Boiler energy recovery control system

Abstract

According to the boiler energy recovery control system, after a controller receives a starting instruction, a first electric valve, a second electric valve, a third electric valve and a third electric valve are controlled to be opened, a fourth electric valve and a fifth electric valve are controlled to be closed, and a softened water circulating pump is controlled to be started, so that the system enters a circulating heating mode; low-temperature softened water in the softened water tank circularly flows through the energy saver through the softened water circulating pump and the first pipeline and then returns to the softened water tank through the second pipeline, the softened water in the softened water tank enters the deaerator to be heated, and the heated water enters the boiler through the third pipeline; high-temperature flue gas exhausted by a boiler flows through the energy saver, flows to the chimney through the flue and is exhausted to the atmosphere, and low-temperature softened water and the high-temperature flue gas flowing through the energy saver are subjected to full heat exchange, so that the temperature of the flue gas flowing to the chimney through the flue and exhausted to the atmosphere can be effectively reduced, energy is effectively recycled, and energy loss is reduced; the emission pollution is reduced; and the safety risk of equipment is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of tobacco equipment, and particularly relates to a boiler energy recovery control system. Background Art

[0002] The boiler is an important equipment in a tobacco factory. It mainly heats boiler water by burning fuel to turn the boiler water into steam for other equipment to use. The flue gas after the fuel burns in the boiler flows through the flue to the chimney and is discharged into the atmosphere. The temperature of the discharged flue gas is generally not lower than 150°C and can reach up to 204°C. The discharge of high-temperature flue gas will not only cause a large amount of heat energy waste and affect the boiler thermal efficiency, but also cause the sulfur and nitrogen in the boiler to oxidize into acidic oxides during combustion when the flue gas temperature is too high. When directly discharged into the atmosphere, it may trigger environmental pollutions such as acid rain. In addition, too high flue gas temperature may cause serious consequences such as smoke accumulation, ash accumulation or even explosion in the boiler flue, seriously affecting the safe operation and service life of the equipment. Summary of the Invention

[0003] The purpose of this application is to provide a boiler energy recovery control system. The boiler energy recovery control system provided by this application can effectively reduce the temperature of the flue gas flowing through the flue to the chimney and discharged into the atmosphere, effectively recover energy, reduce energy loss, reduce emission pollution and reduce the safety risk of the equipment. In addition, it can effectively reduce the risk that the boiler is burned out due to no water inflow and / or the flue gas temperature discharged into the atmosphere is too high due to the failure of the third electric valve and / or the first electric valve.

[0004] The technical solution provided by this application is as follows:

[0005] A boiler energy recovery control system includes: a softened water tank, a softened water circulation pump, an economizer, a deaerator, a boiler, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a fifth electric valve, a first flowmeter, a temperature sensor and a controller;

[0006] The water inlet of the softened water circulation pump is communicated with the softened water tank, the water outlet of the softened water circulation pump is communicated with the water inlet of the economizer through a first pipeline, the first electric valve is arranged on the first pipeline, the water outlet of the economizer is communicated with the softened water tank through a second pipeline, and the second electric valve is arranged on the second pipeline;

[0007] The water inlet of the deaerator is communicated with the softened water tank, the water outlet of the deaerator is communicated with the water inlet of the boiler through a third pipeline, the third electric valve and the first flowmeter are arranged on the third pipeline, and the first flowmeter is located between the third electric valve and the water inlet of the boiler. The smoke outlet of the boiler is communicated with the smoke inlet of the economizer through a smoke pipe, and the temperature sensor is arranged at the smoke outlet of the economizer;

[0008] The water outlet of the deaerator is communicated with the water inlet of the economizer through a fourth pipeline, the fourth electric valve is arranged on the fourth pipeline, the water outlet of the economizer is communicated with the water inlet of the boiler through a fifth pipeline, and the fifth electric valve is arranged on the fifth pipeline;

[0009] The controller is electrically connected to the first electric valve to the fifth electric valve, the softened water circulation pump, the first flowmeter, and the temperature sensor;

[0010] The controller is configured to, after receiving a start instruction, control the first electric valve to the third electric valve to open, control the fourth electric valve and the fifth electric valve to close, and control the softened water circulation pump to start, and obtain the flue gas temperature value collected by the temperature sensor and the first flow value collected by the first flowmeter. When the obtained flue gas temperature value is greater than or equal to a first preset temperature value, and / or, when the obtained first flow value is less than or equal to a preset flow value, control the softened water circulation pump to stop, control the first electric valve to the third electric valve to close, and control the fourth electric valve and the fifth electric valve to open.

