Bypass operation method and system for condensed water polishing system

Abstract

The present application discloses a bypass operation method and system for a condensed water polishing system. The system comprises a pre-filter and a mixed bed. The bypass of the pre-filter is divided into three paths, and the bypass of the mixed bed is divided into three paths. In this method, a small-pipe-diameter bypass is added on the basis of an original polishing bypass, so that the bypass can allow for 20%-30% of flow to pass through. This method solves the problem of interruption of a condensed water polishing flow caused by faults or jamming in an electric bypass and the problem that a bypass valve cannot be finely regulated and a polishing device has significant flow fluctuations during unit peak load adjustment. The bypass flow can be accurately adjusted, interruption is avoided, water supply and dosing adjustment is smooth, and the impact of flow fluctuations on the polishing device is reduced.

Description

A condensate polishing system bypass operation method and system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 13, 2023, with application number 202311713815.X and invention name “A Bypass Operation Method and System for Condensate Polishing System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to condensate polishing equipment for a thermal power plant, and in particular to a bypass operation method and system for a condensate polishing system. Background Art

[0004] The primary function of condensate polishing is to remove impurities introduced by condenser leakage, system corrosion products, and impurities introduced by boiler feed water, thereby ensuring acceptable boiler feedwater quality. The proper operation of the polishing system is crucial for ensuring unit steam quality, mitigating corrosion and deposition on thermal equipment, shortening unit startup time, and improving unit operating economy. Both subcritical and supercritical units are designed with condensate polishing systems, whose primary components include a prefilter and a mixed bed. Both the prefilter and the mixed bed are equipped with a bypass system. In earlier designs, a single large bypass system was incorporated into the entire polishing system. Currently, a dual bypass system, consisting of both the prefilter and the mixed bed, is the most common design.

[0005] The existing fine treatment bypass system operates with a normally closed manual butterfly valve on one side and a controlled-open electric butterfly valve on the other. Two normally open manual butterfly valves are placed before and after the electric butterfly valve. The bypass valve for 300WM-class units is DN300-DN350mm, while the bypass valve for 600WM-class units is DN400-DN500mm. The bypass valve for 1000WM-class units is even larger. The electric bypass valve offers full flow adjustment from 0-100% or three-point adjustment from 0-50% to 100%. The 0-50%-100% mode makes fine bypass adjustment difficult.

[0006] In recent years, power plants have experienced a series of cases where polishing equipment has been shut down. Due to malfunctions or jams in the electric bypass, the system failed to open properly. Without timely opening of the manual bypass valve, condensate polishing flow was interrupted, leading to unexpected unit shutdowns. Furthermore, with the rapid development of renewable energy, thermal power units are generally operating at peak loads. During peak load periods, rapid load ramping can cause rapid increases or decreases in flow. This flow rate fluctuation impacts the regulation of feedwater ammonia addition, resulting in delayed ammonia addition control and potentially damaging polishing equipment. Currently, power plants can reduce the amount of water treated by polishing equipment by controlling the opening of the electric bypass valve, diverting some condensate through the bypass. However, the risk of condensate interruption due to the electric bypass valve malfunctioning during opening remains. Furthermore, the large size of the butterfly valve makes it difficult to adjust the bypass flow rate, which inconveniences the operation and operation of the polishing equipment.

[0007] Summary of the Invention

[0008] To address the problems existing in the prior art, this application provides a bypass operation method and system for a condensate polishing system. The polishing bypass maintains a fixed flow rate of 20% to 30%, resolving issues such as condensate polishing flow interruptions caused by malfunction or jamming of the electric bypass, the inability to finely adjust the bypass gate, and the large flow fluctuations in the polishing equipment during peak load regulation. This method enables precise and uninterrupted bypass flow regulation, smooth water dosing, and reduces the impact of flow fluctuations on the polishing equipment.

[0009] This application is achieved through the following technical solutions:

[0010] A bypass operation method for a condensate polishing system, comprising:

[0011] When the condensate polishing system is in operation, the fourth manual valve and the eighth manual valve are in the open state, and there is 20% to 30% flow of condensate, the first manual butterfly valve, the second manual butterfly valve, the fifth manual butterfly valve, and the sixth manual butterfly valve are in the open state; the first electric butterfly valve, the third manual butterfly valve, the second electric butterfly valve, and the seventh manual butterfly valve are in the closed state;

[0012] When the condensate polishing system is shut down or the unit is started and flushed, the third and seventh manual butterfly valves are closed, and the remaining valves are open.

