Method and system for controlling deoxidization of deaerator

Abstract

The invention discloses a system for controlling a deaerator to remove oxygen, which comprises an upper computer (1), a new water adding pipeline (2), a water return pipeline (3), a mixer (4), a deaerator (5) and an alarm module (6), the input end of the mixer (4) is connected with the new water inlet pipeline (2) and the water return pipeline (3); the water mixed by the mixer (4) flows into the deaerator (5) for deaeration, and then flows into a water system (7) for use by the water system (7); water passing through the water consumption system (7) enters the mixer (4) through the water return pipeline (4); the upper computer (1) is respectively in data communication connection with the mixer (4), the deaerator (5) and the alarm module (6), so that the mixer (4), the deaerator (5) and the alarm module (6) are monitored and controlled through the upper computer (1). According to the application, the hot waste gas of the boiler is introduced into the heat exchange system to preheat the mixed water, so that the water temperature is increased, the subsequent heating of the deaerator is facilitated, fuel is saved, and the technical effects of saving cost, saving energy and reducing emission are achieved.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular, to a method and system for controlling deaeration of a deaerator. Background Art

[0002] In fields that utilize hot water, such as industrial fields like boilers, power plants, and printing and dyeing factories, hot water is required. However, when hot water is used in pipelines or heated containers, since water usually dissolves oxygen, this oxygen-containing water has strong oxidizing properties and is prone to oxidation reactions with the surface of the boiler container in the boiler over a long period, resulting in corrosion of the boiler equipment. Therefore, people hope to provide water with very low oxygen content for the above-mentioned hot water equipment, which can reduce the oxidation and corrosion effect to protect the equipment. However, although ordinary pure water meets the requirements, using it in large quantities will result in high costs. Therefore, it is hoped to provide a method for quickly producing water with low oxygen content and low cost for use. Thus, people use a deaerator to deaerate conventional water. Its principle is usually to utilize the fact that the solubility of oxygen in water decreases with increasing temperature, and thus heating is used for deaeration. For example, patent application CN116464959A discloses a method and system for controlling deaeration of a deaerator. The method includes: pretreating the stored water in the drain tank and then introducing it into the deaerator; opening the deaeration tower to introduce steam into the deaerator to deaerate the water in the deaerator; adjusting the state of the heating device in the deaerator according to the temperature; adjusting the power of the heating device according to the comparison result between the real-time temperature and the preset temperature; adjusting the opening degree of the exhaust valve according to the comparison result between the oxygen content and the preset threshold; and correcting the opening degree of the exhaust valve according to the real-time flow rate. Patent application CN 106996556A discloses an internal built-in headless high-pressure deaerator of the present invention, including a cylinder body. An internal cylinder body, a water spraying inner cylinder, a reboiler, a steam-water mixing outer cylinder, a heating steam pipe, a re-boiling heating pipe, and a deaerated water outlet are installed inside the cylinder body; a water supply pipe, a return pipe, and an exhaust pipe are arranged on the cylinder body surrounded by the internal cylinder body, and a spraying device and a packing layer are further arranged inside the internal cylinder body from top to bottom;

[0003] Patent application CN116255612A discloses a double - tower energy - saving deaerator and deaeration method, including a deaeration water tank, a first deaeration tower, a second deaeration tower, a flash tank, a water - water heat exchanger, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve, a sixth regulating valve, a check valve, a seventh regulating valve, a first temperature transmitter, a first level gauge, and a first pressure transmitter; The present invention uses double - tower deaeration. The first deaeration tower is used to remove oxygen and non - condensable gases in water, and the second deaeration tower is used to pre - heat deionized water and separate oxygen and other non - condensable gases, creating conditions to recover low - quality waste steam that cannot be utilized in the existing exhaust. At the same time, for the control of the deaerator, there are also corresponding control technologies to achieve better deaeration performance. For example, patent application CN103970013A discloses a method for implementing the control of a deaerator based on genetic algorithms and fuzzy control, including: analyzing the structure and operating characteristics of the boiler deaerator, establishing a mathematical model of the boiler deaerator control system; designing the structure of the fuzzy PID control system and determining the control parameters of the fuzzy PID control system; optimizing the control parameters using genetic algorithms; establishing an object model of the boiler deaerator control system in an industrial control configuration software through the mathematical model of the boiler deaerator control system; developing fuzzy PID control elements and genetic algorithm elements in the configuration software; using the fuzzy PID control elements, genetic algorithm elements, conventional control elements, and the object model to implement the control strategy of the boiler deaerator, completing simulation calculations and analyzing the simulation results. The genetic - optimized fuzzy PID control algorithm of the present invention is integrated into the configuration software in the form of components, which greatly improves the real - time performance of the online operation of advanced control strategies.

