Control method and device of flue gas cooling system

Abstract

The invention discloses a control method and device for a flue gas cooling system, and the method comprises the steps: initializing spraying cooling liquid in a first-section spraying pump, a second-section spraying pump, a third-section spraying pump and a fourth-section spraying pump in a spraying cooling tower until the spraying cooling liquid reaches a corresponding preset value; the pressure and temperature of a first-section spraying pipeline and the first-section spraying liquid level are monitored through a first-section spraying pump, and corresponding first operation is executed; monitoring the pressure and temperature of a second-section spraying pipeline and the second-section spraying liquid level through a second-section spraying pump, and executing corresponding second operation; monitoring the pressure and temperature of a three-section spraying pipeline and the three-section spraying liquid level through a three-section spraying pump, and executing corresponding third operation; and monitoring the pressure and temperature of a four-section spraying pipeline, the four-section spraying liquid level and the calcium chloride solution density through a four-section spraying pump, and executing corresponding fourth operation. The operation stability of the system is improved, misoperation of personnel is prevented, and the labor intensity of the operation personnel is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas cooling, and in particular to a control method and device for a flue gas cooling system. Background Art

[0002] In the existing flue gas cooling system, personnel are required to be on duty to ensure that the flue gas cooling system completes the cooling process. However, the above-mentioned existing technology relies on manual operation and requires a high labor intensity of personnel. If manual misoperation occurs, it will cause incalculable losses. Based on this, how to realize the automatic operation of the above-mentioned flue gas cooling system so that the flue gas cooling system can reach an unmanned control level is an urgent problem to be solved. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the present invention proposes a control method for a flue gas cooling system, which can cool the spray cooling tower through a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, limit the starting conditions of each device and valve, improve the stability of system operation, enable the flue gas cooling system to achieve an unattended control level, prevent personnel from operating incorrectly, and reduce the labor intensity of operators.

[0005] Another object of the present invention is to provide a control device for a flue gas cooling system.

[0006] To achieve the above object, the present invention provides a control method for a flue gas cooling system, which is applied to the flue gas cooling system. The flue gas cooling system includes a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump. The method includes:

[0007] In response to the initial startup of the flue gas cooling system, the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump and the fourth-stage spray pump in the spray cooling tower is initialized until the spray coolant reaches a corresponding preset value;

[0008] The pressure and temperature of a section of the spray pipeline and the spray liquid level of a section are monitored by the section of the spray pump, and a corresponding first operation is performed;

[0009] The pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level are monitored by the second-stage spray pump, and a corresponding second operation is performed;

[0010] The pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level are monitored by the three-stage spray pump, and a corresponding third operation is performed;

[0011] The pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution are monitored by the four-stage spray pump, and the corresponding fourth operation is performed.

[0012] The control method of the flue gas cooling system of the embodiment of the present invention may also have the following additional technical features:

[0013] In one embodiment of the present invention, the initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump, and the fourth-stage spray pump in the spray cooling tower until the spray coolant reaches a corresponding preset value includes:

[0014] Opening a return valve, an inlet valve, an outlet valve and an inlet valve of the spray pump until a liquid level in a section of the first spray pump reaches a first preset value, and then stopping the operation of the spray pump;

[0015] Open the second-stage return water valve, the second-stage spray pump inlet valve, the second-stage spray pump outlet valve and the second-stage water inlet valve in the second-stage spray pump until the second-stage liquid level in the first spray pump reaches a second preset value, and then stop running the second-stage spray pump;

[0016] Open the three-stage return valve, the three-stage spray pump inlet valve, the three-stage spray pump outlet valve and the three-stage water inlet valve in the three-stage spray pump until the three-stage liquid level in the third spray pump reaches a second preset value, and then stop running the three-stage spray pump;

[0017] Open the four-stage return valve, the four-stage spray pump inlet valve, the four-stage spray pump outlet valve and the four-stage water inlet valve in the four-stage spray pump until the four-stage liquid level in the fourth spray pump reaches a second preset value, and then stop running the four-stage spray pump.

