A high-temperature condensed water iron removal device, an iron removal process and a condensed water treatment system

Abstract

The application provides a high-temperature condensate iron removal device, an iron removal process and a condensate treatment system, the iron removal device comprising a permanent magnet iron removal filter, a filter core type iron removal filter, a bypass pipeline and a water flow switching device; the permanent magnet iron removal filter is connected with a condensate inlet pipeline through a first pipeline, the permanent magnet iron removal filter is connected with the filter core type iron removal filter through a second pipeline, the filter core type iron removal filter is connected with a water outlet pipeline through a third pipeline, the first end of the bypass pipeline is connected with the second pipeline, the second end of the bypass pipeline is connected with the third pipeline, and the water flow switching device is used for switching the filter core type iron removal filter to work or switching the bypass pipeline to work. According to different situations, the permanent magnet iron removal filter or the permanent magnet iron removal filter and the high-temperature-resistant filter core type iron removal filter are selected to remove iron and recycle the high-temperature condensate, the fouling speed of the high-temperature-resistant filter core type iron removal filter is reduced, and the backwashing cycle is prolonged.

Description

Technical Field

[0001] This invention relates to the field of condensate treatment technology, and more specifically, to a high-temperature condensate iron removal device, iron removal process, and condensate treatment system. Background Technology

[0002] The temperature of process condensate in the coal chemical industry is around 100℃, and in some cases even exceeds 160℃. This condensate is characterized by high temperature, high iron content, and low salt content, and has great value for recycling and utilization.

[0003] Currently, most domestic enterprises cool their high-temperature condensate to 40-60℃ and then use traditional low-temperature cartridge-type iron removal filters for iron removal and recovery. This cooling and recovery process increases the investment and operating costs of water treatment equipment and also causes a large amount of circulating cooling water consumption and heat loss. A few enterprises directly discharge this water, resulting in a large waste of water and heat energy and causing heat source pollution. A small number of enterprises choose to use high-temperature resistant cartridge-type iron removal filters for iron removal and recovery under high-temperature conditions. High-temperature resistant cartridges use the microporous deep interception filtration principle. On the one hand, they require a high iron content in the influent and cannot filter condensate with a high iron content. Under normal operating conditions, the iron content in the influent is required to be less than 50μg / L. On the other hand, high-temperature resistant cartridges are easily clogged, resulting in a short service life, with an average service life of only 1-2 years. Moreover, high-temperature resistant cartridges are expensive, and the cost of use and replacement is very high.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The problem solved by this invention is that, in the prior art, using low-temperature filter cartridges for iron removal and recovery increases the investment and operating costs of water treatment equipment, and also causes a large amount of circulating cooling water consumption and heat loss; using high-temperature filter cartridges for iron removal and recovery requires a high iron content in the influent water, and cannot filter condensate with a high iron content. In addition, the service life of high-temperature filter cartridges is short, and the cost of use and replacement is very high.

[0006] To address the aforementioned problems, this invention discloses a high-temperature condensate iron removal device, comprising a permanent magnet iron removal filter, a cartridge iron removal filter, a bypass pipeline, and a water flow switching device. The condensate inlet of the permanent magnet iron removal filter is connected to the condensate supply pipeline via a first pipeline, the condensate outlet of the permanent magnet iron removal filter is connected to the condensate inlet of the cartridge iron removal filter via a second pipeline, the condensate outlet of the cartridge iron removal filter is connected to the outlet pipeline via a third pipeline, the first end of the bypass pipeline is connected to the second pipeline, and the second end of the bypass pipeline is connected to the third pipeline. The water flow switching device is used to switch the cartridge iron removal filter to operation for iron removal, or to bypass the cartridge iron removal filter and put the bypass pipeline into operation.

[0007] This setup allows for the selection of appropriate iron removal device connections based on different condensate conditions, enabling the cartridge-type iron removal filter to be selectively activated. This significantly reduces the filter's operating time. Furthermore, when the cartridge-type iron removal filter is in operation, the condensate entering it has already undergone iron removal treatment by the permanent magnet iron removal filter. This effectively reduces the clogging rate of the cartridge-type iron removal filter, extends the backwashing cycle of the high-temperature filter element, reduces the backwashing frequency, improves its service life, extends the replacement cycle, and lowers the operating cost of the iron removal device.