[0004] Therefore, at present, people have developed many technologies in deaerators and deaeration control to improve deaeration quality and precise control. However, in terms of the composition of the deaeration system and cost - optimization control, there are still the following problems to be solved:

[0005] 1. In the prior art, in the field of using hot water, there are usually boilers for boiling water, which usually use coal combustion to heat water to produce hot water. However, the waste gas resources that generate heat in the boiler are usually not utilized but directly discharged into the atmosphere. This not only wastes a large amount of heat energy, but also requires an additional heat source for the heat energy required by the deaerator, resulting in an increase in cost on the one hand due to the need for an additional heat source, and on the other hand, wasting heat. For data processing, there is no effective and fast processing method to quickly train a data training model.

[0006] 2. In the prior art, deaerators usually only use heating to remove oxygen in water, and the oxygen is discharged together with steam. However, in the heated water, the pressure will increase, which is not conducive to the separation of oxygen and water, and thus oxygen cannot be efficiently discharged.

[0007] 3. In the prior art, when deaeration operation is carried out in a deaerator, the combined linkage relationship of each subsystem in the deaerator is not considered, resulting in an unstable deaeration process. Especially when the water temperature is heated to different temperatures, the required decompression pressure is different, and when the water supply of the water pump is different, the required heating temperature is also different, but this is not considered in the prior art.

[0008] Facing the above technical problems, it has become a problem that people hope to solve to provide a low-cost and high-quality deaerator control system and control method. Therefore, this application proposes a method and system for controlling the deaeration of a deaerator to solve the above technical problems. Summary of the Invention

[0009] The purpose of the present invention is to provide a method and system for controlling the deaeration of a deaerator.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is: a system for controlling the deaeration of a deaerator, including a host computer, a fresh water addition pipeline, a return water pipeline, a mixer, a deaerator and an alarm module. The input end of the mixer is connected to the fresh water inlet pipeline and the return water pipeline. The water mixed by the mixer flows into the deaerator for deaeration and then flows into the water use system for the water use system to use; the water passing through the water use system enters the mixer through the return water pipeline; the host computer is respectively data communication connected to the mixer, the deaerator and the alarm module, so as to realize monitoring and controlling the mixer, the deaerator and the alarm module through the host computer;

[0011] It is characterized in that: the deaerator includes a heat exchange system, a decompression system, a pressure detection module, and an oxygen content detection module. The host computer is respectively data communication connected to the heat exchange system, the decompression system, the pressure detection module, and the oxygen content detection module to realize monitoring and control of them; the heat exchange system and the decompression system in the deaerator are connected in sequence. The oxygen content detection module is used to detect the oxygen content of the water after being processed by the decompression system; thus, the newly entered water and the return water flow through the heat exchange system and the decompression system in sequence after being mixed; wherein, the heat exchange system is communicated with the heat-carrying waste gas of the boiler.

[0012] During the deoxygenation operation, the output end of the mixer is connected to a heat exchange system so that the mixed water flows through this heat exchange system. At the same time, the hot waste gas generated by the boiler combustion flows through the heat exchange system, so as to realize the heat exchange between the hot waste gas and the mixed water in order to heat the water; the heated water flows through a pressure reduction system to reduce the pressure so that oxygen and the water are separated, and the oxygen is discharged through an exhaust system. At the same time, the treated water enters the water use system for the water use system after discharging oxygen, and the water after passing through the water use system returns to the mixer through the return pipeline when it needs to be recycled.

[0013] When the oxygen content in the water obtained by the oxygen content detection module continuously exceeds the threshold for a certain period of time, an alarm is given through the alarm module to remind the personnel to carry out maintenance in time.

[0014] Preferably, a heating system is also provided between the pipelines of the heat exchange system and the pressure reduction system. The heating system is connected to the upper computer for data communication, so that the upper computer controls the heating system to heat the water flowing through the heat exchange system through the heating system to heat it to a suitable temperature.

