, a circulating water tank 51 connected to a branch pipe from the water circulation pipe 4 for storing water, a water supply pipe 42 for supplying water to the water circulation pipe 4, a water supply valve 47 provided in the water supply pipe 42, a circulating water drain pipe 43 branched off from the water circulation pipe 4, a circulating water draining means 45 for draining the water from the water circulation pipe 4 into a drain pipe, a drain tank 52 for storing the wastewater discharged from the water circulation pipe 4 through the circulating water drain pipe 43, a drain tank draining means 46 for sending the water from the drain tank 52 to a wastewater treatment device, a drain tank water level detector for detecting the amount of water in the drain tank 52, and a circulating water tank water level detector for detecting the amount of water stored in the circulating water tank 51. The information processing device 1 is instructed to execute the following: a water supply valve control means 101 that controls the opening and closing of the water supply valve 47; a drain tank drainage control means 102 that controls the drain tank drainage means 52; a circulating water tank water level receiving means 103 that receives the amount of water stored in the tank from a circulating water tank water level detector; a drain tank water level receiving means 104 that receives the water level of the drain tank 52 from a drain tank water level detector; and a water circulation control means 105 that controls the amount of circulating water. The flushing means of the water circulation piping 4 is instructed to execute the following: a drain tank drainage control means 102 that controls the drain tank drainage means 46 so that the water level of the drain tank 52 received by the drain tank water level detection means is kept below a set value; and a water circulation control means 105 that controls the circulating water so that the amount of water stored in the circulating water tank 51 received by the circulating water tank water level receiving means 103 is kept above a predetermined amount, and the water level of the drain tank 52 received by the drain tank water level receiving means 104 is below a predetermined value.

[0054] This controls the cleanup process of the water circulation piping 4 in the gas heater device 200, thereby shortening the process.

[0055] (7) A control method for the cleanup process of the water circulation piping 4 in the gas heater device 200 includes a heat recovery unit 2 that recovers heat from the exhaust gas of the boiler 71, a heater 3 that raises the temperature of the processed gas to a predetermined temperature, a water circulation piping 4 that circulates water between the heat recovery unit 2 and the heater 3, a circulating water tank 51 that stores water and is connected to a branch pipe from the water circulation piping 4, a water supply pipe 42 that supplies water to the water circulation piping 4, a water supply valve 47 provided in the water supply pipe 42, and a branch pipe 4 A gas heater device 200 comprising: a branched circulating water drain pipe 43; a circulating water draining means 45 for draining water from the water circulation piping 4 into the drain pipe; a drain tank 52 for storing wastewater discharged from the water circulation piping 4 through the circulating water drain pipe 43; a drain tank 52 draining means for sending the water from the drain tank 52 to a wastewater treatment device; a drain tank 52 water level detector for detecting the amount of water in the drain tank 52; and a circulating water tank 51 water level detector for detecting the amount of water stored in the circulating water tank 51. A method for controlling the cleanup process of a circulating pipe 4, comprising: a water supply valve 47 control step for controlling the opening and closing of a water supply valve 47; a drainage tank 52 drainage control step for controlling the drainage means of a drainage tank 52; a circulating water tank 51 water level detection step for receiving the amount of water stored in the tank from a circulating water tank 51 water level detector; a drainage tank 52 water level detection step for receiving the water level of the drainage tank 52 from a drainage tank 52 water level detector; and a water circulation control step for controlling the circulating water. The method further comprises: a drainage tank 52 drainage control step for controlling the drainage means of a drainage tank 52 so that the water level of the drainage tank 52 received by the drainage tank 52 water level detection means is kept below a set value; and a water circulation control step for controlling the amount of circulating water so that the amount of water stored in the circulating water tank 51 received by the circulating water tank 51 water level detection means is kept at or above a predetermined amount, and the water level of the drainage tank 52 received by the drainage tank 52 water level detection means is below a predetermined value.

