An oxygen deaerator parallel operation device and method

Abstract

This application relates to a deaerator parallel operation device, which is characterized in that it includes: a first deaerator, a second deaerator, an overflow and drain header pipe, a downcomer header pipe, a water balance header pipe, and other header pipes including a steam balance header pipe. The two deaerators are connected in parallel through the steam balance header pipe and the water balance header pipe; an oxygen discharge valve is installed on each deaerator. The overflow and drain header pipe and the downcomer header pipe are respectively shunted through two parallel pipes, and at least one valve is installed on each of the parallel pipes. The other header pipes including the steam balance header pipe are respectively shunted through a single connection pipe, and at least one valve is installed on each of the single connection pipes. This application also provides a deaerator parallel operation method, which directly injects water with qualified water temperature and water quality into the deaerator, forms a connection through the water balance header pipe, balances the pressure through the steam balance header pipe, and maintains the water temperature, water level, and pressure within a qualified difference range. This method has a short parallel time and simple operation.

Description

Technical Field

[0001] The present invention relates to the field of boiler feed water treatment, and particularly to a deaerator parallel operation device and method. Background Art

[0002] In the process of boiler feed water treatment, deaeration is a very crucial link. The temperature of boiler feed water is relatively high, providing conditions for oxygen to dissolve into the feed water. Excessive oxygen dissolved in the feed water will cause corrosion of the boiler feed water system and components. Corrosive substances including iron oxide will enter the boiler, deposit or adhere to the boiler tube wall and heating surface, forming iron scale that is insoluble and has poor heat transfer. The corrosive iron scale will cause pitting on the inner wall of the pipeline, increasing the resistance coefficient; when the pipeline is severely corroded, even pipeline explosion accidents may occur. Therefore, deaeration operation is required in boiler feed water treatment.

[0003] In production, deaerators are often used for deaeration to ensure the quality of boiler feed water. When water contacts oxygen, a part of the oxygen dissolves in the water, and the dissolved amount is expressed by the oxygen solubility, which is related to the pressure and temperature of oxygen on the water surface. At a certain pressure, the higher the temperature of the water, the smaller the oxygen solubility; conversely, the oxygen solubility is larger. At the same time, the higher the partial pressure of oxygen on the water surface, the larger its solubility, and vice versa. In the total pressure of the gas mixture on the liquid surface, including the partial pressure of water vapor, when the water is heated, the partial pressure of water vapor near the liquid surface will increase, and the corresponding partial pressure of oxygen near the liquid surface will decrease. When the water is heated to the boiling point, the partial pressure of water vapor will approach the total pressure of the gas mixture on the liquid surface, and at this time, the partial pressure of oxygen on the liquid surface is almost close to zero, so oxygen will be completely removed from the water. Therefore, the deaerator deaeration needs to control the temperature of the water in the deaerator and the pressure of oxygen on the water surface. The working principle of the deaerator is to use steam to heat the water to make the water reach the saturation temperature at a certain pressure, that is, the boiling point. At this time, the space of the deaerator is filled with water vapor, and the partial pressure of oxygen gradually decreases to zero, and the oxygen dissolved in the water will all escape to ensure that the oxygen content of the feed water is qualified.

[0004] Performing parallel operation on the deaerator helps oxygen escape smoothly and maintain stable supply of boiler feed water. However, in the prior art, when performing parallel operation on the deaerator, the water in the deaerator needs to be heated first and then paralleled. The water temperature needs to be heated from normal temperature to the working temperature, and the required parallel operation time is too long; at the same time, the method of parallel operation of the deaerator in the prior art is complex, and it is difficult to control the water temperature, water level, and pressure of the deaerator. The operation difficulty is large, and it is easy to have a deviation in the water level of the deaerator, seriously threatening the safe operation of the deaerator.

[0005] That is, in the prior art, the parallel operation time of the deaerator is long and the operation is complex. During parallel operation, it is difficult to control the water level and pressure of the two deaerators, and there is a lack of a deaerator operation device and operation method that can achieve rapid parallel operation of the deaerator and has a simple operation. Summary of the Invention

[0006] The object of the present invention is to provide a deaerator parallel operation device and method, which are used to solve the problems in the prior art that in order to achieve deaeration, parallel operation of the deaerator is carried out, the water in the deaerator is heated and then paralleled, the parallel time required to heat the water temperature from normal temperature to the working temperature is long, and during the parallel operation, it is difficult to control the water levels and pressures of the two deaerators.

