Corrosion prevention system and method for condenser of heat supply unit

Abstract

The invention relates to the technical field of condenser corrosion prevention, in particular to a heat supply unit condenser corrosion prevention system and method, and the heat supply unit condenser corrosion prevention system comprises a main module, a water supplementing module and a low-pressure heater drainage module. The corrosion of the condenser of the heat supply unit can be inhibited by increasing the pH value of the replenished water, the corrosion of the low-pressure heater drainage module can be inhibited by adding oxygen through the low-pressure heater drainage module, on one hand, the corrosion products substituted into the condenser are reduced by adding oxygen through the low-pressure heater drainage module, and on the other hand, the corrosion of the condenser is inhibited by increasing the pH value of the replenished water. The two operation modes are ingeniously combined, iron pollution caused by fine treatment can be effectively reduced, and the service life of the prefilter and the mixed bed is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of condenser anti-corrosion, and in particular to a system and method for anti-corrosion of a condenser of a heating unit. Background Art

[0002] Since the exhaust steam from the low-pressure cylinder of the heating unit to the condenser is relatively small, a large amount of desalted water needs to be added to the condenser, resulting in a condensate pH of about 8.5. The low pH causes serious corrosion of the condenser. At the same time, when the low-pressure heater is made of carbon steel, the low-pressure heater drain system is severely corroded, resulting in a high iron content in the low-pressure heater drain recovered to the condenser. On the one hand, the iron substituted into the condenser is high, and on the other hand, the condenser itself is corroded, so the condensate has a high iron content, which makes the pre-filter of the fine treatment system covered with a large amount of iron, shortening the life of the pre-filter. After the iron penetrates the pre-filter, it will poison the resin in the mixed bed, reduce the resin exchange capacity, reduce the water production, increase the regeneration frequency, and increase the amount of fine treatment regeneration wastewater. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] The present invention is proposed in view of the above-mentioned problem that the condenser is easily corroded.

[0005] Therefore, an object of the present invention is to provide a condenser anti-corrosion system for a heating unit.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a condenser anti-corrosion system for a heating unit, comprising a main module, a water make-up module, and a low-pressure heater drain module; the main module comprises a condenser and a condensate pump arranged at the outlet of the condenser, a fine treatment connected to the outlet of the condensate pump, the fine treatment connected to a low-pressure heater, and a sampling tube is also provided at the outlet of the condensate pump, and a conductivity meter and a first corrosion product monitor are arranged on the sampling tube; the water make-up module comprises a pipeline mixer connected to the inlet of the condenser, a first desalted water pump connected to the inlet of the pipeline mixer, and a dosing pump connected to the inlet of the pipeline mixer; the low-pressure heater drain module comprises a second desalted water pump connected to the steam side inlet of the low-pressure heater, a low-pressure heater drain pump connected to the steam side outlet of the low-pressure heater, and a sampling tube is also provided at the outlet of the low-pressure heater drain pump, and a dissolved oxygen meter and a second corrosion product monitor are arranged on the sampling tube.

[0007] As a preferred solution of the condenser anti-corrosion system of the heating unit described in the present invention, the main module also includes a low-pressure cylinder, the exhaust side of the low-pressure cylinder is connected to the condenser inlet, and the low-pressure cylinder also has a pipeline that merges with the second desalted water pump.

[0008] As a preferred solution of the condenser anti-corrosion system of the heating unit described in the present invention, the condensate pump is interlocked with the first desalted water pump, and the flow of the first desalted water pump is controlled according to the target flow of the condensate pump; the second desalted water pump is interlocked with the low-pressure drain pump, and is adjusted according to feedback from the dissolved oxygen meter and the second corrosion product monitor.

[0009] The present invention also provides the following technical solution: A method for anti-corrosion of a condenser of a heating unit, used in the above-mentioned anti-corrosion system of a condenser of a heating unit, further comprising the following steps:

[0010] S1, monitoring the condenser and low-pressure heater drain data through instruments;

[0011] S2, adjust the system flow according to the instrument data and adjust various data to the target value;

[0012] S3, when all values ​​are adjusted to meet the standards, maintain stable operation.

[0013] As a preferred solution of the condenser anticorrosion method of the heating unit described in the present invention, wherein: S2 also includes:

[0014] S2.1, adjust the water supply from the water supply module to the condenser according to the instrument data, and adjust the conductivity and corrosion product content;

[0015] S2.2, adjust the flow rate of the second desalted water pump in the low-pressure drain module according to the instrument data, and adjust the dissolved oxygen value and corrosion product content of the low-pressure drain.