[0008] The present invention also discloses an iron removal process for use in the high-temperature condensate iron removal device described above, the iron removal process comprising:

[0009] Step S1: Turn on the iron removal device to perform iron removal operation;

[0010] Step S2: Detect the pH value of the high-temperature condensate water and determine whether the pH value meets the first preset condition; when the pH value meets the first preset condition, proceed to step S4; when the pH value does not meet the first preset condition, proceed to step S3.

[0011] Step S3: Detect the iron content in the effluent of the permanent magnet iron removal filter and determine whether the iron content in the effluent meets the second preset condition; when the iron content in the effluent meets the second preset condition, proceed to step S4; when the iron content in the effluent does not meet the second preset condition, proceed to step S5.

[0012] Step S4: Put the cartridge-type iron removal filter into operation for iron removal;

[0013] Step S5: Bypass the cartridge-type iron removal filter, and put the bypass pipeline into operation.

[0014] In this process, the cartridge-type iron removal filter is selectively put into operation for iron removal, and the condensate entering the cartridge-type iron removal filter has already undergone iron removal treatment by the permanent magnet iron removal filter. The iron content in the condensate has been reduced, which can significantly reduce the fouling rate of the high-temperature resistant filter element in the cartridge-type iron removal filter, extend its backwashing or replacement cycle, and significantly reduce the operating cost of the iron removal device.

[0015] Furthermore, the first preset condition is: the pH value of the high-temperature condensate is <8.5, and the second preset condition is: the iron content of the effluent from the permanent magnet iron removal filter is ≥30μg / L.

[0016] When the pH value is < 8.5, it indicates a high iron content in the condensate. A permanent magnet iron separator alone cannot achieve the desired iron removal effect. In this case, a cartridge iron separator needs to be put into operation to perform secondary filtration on the condensate after the permanent magnet iron separator, thereby achieving the desired iron removal effect. When the pH value is ≥ 8.5, it indicates a moderate iron content in the condensate. In this case, a permanent magnet iron separator can potentially complete the iron removal work and achieve the desired iron removal effect. However, after the permanent magnet iron separator has been running for a period of time, its filtration efficiency will decrease to some extent. Therefore, it is necessary to adjust the iron content of the effluent accordingly. The test results show that when the iron content in the effluent is above 30 μg / L, it indicates that the condensate filtered by the permanent magnet iron removal filter cannot achieve the expected iron removal effect. A cartridge-type iron removal filter needs to be put into operation for secondary filtration to ensure that the condensate entering the outlet pipe meets the expected iron removal requirements. When the iron content in the effluent from the permanent magnet iron removal filter is less than 30 μg / L, it indicates that the condensate filtered by the permanent magnet iron removal filter has achieved the expected iron removal effect. Therefore, it is not necessary to put the cartridge-type iron removal filter into operation again, effectively reducing the commissioning time of the cartridge-type iron removal filter and extending its backwashing cycle and service life.

[0017] Furthermore, the iron removal device also includes a first backwashing structure and a second backwashing structure; the first backwashing structure is used for online backwashing of the permanent magnet iron removal filter, and the second backwashing structure and water flow switching device are used for online backwashing of the cartridge-type iron removal filter. The iron removal process also includes:

[0018] Step S6: When the permanent magnet iron removal filter has been running for a first preset time, the permanent magnet iron removal filter is backwashed online using the first backwashing structure;

[0019] Step S6': When the cartridge-type iron removal filter is put into operation, the pressure difference between the inlet and outlet of the cartridge-type iron removal filter is detected. When the pressure difference is greater than or equal to the first preset pressure difference, the cartridge-type iron removal filter is backwashed online using the second backwashing structure and water flow switching device.

[0020] Steps S6 and S6' can be performed separately or simultaneously.

[0021] Online backwashing of the permanent magnet iron removal filter and / or cartridge iron removal filter can save the disassembly and assembly process of the magnetic rod of the permanent magnet iron removal filter and / or the high temperature resistant filter element of the cartridge iron removal filter, greatly reduce the backwashing time of the permanent magnet iron removal filter and / or cartridge iron removal filter, and help improve the working efficiency of the iron removal device.