[0015] Preferably, the pressure reduction system further includes a water temperature detection module and an exhaust pump. The water temperature detection module obtains the water temperature T of the heated water, and the exhaust pump is connected to the treatment tank to pump air from the treatment tank to provide negative pressure, and its power is Pt, where Pt = k * 1 / T, where k is a constant.

[0016] Preferably, after the water flows through the pressure reduction system, it flows through the three-way valve again. When the oxygen content detection module detects that the water meets the water use requirements of the water use system, the three-way valve operates to let the water flow into the water use system for water supply. If the water does not meet the water use requirements of the water use system, the three-way valve is controlled to return the water to the heat exchange system for deoxygenation again.

[0017] Preferably, the fresh water addition pipeline is also connected with a flow pump, and the flow pump is connected to the upper computer to realize the control of the water delivery power Pf of the flow pump through the upper computer; where the water delivery power Pf = k 2 *Pt / T, where k 2 is a constant.

[0018] Preferably, the oxygen content detection module retrieves the oxygen content v in the water and sends it to the upper computer. The upper computer adjusts the heating power Ph of the heating system based on the detected oxygen content v and sends it to the heating system to adjust the heating power Ph, where Ph = k 3 *1 / v, where k 3 is a constant.

[0019] Preferably, when the host computer controls the flow pump, the pressure reducing system and the heating system, it first monitors whether the amount of water Q generated by the deaerator meets the demand. When the amount of water Q is lower than the demand, the water delivery power Pf of the flow pump is increased to meet the water delivery volume, and at the same time, the heating system and the pressure reducing system are controlled to operate so as to generate water with a qualified oxygen content.

[0020] On the other hand, the present application also provides a method for controlling the deaeration of a deaerator, including controlling the deaerator deaeration system, which includes the following steps:

[0021] Step S1, the host computer collects the water delivery power Pf, the power Pt of the exhaust pump, the pressure P detected by the pressure detection module, the temperature T of the water flowing through the pressure reducing system, and the oxygen content v in the water obtained by the oxygen content detection module;

[0022] Step S2, when the amount of water Q is lower than the demand, the water delivery power Pf of the flow pump is increased to meet the water delivery volume, and at the same time, the heating system and the pressure reducing system are controlled to operate so as to generate water with a qualified oxygen content; the flow pump is connected to the host computer so as to realize controlling the water delivery power Pf of the flow pump through the host computer; wherein the water delivery power Pf = k 2 *Pt / T, where k 2 is a constant;

[0023] Step S3, the oxygen content detection module retrieves the oxygen content v in the water and sends it to the host computer, and the host computer adjusts the heating power Ph of the heating system based on the detected oxygen content v and sends it to the heating system so as to adjust the heating power Ph, where Ph = k 3 *1 / v, where k 3 is a constant;

[0024] Step S4, if the amount of water that meets the requirements after the deaerator treatment is lower than the demand of the water use system, the reduction of the water delivery power Pf is stopped, the water temperature detection module obtains the water temperature T of the heated water, the exhaust pump is connected to the treatment tank, and evacuates the treatment tank to provide a negative pressure, and its power is Pt, where Pt = k*1 / T, where k is a constant;

[0025] Step S5, when the amount of water Q generated by the deaerator meets the demand but the oxygen content v does not meet the requirements, the host computer only increases the power Ph of the heating system and / or the power Pt of the pressure reducing system. When the amount of water Q generated by the deaerator exceeds the demand, the water delivery power Pf is reduced;

[0026] Step S6, when the oxygen content detection module detects that the water meets the water use requirements of the water use system, the three-way valve operates to supply the water into the user system. If the water does not meet the water use requirements of the water use system, the three-way valve is controlled to return the water to the heat exchange system for deaeration again.

[0027] Preferably, a solar water heater is arranged between the mixer and the heat exchange system. The water passing through the mixer is preheated by the solar water heater.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. In the present application, by introducing the hot exhaust gas of the boiler into the heat exchange system to preheat the mixed water, the water temperature is increased, so as to save fuel for the subsequent heating of the deaerator, achieving the technical effects of cost saving and energy conservation and emission reduction; at the same time, reducing the exhaust gas temperature can also better protect the environment;

[0030] 2. In the present application, in order to further improve the deaeration efficiency, a decompression system is also provided in the deaerator of the present application. The decompression system evacuates and decompresses the heated water, so that the oxygen in it is separated more quickly;

[0031] 3. In the present application, a host computer is set, so that the host computer simultaneously obtains comprehensive data such as the pump power data, the temperature of water heating, and the decompression data, etc., and through fine modulation of each parameter, each subsystem works stably, generating stable deaerated water. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the deaerator deaeration system and its control method;

[0033] Figure 2 It is the first embodiment of the deaerator deaeration system and its control method;

[0034] Figure 3 It is the first embodiment of the deaerator deaeration system and its control method.