[0016] As a preferred solution of the condenser anti-corrosion method for a heating unit described in the present invention, wherein: in S2.1, water from the desalted water tank and ammonia solution from the ammonia adding room are mixed, and the flow rate of the dosing pump is adjusted according to the conductivity and corrosion product data monitored by the conductivity meter and the first corrosion product monitor.

[0017] As a preferred solution of the condenser anti-corrosion method for a heating unit described in the present invention, in S2.2, the flow rate of the second desalted water pump is adjusted according to the data monitored by the second corrosion product monitor and the dissolved oxygen meter.

[0018] As a preferred solution of the condenser anti-corrosion method for a heating unit described in the present invention, before mixing the desalted water tank and the ammonia solution in the ammonia adding room, the flow rate of the condensate pump of the condenser is set, the actual condensate pump outlet flow rate and the set flow rate are judged, and the flow rate of the first desalted water pump is adjusted according to the deviation value so that the condensate pump can maintain the set flow rate operation.

[0019] As a preferred solution of the condenser anti-corrosion method for a heating unit described in the present invention, the initial flow rate of the dosing pump is set according to the flow rate of the first desalted water pump, and then it is determined whether the data of the conductivity and the first corrosion product monitor meet the target values, and then the flow rate of the dosing pump is adjusted according to the deviation until the conductivity and corrosion product data meet the target values.

[0020] As a preferred solution of the condenser anti-corrosion method for a heating unit described in the present invention, the following is described, wherein: first, the size of the data of the second corrosion product monitor and the set value are determined, and the target value of the dissolved oxygen meter is set; then, the target value is compared with the actual value of the dissolved oxygen meter; and the flow rate of the second desalted water pump is adjusted according to the comparison results until the monitoring data of the dissolved oxygen meter reaches the target value.

[0021] The beneficial effects of the condenser anti-corrosion method of the heating unit described in the present invention are as follows: (1) The present invention can inhibit the corrosion of the condenser of the heating unit by increasing the pH of the make-up water.

[0022] (2) The present invention can inhibit corrosion of the low-pressure hydrophobic module by adding oxygen to the low-pressure hydrophobic module.

[0023] (3) The present invention uses desalted water to add oxygen to the low-pressure hydrophobic module, and utilizes the high content of oxygen in the desalted water, so there is no need to provide a separate oxygen source, and the control method is simple and stable.

[0024] (4) The present invention reduces the corrosion products introduced into the condenser by adding oxygen through the low-pressure drain module, and inhibits the corrosion of the condenser by increasing the pH value of the make-up water. The ingenious combination of these two operating modes can effectively reduce the iron pollution of the fine treatment and extend the operating life of the pre-filter and the mixed bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 The figure is an overall schematic diagram of a condenser anti-corrosion system for a heating unit.

[0027] Figure 2 The present invention is a flow chart of a water replenishment module of a condenser anti-corrosion method for a heating unit.

[0028] Figure 3 The present invention is a flow chart of a low-pressure heater drain module for a method for anti-corrosion of a condenser of a heating unit. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figure 1 , which is the first embodiment of the present invention, and provides a condenser anti-corrosion system for a heating unit, including a main module 100, a water replenishment module 200, and a low-pressure heater drain module 300. The main module 100 is mainly a low-pressure cylinder 101 and a condenser 102 for processing exhaust steam from the low-pressure cylinder 101. The water replenishment module 200 is mainly used to inject a mixed solution into the condenser 102 to maintain the conductivity of condensed water. The low-pressure heater drain module 300 is mainly used to control the oxygenation and corrosion of the low-pressure heater drain. The water replenishment module 200 and the low-pressure heater drain module 300 work together to control the pH value and corrosion in the condenser 102.