[0011] Optionally, it further includes: a second flowmeter;

[0012] The second flowmeter is arranged on the second pipeline, and the second flowmeter is located between the second electric valve and the softened water tank;

[0013] The controller is electrically connected to the second flowmeter;

[0014] The controller is further configured to obtain the second flow value collected by the second flowmeter. When the obtained second flow value is less than or equal to the preset flow value, control the softened water circulation pump to stop, control the first electric valve to the third electric valve to close, and control the fourth electric valve and the fifth electric valve to open.

[0015] Optionally, it further includes: a boiler make-up water pump;

[0016] The water outlet of the deaerator is communicated with the water inlet of the boiler make-up water pump;

[0017] The water outlet of the boiler make-up water pump is communicated with the water inlet of the boiler through a third pipeline and with the water inlet of the economizer through a fourth pipeline;

[0018] The controller is electrically connected to the boiler make-up water pump;

[0019] The controller is further configured to control the boiler make-up water pump to start after receiving a start instruction.

[0020] Optionally, it further includes: a deaerator make-up water pump;

[0021] The inlet of the deaerator make-up water pump is communicated with the softened water tank;

[0022] The outlet of the deaerator make-up water pump is communicated with the inlet of the deaerator;

[0023] The controller is electrically connected to the deaerator make-up water pump;

[0024] The controller is further configured to control the deaerator make-up water pump to start after receiving a start instruction.

[0025] Optionally,

[0026] The controller is further configured to control the softened water circulation pump to stop and control the first electric valve, the second electric valve, the fourth electric valve and the fifth electric valve to close when the obtained flue gas temperature value is less than a second preset temperature value, wherein the second preset temperature value is less than the first preset temperature value.

[0027] Optionally,

[0028] The controller is further configured to control the first electric valve and the second electric valve to open and control the softened water circulation pump to start when the obtained flue gas temperature value is greater than or equal to a third preset temperature value and less than the first preset temperature value, wherein the third preset temperature value is greater than the second preset temperature value.

[0029] Optionally, it further includes: a sixth electric valve;

[0030] The outlet of the boiler make-up water pump is communicated with the inlet of the boiler through a sixth pipeline and the third pipeline and is communicated with the inlet of the economizer through the sixth pipeline and the fourth pipeline;

[0031] The sixth electric valve is arranged on the sixth pipeline;

[0032] The controller is electrically connected to the sixth electric valve;

[0033] The controller is further configured to control the sixth electric valve to open after receiving a start instruction.

[0034] Optionally, the economizer is a finned tube economizer.

[0035] Optionally, it further includes: a mechanical thermometer;

[0036] The mechanical thermometer is arranged at the flue gas outlet of the economizer.

[0037] Optionally, it further includes: a host computer;

[0038] The controller is further configured to send the obtained flue gas temperature value, the first flow rate value, and the second flow rate value to the host computer, and when the obtained flue gas temperature value is greater than or equal to the first preset temperature value, send a temperature alarm signal to the host computer; when the obtained first flow rate value is less than or equal to the preset flow rate value, send a first flow rate alarm signal to the host computer; and when the obtained second flow rate value is less than or equal to the preset flow rate value, send a second flow rate alarm signal to the host computer.

[0039] The host computer is configured to receive and display the flue gas temperature value, the first flow rate value, and the second flow rate value, and perform temperature alarm display when receiving the temperature alarm signal, perform first flow rate alarm display when receiving the first flow rate alarm signal, and perform second flow rate alarm display when receiving the second flow rate alarm signal.