[0018] In one embodiment of the present invention, the flue gas cooling system further includes a water pump and a lower wastewater pump; the pressure and temperature of a section of the spray pipeline and a section of the spray liquid level are monitored by the section of the spray pump, and the corresponding first operation is performed, including:

[0019] If the temperature of the section of the spray pipe is greater than or equal to the first temperature, or the pressure of the section of the spray pipe is less than the first pressure, another water pump is started in a chain manner;

[0020] If the first stage spraying liquid level is greater than the first liquid level, the next stage wastewater pump is started in a chain manner and the second stage to the first stage water supply valve cycle is skipped;

[0021] If the first spraying liquid level is lower than the second liquid level, the lower wastewater pump is interlocked and shut down.

[0022] In one embodiment of the present invention, the flue gas cooling system further includes a cold recovery device and a water pump; the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level are monitored by the second-stage spray pump, and the corresponding second operation is performed, including:

[0023] If the pressure of the second-stage spray pipe is lower than the second pressure, another spray pump is started interlockingly to maintain the system pressure stable;

[0024] If the temperature of the second-stage spraying flue gas in the second-stage spraying is greater than the second temperature, increasing the flow rate through the cold recovery device and the flow rate through the water cooler;

[0025] If the second stage spraying liquid level is lower than the third liquid level, the water supply valve from the second stage to the first stage is closed;

[0026] If the second-stage spraying liquid level is lower than the fourth liquid level, the process water pump is turned on to replenish water for the flue gas cooling system.

[0027] In one embodiment of the present invention, the flue gas cooling system further includes a medium-temperature refrigerator and a process water pump; the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level are monitored by the three-stage spray pump, and the corresponding third operation is performed, including:

[0028] When the pressure of the three sections of the spray pipe is lower than the third pressure, another water pump is started in a chain manner;

[0029] If the temperature of the three-stage spray flue gas in the three-stage spray pipe is greater than the third temperature, the outlet water temperature of the medium-temperature refrigerator is reduced; if the temperature of the three-stage spray pipe cannot be reduced to below the third temperature, another spray pump is interlocked to increase the flow rate;

[0030] If the three-stage spraying liquid level is lower than the fourth liquid level, the process water pump is turned on to replenish water for the flue gas cooling system.

[0031] In one embodiment of the present invention, the flue gas cooling system further includes a low-temperature refrigerator, a calcium chloride solution replenishment pump and an MVR concentration system; the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution are monitored by the four-stage spray pump, and the corresponding fourth operation is performed, including:

[0032] If the pressure of the four sections of the spray pipe is lower than the fourth pressure, another water pump is started in a chain to maintain the system pressure stable;

[0033] If the temperature of the four sections of the spray pipe is greater than the fourth temperature, the outlet water temperature of the low-temperature refrigerator is reduced. If the temperature of the four sections of the spray pipe cannot be reduced to below the fourth temperature, another spray pump is interlocked to increase the flow rate;

[0034] If the four-stage spraying liquid level is greater than the first liquid level, the valve of the calcium chloride solution emergency discharge pipeline is opened; when the four-stage spraying liquid level drops below the fifth liquid level, the valve of the calcium chloride solution emergency discharge pipeline is closed;

[0035] If the four-stage spraying liquid level is less than the first preset value, the calcium chloride solution replenishing pump is started in a chain manner until the four-stage spraying liquid level rises to the sixth liquid level, and the replenishing pump stops;

[0036] If the density of the calcium chloride solution is less than the first density, the valve is adjusted to increase the flow to the MVR concentration system to increase the evaporation amount;

[0037] If the density of the calcium chloride solution is greater than the second density, the valve is adjusted to reduce the flow to the MVR concentration system and reduce the evaporation amount.

[0038] In one embodiment of the present invention, the flue gas cooling system further comprises a cold recovery pump and a cold recovery tower; the method further comprises:

[0039] Initializing the cold recovery tower liquid in the cold recovery pump until the cold recovery tower liquid reaches a corresponding second preset value;

[0040] The pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower are monitored by the cold recovery pump, and the corresponding fifth operation is performed.

[0041] In one embodiment of the present invention, the pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower are monitored by the cold recovery pump, and the corresponding fifth operation is performed, including:

[0042] If the pressure of the cold recovery pipeline is lower than the first pressure, another water pump is started in a chain to maintain the system pressure stable;

[0043] If the liquid level in the cold recovery tower is greater than the first liquid level, the valve of the sewage pipe is opened, and when the liquid in the cold recovery tower drops below the fifth liquid level, the valve is closed;

[0044] If the liquid level in the cold recovery tower is lower than the first preset value, the valve of the liquid replenishment pipeline is opened, and when the liquid level rises to the sixth liquid level, the liquid replenishment is stopped.