[0013] When the pre-filter is backwashed or shut down, open the first electric butterfly valve to allow 50% or 100% flow to pass through the entire bypass, and the status of other valves remains the same as when the condensate polishing system is in operation;

[0014] When the mixed bed is regenerated or exiting operation, the second electric butterfly valve is opened to allow 50% or 100% flow to pass through the entire bypass, and the status of other valves remains consistent with the operation of the condensate polishing system;

[0015] When the condensate quality is unqualified due to condenser leakage or poor return water quality, the fourth manual valve, the eighth manual valve, the first electric butterfly valve, the third manual butterfly valve, the second electric butterfly valve and the seventh manual butterfly valve are in the closed state, and the remaining valves are in the open state, and the condensate polishing system operates at full flow.

[0016] Optionally, when the first electric butterfly valve is under maintenance or in a faulty state, the third manual butterfly valve is opened when the bypass is opened, and the fourth manual valve is in an open state.

[0017] Optionally, when the second electric butterfly valve is under maintenance or in a faulty state, the seventh manual butterfly valve is opened when the bypass is opened, and the eighth manual valve is in an open state.

[0018] Optionally, the control flow sizes of the first manual butterfly valve, the first electric butterfly valve, the second manual butterfly valve, the third manual butterfly valve, the fifth manual butterfly valve, the second electric butterfly valve, the sixth manual butterfly valve, and the seventh manual butterfly valve correspond to 100% of the condensate polishing flow.

[0019] Optionally, the control flow rates of the fourth manual valve and the eighth manual valve correspond to 20% to 30% of the condensate polishing flow rate.

[0020] A condensate polishing system bypass operation system, comprising:

[0021] The bypass of the pre-filter is divided into three routes, wherein the first route is provided with a first manual butterfly valve, a first electric butterfly valve and a second manual butterfly valve, the second route is provided with a third manual butterfly valve, and the third route is provided with a fourth manual valve, and the first, second and third routes are arranged in parallel, and after being aggregated, one end is connected to the condensate polishing treatment water main pipe, and the other end is connected to the mixed bed water main pipe;

[0022] The bypass of the mixed bed is divided into three routes, among which, the fifth manual butterfly valve, the second electric butterfly valve and the sixth manual butterfly valve are provided on the first route, the seventh manual butterfly valve is provided on the second route, and the eighth manual valve is provided on the third route. The first, second and third routes are arranged in parallel, and after being aggregated, one end is connected to the mixed bed water inlet main pipe, and the other end is connected to the condensate polishing treatment water outlet main pipe.

[0023] Optionally, the pre-filter is connected to the condensate polishing inlet pipe through a first inlet valve.

[0024] Optionally, the pre-filter is connected to the mixed bed water inlet main pipe through a first outlet valve.

[0025] Optionally, the mixed bed is connected to the mixed bed water inlet main pipe through a second inlet valve.

[0026] Optionally, the mixed bed is connected to the condensate polishing outlet main pipe through a second outlet valve.

[0027] Compared with the existing technology, this application has the following beneficial technical effects:

[0028] The present application provides a bypass operation method and system for a condensate polishing system, which includes a pre-filter and a mixed bed; the bypass of the pre-filter is divided into three routes, one of which is a manual butterfly valve, an electric butterfly valve, and a manual butterfly valve connected to the condensate polishing water main pipe and the mixed bed inlet water main pipe, corresponding to 100% of the condensate polishing flow; one of which is a manual butterfly valve connected to the condensate polishing water main pipe and the mixed bed inlet water main pipe, corresponding to 100% of the condensate polishing flow; and one of which is a manual valve connected to the condensate polishing water main pipe and the mixed bed inlet water main pipe. The bypass of the mixed bed is divided into three routes, one of which is a manual butterfly valve, an electric butterfly valve, and a manual butterfly valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 100% of the condensate polishing flow; one of which is a manual butterfly valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 100% of the condensate polishing flow; and one of which is a manual valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 20% to 30% of the condensate polishing flow. This application adds a small-diameter bypass on the basis of the original polishing bypass, so that the bypass can pass 20% to 30% of the flow. This method solves the problem of condensate polishing flow interruption due to failure or jamming of the electric bypass, and solves the problem that the bypass door cannot be finely adjusted and the flow of the polishing equipment fluctuates greatly during the peak regulation period of the unit. This technology allows for precise, uninterrupted bypass flow regulation, smooth water dosing, and reduced impact of flow fluctuations on the fine treatment equipment. This technology demonstrates that the fine treatment bypass maintains a fixed flow rate of 20% to 30%, with normal opening and regulation of the bypass achieved through an electric bypass gate. This eliminates interruptions in fine treatment flow and prevents downtime due to flow interruptions. The bypass is equipped with both electric and manual valves, allowing for time to open the manual bypass in the event of an electric bypass valve failure.