[0007] To achieve the above object, the present invention proposes the following technical solutions:

[0008] In the first aspect of the present application, a deaerator parallel operation device is proposed, including: a first deaerator, a second deaerator, an overflow and drain header pipe, a steam balance header pipe, a downcomer header pipe, a condensate header pipe, a heating steam header pipe, a feed pump recirculation header pipe, a drainage pump feed water header pipe, a demineralized water heater outlet header pipe, a high-pressure heater drain header pipe, and a water balance header pipe;

[0009] The first deaerator and the second deaerator are connected in parallel through the steam balance header pipe and the water balance header pipe; a first oxygen discharge valve is connected to the first deaerator; a second oxygen discharge valve is connected to the second deaerator;

[0010] The first deaerator and the second deaerator are respectively branched to the overflow and drain header pipe and the downcomer header pipe through two parallel pipelines, and at least one valve is installed on each parallel pipeline;

[0011] The steam balance header pipe, the condensate header pipe, the heating steam header pipe, the feed pump recirculation header pipe, the drainage pump feed water header pipe, the demineralized water heater outlet header pipe, and the high-pressure heater drain header pipe are respectively branched to the first deaerator and the second deaerator through a single-connected pipeline, and at least one valve is installed on each single-connected pipeline.

[0012] Further, the installation heights of the overflow and drain header pipe and the downcomer header pipe are lower than the installation heights of the first deaerator and the second deaerator.

[0013] Further, a heating steam front stop valve, a heating steam electric control valve, and a heating steam rear stop valve are sequentially installed on the single-connected pipelines of the heating steam header pipe leading to the first deaerator and the second deaerator.

[0014] Further, a demineralized water make-up front stop valve, a make-up water electric control valve, and a make-up water rear stop valve are sequentially installed on the single-connected pipelines of the demineralized water heater outlet header pipe leading to the first deaerator and the second deaerator.

[0015] Further, at least one valve is respectively installed on the connections of the first deaerator and the second deaerator to the water balance header pipe.

[0016] Further, at least two safety valves are installed on the water tanks and deaeration towers of the first deaerator and the second deaerator respectively.

[0017] Further, the material of the water balance main pipe is a high-temperature resistant material.

[0018] Further, the driving modes of the valves on the parallel pipes, the valves on the single-connected pipes, the first oxygen discharge valve and the second oxygen discharge valve include at least one of the following: electric, hydraulic, pneumatic and manual.

[0019] In the second aspect of the present application, a method for parallel operation of deaerators is proposed, including:

[0020] Step 1: After the first deaerator operates, fully open the valve on the water balance main pipe connected to the first deaerator, open the valve on the water balance main pipe connected to the second deaerator by less than a preset amplitude, inject water into the second deaerator, observe the vibration condition of the second deaerator, and gradually open the valve on the water balance main pipe connected to the second deaerator.

[0021] Step 2: Open the second oxygen discharge valve to discharge the oxygen in the second deaerator. When the water level of the second deaerator is close to the water level of the first deaerator, test the water quality and dissolved oxygen of the second deaerator.

[0022] Step 3: After the water quality and dissolved oxygen are qualified, keep the valve on the water balance main pipe connected to the second deaerator open. After the water levels of the first deaerator and the second deaerator are equal, fully open the valve on the steam balance main pipe connected to the first deaerator, and slowly fully open the valve on the steam balance main pipe connected to the second deaerator, and observe and maintain the pressures and water levels of the first deaerator and the second deaerator to be basically the same.

[0023] Step 4: Slowly fully open the valve on the water balance main pipe connected to the second deaerator.

[0024] Step 5: Slowly fully open the valve on the lower water main pipe connected to the second deaerator.

[0025] Step 6: Slowly open the valves on the respective main pipes connecting the condensate water main pipe, the feed water pump recirculation main pipe, the drain pump feed water main pipe, the demineralized water heater outlet main pipe and the high-pressure heater drain main pipe to the second deaerator. At the same time, fully open the front cut-off valve and the rear cut-off valve of the heating steam leading to the second deaerator on the heating steam main pipe, and adjust the heating steam electric control valve on this main pipe to keep the water levels, water temperatures and pressures of the first deaerator and the second deaerator within a qualified difference.