[0056] This controls the cleanup process of the water circulation piping 4 in the gas heater device 200, thereby shortening the process. [Explanation of symbols]

[0057] 1. Information Processing Device 2 Heat recovery unit 3 Heater 4 Water circulation piping 10 Control Unit 11 processors 12 ROM 13 RAM 14 bus 15 Input / Output Interfaces 16 Input / output section 17. Means of communication 18 Memory section 19 signal lines 41 First branch pipe 42 Water supply pipe 43 Circulating water drain pipe 44 Circulating water circulation means 45 Circulating water drainage means 46 Drainage tank drainage means 47 Water supply valve 51 Circulating water tank 52 Drain tank 71 Boiler 72 Electrostatic precipitator 73 Desulfurization equipment 74 Exhaust system 100 Control system for the flushing process of a gas heater device 101 Water supply valve control means 102 Drainage tank drainage control means 103 Circulating water tank water level receiving means 104 Drainage tank water level receiving means 105 Water circulation control means 200 Gas heater device

Claims

1. A heat recovery unit that recovers heat from the exhaust gas of a boiler, a heater that raises the temperature of the processed gas to a predetermined temperature, a water circulation pipe that circulates water between the heat recovery unit and the heater, and a circulating water tank connected to a branch pipe from the water circulation pipe to store water, A control system for the cleanup process of the water circulation piping in a gas heater device comprising the following: A water supply pipe that supplies water to the aforementioned water circulation piping, A water supply valve is provided in the water supply pipe, A circulating water drain pipe is provided branching off from the aforementioned water circulation piping, A circulating water drainage means for draining the water from the water circulation piping into a drain pipe, A drainage tank for collecting wastewater discharged from the water circulation piping through the aforementioned circulating water drainage pipe, A drainage tank means for sending the water from the drainage tank to a drainage treatment device, A drain tank water level detector for detecting the water level in the drain tank, A circulating water tank water level detector for detecting the amount of water stored in the circulating water tank, Information processing device and It has, The aforementioned information processing device is A water supply valve control means for controlling the opening and closing of the water supply valve, A drainage tank drainage control means for controlling the drainage tank drainage means, A circulating water tank water level receiving means that receives the amount of water stored in the circulating water tank from the circulating water tank water level detector, A drainage tank water level receiving means that receives the water level of the drainage tank from the drainage tank water level detector, A water circulation control means for controlling circulating water, It has, In the flushing process of the water circulation piping, The drainage tank drainage control means controls the drainage tank drainage means so that the water level of the drainage tank received by the drainage tank water level receiving means is kept below a set value. The water circulation control means controls the circulating water so that the amount of water stored in the circulating water tank, as received by the circulating water tank water level receiving means, is maintained at or above a predetermined amount, and the water level in the drainage tank, as received by the drainage tank water level receiving means, is below a predetermined value. A control system for the cleanup process.

2. The water circulation control means controls at least one of the water supply valve and the circulating water drainage means. A control system for the cleanup process according to claim 1.

3. The water circulation control means controls the water supply valve and the circulating water drainage means so that the amount of water supplied per unit time and the amount of circulating water drained per unit time are the same. A control system for the cleanup process according to claim 1 or claim 2.

4. The aforementioned circulating water drain pipe also serves as an air vent pipe. A control system for the cleanup process according to claim 1 or claim 2.

5. A heat recovery unit that recovers heat from the exhaust gas of a boiler, a heater that raises the temperature of the processed gas to a predetermined temperature, a water circulation pipe that circulates water between the heat recovery unit and the heater, and a circulating water tank connected to a branch pipe from the water circulation pipe to store water, A water supply pipe that supplies water to the aforementioned water circulation piping, A water supply valve is provided in the water supply pipe, A circulating water drain pipe is provided branching off from the aforementioned water circulation piping, A circulating water drainage means for draining the water from the water circulation piping into a drain pipe, A drainage tank for collecting wastewater discharged from the water circulation piping through the aforementioned circulating water drainage pipe, A drainage tank means for sending the water from the drainage tank to a drainage treatment device, A drain tank water level detector for detecting the water level in the drain tank, A circulating water tank water level detector for detecting the amount of water stored in the circulating water tank, An information processing device provided in a control system for the cleanup process of the water circulation piping in a gas heater device comprising: A water supply valve control means for controlling the opening and closing of the water supply valve, A drainage tank drainage control means for controlling the drainage tank drainage means, A circulating water tank water level receiving means that receives the amount of water stored in the tank from the circulating water tank water level detector, A drainage tank water level receiving means that receives the water level of the drainage tank from the drainage tank water level detector, A water circulation control means for controlling the amount of circulating water, It has, In the flushing process of the water circulation piping, The drainage tank drainage control means controls the drainage tank drainage means so that the water level of the drainage tank received by the drainage tank water level receiving means is kept below a set value, The water circulation control means controls the circulating water so that the amount of water stored in the circulating water tank, as received by the circulating water tank water level receiving means, is maintained at or above a predetermined amount, and the water level in the drainage tank, as received by the drainage tank water level receiving means, is below a predetermined value. An information processing device having