[0034] Specifically, the main module 100 includes a condenser 102 and a condensate pump 103 disposed at the outlet of the condenser 102, a fine treatment 104 connected to the outlet of the condensate pump 103, the fine treatment 104 is connected to a low-pressure heater 105, and a sampling tube is also provided at the outlet of the condensate pump 103, and a conductivity meter 106 and a first corrosion product monitor 107 are provided on the sampling tube. The steam from the medium-pressure cylinder is connected to the inlet of the low-pressure cylinder 101, and the outlet of the low-pressure cylinder 101 is connected to the inlet of the condenser 102, and the outlet of the condenser 102 is connected to the inlet of the condensate pump 103, and the outlet of the condensate pump 103 is connected to the fine treatment 104, and the fine treatment 104 is composed of a pre-filter and The mixed bed is used to purify condensate. The fine treatment 104 is connected to the water side inlet of the low-pressure heater 105. The water side outlet of the low-pressure heater 105 is connected to the deaerator. The conductivity meter 106 is located on the sampling tube at the outlet of the condensate pump 103. The first corrosion product monitor 107 is located on the sampling tube at the outlet of the condensate pump 103. The low-pressure cylinder extracts part of the steam and enters the steam side of the low-pressure heater to heat the water side of the low-pressure heater. The steam temperature is reduced and becomes water, which is called low-pressure heater drain. The low-pressure heater drain enters the condenser. The water on the water side of the low-pressure heater is heated by steam and the temperature is increased, and enters the subsequent treatment (such as deaerator, economizer, high-pressure heater, etc.);

[0035] The water replenishment module 200 includes a pipeline mixer 202 connected to the inlet of the condenser 102, a first desalted water pump 201 connected to the inlet of the pipeline mixer 202, a dosing pump 203 connected to the inlet of the pipeline mixer 202, water from the desalted water tank is connected to the inlet of the first desalted water pump 201, the outlet of the first desalted water pump 201 is connected to the inlet of the pipeline mixer 202, the outlet of the pipeline mixer 202 is connected to the inlet of the condenser 102, the ammonia solution from the ammonia addition room is connected to the inlet of the dosing pump 203, and the outlet of the dosing pump 203 is connected to the inlet of the pipeline mixer 202;

[0036] The low-pressure heater drain module 300 includes a second desalted water pump 301 connected to the steam side inlet of the low-pressure heater 105, a low-pressure heater drain pump 302 connected to the steam side outlet of the low-pressure heater 105, a sampling tube is also provided at the outlet of the low-pressure heater drain pump 302, a dissolved oxygen meter 303 and a second corrosion product monitor 304 are arranged on the sampling tube, water from the desalted water tank is connected to the inlet of the second desalted water pump 301, the outlet of the second desalted water pump 301 is connected to the steam side inlet of the low-pressure heater 105, the steam side outlet of the low-pressure heater 105 is connected to the inlet of the low-pressure heater drain pump 302, the outlet of the low-pressure heater drain pump 302 is connected to the inlet of the condenser 102, the dissolved oxygen meter 303 is located on the sampling tube at the outlet of the low-pressure heater drain pump 302, and the second corrosion product monitor 304 is located on the sampling tube at the outlet of the low-pressure heater drain pump 302.

[0037] Furthermore, the condensate pump 103 is interlocked with the first desalted water pump 201, and the flow of the first desalted water pump 201 is controlled according to the target flow of the condensate pump 103. The second desalted water pump 301 is interlocked with the low-pressure drain pump 302 and adjusted according to the feedback of the dissolved oxygen meter 303 and the second corrosion product monitor 304.

[0038] Specific implementation process: When oxygen is added to the low-pressure drain module and water replenishment does not increase the pH value, the second desalted water pump 301 is turned on, and the iron content monitored by the second corrosion product monitor 304 is less than 3μg / L. The oxygenation of the low-pressure drain module inhibits corrosion, and the corrosion products brought into the condenser 102 are less iron; the dosing pump 203 is turned off, and the water replenishment enters the condenser 102, resulting in the condensate pH in the condenser 102 being around 8.5, and the condenser 102 is corroded. The first corrosion product monitor 107 shows that the iron content of the corrosion products is greater than 3μg / L, and no anti-corrosion is performed at this time.

[0039] When oxygen is not added to the low-pressure drain module and water is added to increase the pH value. When the second desalted water pump 301 is turned off, the iron content monitored by the second corrosion product monitor 304 is greater than 3μg / L, and the corrosion products brought into the condenser 102 are more iron; after the dosing pump 203 is turned on and water is added to the condenser 102, the conductivity meter 106 displays a value of 4.3-10.7μS / cm, and the pH of the condensate is maintained at 9.2-9.6. The condenser 102 is not corroded, but the iron substituted into the condenser 102 by the low-pressure drain module is high, and the iron content of the corrosion products of the first corrosion product monitor 107 is greater than 3μg / L, and no anti-corrosion is performed at this time.