[0029] The bypass operation system of the condensate polishing system of the present application reduces fluctuations in polishing flow during peak operation of the unit, reducing the impact on the polishing equipment. The condensate passing through the bypass does not require ammonia addition to increase pH, which can increase the smoothness of dosing when the flow fluctuates greatly.

[0030] When the unit is shut down abnormally, the bypass has a 20% to 30% opening, which will not cause a large pressure loss at the inlet of the fine treatment equipment, thereby reducing the risk of resin backflow into the inlet pipeline.

[0031] During the operation of the unit, when the bypass flow is 20% to 30%, there is no need to open the electric bypass door for adjustment.

[0032] Furthermore, the method is applicable to all condensate polishing systems.

[0033] Furthermore, this method only requires adding a small-diameter bypass and a valve on the basis of the original bypass, and the modification workload is small.

[0034] Furthermore, the implementation process is simple, the application effect is good, and it is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic diagram of a bypass operation method of a condensate polishing system;

[0036] In the figure: pre-filter 1, pre-filter 2, 2, mixed bed 1, 3, mixed bed 2, 4, mixed bed 3, 5, first inlet valve 6, first outlet valve 7, second inlet valve 8, second outlet valve 9, first manual butterfly valve 10, first electric butterfly valve 11, second manual butterfly valve 12, third manual butterfly valve 13, fourth manual valve 14, fifth manual butterfly valve 15, second electric butterfly valve 16, sixth manual butterfly valve 17, seventh manual butterfly valve 18, eighth manual valve 19. DETAILED DESCRIPTION

[0037] The present application will be further described in detail below with reference to specific embodiments, which are intended to explain rather than limit the present application.

[0038] In order to enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0039] To overcome the aforementioned problems of the prior art, the present application aims to provide a bypass operation method for a condensate polishing system. The polishing bypass maintains a fixed flow rate of 20% to 30%, resolving issues such as condensate polishing flow interruption caused by malfunction or jamming of the electric bypass, the inability to finely adjust the bypass gate, and the large flow fluctuations in the polishing equipment during unit peak load regulation. This method enables precise and uninterrupted bypass flow regulation, smooth water dosing adjustment, and reduces the impact of flow fluctuations on the polishing equipment.

[0040] A condensate polishing system bypass operation system, as shown in Figure 1, pre-filter, mixed bed; the pre-filter bypass is divided into three ways, one is a manual butterfly valve, an electric butterfly valve, and a manual butterfly valve connected to the condensate polishing water mother pipe and the mixed bed inlet mother pipe, corresponding to 100% of the condensate polishing flow, one is a manual butterfly valve connected to the condensate polishing water mother pipe and the mixed bed inlet mother pipe, corresponding to 100% of the condensate polishing flow, and one is a manual valve connected to the condensate polishing water mother pipe and the mixed bed inlet mother pipe, corresponding to 20% to 30% of the condensate polishing flow rate; the mixed bed bypass is divided into three routes, one is a manual butterfly valve, an electric butterfly valve, and a manual butterfly valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 100% of the condensate polishing flow rate, one is a manual butterfly valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 100% of the condensate polishing flow rate, and one is a manual valve connected to the mixed bed water inlet main pipe and the condensate polishing outlet main pipe, corresponding to 20% to 30% of the condensate polishing flow rate.

[0041] The pre-filter 1 is connected to the condensate polishing water inlet main pipe through the first inlet valve 6, and is connected to the mixed bed water inlet main pipe through the first outlet valve 7. The connection method of the pre-filter 2 is the same as that of the pre-filter 1; the mixed bed 3 is connected to the mixed bed water inlet main pipe through the second inlet valve 8, and is connected to the condensate polishing water outlet main pipe through the second outlet valve 9. The connection method of the mixed bed 2 4 and the mixed bed 3 5 is the same as that of the mixed bed 3; the bypass of the pre-filter 1 and the pre-filter 2 is divided into three routes, one of which is connected to the condensate polishing water inlet main pipe and the mixed bed water inlet main pipe by the first manual butterfly valve 10, the first electric butterfly valve 11, and the second manual butterfly valve 12; the other is connected to the third manual butterfly valve 13 The condensate polishing water inlet main pipe is connected to the mixed bed water inlet main pipe, with a fourth manual valve 14 connecting the condensate polishing water inlet main pipe and the mixed bed water inlet main pipe. The bypass for mixed beds 1 (3), 2 (4), and 3 (5) is divided into three routes: a fifth manual butterfly valve 15, a second electric butterfly valve 16, and a sixth manual butterfly valve 17 connecting the mixed bed water inlet main pipe and the condensate polishing water outlet main pipe; a seventh manual butterfly valve 18 connecting the mixed bed water inlet main pipe and the condensate polishing water outlet main pipe; and an eighth manual valve 19 connecting the mixed bed water inlet main pipe and the condensate polishing water outlet main pipe. A small-diameter bypass is added to the existing polishing bypass, allowing the bypass to pass 20% to 30% of the flow. This technology demonstrates that the polishing bypass maintains a fixed flow of 20% to 30%, and the bypass is normally opened and regulated by an electric bypass door, preventing polishing flow interruptions or downtime caused by flow interruptions. When the electric bypass door is abnormal, it has time to open the manual bypass.