[0040] Compared with the prior art, a boiler energy recovery control system provided by the present application, after the controller receives a start command, controls the first to third electric valves to open, controls the fourth and fifth electric valves to close, and controls the soft water circulation pump to start, so that the system enters a circulating heating mode. In this mode, the low-temperature soft water in the soft water tank circulates through the soft water circulation pump and the first pipeline, flows through the economizer, and then returns to the soft water tank through the second pipeline. In addition, the soft water in the soft water tank enters the deaerator for heating, and the heated water enters the boiler through the third pipeline. The high-temperature flue gas discharged from the boiler flows through the economizer, flows through the flue to the chimney and is discharged into the atmosphere. The low-temperature soft water and the high-temperature flue gas flowing through the economizer will conduct sufficient heat exchange, which can effectively reduce the temperature of the flue gas discharged into the atmosphere through the flue, effectively recover energy, reduce energy loss, reduce emission pollution and reduce the safety risk of equipment. Additionally, the controller obtains the flue gas temperature value collected by the temperature sensor arranged at the flue gas outlet of the economizer and the first flow value collected by the first flowmeter located between the third electric valve and the water inlet of the boiler. When the obtained flue gas temperature value is greater than or equal to the first preset temperature value, and / or the obtained first flow value is less than or equal to the preset flow value, it indicates that there is no or very little low-temperature soft water flowing from the soft water tank into the economizer through the first pipeline, and / or there is no or very little deaerated water flowing from the deaerator into the water inlet of the boiler through the third pipeline, which means that the first electric valve on the first pipeline and / or the third electric valve on the third pipeline fails. The controller controls the soft water circulation pump to stop, controls the first to third electric valves to close, and controls the fourth and fifth electric valves to open, so that the system switches from the circulating heating mode to the direct heating mode. In this mode, the soft water in the soft water tank enters the deaerator for heating, and the heated water flows through the economizer through the fourth pipeline and then flows into the boiler through the fifth pipeline. The soft water and the high-temperature flue gas flowing through the economizer conduct heat exchange to reduce the temperature of the flue gas discharged into the atmosphere, which can effectively reduce the risk that the temperature of the flue gas discharged into the atmosphere is too high due to the failure of the first electric valve and / or the third electric valve, and / or the boiler is burned out due to no water flowing in. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a structural block diagram of a boiler energy recovery control system provided in an embodiment of the present application;

[0043] Figure 2 It is a schematic diagram of the connection relationship between the controller and the first to sixth electric valves, the softened water circulation pump, the boiler make-up water pump, the deaerator make-up water pump, the first flowmeter, the second flowmeter and the temperature sensor in the embodiment of the present application;

[0044] Figure 3 It is a schematic diagram of the structure of another boiler energy recovery control system provided in the embodiment of the present application;

[0045] Reference numerals: 10 - softened water tank; 11 - softened water circulation pump; 12 - economizer; 13 - deaerator; 14 - boiler; 15 - first electric valve; 16 - second electric valve; 17 - third electric valve; 18 - fourth electric valve; 19 - fifth electric valve; 20 - first flowmeter; 21 - temperature sensor; 22 - controller; 23 - second flowmeter; 24 - boiler make-up water pump; 25 - deaerator make-up water pump; 26 - sixth electric valve; 27 - mechanical thermometer; 28 - upper computer; 29 - first manual stop valve; 30 - second manual stop valve; 31 - flue.

[0046] 101 - first pipeline; 102 - second pipeline; 103 - third pipeline; 104 - fourth pipeline; 105 - fifth pipeline; 106 - sixth pipeline; 107 - seventh pipeline; 108 - eighth pipeline. Detailed implementation manners

[0047] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0050] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise specifically defined.

[0051] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the ratio relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0052] Such as Figures 1 to 3As shown in the figure, a boiler energy recovery control system includes: a soft water tank 10, a soft water circulation pump 11, an economizer 12, a deaerator 13, a boiler 14, a first electric valve 15, a second electric valve 16, a third electric valve 17, a fourth electric valve 18, a fifth electric valve 19, a first flowmeter 20, a temperature sensor 21, and a controller 22; the water inlet of the soft water circulation pump 11 is communicated with the soft water tank 10, the water outlet of the soft water circulation pump 11 is communicated with the water inlet of the economizer 12 through a first pipeline 101, the first electric valve 15 is arranged on the first pipeline 101, the water outlet of the economizer 12 is communicated with the soft water tank 10 through a second pipeline 102, and the second electric valve 16 is arranged on the second pipeline 102; the water inlet of the deaerator 13 is communicated with the soft water tank 10, the water outlet of the deaerator 13 is communicated with the water inlet of the boiler 14 through a third pipeline 103, the third electric valve 17 and the first flowmeter 20 are arranged on the third pipeline 103, and the first flowmeter 20 is located between the third electric valve 17 and the water inlet of the boiler 14. The smoke outlet of the boiler 14 is communicated with the smoke inlet of the economizer 12 through a smoke pipe, and the temperature sensor 21 is arranged at the smoke outlet of the economizer 12; the water outlet of the deaerator 13 is communicated with the water inlet of the economizer 12 through a fourth pipeline 104, the fourth electric valve 18 is arranged on the fourth pipeline 104, the water outlet of the economizer 12 is communicated with the water inlet of the boiler 14 through a fifth pipeline 105, and the fifth electric valve 19 is arranged on the fifth pipeline 105; the controller 22 is electrically connected to the first electric valve 15 to the fifth electric valve 19, the soft water circulation pump 11, the first flowmeter 20, and the temperature sensor 21; the controller 22 is configured to, after receiving a start command, control the first electric valve 15 to the third electric valve 17 to open, control the fourth electric valve 18 and the fifth electric valve 19 to close, and control the soft water circulation pump 11 to start, and obtain the flue gas temperature value collected by the temperature sensor 21 and the first flow value collected by the first flowmeter 20. When the obtained flue gas temperature value is greater than or equal to a first preset temperature value, and / or, the obtained first flow value is less than or equal to a preset flow value, control the soft water circulation pump 11 to stop, control the first electric valve 15 to the third electric valve 17 to close, and control the fourth electric valve 18 and the fifth electric valve 19 to open.