[0026] Furthermore, when maintaining the water levels, water temperatures, and pressures of the first deaerator and the second deaerator within a qualified difference range in Step 6, the difference in water level between the first deaerator and the second deaerator is not greater than 20 mm; the difference in water temperature between the first deaerator and the second deaerator is less than 10 °C; and the difference in pressure between the first deaerator and the second deaerator is not greater than 0.02 MPa.

[0027] Beneficial effects:

[0028] As can be seen from the above technical solutions, the technical solutions of the present invention provide a deaerator parallel operation device and method. By injecting water with qualified water temperature and quality from the first deaerator into the second deaerator, it is not necessary to first heat the water in the second deaerator until the water temperature, pressure, and water level of the second deaerator are the same as those of the first deaerator and then parallel with the first deaerator. This shortens the parallel time and reduces the operation difficulty. At the same time, by forming a connection through the steam balance main pipe and the water balance main pipe, the difference in water level and pressure difference between the first deaerator and the second deaerator are maintained within a qualified difference range. Through the operation device and method, the first deaerator and the second deaerator meet the parallel conditions and achieve rapid deaeration. The whole process is simple to operate, with little operation difficulty, and it is easy to maintain the water temperature, water level, and pressure within a qualified difference range.

[0029] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not conflict with each other.

[0030] The foregoing and other aspects, embodiments, and features of the teachings of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will be apparent in the following description or will be learned through practice of the specific embodiments according to the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are not drawn to scale in accordance with actual reference objects. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the drawings, wherein:

[0032] Figure 1 is a schematic structural diagram of the deaerator parallel operation device in the embodiment of the present application.

[0033] In the figure, the meanings of the respective reference numerals are as follows:

[0034] No.1 deaerator 1; No.2 deaerator 2; No.1 exhaust oxygen valve 3; No.2 exhaust oxygen valve 4; overflow and drain header 5; steam balance header 6; downcomer header 7; condensate header 8; heating steam header 9; feed pump recirculation header 10; drainage pump supply water header 11; demineralized water heater outlet header 12; high-pressure heater drain header 13; horizontal balance header 14. Specific implementation mode

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains.

[0036] The "first", "second" and similar terms used in the specification and claims of this patent application of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, singular forms such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. The terms such as "including" or "comprising" mean that the elements or objects appearing before "including" or "comprising" cover the features, wholes, steps, operations, elements and / or components listed after "including" or "comprising", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms such as "upper", "lower", "left" and "right" are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0037] In the prior art, when deaerators are operated in parallel, the water in the deaerators needs to be heated first and then paralleled. The water temperature needs to be heated from room temperature to the working temperature, and the required parallel operation time is too long. At the same time, the method for parallel operation of deaerators in the prior art is complex, and it is difficult to control the water temperature, water level and pressure of the deaerators. The operation difficulty is large, and it is easy to have a deviation in the water level of the deaerator, which seriously threatens the safe operation of the deaerator. In view of this, the present invention conceives a parallel operation device and method for deaerators, which are used to shorten the parallel operation time and are simple to operate.

[0038] This embodiment provides a method as Figure 1The deaerator parallel operation device shown includes: No. 1 deaerator 1, No. 2 deaerator 2, overflow and drain header 5, steam balance header 6, downcomer header 7, condensate header 8, heating steam header 9, feed pump recirculation header 10, condensate pump supply header 11, demineralized water heater outlet header 12, high-pressure heater drain header 13, and water balance header 14.

[0039] The No. 1 deaerator 1 and the No. 2 deaerator 2 are connected in parallel through the steam balance header 6 and the water balance header 14; a No. 1 oxygen exhaust valve 3 is connected to the No. 1 deaerator 1; a No. 2 oxygen exhaust valve 4 is connected to the No. 2 deaerator 2.

[0040] After the two deaerators are connected, each header needs to be connected to these two deaerators. The connection methods of each header are as follows:

[0041] The No. 1 deaerator 1 and the No. 2 deaerator 2 are respectively branched to the overflow and drain header 5 and the downcomer header 7 through two parallel pipelines, and at least one valve is installed on each parallel pipeline.

[0042] The overflow and drain water of the No. 1 deaerator 1 and the No. 2 deaerator 2 respectively converge to the overflow and drain header 5; the outlet water of the No. 1 deaerator 1 and the No. 2 deaerator 2 respectively converge to the downcomer header 7.