[0040] When oxygen is added to the low-pressure drain module and water is added to increase the pH value. The second desalted water pump 301 is turned on, and the iron content monitored by the second corrosion product monitor 304 is less than 3μg / L. The oxygenation of the low-pressure drain module inhibits corrosion, and the corrosion products brought into the condenser 102 are less iron; after the dosing pump 203 is turned on and water is added to the condenser 102, the conductivity meter 106 displays a value of 4.3-10.7μS / cm, and the pH of the condensate is maintained at 9.2-9.6. The condenser 102 is not corroded. On the one hand, the corrosion products of the low-pressure drain module that are introduced into the condenser 102 are less iron, and on the other hand, the condenser 102 itself is not corroded. Therefore, the iron content of the corrosion products of the first corrosion product monitor 107 is less than 3μg / L, which is at a relatively low level, and anti-corrosion is performed at this time.

[0041] Example 2

[0042] Reference Figure 2 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a method for anti-corrosion of a condenser of a heating unit, which is used in the above-mentioned anti-corrosion system of a condenser of a heating unit, and further includes the following steps:

[0043] S1, monitoring the data of the condenser 102 and the low-pressure heater 105 drainage through instruments;

[0044] S2, adjust the system flow according to the instrument data and adjust various data to the target value;

[0045] S3, when all values ​​are adjusted to meet the standards, maintain stable operation.

[0046] Further, S2.1, the water supply from the water supply module 200 to the condenser 102 is adjusted according to the instrument data to adjust the conductivity and the content of corrosion products.

[0047] Specifically, in S2.1, the water from the desalted water tank and the ammonia solution from the ammonia addition chamber are mixed, and the flow rate of the dosing pump 203 is adjusted according to the conductivity and corrosion product data monitored by the conductivity meter 106 and the first corrosion product monitor 107.

[0048] Furthermore, before mixing the ammonia solution from the desalted water tank and the ammonia addition room, the flow rate of the condensate pump 103 of the condenser 102 is set, the actual water outlet flow rate of the condensate pump 103 and the set flow rate are judged, and the flow rate of the first desalted water pump 201 is adjusted according to the deviation value so that the condensate pump 103 can maintain the set flow rate.

[0049] Furthermore, the initial flow rate of the dosing pump 203 is set according to the flow rate of the first desalted water pump 201, and then it is determined whether the data of the conductivity and the first corrosion product monitor 107 meet the target values, and the flow rate of the dosing pump 203 is adjusted according to the deviation until the conductivity and corrosion product data meet the target values.

[0050] Specific implementation process: the set flow of the condensate pump 103 changes according to the unit load. If the displayed flow of the condensate pump 103 is less than the set flow of the condensate pump 103, the flow of the first desalted water pump 201 is increased until the displayed flow of the condensate pump 103 is equal to the set flow of the condensate pump 103, and the first desalted water pump 201 maintains the current flow rate; if the displayed flow of the condensate pump 103 is greater than the set flow of the condensate pump 103, the flow of the first desalted water pump 201 is reduced until the displayed flow of the condensate pump 103 is equal to the set flow of the condensate pump 103, and the first desalted water pump 201 maintains the current flow rate. After the water from the desalted water pump 201 and the ammonia solution from the ammonia adding room are fully mixed in the pipeline mixer 202, they are added to the condenser 102 of the main module 100. The first desalted water pump 201 is interlocked with the dosing pump 203, and feedback adjustment is performed based on the conductivity meter 106 and the first corrosion product monitor 107 to ensure that the conductivity meter 106 at the outlet of the condensate pump 103 maintains the target value of 4.3~10.7μS / cm.

[0051] According to the flow rate of the first desalted water pump 201, an initial flow rate is given to the dosing pump 203. If the conductivity displayed by the conductivity meter 106 is less than 4.3 μS / cm, the first corrosion product monitor 107 is less than 3 μg / L, and the flow rate of the dosing pump 203 is increased until the conductivity displayed by the conductivity meter 106 is within the target value of 4.3 to 10.7 μS / cm; if the conductivity displayed by the conductivity meter 106 is less than 4.3 μS / cm, the first corrosion product monitor 107 is greater than 3 μg / L, and the flow rate of the dosing pump 203 is increased until the conductivity displayed by the conductivity meter 106 is within the target value of 4.3 to 10.7 μS / cm; If the conductivity displayed by the conductivity meter 106 is greater than 10.7μS / cm, the first corrosion product monitor 107 is less than 3μg / L, and the flow rate of the dosing pump 203 is reduced until the conductivity displayed by the conductivity meter 106 is at the target value; if the conductivity displayed by the conductivity meter 106 is greater than 10.7μS / cm, the first corrosion product monitor 107 is greater than 3μg / L, and the condensate sampling tube is automatically drained until the first corrosion product monitor 107 is less than 3μg / L and the drainage is stopped, and the flow rate of the dosing pump 203 is reduced until the conductivity displayed by the conductivity meter 106 is at the target value of 4.3~10.7μS / cm.