[0053] In this embodiment, the controller 22 can be a PLC (Programmable Logic Controller), and the model of the PLC can be S7-200start; the preset flow value is a pre-set flow value, and the first preset temperature value is a pre-set temperature value. The preset flow value can be set to 0 or a very small flow value, and the first preset temperature value can be set to 150°C or 204°C, which can be specifically set according to the actual situation. After receiving the start instruction, the controller 22 controls the first electric valve 15 to the third electric valve 17 to open, controls the fourth electric valve 18 and the fifth electric valve 19 to close, and controls the soft water circulation pump 11 to start, so that the system enters the circulating heating mode. As a result, the low-temperature (such as 19°C) soft water in the soft water tank 10 circulates through the soft water circulation pump 11 and the first pipeline 101, flows through the economizer 12, and then returns to the soft water tank 10 through the second pipeline 102. In addition, the soft water in the soft water tank 10 enters the deaerator 13 for heating, and the heated water (such as heated to 104°C) enters the boiler 14 through the third pipeline 103. The high-temperature flue gas discharged from the boiler 14 flows through the economizer 12, flows through the flue 31 to the chimney and is discharged into the atmosphere. The low-temperature (such as 19°C) soft water and the high-temperature (such as 204°C) flue gas flowing through the economizer 12 will conduct sufficient heat exchange. After the heat exchange, the temperature of the flue gas discharged from the smoke outlet of the economizer 12 can generally be as low as 75°C, which can effectively reduce the temperature of the flue gas flowing through the flue 31 to the chimney and discharged into the atmosphere, effectively recover energy, reduce energy loss, reduce emission pollution, and reduce the safety risk of the equipment;The controller 22 obtains in real time the flue gas temperature value collected by the temperature sensor 21 arranged at the smoke outlet of the energy saver 12 and the first flow value collected by the first flowmeter 20 located between the third electric valve 17 and the water inlet of the boiler 14. When the obtained flue gas temperature value is greater than or equal to the first preset temperature value, and / or the obtained first flow value is less than or equal to the preset flow value, it indicates that there is no or very little low-temperature softened water flowing from the soft water tank 10 into the energy saver 12 through the first pipeline 101, and / or there is no or very little deaerated water flowing from the deaerator 13 into the water inlet of the boiler 14 through the third pipeline 103, indicating that the first electric valve 15 on the first pipeline 101 and / or the third electric valve 17 on the third pipeline 103 fails. The controller 22 controls the soft water circulation pump 11 to stop, controls the first electric valve 15 to the third electric valve 17 to close, and controls the fourth electric valve 18 and the fifth electric valve 19 to open, so that the system switches from the circulating heating mode to the direct heating mode, enabling the soft water in the soft water tank 10 to enter the deaerator 13 for heating. After heating (such as heating to 104°C), the water flows through the energy saver 12 through the fourth pipeline 104 and then flows into the boiler 14 through the fifth pipeline 105. The softened water flowing through the energy saver 12 (such as 104°C) exchanges heat with the high-temperature (such as 204°C) flue gas to reduce the temperature of the flue gas discharged into the atmosphere, effectively reducing the risk of the temperature of the flue gas discharged into the atmosphere being too high and / or the boiler 14 being burned out due to no water flowing in caused by the failure of the first electric valve 15 and / or the third electric valve 17.;