[0045] To achieve the above object, the present invention provides a control device for a flue gas cooling system, which is applied to a flue gas cooling system. The flue gas cooling system includes a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump. The device includes:

[0046] an initialization module, for initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump, and the fourth-stage spray pump in the spray cooling tower in response to the initial startup of the flue gas cooling system, until the spray coolant reaches a corresponding preset value;

[0047] A first monitoring module, used to monitor the pressure and temperature of a section of the spray pipeline and a section of the spray liquid level through the section of the spray pump, and perform a corresponding first operation;

[0048] A second monitoring module is used to monitor the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level through the second-stage spray pump, and perform a corresponding second operation;

[0049] A third monitoring module is used to monitor the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level through the three-stage spray pump, and perform a corresponding third operation;

[0050] The fourth monitoring module is used to monitor the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution through the four-stage spray pump, and perform the corresponding fourth operation.

[0051] Another object of the present invention is to provide an electronic device, comprising:

[0052] at least one processor; and

[0053] a memory communicatively connected to the at least one processor; wherein,

[0054] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods described in the above aspect.

[0055] Another object of the present invention is to provide a computer storage medium, wherein the computer storage medium stores computer executable instructions; after the computer executable instructions are executed by a processor, the computer executes any one of the methods described in the above aspect.

[0056] The control method and device of the flue gas cooling system of the embodiment of the present invention can cool the spray cooling tower through a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, limit the starting conditions of each device and valve, improve the stability of system operation, enable the flue gas cooling system to achieve an unattended control level, prevent personnel from operating incorrectly, and reduce the labor intensity of operators.

[0057] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0059] Figure 1 is a flow chart of a control method of a flue gas cooling system according to an embodiment of the present invention;

[0060] Figure 2 is a structural diagram of a control device for a flue gas cooling system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0062] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0063] The following describes a control method and device for a flue gas cooling system according to an embodiment of the present invention with reference to the accompanying drawings.

[0064] Figure 1 4 is a flow chart of a control method of a flue gas cooling system according to an embodiment of the present invention.

[0065] like Figure 1 As shown, the method includes:

[0066] S1, in response to the initial startup of the flue gas cooling system, initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump and the fourth-stage spray pump in the spray cooling tower until the spray coolant reaches a corresponding preset value;

[0067] In one embodiment of the present invention, the control method of the flue gas cooling system is applied to the flue gas cooling system, which may include a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump, a fourth-stage spray pump, a water pump, a lower-stage wastewater pump, a cold recovery device, a medium-temperature refrigerator, a process water pump, a low-temperature refrigerator, a calcium chloride solution replenishment pump, an MVR concentration system, a cold recovery pump and a cold recovery tower.

[0068] In one embodiment of the present invention, the method for initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump, and the fourth-stage spray pump in the spray cooling tower until the spray coolant reaches the corresponding preset value may include the following steps:

[0069] S11, opening a return valve, an inlet valve, an outlet valve and an inlet valve of a spray pump in a first stage, until a liquid level in a first spray pump reaches a first preset value, and then stopping the operation of the first stage spray pump;

[0070] S12, opening the second-stage return valve, the second-stage spray pump inlet valve, the second-stage spray pump outlet valve and the second-stage water inlet valve in the second-stage spray pump until the second-stage liquid level in the first spray pump reaches a second preset value, and then stopping the operation of the second-stage spray pump;

[0071] S13, opening the three-stage return valve, the three-stage spray pump inlet valve, the three-stage spray pump outlet valve and the three-stage water inlet valve in the three-stage spray pump until the three-stage liquid level in the third spray pump reaches a second preset value, and then stopping the operation of the three-stage spray pump;

[0072] S14, open the four-stage return valve, the four-stage spray pump inlet valve, the four-stage spray pump outlet valve and the four-stage water inlet valve in the four-stage spray pump until the four-stage liquid level in the fourth spray pump reaches the second preset value, and then stop running the four-stage spray pump.

[0073] In one embodiment of the present invention, the first preset value and the second preset value may be set according to manual experience. For example, the first preset value is 0.4 m and the second preset value is 0.2 m.