[0022] Furthermore, the water flow switching device includes a cartridge-type iron removal filter inlet valve and a bypass valve. The cartridge-type iron removal filter inlet valve is installed on the second pipeline, and the connection point between the second pipeline and the bypass pipeline is a diversion point. The cartridge-type iron removal filter inlet valve is installed between the diversion point and the cartridge-type iron removal filter, and the bypass valve is installed on the bypass pipeline. The first backwashing structure includes a permanent magnet iron removal filter inlet valve, a permanent magnet iron removal filter outlet valve, a fourth pipeline, a permanent magnet iron removal filter backwash inlet valve, and a fifth pipeline. The system includes a pipeline and a backwash drain valve for the permanent magnet iron removal filter. The inlet valve of the permanent magnet iron removal filter is located on the first pipeline; the outlet valve of the permanent magnet iron removal filter is located on the second pipeline, and the outlet valve is positioned between the permanent magnet iron removal filter and the diversion point; the first end of the fourth pipeline is connected to the backwash inlet pipeline, and the second end of the fourth pipeline is connected to the backwash inlet of the permanent magnet iron removal filter; the backwash inlet valve of the permanent magnet iron removal filter is located on the fourth pipeline; the first end of the fifth pipeline is connected to the permanent magnet... The backwash outlet of the iron removal filter is connected, and the second end of the fifth pipeline is used to discharge the backwash water from the permanent magnet iron removal filter. The backwash drain valve of the permanent magnet iron removal filter is installed on the fifth pipeline. The second backwash structure includes a filter cartridge iron removal filter outlet valve, a sixth pipeline, a filter cartridge iron removal filter backwash inlet valve, a seventh pipeline, and a filter cartridge iron removal filter backwash drain valve. The filter cartridge iron removal filter outlet valve is installed on the third pipeline. The connection point between the bypass pipeline and the third pipeline is a confluence point. The filter cartridge iron removal filter... A water outlet valve is located between the confluence point and the cartridge-type iron removal filter; the first end of the sixth pipeline is connected to the backwash water inlet pipeline, the second end of the sixth pipeline is connected to the backwash water inlet of the cartridge-type iron removal filter, and the backwash water inlet valve of the cartridge-type iron removal filter is located on the sixth pipeline; the first end of the seventh pipeline is connected to the backwash water outlet of the cartridge-type iron removal filter, the second end of the seventh pipeline is used to discharge the backwash water from the cartridge-type iron removal filter, and the backwash drain valve of the cartridge-type iron removal filter is located on the seventh pipeline.

[0023] In the iron removal process, "starting the iron removal device to perform iron removal operation" includes at least: starting the inlet valve of the permanent magnet iron removal filter and the outlet valve of the permanent magnet iron removal filter;

[0024] "The cartridge-type iron removal filter is put into iron removal operation" includes: opening the inlet valve and outlet valve of the cartridge-type iron removal filter, and closing the bypass valve;

[0025] "Bypassing the cartridge-type iron removal filter and putting the bypass pipeline into operation" includes: closing the inlet valve and outlet valve of the cartridge-type iron removal filter and opening the bypass valve;

[0026] "Using the first backwashing structure to perform online backwashing operation on the permanent magnet iron removal filter" includes: closing the water inlet valve and the water outlet valve of the permanent magnet iron removal filter; opening the backwashing water inlet valve and the backwashing drain valve of the permanent magnet iron removal filter.

[0027] "Using the second backwashing structure and water flow switching device to perform online backwashing operation on the cartridge-type iron removal filter" includes: closing the inlet valve and outlet valve of the cartridge-type iron removal filter, and opening the backwash inlet valve and drain valve of the cartridge-type iron removal filter.

[0028] By coordinating the opening and closing of the aforementioned valves, the permanent magnet iron removal filter can be used for individual iron removal, or for dual iron removal by the permanent magnet iron removal filter and the cartridge iron removal filter. This achieves better iron removal results, effectively extends the service life of the cartridge iron removal filter, reduces operating costs, and enables online backwashing of the permanent magnet iron removal filter and / or the cartridge iron removal filter, effectively shortening backwashing time and improving the working efficiency of the iron removal device.

[0029] Furthermore, when step S6' is performed alone, the pH value of the high-temperature condensate water and the iron content of the water effluent from the permanent magnet iron removal filter are detected. When the pH value of the high-temperature condensate water and the iron content of the water effluent from the permanent magnet iron removal filter meet the third preset condition, the bypass pipeline is put into operation, and the iron removal device performs normal iron removal operation.

[0030] Correspondingly, when the pH value of the high-temperature condensate water and the iron content of the water effluent from the permanent magnet iron removal filter do not meet the third preset condition, or when step S6 is running, the iron removal device stops operating. "Putting the bypass pipeline into operation" means opening the bypass valve when the inlet valve and outlet valve of the cartridge-type iron removal filter are closed. This setting allows iron removal to continue during online backwashing of the cartridge-type iron removal filter, significantly improving the working efficiency of the iron removal device.