[0054] Compared with the prior art, a boiler energy recovery control system provided by the present application, after the controller 22 receives a start instruction, controls the first electric valve 15 to the third electric valve 17 to open, controls the fourth electric valve 18 and the fifth electric valve 19 to close, and controls the soft water circulation pump 11 to start, so that the system enters a circulating heating mode, so that the low-temperature soft water in the soft water tank 10 circulates through the soft water circulation pump 11 and the first pipeline 101 and flows through the economizer 12, and then returns to the soft water tank 10 through the second pipeline 102, and the soft water in the soft water tank 10 enters the deaerator 13 for heating, and the heated water enters the boiler 14 through the third pipeline 103. The high-temperature flue gas discharged from the boiler 14 flows through the economizer 12 and flows to the chimney through the flue 31 and is discharged into the atmosphere. The low-temperature soft water and the high-temperature flue gas flowing through the economizer 12 will conduct sufficient heat exchange, which can effectively reduce the temperature of the flue gas flowing through the flue 31 and discharged into the atmosphere, effectively recover energy, reduce energy loss, and reduce emission pollution and reduce the safety risk of the equipment; in addition, the controller 22 obtains the flue gas temperature value collected by the temperature sensor 21 arranged at the smoke outlet of the economizer 12 and the first flow value collected by the first flowmeter 20 located between the third electric valve 17 and the water inlet of the boiler 14. When the obtained flue gas temperature value is greater than or equal to the first preset temperature value, and / or, the obtained first flow value is less than or equal to the preset flow value, it indicates that there is no or very little low-temperature soft water flowing from the soft water tank 10 into the economizer 12 through the first pipeline 101, and / or, there is no or very little deaerated water flowing from the deaerator 13 into the water inlet of the boiler 14 through the third pipeline 103, indicating that the first electric valve 15 on the first pipeline 101 and / or the third electric valve 17 on the third pipeline 103 fails. The controller 22 controls the soft water circulation pump 11 to stop, controls the first electric valve 15 to the third electric valve 17 to close, and controls the fourth electric valve 18 and the fifth electric valve 19 to open, so that the system switches from the circulating heating mode to the direct heating mode, so that the soft water in the soft water tank 10 enters the deaerator 13 for heating, and the heated water flows through the economizer 12 through the fourth pipeline 104 and then flows into the boiler 14 through the fifth pipeline 105. The soft water flowing through the economizer 12 exchanges heat with the high-temperature flue gas to reduce the temperature of the flue gas discharged into the atmosphere, which can effectively reduce the risk that the temperature of the flue gas discharged into the atmosphere is too high due to the failure of the first electric valve 15 and / or the third electric valve 17, and / or the boiler 14 is burned out due to no water flowing in.

[0055] Such as Figure 1 And Figure 2As shown in the figure, as an implementation manner, in the embodiments of the present application, it further includes: a second flowmeter 23; the second flowmeter 23 is arranged on the second pipeline 102, and the second flowmeter 23 is located between the second electric valve 16 and the softening water tank 10; the controller 22 is electrically connected to the second flowmeter 23; the controller 22 is further configured to obtain a second flow value collected by the second flowmeter 23, and when the obtained second flow value is less than or equal to a preset flow value, control the softening water circulation pump 11 to stop, control the first electric valve 15 to the third electric valve 17 to close, and control the fourth electric valve 18 and the fifth electric valve 19 to open.

[0056] In this embodiment, the controller 22 obtains in real time the second flow value collected by the second flowmeter 23 on the second pipeline 102 between the second electric valve 16 and the softening water tank 10. When the obtained second flow value is less than or equal to the preset flow value, it indicates that there is no or very little low-temperature softening water flowing from the second electric valve 16 through the second pipeline 102 into the softening water tank 10 at this time, indicating that the second electric valve 16 on the second pipeline 102 fails. The controller 22 controls the softening water circulation pump 11 to stop, controls the first electric valve 15 to the third electric valve 17 to close, and controls the fourth electric valve 18 and the fifth electric valve 19 to open, so that the system switches from the circulating heating mode to the direct heating mode, so that the softening water in the softening water tank 10 enters the deaerator 13 for heating. After the heated water flows through the economizer 12 through the fourth pipeline 104, it flows into the boiler 14 through the fifth pipeline 105. The softening water flowing through the economizer 12 exchanges heat with the high-temperature flue gas to reduce the temperature of the flue gas discharged into the atmosphere, and can effectively reduce the risk of the temperature of the flue gas discharged into the atmosphere being too high due to the failure of the second electric valve 16.

[0057] As Figures 1 to 3 shown in the figure, as an implementation manner, in the embodiments of the present application, it further includes: a boiler make-up water pump 24; the water outlet of the deaerator 13 is communicated with the water inlet of the boiler make-up water pump 24; the water outlet of the boiler make-up water pump 24 is communicated with the water inlet of the boiler 14 through the third pipeline 103 and with the water inlet of the economizer 12 through the fourth pipeline 104; the controller 22 is electrically connected to the boiler make-up water pump 24; the controller 22 is further configured to control the boiler make-up water pump 24 to start after receiving a start command.