[0074] S2, monitoring the pressure and temperature of a section of the spray pipe and the spray liquid level of a section through a spray pump, and performing a corresponding first operation;

[0075] In one embodiment of the present invention, the method of monitoring the pressure and temperature of a section of the spray pipeline and the spray liquid level of a section through a spray pump and performing the corresponding first operation may include the following steps:

[0076] S21, if the temperature of a section of the spray pipe is greater than or equal to the first temperature, or the pressure of a section of the spray pipe is less than the first pressure, another water pump is started in a chain manner;

[0077] S22, if the first stage spraying liquid level is greater than the first liquid level, the next stage wastewater pump is started in a chain manner and the second stage to the first stage water supply valve cycle is skipped;

[0078] S23, if the first spraying liquid level is lower than the second liquid level, the next wastewater pump is shut down.

[0079] Among them, in one embodiment of the present invention, the above-mentioned second-stage to first-stage water supply valve is opened in a fixed period, each time for 30 seconds, with an interval of 1 hour, and the opening time and interval time are adjustable.

[0080] Furthermore, in one embodiment of the present invention, the first temperature, the first pressure, the first liquid level and the second liquid level can be set according to manual experience. For example, the first temperature is 50°C, the first pressure is 0.2Mpa, the first liquid level is 1.2 meters and the second liquid level is 0.8 meters.

[0081] S3, monitoring the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level through the second-stage spray pump, and performing the corresponding second operation;

[0082] In one embodiment of the present invention, the method of monitoring the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level by the second-stage spray pump and performing the corresponding second operation may include the following steps:

[0083] S31, if the pressure of the second-stage spray pipe is lower than the second pressure, another spray pump is started interlocking to maintain the system pressure stable;

[0084] S32, if the temperature of the second-stage spray flue gas in the second-stage spray pipeline is greater than the second temperature, increasing the flow rate through the cold recovery device and the flow rate of the water cooler;

[0085] S33, if the second stage spraying liquid level is lower than the third liquid level, closing the second stage to the first stage water replenishment valve;

[0086] S34, if the second-stage spraying liquid level is less than the fourth liquid level, start the process water pump to replenish water for the flue gas cooling system.

[0087] In one embodiment of the present invention, the second pressure, second temperature, third liquid level and fourth liquid level can be set according to manual experience. For example, the second pressure is 0.25Mpa, the second temperature is 35°C, the third liquid level is 0.5m and the fourth liquid level is 0.3m.

[0088] S4, monitoring the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level through the three-stage spray pump, and performing the corresponding third operation;

[0089] Among them, in one embodiment of the present invention, the method of monitoring the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level through the three-stage spray pump and performing the corresponding third operation may include the following steps:

[0090] S41, when the pressure of the three-section spray pipe is lower than the third pressure, another water pump is started in a chain manner;

[0091] S42, if the temperature of the three-stage spray flue gas in the three-stage spray pipe is greater than the third temperature, then lower the outlet water temperature of the medium-temperature refrigerator; if the temperature of the three-stage spray pipe cannot be lowered below the third temperature, interlock and start another spray pump to increase the flow rate;

[0092] S43, if the third-stage spraying liquid level is less than the fourth liquid level, the process water pump is turned on to replenish water for the flue gas cooling system.

[0093] In one embodiment of the present invention, the third pressure, the third temperature and the fourth liquid level can be set according to manual experience. For example, the third pressure is 0.35 MPa, the third temperature is 10° C. and the fourth liquid level is 0.3 m.

[0094] S5, monitoring the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution through the four-stage spray pump, and executing the corresponding fourth operation.

[0095] Wherein, in one embodiment of the present invention, the method of monitoring the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution by the four-stage spray pump and performing the corresponding fourth operation may include the following steps:

[0096] S51, if the pressure of the four-section spray pipe is lower than the fourth pressure, another water pump is started in a chain to maintain the system pressure stable;

[0097] S52, if the temperature of the four sections of the spray pipe is greater than the fourth temperature, the outlet water temperature of the low-temperature refrigerator is reduced; if the temperature of the four sections of the spray pipe cannot be reduced to below the fourth temperature, another spray pump is interlocked to increase the flow rate;

[0098] S53, if the fourth-stage spraying liquid level is greater than the first liquid level, the valve of the calcium chloride solution emergency discharge pipeline is opened, and when the fourth-stage spraying liquid level drops below the fifth liquid level, the valve of the calcium chloride solution emergency discharge pipeline is closed;

[0099] S54, if the four-stage spraying liquid level is less than the first preset value, the calcium chloride solution replenishing pump is started in a chain manner until the four-stage spraying liquid level rises to the sixth liquid level, and the replenishing pump stops;

[0100] S55, if the density of the calcium chloride solution is less than the first density, the valve is adjusted to increase the flow to the MVR concentration system and increase the evaporation amount;

[0101] S56, if the density of the calcium chloride solution is greater than the second density, the valve is adjusted to reduce the flow to the MVR concentration system and reduce the evaporation amount.