[0043] The steam balance header 6, the condensate header 8, the heating steam header 9, the feed pump recirculation header 10, the condensate pump supply header 11, the demineralized water heater outlet header 12, and the high-pressure heater drain header 13 are respectively branched to the No. 1 deaerator 1 and the No. 2 deaerator 2 through an individual connection pipeline, and at least one valve is installed on each individual connection pipeline.

[0044] When using this device for parallel operation, the No. 1 deaerator 1 needs to run first, and then the feed water is put into the No. 2 deaerator 2. To achieve the parallel operation of the two deaerators, the following aspects need to be completed:

[0045] The first aspect of shortening the time for deaerator parallel operation lies in shortening the required heating-up time. The qualified-temperature feed water is directly introduced from the No. 1 deaerator 1 into the No. 2 deaerator 2, without spending too much time heating inside the deaerator.

[0046] The second aspect of shortening the parallel operation time of the deaerator lies in quickly achieving equal water levels. Through the water balance main pipe 14, a "U"-shaped communicating vessel is formed with the first deaerator 1 and the second deaerator 2 to balance the water levels faster. Moreover, at least two valves are installed on the water balance main pipe 14, which are opened and closed according to the speed of water level balance. If the water level balance is slow, they are opened; otherwise, they are closed. In addition, the installation heights of the overflow and drain water main pipe 5 and the down water main pipe 7 are lower than those of the first deaerator 1 and the second deaerator 2. At the same time, the overflow and drain water main pipe 5 can discharge the water at a high water level.

[0047] The third aspect of shortening the parallel operation time of the deaerator lies in the internal pressure control of the deaerator. On the individual connecting pipes of the heating steam main pipe 9 leading to the first deaerator 1 and the second deaerator 2, a heating steam front stop valve, a heating steam electric regulating valve, and a heating steam rear stop valve are installed in sequence; on the individual connecting pipes of the demineralized water heater outlet main pipe 12 leading to the first deaerator 1 and the second deaerator 2, a demineralized water make-up front stop valve, a make-up water electric regulating valve, and a make-up water rear stop valve are installed in sequence. Considering the relatively high temperatures of the two main pipes, electric valves are selected for control, which is safer and more effective; at the same time, on these two pipes, due to temperature changes causing pressure changes, corresponding regulating valves need to be set to regulate the pressure to ensure that the internal pressure of the deaerator is within the qualified difference range. In addition, by opening and closing the valves on the steam balance main pipe 6, the pressures brought by the steam inside the first deaerator 1 and the second deaerator 2 are balanced again, and finally, the pressures of the first deaerator 1 and the second deaerator 2 are kept stable within the qualified range.

[0048] The fourth aspect of shortening the parallel operation time of the deaerator lies in ensuring the addition of safety devices to ensure the stable operation of the device. The material of the water balance main pipe 14 is selected as a high-temperature resistant material, so that when the two deaerators are operating in parallel, the water balance main pipe 14 can be used for a long time; at least two safety valves are installed on the water tanks and deaeration towers of the first deaerator 1 and the second deaerator 2 to prevent unqualified factors during operation from threatening the safe operation of the deaerator and forcing it to be automatically tripped.

[0049] The fifth aspect of shortening the parallel operation time of the deaerator lies in selecting appropriate valves for the device. The driving methods of the valves on the parallel pipes, the valves on the individual connecting pipes, the first oxygen discharge valve 3, and the second oxygen discharge valve 4 include at least one of the following: electric, hydraulic, pneumatic, and manual. According to production needs and considering the safety of workers' operations, different driving methods are selected for different valves. For example, on the individual connecting pipes corresponding to some main pipes with relatively high temperatures, non-manual driving methods such as electric, hydraulic, and pneumatic are selected to ensure the safety of workers; for another example, on some pipes with less manual operation, manual driving methods are selected for operation.