[0042] The sizes of the first manual butterfly valve 10, the first electric butterfly valve 11, the second manual butterfly valve 12, the third manual butterfly valve 13, the fifth manual butterfly valve 15, the second electric butterfly valve 16, the sixth manual butterfly valve 17, and the seventh manual butterfly valve 18 correspond to 100% of the condensate polishing flow rate; the sizes of the fourth manual valve 14 and the eighth manual valve 19 correspond to 20% to 30% of the condensate polishing flow rate;

[0043] A bypass operation method for a condensate polishing system:

[0044] When the condensate polishing system is in operation, the fourth manual valve 14 and the eighth manual valve 19 are in the open state, 20% to 30% of the condensate passes through the fourth manual valve 14 and the eighth manual valve 19, the first manual butterfly valve 10, the second manual butterfly valve 12, the fifth manual butterfly valve 15, and the sixth manual butterfly valve 17 are in the open state, and the first electric butterfly valve 11, the third manual butterfly valve 13, the second electric butterfly valve 16, and the seventh manual butterfly valve 18 are in the closed state;

[0045] When the condensate polishing system is shut down and during the unit startup and flushing phase, the fourth manual valve 14 and the eighth manual valve 19 are in the open state, the first manual butterfly valve 10, the first electric butterfly valve 11, the second manual butterfly valve 12, the fifth manual butterfly valve 15, the second electric butterfly valve 16, and the sixth manual butterfly valve 17 are in the open state, and the third manual butterfly valve 13 and the seventh manual butterfly valve 18 are in the closed state;

[0046] When the pre-filter 1 and pre-filter 2 are backwashed and exiting operation, the first electric butterfly valve 11 is opened according to the number of exiting devices, so that the entire bypass passes 50% or 100% of the flow, and the status of other valves remains the same as when the condensate polishing system is in operation;

[0047] When mixed bed 1 3, mixed bed 2 4, and mixed bed 3 5 are regenerated and exited, the second electric butterfly valve 16 is opened according to the number of exiting equipment to allow 50% or 100% flow to pass through the entire bypass. The status of other valves remains the same as when the condensate polishing system is in operation;

[0048] During peak-shaving operation, the unit reduces fluctuations in fine treatment flow and minimizes impact on fine treatment equipment. Condensate passing through the bypass does not require ammonia addition to raise pH, which increases the smoothness of dosing when flow fluctuates significantly.

[0049] When the unit is shut down abnormally, the bypass has a 20% to 30% opening, which will not cause a large pressure loss at the inlet of the fine treatment equipment, thereby reducing the risk of resin backflow into the inlet pipeline.

[0050] During the operation of the unit, when the bypass flow is 20% to 30%, there is no need to open the electric bypass door for adjustment.

[0051] When the first electric butterfly valve 11 needs to be bypassed due to maintenance or failure, the third manual butterfly valve 13 is opened and the fourth manual valve 14 is in the open state;

[0052] When the second electric butterfly valve 16 needs to be bypassed due to maintenance or failure, the seventh manual butterfly valve 18 is opened and the eighth manual valve (19) is in the open state;

[0053] When the condensate quality is unqualified due to condenser leakage or poor return water quality, the fourth manual valve 14 and the eighth manual valve 19 are closed, the first manual butterfly valve 10, the second manual butterfly valve 12, the fifth manual butterfly valve 15, and the sixth manual butterfly valve 17 are in the open state, the first electric butterfly valve 11, the third manual butterfly valve 13, the second electric butterfly valve 16, and the seventh manual butterfly valve 18 are in the closed state, and the condensate polishing system is in full flow operation.

[0054] The fourth manual valve 14 and the eighth manual valve 19 can adjust the flow rate according to operation needs.