[0102] In one embodiment of the present invention, the fourth pressure, fourth temperature, fifth liquid level and sixth liquid level can be set according to manual experience. For example, the fourth pressure is 0.4 MPa, the fourth temperature is -10°C, the fifth liquid level is 1 m and the sixth liquid level is 0.6 m.

[0103] And, in one embodiment of the present invention, the above-mentioned one-stage spray pump, two-stage spray pump, three-stage spray pump and four-stage spray pump each include two, one of which is in operation and the other is in standby to avoid stopping operation when a running spray pump fails.

[0104] Furthermore, in one embodiment of the present invention, the above method may also include: initializing the cold recovery tower liquid in the cold recovery pump until the cold recovery tower liquid reaches the corresponding second preset value, and monitoring the pressure and temperature of the cold recovery pipeline and the cold recovery tower liquid level through the cold recovery pump, and performing the corresponding fifth operation.

[0105] In one embodiment of the present invention, the method of monitoring the pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower by the cold recovery pump and performing the corresponding fifth operation may include the following steps:

[0106] Step 1: If the pressure of the cold recovery pipeline is lower than the first pressure, another water pump is started in a chain to maintain the system pressure stable;

[0107] Step 2: If the liquid level in the cold recovery tower is greater than the first liquid level, open the drain pipe valve; when the liquid level in the cold recovery tower drops below the fifth liquid level, close the valve;

[0108] Step 3: If the liquid level in the cold recovery tower is lower than the first preset value, the valve of the liquid replenishment pipeline is opened, and when the liquid level rises to the sixth liquid level, the liquid replenishment is stopped.

[0109] According to the control method of the flue gas cooling system of the embodiment of the present invention, the method can cool the spray cooling tower through a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, limit the starting conditions of each device and valve, improve the stability of system operation, enable the flue gas cooling system to reach an unattended control level, prevent personnel from operating incorrectly, and reduce the labor intensity of operators.

[0110] In order to implement the above embodiment, Figure 2 As shown, the present embodiment also provides a control device 10 for a flue gas cooling system, the flue gas cooling system includes a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, the device includes:

[0111] Initialization module 201, for initializing the spray coolant in the first stage spray pump, the second stage spray pump, the third stage spray pump and the fourth stage spray pump in the spray cooling tower in response to the initial startup of the flue gas cooling system, until the spray coolant reaches the corresponding preset value;

[0112] The first monitoring module 202 is used to monitor the pressure and temperature of a section of the spray pipeline and the spray liquid level of a section through a section of the spray pump, and perform a corresponding first operation;

[0113] The second monitoring module 203 is used to monitor the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level through the second-stage spray pump, and perform a corresponding second operation;

[0114] The third monitoring module 204 is used to monitor the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level through the three-stage spray pump, and perform the corresponding third operation;

[0115] The fourth monitoring module 205 is used to monitor the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution through the four-stage spray pump, and perform the corresponding fourth operation.

[0116] In one embodiment of the present invention, the initialization module 201 is specifically used for:

[0117] Opening a return valve, an inlet valve, an outlet valve and an inlet valve of a spray pump in a first spray pump until a liquid level in a first spray pump reaches a first preset value, and then stopping the operation of the first spray pump;

[0118] Open the second-stage return water valve, the second-stage spray pump inlet valve, the second-stage spray pump outlet valve and the second-stage water inlet valve in the second-stage spray pump until the second-stage liquid level in the first spray pump reaches a second preset value, and then stop running the second-stage spray pump;

[0119] Open the three-stage return valve, the three-stage spray pump inlet valve, the three-stage spray pump outlet valve and the three-stage water inlet valve in the three-stage spray pump until the three-stage liquid level in the third spray pump reaches the second preset value, and then stop running the three-stage spray pump;

[0120] Open the four-stage return valve, the four-stage spray pump inlet valve, the four-stage spray pump outlet valve and the four-stage water inlet valve in the four-stage spray pump until the four-stage liquid level in the fourth spray pump reaches the second preset value, and then stop running the four-stage spray pump.