[0052] Example 3

[0053] Reference Figure 3 , which is the third embodiment of the present invention, and is different from the above embodiments in that, S2.2, the flow rate of the second desalted water pump 301 in the low-pressure drain module 300 is adjusted according to the instrument data to adjust the dissolved oxygen value and the content of corrosive substances in the low-pressure drain;

[0054] Part of the steam is extracted from the low-pressure cylinder and heated through the steam side of the low-pressure heater to heat the water on the water side of the low-pressure heater. After the steam heat exchange, the temperature is reduced and becomes low-pressure heater drain. The low-pressure heater drain enters the condenser. In the water-steam cycle, part of the water in the condenser returns to the condenser (a small amount), and a large amount of make-up water is replenished to the condenser through the desalted water tank. The low-pressure heater drain and desalted water are two different water paths.

[0055] Specifically, in S2.2, according to the data monitored by the second corrosion product monitor 304 and the dissolved oxygen meter 303, the water from the desalted water tank is input into the condenser 102 through the second desalted water pump 301 and the flow rate is adjusted.

[0056] Furthermore, first determine the size of the data of the second corrosion product monitor 304 and the set value, set the target value of the dissolved oxygen meter 303, and then compare the target value with the actual value of the dissolved oxygen meter 303, and adjust the flow of the second desalted water pump 301 according to the comparison until the monitoring data of the dissolved oxygen meter 303 reaches the target value.

[0057] Specific implementation process: When the second corrosion product monitor 304 displays a value greater than 3μg / L, the target value of the dissolved oxygen meter 303 is set to 80-120μg / L, and the second desalted water pump 301 automatically sets the corresponding flow rate according to the 8-segment interval of the flow rate of the low-pressure drain pump 302. After waiting for 5 minutes to stabilize, if the dissolved oxygen value displayed by the dissolved oxygen meter 303 is less than 80μg / L, the second desalted water pump 301 slowly increases the flow rate until the dissolved oxygen meter 303 displays 80-120μg / L, and the second desalted water pump 301 maintains the current flow rate and operates stably; if the dissolved oxygen value displayed by the dissolved oxygen meter 303 is greater than 120μg / L, the second desalted water pump 301 slowly reduces the flow rate until the dissolved oxygen meter 303 displays 80-120μg / L, and the second desalted water pump 301 maintains the current flow rate and operates stably.

[0058] When the second corrosion product monitor 304 displays a value less than 3 μg / L, the target value of the dissolved oxygen meter 303 is set at 20 to 70 μg / L, and the second desalted water pump 301 automatically sets the corresponding flow rate according to the 8-segment area of ​​the flow rate of the low-pressure drain pump 302. After waiting for 5 minutes to stabilize, if the dissolved oxygen value displayed by the dissolved oxygen meter 303 is less than 20 μg / L, the second desalted water pump 301 slowly increases the flow rate until the dissolved oxygen meter 303 displays 20 to 70 μg / L, and the second desalted water pump 301 maintains the current flow rate and operates stably; if the dissolved oxygen value displayed by the dissolved oxygen meter 303 is greater than 70 μg / L, the second desalted water pump 301 slowly reduces the flow rate until the dissolved oxygen meter 303 displays 20 to 70 μg / L, and the second desalted water pump 301 maintains the current flow rate and operates stably.