[0058] In this embodiment, after receiving the start command, the controller 22 controls the first electric valve 15 to the third electric valve 17 to open, controls the fourth electric valve 18 and the fifth electric valve 19 to close, and controls the softening water circulation pump 11 and the boiler make-up water pump 24 to start, so that the system enters the circulating heating mode.

[0059] As Figures 1 to 3As shown, as an implementation manner, in the embodiment of the present application, it further includes: a deaerator make-up water pump 25; the water inlet of the deaerator make-up water pump 25 is communicated with the soft water tank 10; the water outlet of the deaerator make-up water pump 25 is communicated with the water inlet of the deaerator 13; the controller 22 is electrically connected to the deaerator make-up water pump 25; the controller 22 is further configured to control the deaerator make-up water pump 25 to start after receiving a start instruction.

[0060] In this embodiment, after receiving the start instruction, the controller 22 controls the first electric valve 15 to the third electric valve 17 to open, controls the fourth electric valve 18 and the fifth electric valve 19 to close, and controls the soft water circulation pump 11, the deaerator make-up water pump 25 and the boiler make-up water pump 24 to start, so that the system enters the circulating heating mode.

[0061] As an implementation manner, in the embodiment of the present application, the controller 22 is further configured to control the soft water circulation pump 11 to stop and control the first electric valve 15, the second electric valve 16, the fourth electric valve 18 and the fifth electric valve 19 to close when the obtained flue gas temperature value is less than the second preset temperature value, where the second preset temperature value is less than the first preset temperature value.

[0062] In this embodiment, the second preset temperature value is a preset temperature value, and the second preset temperature value can be set to 50 °C. When the controller 22 obtains that the flue gas temperature value collected by the temperature sensor 21 arranged at the flue gas outlet of the economizer 12 is less than the second preset temperature value, it indicates that the boiler 14 does not discharge flue gas at this time, and the boiler 14 is in the standby state or the stop operation state. Generally, the boiler 14 is in the standby state or the stop operation state at night. The controller 22 controls the soft water circulation pump 11 to stop and controls the first electric valve 15, the second electric valve 16, the fourth electric valve 18 and the fifth electric valve 19 to close, so that the entire system is in the standby mode, which can effectively reduce the energy consumption of the system.

[0063] As an implementation manner, in the embodiment of the present application, the controller 22 is further configured to control the first electric valve 15 and the second electric valve 16 to open and control the soft water circulation pump 11 to start when the obtained flue gas temperature value is greater than or equal to the third preset temperature value and less than the first preset temperature value, where the third preset temperature value is greater than the second preset temperature value.

[0064] In this embodiment, the third preset temperature value is a preset temperature value, which can be set to 100 °C. When the controller 22 obtains that the flue gas temperature value collected by the temperature sensor 21 arranged at the smoke outlet of the economizer 12 is greater than or equal to the third preset temperature value and less than the first preset temperature value, it indicates that the boiler 14 has restarted and discharged flue gas at this time. The controller 22 controls the first electric valve 15 and the second electric valve 16 to open, and controls the soft water circulation pump 11 to start, so that the first electric valve 15 to the third electric valve 17 are in the open state, the fourth electric valve 18 and the fifth electric valve 19 are in the closed state, and the soft water circulation pump 11, the deaerator makeup water pump 25 and the boiler makeup water pump 24 are in the starting and running state, so that the system switches from the standby mode to the circulating heating mode.

[0065] As Figure 2 and Figure 3 shown, as an implementation manner, in the embodiment of the present application, it further includes: a sixth electric valve 26; the water outlet of the boiler makeup water pump 24 is communicated with the water inlet of the boiler 14 through the sixth pipeline 106 and the third pipeline 103, and is communicated with the water inlet of the economizer 12 through the sixth pipeline 106 and the fourth pipeline 104; the sixth electric valve 26 is arranged on the sixth pipeline 106; the controller 22 is electrically connected to the sixth electric valve 26; the controller 22 is further configured to control the sixth electric valve 26 to open after receiving a start command.

[0066] In this embodiment, after receiving the start command, the controller 22 controls the first electric valve 15 to the third electric valve 17 and the sixth electric valve 26 to open, controls the fourth electric valve 18 and the fifth electric valve 19 to close, and controls the soft water circulation pump 11, the deaerator makeup water pump 25 and the boiler makeup water pump 24 to start, so that the system enters the circulating heating mode.

[0067] As an implementation manner, in the embodiment of the present application, the economizer 12 is a finned tube economizer 12.

[0068] In this embodiment, the heat exchange area of the finned tube economizer 12 is relatively large. By adopting the finned tube economizer 12, the heat exchange efficiency between the low-temperature soft water flowing through the economizer 12 and the high-temperature flue gas can be effectively improved.