[0121] Furthermore, in one embodiment of the present invention, the flue gas cooling system further includes a water pump and a lower wastewater pump; the first monitoring module 202 is specifically used for:

[0122] If the temperature of a section of the spray pipe is greater than or equal to the first temperature, or the pressure of a section of the spray pipe is less than the first pressure, another water pump is started in a chain manner;

[0123] If the first stage spraying liquid level is greater than the first liquid level, the next stage wastewater pump will be started in a chain manner and the second stage to the first stage water supply valve cycle will be skipped;

[0124] If the first spraying liquid level is lower than the second liquid level, the lower wastewater pump will be shut down.

[0125] Furthermore, in one embodiment of the present invention, the flue gas cooling system further includes a cold recovery device and a process water pump; the second monitoring module 203 is specifically used for:

[0126] If the pressure of the second-stage spray pipe is lower than the second pressure, the other spray pump will be started through interlock to maintain the system pressure stable;

[0127] If the temperature of the second-stage spraying flue gas is greater than the second temperature during the second-stage spraying, the flow rate through the cold recovery device and the flow rate through the water cooler are increased;

[0128] If the second stage spraying liquid level is lower than the third level, close the water supply valve from the second stage to the first stage;

[0129] If the second-stage spray liquid level is lower than the fourth liquid level, start the process water pump to replenish water for the flue gas cooling system.

[0130] Furthermore, in one embodiment of the present invention, the flue gas cooling system further includes a medium temperature refrigerator and a process water pump; the third monitoring module 204 is specifically used for:

[0131] When the pressure of the three-section spray pipe is lower than the third pressure, another water pump will be started in a chain manner;

[0132] If the temperature of the three-stage spray flue gas in the three-stage spray pipe is greater than the third temperature, the outlet water temperature of the medium-temperature refrigerator is reduced. If the temperature of the three-stage spray pipe cannot be reduced to below the third temperature, another spray pump is interlocked to increase the flow rate;

[0133] If the third-stage spray liquid level is lower than the fourth liquid level, start the process water pump to replenish water for the flue gas cooling system.

[0134] Furthermore, in one embodiment of the present invention, the flue gas cooling system further includes a low-temperature refrigerator, a calcium chloride solution replenishment pump and an MVR concentration system; the fourth monitoring module 205 is specifically used for:

[0135] If the pressure of the four-section sprinkler pipe is lower than the fourth pressure, another water pump will be started in a chain to maintain the system pressure stable;

[0136] If the temperature of the four-section spray pipe is greater than the fourth temperature, the outlet water temperature of the low-temperature refrigerator is reduced. If the temperature of the four-section spray pipe cannot be reduced to below the fourth temperature, another spray pump is interlocked to increase the flow rate.

[0137] If the fourth-stage spraying liquid level is greater than the first liquid level, the valve of the calcium chloride solution emergency discharge pipeline is opened; when the fourth-stage spraying liquid level drops below the fifth liquid level, the valve of the calcium chloride solution emergency discharge pipeline is closed;

[0138] If the four-stage spraying liquid level is less than the first preset value, the calcium chloride solution replenishing pump is started in a chain manner until the four-stage spraying liquid level rises to the sixth liquid level, and then the replenishing pump stops;

[0139] If the density of the calcium chloride solution is less than the first density, adjust the valve to increase the flow to the MVR concentration system and increase the evaporation capacity;

[0140] If the density of the calcium chloride solution is greater than the second density, adjust the valve to reduce the flow to the MVR concentration system and reduce the evaporation amount.

[0141] Furthermore, in one embodiment of the present invention, the flue gas cooling system further comprises a cold recovery pump and a cold recovery tower; the device is also used for:

[0142] Initializing the cold recovery tower liquid in the cold recovery pump until the cold recovery tower liquid reaches a corresponding second preset value;

[0143] The pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower are monitored by the cold recovery pump, and the corresponding fifth operation is performed.