[0031] Furthermore, the third preset condition includes: the pH value of the high-temperature condensate water is ≥8.5, and the iron content of the water effluent from the permanent magnet iron removal filter is <30μg / L.

[0032] When the pH value of the high-temperature condensate and the iron content of the effluent from the permanent magnet iron removal filter meet the third preset condition, it indicates that the iron content in the high-temperature condensate is low, and the expected iron removal effect can be achieved by passing through the permanent magnet iron removal filter. Under this condition, the iron removal device can meet the expected iron removal effect by using only the permanent magnet iron removal filter. When the cartridge iron removal filter is in the online backwashing process, the iron removal device can work normally, which significantly improves the working efficiency of the iron removal device.

[0033] Furthermore, the iron removal device also includes an exhaust structure, which is used for the exhaust operation of the permanent magnet iron removal filter and / or the cartridge-type iron removal filter. The iron removal process also includes:

[0034] Step S11: When the iron removal device is turned on, the exhaust structure is used to exhaust the permanent magnet iron removal filter and / or the cartridge iron removal filter.

[0035] Step S61: After the permanent magnet iron removal filter is backwashed online, the permanent magnet iron removal filter is vented using the exhaust structure;

[0036] Step S61': After the online backwashing of the cartridge-type iron removal filter is completed, the exhaust structure is used to exhaust the filter.

[0037] Specifically, step S11 is executed after step S1, step S61 is executed after step S6, and step S61' is executed after step S6'.

[0038] When the iron removal device is in operation, there is a large amount of gas in the permanent magnet iron removal filter and / or the cartridge iron removal filter. Alternatively, after the permanent magnet iron removal filter and / or the cartridge iron removal filter has completed online backwashing, the backwash water needs to be drained, resulting in a large amount of gas inside. If the gas is not discharged in time, the internal air pressure of the permanent magnet iron removal filter and / or the cartridge iron removal filter will increase, affecting the entry of condensate and thus affecting the amount of condensate that can be treated. The exhaust structure discharges the gas from the permanent magnet iron removal filter and / or the cartridge iron removal filter, ensuring the working efficiency of the iron removal device.

[0039] Furthermore, the exhaust structure includes an eighth pipe, a permanent magnet iron removal filter exhaust valve, a ninth pipe, and a cartridge-type iron removal filter exhaust valve. The first end of the eighth pipe is connected to the exhaust port of the permanent magnet iron removal filter, and the second end of the eighth pipe is used to exhaust the gas in the permanent magnet iron removal filter. The permanent magnet iron removal filter exhaust valve is located on the eighth pipe. The first end of the ninth pipe is connected to the exhaust port of the cartridge-type iron removal filter, and the second end of the ninth pipe is used to exhaust the gas in the cartridge-type iron removal filter. The cartridge-type iron removal filter exhaust valve is located on the ninth pipe.

[0040] In the iron removal process, "using the exhaust structure to exhaust the permanent magnet iron removal filter" includes: opening the exhaust valve of the permanent magnet iron removal filter;

[0041] "Using the exhaust structure to perform an exhaust operation on the cartridge-type iron removal filter" includes: opening the exhaust valve of the cartridge-type iron removal filter.

[0042] The exhaust of the permanent magnet iron removal filter and / or the cartridge iron removal filter is controlled by opening and closing the exhaust valve of the permanent magnet iron removal filter and / or the cartridge iron removal filter. The operation is simple and convenient, and the gas in the exhaust valve of the permanent magnet iron removal filter and / or the cartridge iron removal filter can be quickly discharged to ensure the working efficiency of the iron removal device.

[0043] The present invention also discloses a condensate treatment system, which includes the high-temperature condensate iron removal device described above.