[0069] As Figure 3 shown, as an implementation manner, in the embodiment of the present application, it further includes: a mechanical thermometer 27; the mechanical thermometer 27 is arranged at the smoke outlet of the economizer 12.

[0070] As Figure 3As shown, as an implementation manner, in the embodiments of the present application, it further includes: a host computer 28; a controller 22, which is further configured to send the obtained flue gas temperature value, the first flow rate value, and the second flow rate value to the host computer 28, and when the obtained flue gas temperature value is greater than or equal to the first preset temperature value, send a temperature alarm signal to the host computer 28, and when the obtained first flow rate value is less than or equal to the preset flow rate value, send a first flow rate alarm signal to the host computer 28, and when the obtained second flow rate value is less than or equal to the preset flow rate value, send a second flow rate alarm signal to the host computer 28; the host computer 28 is configured to receive and display the flue gas temperature value, the first flow rate value, and the second flow rate value, and perform temperature alarm display when receiving the temperature alarm signal, perform first flow rate alarm display when receiving the first flow rate alarm signal, and perform second flow rate alarm display when receiving the second flow rate alarm signal.

[0071] In this embodiment, the host computer 28 is further configured to send a start instruction to the controller 22; when the staff believes that the flue gas temperature value displayed on the host computer 28 may be inaccurate, or when the host computer 28 performs temperature alarm display, the temperature value detected by the mechanical thermometer 27 provided at the smoke outlet of the economizer 12 can be used for comparison and verification.

[0072] As Figure 3 As shown, in the embodiments of the present application, the boiler energy recovery control system further includes: a first manual shut-off valve 29 and a second manual shut-off valve 30. The outlet of the softened water circulation pump 11 is connected to the inlet of the economizer 12 through a first pipeline 101 and a seventh pipeline 107. The outlet of the deaerator 13 is connected to the inlet of the economizer 12 through a fourth pipeline 104 and a seventh pipeline 107. The outlet of the economizer 12 is connected to the softened water tank 10 through an eighth pipeline 108 and a second pipeline 102. The outlet of the economizer 12 is connected to the inlet of the boiler 14 through an eighth pipeline 108 and a fifth pipeline 105. The first manual shut-off valve 29 is provided on the seventh pipeline 107, and the second manual shut-off valve 30 is provided on the eighth pipeline 108. By setting the first manual shut-off valve 29, when the controller 22 cannot control the first electric valve 15 on the first pipeline 101 to close or the fourth electric valve 18 on the fourth pipeline 104 to close, the first manual shut-off valve 29 can be manually operated to disconnect the passage between the outlet of the softened water circulation pump 11 and the inlet of the economizer 12, and the passage between the outlet of the deaerator 13 and the inlet of the economizer 12. By setting the second manual shut-off valve 30, when the controller 22 cannot control the second electric valve 16 on the second pipeline 102 to close or the fifth electric valve 19 on the fifth pipeline 105 to close, the second manual shut-off valve 30 can be manually operated to disconnect the passage between the outlet of the economizer 12 and the softened water tank 10, and the passage between the outlet of the economizer 12 and the inlet of the boiler 14.

[0073] It should be understood that in this application, if terms such as "system", "device", "unit" and / or "module" are used, they are only a way to distinguish different components, elements, parts, portions or assemblies at different levels. However, if other terms can achieve the same purpose, they can be replaced by other expressions.

[0074] In this specification, the embodiments are described in a progressive manner, and each embodiment focuses on the differences from