[0035] Explanation of the reference numerals in the drawings is as follows: 1, host computer; 2, new water addition pipeline; 3, return water pipeline; 4, mixer; 5, deaerator; 6, alarm module; 7, water use system; 8, heat exchange system; 9, decompression system; 10, pressure detection module; 11, oxygen content detection module; 12, boiler; 13, heating system; 14, three-way valve; 15, flow pump. Detailed Embodiments

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments. Specific Embodiment 1:

[0038] As shown Figure 1 in the figure, a system for controlling deaeration of a deaerator includes a host computer 1, a make-up water adding pipeline 2, a return water pipeline 3, a mixer 4, a deaerator 5, and an alarm module 6. The input end of the mixer 4 is connected to the make-up water inlet pipeline 2 and the return water pipeline 3. The water after being mixed by the mixer 4 flows into the deaerator 5 for deaeration and then into a water using system 7 for use by the water using system 7. The water passing through the water using system 7 enters the mixer 4 through the return water pipeline 4. The host computer 1 is respectively data communication-connected to the mixer 4, the deaerator 5, and the alarm module 6, so as to realize monitoring and controlling the mixer 4, the deaerator 5, and the alarm module 6 through the host computer 1;

[0039] The deaerator 5 includes a heat exchange system 8, a pressure reducing system 9, a pressure detection module 10, and an oxygen content detection module 11. The host computer 1 is respectively data communication-connected to the heat exchange system 8, the pressure reducing system 9, the pressure detection module 10, and the oxygen content detection module 11, so as to realize monitoring and operation control thereof. The heat exchange system 8 and the pressure reducing system 9 in the deaerator 5 are connected in sequence. The oxygen content detection module 11 is used to detect the oxygen content of the water after being processed by the pressure reducing system 11. Thus, the newly incoming water and the return water flow through the heat exchange system 8 and the pressure reducing system 9 in sequence after being mixed. Among them, the heat exchange system 8 is connected to the heat-carrying waste gas of a boiler 12;

[0040] During the deaeration operation, the output end of the mixer 4 is connected to the heat exchange system 8, so that the mixed water flows through the heat exchange system 8. At the same time, the heat-carrying waste gas generated by the boiler combustion flows through the heat exchange system 8, so as to realize heat exchange between the waste gas and the mixed water, so as to heat the water. The heated water flows through the pressure reducing system 9 for pressure reduction to separate oxygen from the water, and the oxygen is discharged through an exhaust system. At the same time, the water after being processed enters the water using system 7 for use by the water using system 10 after discharging oxygen. When the water needs to be recycled after passing through the water using system 10, it flows back to the mixer 4 through the return pipeline 3. Among them, during the heat exchange process, the heat exchange amount of the water is calculated by the following formula:

[0041] R = M water × b water × (T wout - T win )

[0042] wherein, R represents the heat exchange amount of the heat exchange, M water represents the mass flow rate of the water, b water represents the specific heat capacity of the water, T wout represents the outlet temperature of the water, T win represents the inlet temperature of the water.

[0043] When the oxygen content in the water obtained by the oxygen content detection module 11 continuously exceeds the threshold for a certain period of time, an alarm is given through the alarm module 10 to remind the personnel to perform maintenance in a timely manner.

[0044] Preferably, a heating system 13 is further provided between the pipelines of the heat exchange system 8 and the pressure reduction system 9. The heating system 13 is connected to the host computer 1 for data communication. Thus, the host computer 1 controls the heating system 13 to heat the water flowing through the heat exchange system 8 through the heating system 13 to a suitable temperature.

[0045] Preferably, the pressure reduction system 9 further includes a water temperature detection module and an exhaust pump. The water temperature detection module obtains the water temperature T of the heated water. The exhaust pump is connected to the treatment tank to evacuate the treatment tank to provide a negative pressure. Its power is Pt, where Pt = k * 1 / T, and k is a constant.