[0050] This embodiment also provides an operation method for the parallel operation device of the deaerator, including the following steps:

[0051] Step 1: After the No. 1 deaerator 1 operates, fully open the valve on the water balance main pipe 14 connected to the No. 1 deaerator 1, open the valve on the water balance main pipe 14 connected to the No. 2 deaerator 2 by less than a preset amplitude, inject water into the No. 2 deaerator 2, observe the vibration condition of the No. 2 deaerator 2, and gradually open the valve on the water balance main pipe 14 connected to the No. 2 deaerator 2;

[0052] Step 2: Open the No. 2 oxygen discharge valve 4 to discharge the oxygen in the No. 2 deaerator 2. When the water level of the No. 2 deaerator 2 is close to the water level of the No. 1 deaerator 1, test the water quality and dissolved oxygen of the No. 2 deaerator 2;

[0053] Step 3: After the water quality and dissolved oxygen are qualified, keep the valve on the water balance main pipe 14 connected to the No. 2 deaerator 2 open. After the water levels of the No. 1 deaerator 1 and the No. 2 deaerator 2 are equal, fully open the valve on the steam balance main pipe 6 connected to the No. 1 deaerator 1, and slowly fully open the valve on the steam balance main pipe 6 connected to the No. 2 deaerator 2, and observe and maintain the pressures and water levels of the No. 1 deaerator 1 and the No. 2 deaerator 2 to be basically the same;

[0054] Step 4: Slowly fully open the valve on the water balance main pipe 14 connected to the No. 2 deaerator 2;

[0055] Step 5: Slowly fully open the valve on the lower water main pipe 7 connected to the No. 1 deaerator 1;

[0056] Step 6: Slowly open the valves on the respective main pipes of the condensate water main pipe 8, the recirculation main pipe of the feed water pump 10, the feed water main pipe from the drain pump 11, the outlet main pipe of the demineralized water heater 12, and the drain main pipe from the high-pressure heater 13 connected to the No. 2 deaerator 2. At the same time, fully open the front stop valve and the rear stop valve of the heating steam leading to the No. 2 deaerator 2 on the heating steam main pipe 9, and adjust the electric regulating valve of the heating steam on this main pipe to keep the water levels, water temperatures, and pressures of the No. 1 deaerator 1 and the No. 2 deaerator 2 within a qualified difference.

[0057] To ensure the stable operation of the deaerator, when keeping the water levels, water temperatures, and pressures of the No. 1 deaerator 1 and the No. 2 deaerator 2 within a qualified difference, the difference in water levels between the No. 1 deaerator 1 and the No. 2 deaerator 2 is not greater than 20 mm; the difference in water temperatures between the No. 1 deaerator 1 and the No. 2 deaerator 2 is less than 10 °C; the difference in pressures between the No. 1 deaerator 1 and the No. 2 deaerator 2 is not greater than 0.02 MPa.

[0058] In summary, by injecting water with qualified water temperature and quality from the first deaerator 1 into the second deaerator 2, it is not necessary to first heat the water in the second deaerator 2 to make the water temperature, pressure, and water level of the second deaerator 2 the same as those of the first deaerator 1 and then parallel with the first deaerator 1, which shortens the parallel time and reduces the operation difficulty. At the same time, through the connection of the steam balance main pipe 6 and the water balance main pipe 14, the water levels and pressures of the first deaerator 1 and the second deaerator 2 are jointly maintained within the qualified difference range. Through the operation device and method, the first deaerator 1 and the second deaerator 2 meet the parallel conditions and rapid deaeration is achieved. The operation is simple throughout the process, the operation difficulty is small, and the difficulty of maintaining the water temperature, water level, and pressure within the qualified difference range is reduced.

[0059] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the claims.