[0044] Compared with existing technologies, the high-temperature condensate iron removal device, iron removal process, and condensate treatment system described in this invention have the following advantages:

[0045] This invention utilizes a combination of a permanent magnet iron removal filter and a high-temperature resistant cartridge iron removal filter for iron removal and recycling of high-temperature condensate. The method of iron removal and recycling is determined based on the pH value and / or iron content of the condensate, using either a permanent magnet iron removal filter alone or a combination of both. The high-temperature resistant cartridge iron removal filter is only used in certain situations, significantly reducing its operating time. Furthermore, during the operation of the high-temperature resistant cartridge iron removal filter, the condensate first undergoes iron removal treatment via the permanent magnet iron removal filter, effectively reducing the clogging rate of the high-temperature resistant cartridge iron removal filter, extending the backwash cycle, lowering operating costs, increasing the service life of the high-temperature filter element, and reducing the cost of iron removal from high-temperature condensate. Attached Figure Description

[0046] Figure 1This is a schematic diagram of a high-temperature condensate iron removal device according to an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Permanent magnet iron removal filter; 2. Cartridge iron removal filter; 3. Bypass pipeline; 4. First pipeline; 5. Second pipeline; 6. Third pipeline; 7. Diversion point; 8. Fourth pipeline; 9. Fifth pipeline; 10. Sixth pipeline; 11. Inlet valve of permanent magnet iron removal filter; 12. Outlet valve of permanent magnet iron removal filter; 13. Inlet valve of cartridge iron removal filter; 14. Outlet valve of cartridge iron removal filter; 15. Seventh pipeline; 16. Eighth pipeline; 17. Ninth pipeline; 18. Merging point; 21. Backwash inlet valve of permanent magnet iron removal filter; 22. Backwash inlet valve of cartridge iron removal filter; 31. Backwash drain valve of permanent magnet iron removal filter; 32. Backwash drain valve of cartridge iron removal filter; 41. Air vent valve of permanent magnet iron removal filter; 42. Air vent valve of cartridge iron removal filter; 51. Bypass valve. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0050] The following describes in detail, with reference to the accompanying drawings, a high-temperature condensate iron removal device, iron removal process, and condensate treatment system according to an embodiment of the present invention.

[0051] Example 1

[0052] This embodiment provides a high-temperature condensate iron removal device, such as... Figure 1As shown, the system includes a permanent magnet iron removal filter 1, a cartridge iron removal filter 2, a bypass pipeline 3, and a water flow switching device. The condensate inlet of the permanent magnet iron removal filter 1 is connected to the condensate supply pipeline via a first pipeline 4. The condensate outlet of the permanent magnet iron removal filter 1 is connected to the condensate inlet of the cartridge iron removal filter 2 via a second pipeline 5. The condensate outlet of the cartridge iron removal filter 2 is connected to the outlet pipeline via a third pipeline 6. The first end of the bypass pipeline 3 is connected to the second pipeline 5, and the second end of the bypass pipeline 3 is connected to the third pipeline 6. The water flow switching device is used to switch the cartridge iron removal filter 2 into iron removal operation, or to bypass the cartridge iron removal filter 2 and put the bypass pipeline 3 into operation. The water flow switching device is used to switch the cartridge-type iron removal filter 2 to iron removal operation, or to bypass the cartridge-type iron removal filter 2 and put the bypass pipeline 3 into operation. This means that the water flow switching device is used to switch the condensate flowing out of the condensate outlet of the permanent magnet iron removal filter 1, so that it flows into the third pipeline 6 through the bypass pipeline 3 and then into the outlet pipeline, or so that it flows into the third pipeline 6 after iron removal by the cartridge-type iron removal filter 2 and then into the outlet pipeline. With the above settings, the condensate can be selectively controlled to undergo iron removal only through the permanent magnet iron removal filter 1, or to undergo iron removal twice through the permanent magnet iron removal filter 1 and the cartridge iron removal filter 2. When only the permanent magnet iron removal filter 1 is needed for iron removal, the water flow switching device controls the condensate flowing out of the permanent magnet iron removal filter 1 to flow into the outlet pipe through the bypass pipe 3, while simultaneously cutting off the condensate inlet of the cartridge iron removal filter 2. When both the permanent magnet iron removal filter 1 and the cartridge iron removal filter 2 need to be put into operation simultaneously, the water flow switching device controls the condensate flowing out of the permanent magnet iron removal filter 1 to undergo secondary iron removal through the cartridge iron removal filter 2, while simultaneously disconnecting the bypass pipe 3. It should be noted that the cartridge-type iron removal filter 2 described in this embodiment refers to a high-temperature resistant cartridge-type iron removal filter. This setup can remove iron and recover from high-temperature condensate, effectively avoiding the consumption of circulating cooling water and heat loss during low-temperature iron removal. Furthermore, it allows for the selection of appropriate iron removal device connections based on different condensate conditions, enabling the cartridge-type iron removal filter 2 to be selectively put into operation, significantly reducing its operating time. Simultaneously, when the cartridge-type iron removal filter 2 is in operation, the condensate entering it has already undergone iron removal treatment by the permanent magnet iron removal filter 1, effectively reducing the clogging rate of the cartridge-type iron removal filter 2, extending the backwashing cycle of the high-temperature resistant filter element, reducing the backwashing frequency, increasing its service life, extending the replacement cycle, and lowering the operating cost of the iron removal device.It should be understood that the specific structures of the permanent magnet iron removal filter 1 and the cartridge-type iron removal filter 2 are existing technologies and will not be described in detail here.