[0046] Preferably, after the water flows through the pressure reduction system 9, it flows through the three-way valve 14 again. When the oxygen content detection module 9 detects that the water meets the water use requirements of the water use system 7, the three-way valve operates to let the water flow into the water use system 7 for water supply. If the water does not meet the water use requirements of the water use system 7, the three-way valve is controlled to return the water to the heat exchange system 8 for deaeration again.

[0047] Preferably, the fresh water addition pipeline 2 is further connected with a flow pump 15. The flow pump 15 is connected to the host computer 1 to realize the control of the water delivery power Pf of the flow pump 15 by the host computer 2; where the water delivery power Pf = k2 * Pt / T, and k2 is a constant.

[0048] Preferably, the oxygen content detection module 11 retrieves the oxygen content v in the water and sends it to the host computer 1. The host computer 1 adjusts the heating power Ph of the heating system 13 based on the detected oxygen content v and sends it to the heating system 13 to adjust the heating power Ph, where Ph = k 3 * 1 / v, where k 3 is a constant.

[0049] Preferably, analyze the deaeration efficiency of the deaerator. When the water volume Q generated by the deaerator 5 meets the requirements but the oxygen content v does not meet the requirements, according to the deaeration efficiency, the host computer 1 only increases the power Ph of the heating system 13 and / or the power Pt of the pressure reduction system 9. When the water volume Q generated by the deaerator 5 exceeds the requirements, the water delivery power Pf is reduced. The deaeration efficiency is calculated by the following formula:

[0050]

[0051] Among them, u represents the deoxygenation efficiency, P j represents the preliminary heating power, P h represents the heating power when adjusted to the heating system, P f represents the water conveyance power, P t represents the pressurization power, Q represents the amount of water produced, v represents the oxygen content in the water obtained by the oxygen content detection module, v 0 represents the initial oxygen content.

[0052] Furthermore, the preliminary heating power is calculated by the following formula:

[0053]

[0054] Among them, P j represents the preliminary heating power, m represents the mass of water flowing through the heating system per unit time, b represents the specific heat capacity of water, T h represents the temperature when adjusted to the heating system, T 0 represents the initial temperature, Δt represents the time interval.

[0055] Preferably, when the host computer 1 controls the flow pump 15, the decompression system 9 and the heating system 13, first monitor whether the amount of water Q produced by the deaerator 5 meets the demand. When the amount of water Q is lower than the demand, increase the water conveyance power Pf of the flow pump 15 to meet the water conveyance amount, and at the same time control the heating system 13 and the decompression system 9 to work so as to produce water with the oxygen content meeting the requirements. Specific Embodiment 2

[0057] A method for controlling the deaeration of a deaerator, including controlling the deaeration system of the deaerator, comprising the following steps:

[0058] Step S1, the host computer 1 collects the water conveyance power Pf, the power Pt of the exhaust pump, the pressure P detected by the pressure detection module 1, the temperature T of the water flowing through the decompression system, and the oxygen content v in the water obtained by the oxygen content detection module 11;

[0059] Step S2, when the amount of water Q is lower than the demand, increase the water conveyance power Pf of the flow pump 15 to meet the water conveyance amount, and at the same time control the heating system 13 and the decompression system 9 to work so as to produce water with the oxygen content meeting the requirements; the flow pump 15 is connected to the host computer 1 so as to realize controlling the water conveyance power Pf of the flow pump 15 through the host computer 2; wherein the water conveyance power Pf = k 2 *Pt / T, where k 2 is a constant;

[0060] Step S3, the oxygen content detection module 11 retrieves the oxygen content v in the water and sends it to the host computer 1. The host computer 1 adjusts the heating power Ph of the heating system 13 based on the detected oxygen content v and sends it to the heating system 13 to adjust the heating power Ph, where Ph = k 3 *1 / v, where k 3 is a constant;

[0061] Step S4, the water temperature detection module obtains the water temperature T of the heated water. The exhaust pump is connected to the treatment tank to evacuate the treatment tank to provide a negative pressure. Its power is Pt. If the amount of water that meets the requirements after being treated by the deaerator 5 is lower than the demand of the water use system, the reduction of the water delivery power Pf is stopped. By adjusting the power Pt of the exhaust pump, Pt = k*1 / T, where k is a constant;

[0062] Step S5, analyze the deaeration efficiency of the deaerator. When the amount of water Q generated by the deaerator (5) meets the requirements but the oxygen content v does not meet the requirements, according to the deaeration efficiency, the host computer (1) only increases the power Ph of the heating system (13) and / or the power Pt of the pressure reduction system (9). When the amount of water Q generated by the deaerator (5) exceeds the demand, the water delivery power Pf is reduced. Among them, the deaeration efficiency is calculated by the following formula:

[0063]

[0064] Among them, u represents the deaeration efficiency, P j represents the preliminary heating power, P h represents the heating power when adjusted to the heating system, P f represents the water delivery power, P t represents the pressurization power, Q represents the generated amount of water, v represents the oxygen content in the water obtained by the oxygen content detection module, v 0 represents the initial oxygen content.