[0075] other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0076] The above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler energy recovery control system, characterized in that: include: Softened water tank, softened water circulation pump, economizer, deaerator, boiler, first electric valve, second electric valve, third electric valve, fourth electric valve, fifth electric valve, first flow meter, temperature sensor and controller; The water inlet of the softened water circulation pump is communicated with the softened water tank, the water outlet of the softened water circulation pump is communicated with the water inlet of the economizer through a first pipeline, the first electric valve is arranged on the first pipeline, the water outlet of the economizer is communicated with the softened water tank through a second pipeline, and the second electric valve is arranged on the second pipeline; The water inlet of the deaerator is communicated with the softening water tank, the water outlet of the deaerator is communicated with the water inlet of the boiler through a third pipeline, the third electric valve and the first flow meter are arranged on the third pipeline, and the first flow meter is located between the third electric valve and the water inlet of the boiler, the smoke outlet of the boiler is communicated with the smoke inlet of the economizer through a smoke pipe, and the temperature sensor is arranged at the smoke outlet of the economizer; The water outlet of the deaerator is connected to the water inlet of the economizer through a fourth pipeline, the fourth electric valve is arranged on the fourth pipeline, the water outlet of the economizer is connected to the water inlet of the boiler through a fifth pipeline, and the fifth electric valve is arranged on the fifth pipeline; The controller is electrically connected to the first electric valve to the fifth electric valve, the softened water circulation pump, the first flow meter, and the temperature sensor; The controller is used to, after receiving a start instruction, control the first electric valve to the third electric valve to open, control the fourth electric valve and the fifth electric valve to close, and control the softened water circulation pump to start, and obtain the flue gas temperature value collected by the temperature sensor and the first flow value collected by the first flow meter, and when the obtained flue gas temperature value is greater than or equal to the first preset temperature value, and / or the obtained first flow value is less than or equal to the preset flow value, control the softened water circulation pump to stop, control the first electric valve to the third electric valve to close, and control the fourth electric valve and the fifth electric valve to open.

2. The boiler energy recovery control system according to claim 1, characterized in that: Also includes: A second flow meter; The second flow meter is arranged on the second pipeline, and the second flow meter is located between the second electric valve and the softened water tank; The controller is electrically connected to the second flow meter; The controller is also used to obtain a second flow value collected by the second flow meter. When the obtained second flow value is less than or equal to the preset flow value, the controller controls the softened water circulation pump to stop, controls the first electric valve to the third electric valve to close, and controls the fourth electric valve and the fifth electric valve to open.

3. The boiler energy recovery control system according to claim 1 or 2, characterized in that: Also includes: Boiler feed water pump; The water outlet of the deaerator is communicated with the water inlet of the boiler feed water pump; The water outlet of the boiler water supply pump is connected to the water inlet of the boiler through a third pipeline, and is connected to the water inlet of the economizer through a fourth pipeline; The controller is electrically connected to the boiler feed water pump; The controller is also used to control the boiler water supply pump to start after receiving a start instruction.

4. The boiler energy recovery control system according to claim 3, characterized in that: Also includes: Deaerator make-up pump; The water inlet of the deaerator water supply pump is connected to the softened water tank; The water outlet of the deaerator water supply pump is connected to the water inlet of the deaerator; The controller is electrically connected to the deaerator water supply pump; The controller is also used to control the deaerator water supply pump to start after receiving a start instruction.

5. The boiler energy recovery control system according to claim 4, characterized in that: The controller is also used to control the softened water circulation pump to stop and control the first electric valve, the second electric valve, the fourth electric valve and the fifth electric valve to close when the acquired flue gas temperature value is less than a second preset temperature value, wherein the second preset temperature value is less than the first preset temperature value.

6. The boiler energy recovery control system according to claim 5, characterized in that: The controller is also used to control the first electric valve and the second electric valve to open, and control the softened water circulation pump to start when the acquired flue gas temperature value is greater than or equal to a third preset temperature value and less than the first preset temperature value, wherein the third preset temperature value is greater than the second preset temperature value.

7. The boiler energy recovery control system according to claim 4, characterized in that: Also includes: The sixth electric valve; The water outlet of the boiler water supply pump is connected to the water inlet of the boiler through the sixth pipeline and the third pipeline, and is connected to the water inlet of the economizer through the sixth pipeline and the fourth pipeline; The sixth electric valve is arranged on the sixth pipeline; The controller is electrically connected to the sixth electric valve; The controller is further configured to control the sixth electric valve to open after receiving a start instruction.

8. The boiler energy recovery control system according to claim 1, characterized in that: The energy saver is a fin-tube type energy saver.

9. The boiler energy recovery control system according to claim 1, characterized in that: Also includes: Mechanical temperature gauge; The mechanical temperature gauge is arranged at the smoke outlet of the economizer.

10. The boiler energy recovery control system according to claim 2, characterized in that: Also includes: Host computer; The controller is further used to send the obtained flue gas temperature value, the first flow value and the second flow value to the host computer, and send a temperature alarm signal to the host computer when the obtained flue gas temperature value is greater than or equal to the first preset temperature value, send a first flow alarm signal to the host computer when the obtained first flow value is less than or equal to the preset flow value, and send a second flow alarm signal to the host computer when the obtained second flow value is less than or equal to the preset flow value; The host computer is used to receive and display the flue gas temperature value, the first flow value and the second flow value, and to display a temperature alarm when the temperature alarm signal is received, to display a first flow alarm when the first flow alarm signal is received, and to display a second flow alarm when the second flow alarm signal is received.

Images