[0144] Furthermore, in one embodiment of the present invention, the above device is also used for:

[0145] If the pressure of the cold recovery pipeline is lower than the first pressure, another water pump will be started in a chain to maintain the system pressure stable;

[0146] If the liquid level in the cold recovery tower is greater than the first liquid level, the valve of the sewage pipe is opened, and when the liquid level in the cold recovery tower drops below the fifth liquid level, the valve is closed;

[0147] If the liquid level in the cold recovery tower is lower than the first preset value, the valve of the liquid replenishment pipeline is opened, and when the liquid level rises to the sixth liquid level, the liquid replenishment is stopped.

[0148] According to the control device of the flue gas cooling system of the embodiment of the present invention, the device can cool the spray cooling tower through a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, limit the start-up conditions of each device and valve, improve the stability of system operation, enable the flue gas cooling system to reach an unattended control level, prevent personnel from operating incorrectly, and reduce the labor intensity of operators.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0150] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A control method for a flue gas cooling system, characterized in that: Applied to a flue gas cooling system, the flue gas cooling system includes a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, the method includes: In response to the initial startup of the flue gas cooling system, the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump and the fourth-stage spray pump in the spray cooling tower is initialized until the spray coolant reaches a corresponding preset value; The pressure and temperature of a section of the spray pipeline and the spray liquid level of a section are monitored by the section of the spray pump, and a corresponding first operation is performed; The pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level are monitored by the second-stage spray pump, and a corresponding second operation is performed; The pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level are monitored by the three-stage spray pump, and a corresponding third operation is performed; The pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution are monitored by the four-stage spray pump, and the corresponding fourth operation is performed.

2. The method according to claim 1, characterized in that Initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump, and the fourth-stage spray pump in the spray cooling tower until the spray coolant reaches a corresponding preset value includes: Opening a return valve, an inlet valve, an outlet valve and an inlet valve of the spray pump until a liquid level in a section of the first spray pump reaches a first preset value, and then stopping the operation of the spray pump; Open the second-stage return water valve, the second-stage spray pump inlet valve, the second-stage spray pump outlet valve and the second-stage water inlet valve in the second-stage spray pump until the second-stage liquid level in the first spray pump reaches a second preset value, and then stop running the second-stage spray pump; Open the three-stage return valve, the three-stage spray pump inlet valve, the three-stage spray pump outlet valve and the three-stage water inlet valve in the three-stage spray pump until the three-stage liquid level in the third spray pump reaches a second preset value, and then stop running the three-stage spray pump; Open the four-stage return valve, the four-stage spray pump inlet valve, the four-stage spray pump outlet valve and the four-stage water inlet valve in the four-stage spray pump until the four-stage liquid level in the fourth spray pump reaches a second preset value, and then stop running the four-stage spray pump.

3. The method according to claim 1, characterized in that The flue gas cooling system further includes a water pump and a lower wastewater pump; the pressure and temperature of a section of the spray pipeline and a section of the spray liquid level are monitored by the section of the spray pump, and a corresponding first operation is performed, including: If the temperature of the section of the spray pipe is greater than or equal to the first temperature, or the pressure of the section of the spray pipe is less than the first pressure, another water pump is started in a chain manner; If the first stage spraying liquid level is greater than the first liquid level, the next stage wastewater pump is started in a chain manner and the second stage to the first stage water supply valve cycle is skipped; If the first spraying liquid level is lower than the second liquid level, the lower wastewater pump is interlocked and shut down.

4. The method according to claim 1, characterized in that: The flue gas cooling system further includes a cold recovery device and a process water pump; the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level are monitored by the second-stage spray pump, and the corresponding second operation is performed, including: If the pressure of the second-stage spray pipe is lower than the second pressure, another spray pump is started interlockingly to maintain the system pressure stable; If the temperature of the second-stage spraying flue gas in the second-stage spraying is greater than the second temperature, increasing the flow rate through the cold recovery device and the flow rate through the water cooler; If the second stage spraying liquid level is lower than the third liquid level, the water supply valve from the second stage to the first stage is closed; If the second-stage spraying liquid level is lower than the fourth liquid level, the process water pump is turned on to replenish water for the flue gas cooling system.