[0065] Step S6, when the oxygen content detection module 9 detects that the water meets the water use requirements of the water use system 7, the three-way valve operates to let the water flow into the user system 7 for water supply. If the water does not meet the water use requirements of the water use system 7, the three-way valve is controlled to return the water to the heat exchange system 8 for deaeration again.

[0066] Preferably, a solar water heater is provided between the mixer 4 and the heat exchange system 8. The water passing through the mixer 4 is preheated by the solar water heater.

[0067] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A system for controlling deoxygenation of a deaerator, comprising a host computer (1), a new water adding pipeline (2), a return water pipeline (3), a mixer (4), a deaerator (5) and an alarm module (6), wherein the input end of the mixer (4) is connected to the new water inlet pipeline (2) and the return water pipeline (3), the water mixed by the mixer (4) flows into the deaerator (5) for deoxygenation and then flows into a water system (7) for use by the water system (7); the water passing through the water system (7) enters the mixer (4) through the return water pipeline (4); the host computer (1) is respectively connected to the mixer (4), the deaerator (5) and the alarm module (6) for data communication, so that the mixer (4), the deaerator (5) and the alarm module (6) are monitored and controlled by the host computer (1); Features: The deaerator (5) comprises a heat exchange system (8), a pressure reduction system (9), a pressure detection module (10), and an oxygen content detection module (11); the host computer (1) is respectively connected to the heat exchange system (8), the pressure reduction system (9), the pressure detection module (10), and the oxygen content detection module (11) for data communication so as to monitor and control them; the heat exchange system (8) and the pressure reduction system (9) in the deaerator (5) are connected in sequence, and the oxygen content detection module (11) is used to detect the oxygen content of the water after being treated by the pressure reduction system (11); thus, the newly-incoming water and the returned water, after being mixed, flow through the heat exchange system (8) and the pressure reduction system (9) in sequence; wherein the heat exchange system (8) is connected to the hot exhaust gas of the boiler (12); During the deoxygenation operation, the output end of the mixer (4) is connected to a heat exchange system (8) so that the mixed water flows through the heat exchange system (8). At the same time, the hot exhaust gas generated by the combustion of the boiler flows through the heat exchange system (8), thereby realizing heat exchange between the hot exhaust gas and the mixed water, so as to heat the water; the heated water flows through a pressure reducing system (9) to reduce the pressure so that oxygen and the water are separated, and the oxygen is discharged through the exhaust system. At the same time, the treated water enters the water use system (7) after the oxygen is discharged for use by the water use system (10). When the water after passing through the water use system (10) needs to be recovered, it flows back to the mixer (4) through the reflux pipeline (3); When the water oxygen content acquired by the oxygen content detection module (11) continues to exceed a threshold value for a certain period of time, an alarm is issued through the alarm module (10) to remind personnel to perform maintenance in a timely manner.

2. According to the deaerator deoxygenation control system according to claim 1, a heating system (13) is also provided in the pipeline between the heat exchange system (8) and the pressure reducing system (9), and the heating system (13) is connected to the host computer (1) by data communication, so that the host computer (1) controls the heating system (13) to heat the water after passing through the heat exchange system (8) through the heating system (13) so as to heat it to a suitable temperature.

3. The deaerator deoxygenation control system according to claim 2, characterized in that: The decompression system (9) further comprises a water temperature detection module and an exhaust pump, wherein the water temperature detection module obtains the water temperature T of the heated water, and the exhaust pump is connected to the treatment tank to evacuate the treatment tank to provide negative pressure, and its power is Pt, wherein Pt=k*1 / T, wherein k is a constant.

4. The deaerator deoxygenation control system according to claim 2, characterized in that: After the water flows through the pressure reducing system (9), it flows through the three-way valve (14) again. When the oxygen content detection module (9) detects that the water meets the water demand of the water use system (7), the three-way valve is operated to allow the water to flow into the water use system (7) for water supply. If the water does not meet the water demand of the water use system (7), the three-way valve is controlled to return the water to the heat exchange system (8) for deoxygenation again.