6. A heat recovery unit that recovers heat from the exhaust gas of a boiler, a heater that raises the temperature of the processed gas to a predetermined temperature, a water circulation pipe that circulates water between the heat recovery unit and the heater, and a circulating water tank connected to a branch pipe from the water circulation pipe to store water, A water supply pipe that supplies water to the aforementioned water circulation piping, A water supply valve is provided in the water supply pipe, A circulating water drain pipe is provided branching off from the aforementioned water circulation piping, A circulating water drainage means for draining the water from the water circulation piping into a drain pipe, A drainage tank for collecting wastewater discharged from the water circulation piping through the aforementioned circulating water drainage pipe, A drainage tank means for sending the water from the drainage tank to a drainage treatment device, A drain tank water level detector for detecting the water level in the drain tank, A circulating water tank water level detector for detecting the amount of water stored in the circulating water tank, An information processing device provided in the control system for the cleanup process of the water circulation piping in a gas heater device equipped with the following: A water supply valve control means for controlling the opening and closing of the water supply valve, A drainage tank drainage control means for controlling the drainage tank drainage means, A circulating water tank water level receiving means that receives the amount of water stored in the tank from the circulating water tank water level detector, A drainage tank water level receiving means that receives the water level of the drainage tank from the drainage tank water level detector, A water circulation control means for controlling the amount of circulating water, Make it run, In the flushing means of the water circulation piping, The drainage tank drainage control means controls the drainage tank drainage means so that the water level of the drainage tank received by the drainage tank water level receiving means is kept below a set value, The water circulation control means controls the circulating water so that the amount of water stored in the circulating water tank, as received by the circulating water tank water level receiving means, is maintained at or above a predetermined amount, and the water level in the drainage tank, as received by the drainage tank water level receiving means, is below a predetermined value. A program that executes the command.

7. A heat recovery unit that recovers heat from the exhaust gas of a boiler, a heater that raises the temperature of the processed gas to a predetermined temperature, a water circulation pipe that circulates water between the heat recovery unit and the heater, and a circulating water tank connected to a branch pipe from the water circulation pipe to store water, A water supply pipe that supplies water to the aforementioned water circulation piping, A water supply valve is provided in the water supply pipe, A circulating water drain pipe is provided branching off from the aforementioned water circulation piping, A circulating water drainage means for draining the water from the water circulation piping into a drain pipe, A drainage tank for collecting wastewater discharged from the water circulation piping through the aforementioned circulating water drainage pipe, A drainage tank means for sending the water from the drainage tank to a drainage treatment device, A drain tank water level detector for detecting the water level in the drain tank, A circulating water tank water level detector for detecting the amount of water stored in the circulating water tank, A control method for the cleanup process of the water circulation piping in a gas heater device comprising the following: A water supply valve control step that controls the opening and closing of the water supply valve, A drainage tank drainage control step for controlling the drainage means of the drainage tank, A circulating water tank water level detection step which receives the amount of water stored in the tank from the circulating water tank water level detector, A drain tank water level detection step in which the water level of the drain tank is received from the drain tank water level detector, A water circulation control step that controls the amount of circulating water, It has, In the flushing process of the water circulation piping, A drainage tank drainage control step that controls the drainage tank drainage means so that the water level of the drainage tank received by the drainage tank water level receiving means is kept below a set value, The water circulation control step controls the circulating water so that the amount of water stored in the circulating water tank, as received by the circulating water tank water level receiving means, is maintained at or above a predetermined amount, and the water level in the drainage tank, as received by the drainage tank water level receiving means, is below a predetermined value. A method for controlling a cleanup process having the following characteristics.

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