5. The method according to claim 1, characterized in that: The flue gas cooling system further includes a medium-temperature refrigerator and a process water pump; the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level are monitored by the three-stage spray pump, and the corresponding third operation is performed, including: When the pressure of the three sections of the spray pipe is lower than the third pressure, another water pump is started in a chain manner; If the temperature of the flue gas in the three-stage spraying is greater than the third temperature, the outlet water temperature of the medium-temperature refrigerator is reduced; if the temperature of the three-stage spraying pipeline cannot be reduced to below the third temperature, another spray pump is interlocked to increase the flow rate; If the three-stage spraying liquid level is lower than the fourth liquid level, the process water pump is turned on to replenish water for the flue gas cooling system.

6. The method according to claim 1, characterized in that The flue gas cooling system further includes a low-temperature refrigerator, a calcium chloride solution replenishment pump and an MVR concentration system; the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution are monitored by the four-stage spray pump, and the corresponding fourth operation is performed, including: If the pressure of the four sections of the spray pipe is lower than the fourth pressure, another water pump is started in a chain to maintain the system pressure stable; If the temperature of the four sections of the spray pipe is greater than the fourth temperature, the outlet water temperature of the low-temperature refrigerator is reduced. If the temperature of the four sections of the spray pipe cannot be reduced to below the fourth temperature, another spray pump is interlocked to increase the flow rate; If the four-stage spraying liquid level is greater than the first liquid level, the valve of the calcium chloride solution emergency discharge pipeline is opened; when the four-stage spraying liquid level drops below the fifth liquid level, the valve of the calcium chloride solution emergency discharge pipeline is closed; If the four-stage spraying liquid level is less than the first preset value, the calcium chloride solution replenishing pump is started in a chain manner until the four-stage spraying liquid level rises to the sixth liquid level, and the replenishing pump stops; If the density of the calcium chloride solution is less than the first density, the valve is adjusted to increase the flow to the MVR concentration system to increase the evaporation amount; If the density of the calcium chloride solution is greater than the second density, the valve is adjusted to reduce the flow to the MVR concentration system and reduce the evaporation amount.

7. The method according to claim 1, characterized in that The flue gas cooling system further includes a cold recovery pump and a cold recovery tower; the method further includes: Initializing the cold recovery tower liquid in the cold recovery pump until the cold recovery tower liquid reaches a corresponding second preset value; The pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower are monitored by the cold recovery pump, and the corresponding fifth operation is performed.

8. The method according to claim 7, characterized in that The pressure and temperature of the cold recovery pipeline and the liquid level of the cold recovery tower are monitored by the cold recovery pump, and the corresponding fifth operation is performed, including: If the pressure of the cold recovery pipeline is lower than the first pressure, another water pump is started in a chain to maintain the system pressure stable; If the liquid level in the cold recovery tower is greater than the first liquid level, the valve of the sewage pipe is opened, and when the liquid in the cold recovery tower drops below the fifth liquid level, the valve is closed; If the liquid level in the cold recovery tower is lower than the first preset value, the valve of the liquid replenishment pipeline is opened, and when the liquid level rises to the sixth liquid level, the liquid replenishment is stopped.

9. A control device for a flue gas cooling system, characterized in that: Applied to a flue gas cooling system, the flue gas cooling system includes a spray cooling tower, a first-stage spray pump, a second-stage spray pump, a third-stage spray pump and a fourth-stage spray pump, and the device includes: an initialization module, for initializing the spray coolant in the first-stage spray pump, the second-stage spray pump, the third-stage spray pump, and the fourth-stage spray pump in the spray cooling tower in response to the initial startup of the flue gas cooling system, until the spray coolant reaches a corresponding preset value; A first monitoring module, used to monitor the pressure and temperature of a section of the spray pipeline and a section of the spray liquid level through the section of the spray pump, and perform a corresponding first operation; A second monitoring module is used to monitor the pressure and temperature of the second-stage spray pipeline and the second-stage spray liquid level through the second-stage spray pump, and perform a corresponding second operation; A third monitoring module is used to monitor the pressure and temperature of the three-stage spray pipeline and the three-stage spray liquid level through the three-stage spray pump, and perform a corresponding third operation; The fourth monitoring module is used to monitor the pressure and temperature of the four-stage spray pipeline, the four-stage spray liquid level, and the density of the calcium chloride solution through the four-stage spray pump, and perform the corresponding fourth operation.

10. A computer storage medium, wherein: The computer storage medium stores computer executable instructions; after the computer executable instructions are executed by the processor, the method according to any one of claims 1 to 8 can be implemented.

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