5. The deaerator deoxygenation control system according to claim 3, characterized in that: The new water adding pipeline (2) is also connected to a flow pump (15), and the flow pump (15) is connected to the host computer (1) so as to control the water transmission power Pf of the flow pump (15) through the host computer (2); wherein the water transmission power Pf = k2*Pt / T, wherein k2 is a constant.

6. The deaerator deoxygenation control system according to claim 2 or 5, characterized in that: The oxygen content detection module (11) retrieves the oxygen content v in the water and sends it to the host computer (1). The host computer (1) adjusts the heating power Ph of the heating system (13) based on the detected oxygen content v and sends it to the heating system (13) to adjust the heating power Ph, where Ph=k3*1 / v, where k3 is a constant.

7. The deaerator deoxygenation control system according to claim 6, characterized in that: When the amount of water Q produced by the deaerator (5) meets the demand but the oxygen content v does not meet the requirement, the host computer (1) only increases the power Ph of the heating system (13) and / or the power Pt of the pressure reducing system (9); when the amount of water Q produced by the deaerator (5) exceeds the demand, the water delivery power Pf is reduced.

8. The deaerator deoxygenation control system according to claim 6 or 7, characterized in that: When the upper computer (1) controls the flow pump (15), the pressure reducing system (9) and the heating system (13), it first monitors whether the water volume Q produced by the deaerator (5) meets the demand. When the water volume Q is lower than the demand, the water delivery power Pf of the flow pump (15) is increased to meet the water delivery volume, and at the same time, the heating system (13) and the pressure reducing system (9) are controlled to work so as to produce water with an oxygen content that meets the requirements.

9. A method for controlling deoxygenation in a deaerator, comprising the system for controlling deoxygenation in a deaerator according to any one of claims 1 to 8, characterized in that: The steps include: Step S1, the host computer (1) collects the water delivery power Pf, the power Pt of the exhaust pump, the pressure P detected by the pressure detection module (1), the temperature T of the water flowing through the decompression system, and the oxygen content v in the water obtained by the oxygen content detection module (11); Step S2, when the water volume Q is lower than the demand, the water delivery power Pf of the flow pump (15) is increased to meet the water delivery volume, and at the same time, the heating system (13) and the pressure reducing system (9) are controlled to work so as to produce water with the oxygen content meeting the requirement; the flow pump (15) is connected to the host computer (1) so as to control the water delivery power Pf of the flow pump (15) through the host computer (2); wherein the water delivery power Pf = k2*Pt / T, where k2 is a constant; Step S3, the oxygen content detection module (11) retrieves the oxygen content v in the water and sends it to the host computer (1), and the host computer (1) adjusts the heating power Ph of the heating system (13) based on the detected oxygen content v and sends it to the heating system (13) to adjust the heating power Ph, wherein Ph=k3*1 / v, wherein k3 is a constant; Step S4, the water temperature detection module obtains the water temperature T of the heated water, the exhaust pump is connected to the treatment tank, and the treatment tank is evacuated to provide negative pressure. If the amount of water that meets the requirements after treatment by the deaerator (5) is lower than the demand of the water use system, the water delivery power Pf is stopped from being reduced, and the power Pt of the exhaust pump is adjusted, Pt=k*1 / T, where k is a constant; Step S5, analyzing the deoxygenation efficiency of the deaerator. When the amount of water Q generated by the deaerator (5) meets the requirement but the oxygen content v does not meet the requirement, the host computer (1) only increases the power Ph of the heating system (13) and / or the power Pt of the pressure reducing system (9) according to the deoxygenation efficiency. When the amount of water Q generated by the deaerator (5) exceeds the requirement, the water delivery power Pf is reduced. Step S6, when the oxygen content detection module (9) detects that the water meets the water demand of the water use system (7), the three-way valve is operated to allow the water to flow into the user system (7) for water supply; if the water does not meet the water demand of the water use system (7), the three-way valve is controlled to return the water to the heat exchange system (8) for deoxygenation again.

10. A method and system for controlling deoxygenation of a deaerator according to claim 9, characterized in that: A solar water heater is provided between the mixer (4) and the heat exchange system (8), and the water passing through the mixer (4) is preheated by the solar water heater.

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