[0055] The fourth manual valve 14 and the eighth manual valve 19 can be ball valves or butterfly valves;

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] The above description is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Any ordinary technician in this industry can smoothly implement the present application as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present application using the technical content disclosed above are all equivalent embodiments of the present application. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present application are still within the scope of protection of the technical solution of the present application.

Claims

1. A condensate polishing system bypass operation system, characterized in that: Including, pre-filter and mixed bed; The bypass of the pre-filter is divided into three paths, wherein one path is provided with a first manual butterfly valve (10), a first electric butterfly valve (11) and a second manual butterfly valve (12), the second path is provided with a third manual butterfly valve (13), and the third path is provided with a fourth manual valve (14), and the one path, the second path and the third path are arranged in parallel, and after being aggregated, one end is connected to the condensate polishing treatment water inlet main pipe, and the other end is connected to the mixed bed water inlet main pipe; The bypass of the mixed bed is divided into three routes, wherein one route is provided with a fifth manual butterfly valve (15), a second electric butterfly valve (16) and a sixth manual butterfly valve (17), the second route is provided with a seventh manual butterfly valve (18), and the third route is provided with an eighth manual valve (19). The first route, the second route and the third route are arranged in parallel, and after being combined, one end is connected to the mixed bed water inlet main pipe, and the other end is connected to the condensate polishing water outlet main pipe.

2. A condensate polishing system bypass operation system according to claim 1, characterized in that: The pre-filter is connected to the condensate polishing treatment water inlet pipe via a first inlet valve (6).

3. A condensate polishing system bypass operation system according to claim 1, characterized in that: The pre-filter is connected to the mixed bed water inlet main pipe via a first outlet valve (7).

4. A condensate polishing system bypass operation system according to claim 1, characterized in that: The mixed bed is connected to the mixed bed water inlet main pipe via a second inlet valve (8).

5. The bypass operation system of a condensate polishing system according to claim 1, characterized in that: The mixed bed is connected to the condensate polishing outlet pipe via a second outlet valve (9).

6. A condensate polishing system bypass operation method, based on the condensate polishing system bypass operation system according to any one of claims 1 to 5, characterized in that: include, When the condensate polishing system is in operation, the fourth manual valve (14) and the eighth manual valve (19) are in an open state, and there is 20% to 30% of the condensate flow, the first manual butterfly valve (10), the second manual butterfly valve (12), the fifth manual butterfly valve (15), and the sixth manual butterfly valve (17) are in an open state; the first electric butterfly valve (11), the third manual butterfly valve (13), the second electric butterfly valve (16), and the seventh manual butterfly valve (18) are in a closed state; When the condensate polishing system is shut down or the unit is started up and flushed, the third manual butterfly valve (13) and the seventh manual butterfly valve (18) are in a closed state, and the remaining valves are in an open state; When the pre-filter is backwashed or shut down, the first electric butterfly valve (11) is opened to allow 50% or 100% of the flow to pass through the entire bypass, and the states of other valves are kept consistent with those when the condensate polishing system is in operation; When the mixed bed is regenerated or exits operation, the second electric butterfly valve (16) is opened to allow 50% or 100% of the flow to pass through the entire bypass, and the states of other valves are kept consistent with those when the condensate polishing system is in operation; When the condensate quality is unqualified due to condenser leakage or poor return water quality, the fourth manual valve (14), the eighth manual valve (19), the first electric butterfly valve (11), the third manual butterfly valve (13), the second electric butterfly valve (16) and the seventh manual butterfly valve (18) are in a closed state, and the remaining valves are in an open state, and the condensate polishing system is in full flow operation.

7. A condensate polishing system bypass operation method according to claim 6, characterized in that: When the first electric butterfly valve (11) is under maintenance or in a faulty state, the third manual butterfly valve (13) is opened when the bypass is opened, and the fourth manual valve (14) is in an open state.

8. A bypass operation method for a condensate polishing system according to claim 6, characterized in that: When the second electric butterfly valve (16) is under maintenance or in a faulty state, the seventh manual butterfly valve (18) is opened when the bypass is opened, and the eighth manual valve (19) is in an open state.

9. A condensate polishing system bypass operation method according to claim 6, characterized in that: The control flow rates of the first manual butterfly valve (10), the first electric butterfly valve (11), the second manual butterfly valve (12), the third manual butterfly valve (13), the fifth manual butterfly valve (15), the second electric butterfly valve (16), the sixth manual butterfly valve (17), and the seventh manual butterfly valve (18) correspond to 100% of the condensate polishing flow rate.

10. A condensate polishing system bypass operation method according to claim 6, characterized in that: The control flow rates of the fourth manual valve (14) and the eighth manual valve (19) correspond to 20% to 30% of the condensate polishing flow rate.

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