Claims

1. An operation method for an operation device of deaerators in parallel. The first deaerator (1) and the second deaerator (2) are connected in parallel through a steam balance main pipe (6) and a water balance main pipe (14). A first oxygen discharge valve (3) is connected to the first deaerator (1). A second oxygen discharge valve (4) is connected to the second deaerator (2). The first deaerator (1) and the second deaerator (2) are respectively branched to an overflow and drain water main pipe (5) and a down water main pipe (7) through two parallel pipes, and at least one valve is installed on each of the parallel pipes. The steam balance main pipe (6), the condensate water main pipe (8), the heating steam main pipe (9), the feed water pump recirculation main pipe (10), the drain pump feed water main pipe (11), the demineralized water heater outlet main pipe (12), and the high-pressure heater drain water main pipe (13) are respectively branched to the first deaerator (1) and the second deaerator (2) through an independent connecting pipe, and at least one valve is installed on each of the independent connecting pipes. It is characterized in that, Including: Step 1: After the No. 1 deaerator (1) operates, fully open the valve on the water balance main pipe (14) connected to the No. 1 deaerator (1), open the valve on the water balance main pipe (14) connected to the No. 2 deaerator (2) by less than a preset amplitude, inject water into the No. 2 deaerator (2), observe the vibration condition of the No. 2 deaerator (2), and gradually open the valve on the water balance main pipe (14) connected to the No. 2 deaerator (2). Step 2: Open the No. 2 oxygen discharge valve (4) to discharge the oxygen in the No. 2 deaerator (2). When the water level of the No. 2 deaerator (2) is close to the water level of the No. 1 deaerator (1), test the water quality and dissolved oxygen of the No. 2 deaerator (2). Step 3: After the water quality and dissolved oxygen are qualified, keep the valve on the water balance main pipe (14) connected to the No. 2 deaerator (2) open. After the water levels of the No. 1 deaerator (1) and the No. 2 deaerator (2) are equal, fully open the valve on the steam balance main pipe (6) connected to the No. 1 deaerator (1), and slowly fully open the valve on the steam balance main pipe (6) connected to the No. 2 deaerator (2), and observe and maintain the pressures and water levels of the No. 1 deaerator (1) and the No. 2 deaerator (2) to be basically the same. Step 4: Slowly fully open the valve on the water balance main pipe (14) connected to the No. 2 deaerator (2). Step 5: Slowly fully open the valve on the downcomer main pipe (7) connected to the No. 2 deaerator (2). Step 6: Slowly open the valves on the respective main pipes of the condensate main pipe (8), the feed water pump recirculation main pipe (10), the drain pump feed water main pipe (11), the demineralized water heater outlet main pipe (12), and the high-pressure heater drain main pipe (13) connected to the No. 2 deaerator (2). At the same time, fully open the front stop valve and the rear stop valve of the heating steam leading to the No. 2 deaerator (2) on the heating steam main pipe (9), and adjust the heating steam electric control valve on this main pipe to keep the water levels, water temperatures, and pressures of the No. 1 deaerator (1) and the No. 2 deaerator (2) within a qualified difference.

2. The operating method of a deaerator parallel operation device according to claim 1, characterized in that: The installation heights of the overflow water main pipe (5) and the downcomer main pipe (7) are lower than the installation heights of the No. 1 deaerator (1) and the No. 2 deaerator (2).

3. The operating method of a deaerator parallel operation device according to claim 1, characterized in that: On the individual pipes of the heating steam main pipe (9) leading to the No. 1 deaerator (1) and the No. 2 deaerator (2), a front stop valve for heating steam, a heating steam electric control valve, and a rear stop valve for heating steam are installed in sequence.

4. The operating method of a deaerator parallel operation device according to claim 1, characterized in that: On the individual pipes of the demineralized water heater outlet main pipe (12) leading to the No. 1 deaerator (1) and the No. 2 deaerator (2), a front stop valve for demineralized water make-up, a make-up water electric control valve, and a rear stop valve for make-up water are installed in sequence.

5. The operation method of a deaerator parallel operation device according to claim 1, characterized in that: At least one valve is installed respectively on the connections of the No. 1 deaerator (1) and the No. 2 deaerator (2) to the water balance main pipe (14).

6. The operation method of a deaerator parallel operation device according to claim 1, characterized in that: At least two safety valves are installed on the water tanks and deaeration towers of the first deaerator (1) and the second deaerator (2).

7. The operation method of a parallel operation device for a deaerator according to claim 1, characterized in that: The material of the water balance main pipe (14) is a high-temperature resistant material.

8. The operating method of a deaerator parallel operation device according to claim 1, characterized in that: The driving modes of the valves on the parallel pipes, the valves on the single-connected pipes, the first oxygen discharge valve (3) and the second oxygen discharge valve (4) include at least one of the following: electric, hydraulic, pneumatic and manual.

9. The operation method of a deaerator parallel operation device according to claim 1, characterized in that: When maintaining the water levels, water temperatures and pressures of the first deaerator (1) and the second deaerator (2) within a qualified difference range in step six, the difference in water level between the first deaerator (1) and the second deaerator (2) is not greater than 20 mm; the difference in water temperature between the first deaerator (1) and the second deaerator (2) is less than 10 °C; the difference in pressure between the first deaerator (1) and the second deaerator (2) is not greater than 0.02 MPa.

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