[0059] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A condenser anti-corrosion system for a heating unit, characterized in that: include, A main module (100), a water replenishment module (200), and a low-pressure drain module (300); The main module (100) comprises a condenser (102) and a condensate pump (103) arranged at the outlet of the condenser (102), a polishing treatment (104) connected to the outlet of the condensate pump (103), the polishing treatment (104) being connected to a low-pressure heater (105), and a sampling tube being arranged at the outlet of the condensate pump (103), and a conductivity meter (106) and a first corrosion product monitor (107) being arranged on the sampling tube; The water replenishment module (200) comprises a pipeline mixer (202) connected to the inlet of the condenser (102), a first desalted water pump (201) connected to the inlet of the pipeline mixer (202), and a dosing pump (203) connected to the inlet of the pipeline mixer (202); The low-pressure heater drain module (300) comprises a second desalted water pump (301) connected to the steam side inlet of the low-pressure heater (105), and a low-pressure heater drain pump (302) connected to the steam side outlet of the low-pressure heater (105). The outlet of the low-pressure heater drain pump (302) is also provided with a sampling tube, and a dissolved oxygen meter (303) and a second corrosion product monitor (304) are arranged on the sampling tube.

2. The condenser anti-corrosion system for a heating unit according to claim 1, characterized in that: The main module (100) further comprises a low-pressure cylinder (101), the exhaust side of the low-pressure cylinder (101) is connected to the inlet of the condenser (102), and the low-pressure cylinder (101) is also provided with a pipeline to merge with the second desalted water pump (301).

3. The condenser anti-corrosion system for a heating unit according to claim 2, characterized in that: The condensate pump (103) is interlocked with the first desalted water pump (201), and the flow rate of the first desalted water pump (201) is controlled according to the target flow rate of the condensate pump (103). The second desalted water pump (301) is interlocked with the low-pressure drain pump (302), and is adjusted according to the feedback of the dissolved oxygen meter (303) and the second corrosion product monitor (304).

4. A method for anti-corrosion of a condenser of a heating unit, used in the anti-corrosion system of a condenser of a heating unit according to any one of claims 1 to 3, characterized in that: The following steps are also included: S1, monitoring the data of the condenser (102) and the low pressure heater (105) drainage through instruments; S2, adjust the system flow according to the instrument data and adjust various data to the target value; S3, when all values ​​are adjusted to meet the standards, maintain stable operation.

5. The method for anti-corrosion of a condenser of a heating unit according to claim 4, characterized in that: S2 also includes, S2.1, adjusting the water supply from the water supply module (200) to the condenser (102) according to the instrument data, and adjusting the conductivity and the content of corrosion products; S2.2, adjusting the flow rate of the second desalted water pump (301) in the low-pressure drain module (300) according to the instrument data, and adjusting the dissolved oxygen value and the corrosion product content of the low-pressure drain module (300).

6. The method for anticorrosion of a condenser of a heating unit according to claim 5, characterized in that: In S2.1, water from the desalted water tank and ammonia solution from the ammonia addition chamber are mixed, and the flow rate of the dosing pump (203) is adjusted according to the conductivity and corrosion product data monitored by the conductivity meter (106) and the first corrosion product monitor (107).

7. The method for anticorrosion of a condenser of a heating unit according to claim 5 or 6, characterized in that: In S2.2, based on the data monitored by the second corrosion product monitor (304) and the dissolved oxygen meter (303), the water from the desalted water tank is input into the condenser (102) through the second desalted water pump (301) and the flow rate is adjusted.

8. The method for anticorrosion of a condenser of a heating unit according to claim 6, characterized in that: Before mixing the desalted water from the desalted water tank and the ammonia solution from the ammonia adding room, the flow rate of the condensate pump (103) of the condenser (102) is set, the difference between the actual water flow rate of the condensate pump (103) and the set flow rate is determined, and the flow rate of the first desalted water pump (201) is adjusted according to the deviation value so that the condensate pump (103) can maintain the set flow rate.

9. The method for anticorrosion of a condenser of a heating unit according to claim 8, characterized in that: The initial flow rate of the dosing pump (203) is set according to the flow rate of the first desalted water pump (201), and then it is determined whether the data of the conductivity and the first corrosion product monitor (107) meet the target values, and the flow rate of the dosing pump (203) is adjusted according to the deviation until the conductivity and corrosion product data meet the target values.

10. The method for anti-corrosion of a condenser of a heating unit according to claim 9, characterized in that: First, determine the size of the data of the second corrosion product monitor (304) and the set value, set the target value of the dissolved oxygen meter (303) and the second corrosion product monitor (304), then compare the target value with the actual value of the dissolved oxygen meter (303) and the corrosion product monitor (304), and adjust the flow rate of the second desalted water pump (301) according to the comparison until the monitoring data of the dissolved oxygen meter (303) and the second corrosion product monitor (304) reach the target value.

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