[0053] As an embodiment of the present invention, the water flow switching device includes a cartridge-type iron removal filter inlet valve 13 and a bypass valve 51. The cartridge-type iron removal filter inlet valve 13 is disposed on the second pipeline 5. The connection point between the second pipeline 5 and the bypass pipeline 3 is a diversion point 7. The cartridge-type iron removal filter inlet valve 13 is disposed between the diversion point 7 and the cartridge-type iron removal filter 2. The bypass valve 51 is disposed on the bypass pipeline 3. Specifically, during iron removal operation, the inlet valve 13 and bypass valve 51 of the cartridge-type iron removal filter are opened and closed in reverse connection. That is, when the inlet valve 13 of the cartridge-type iron removal filter is open, the bypass valve 51 is closed, and the cartridge-type iron removal filter 2 is put into operation. When the bypass valve 51 is open, the inlet valve 13 of the cartridge-type iron removal filter is closed, the bypass pipeline 3 is put into operation, and the cartridge-type iron removal filter 2 is disconnected. It should be understood that the water flow switching device can also be a two-position three-way reversing valve set at the diversion point 7, or other valve bodies with diversion switching function, which can be flexibly equipped according to specific circumstances.

[0054] In this embodiment, the iron removal device further includes a first backwashing structure, which is used for online backwashing of the permanent magnet iron removal filter 1. This configuration enables online backwashing of the permanent magnet iron removal filter 1, avoiding the disassembly and assembly process of the magnetic rods in the permanent magnet iron removal filter 1, greatly improving the backwashing efficiency of the permanent magnet iron removal filter 1, and helping to improve the working efficiency of the iron removal device.

[0055] As an embodiment of the present invention, the first backwashing structure includes a permanent magnet iron removal filter inlet valve 11, a permanent magnet iron removal filter outlet valve 12, a fourth pipeline 8, a permanent magnet iron removal filter backwash inlet valve 21, a fifth pipeline 9, and a permanent magnet iron removal filter backwash drain valve 31. The permanent magnet iron removal filter inlet valve 11 is disposed on the first pipeline 4; the permanent magnet iron removal filter outlet valve 12 is disposed on the second pipeline 5, and the permanent magnet iron removal filter outlet valve 12 is disposed between the permanent magnet iron removal filter 1 and the diversion pipe. Between points 7; the first end of the fourth pipe 8 is connected to the backwash water inlet pipe, the second end of the fourth pipe 8 is connected to the backwash inlet of the permanent magnet iron removal filter 1, and the backwash inlet valve 21 of the permanent magnet iron removal filter is installed on the fourth pipe 8; the first end of the fifth pipe 9 is connected to the backwash outlet of the permanent magnet iron removal filter 1, the second end of the fifth pipe 9 is used to discharge the backwash water in the permanent magnet iron removal filter 1, and the backwash drain valve 31 of the permanent magnet iron removal filter is installed on the fifth pipe 9. In this configuration, when the permanent magnet iron removal filter 1 needs to be backwashed, the permanent magnet iron removal filter inlet valve 11 and the permanent magnet iron removal filter outlet valve 12 are closed, and the permanent magnet iron removal filter backwash inlet valve 21 and the permanent magnet iron removal filter backwash drain valve 31 are opened to perform online backwashing of the permanent magnet iron removal filter 1. The operation is simple and quick, which can save the disassembly and assembly process of the magnetic rod in the permanent magnet iron removal filter 1, effectively shorten the backwashing time, and improve the working efficiency of the iron removal device.

[0056] In some preferred embodiments, the backwash inlet of the permanent magnet iron removal filter 1 is located near the upper part of the filter 1, and the backwash outlet is located near the bottom. This arrangement allows the backwash water to thoroughly backwash the filter 1 from top to bottom, improving the backwashing effect. Furthermore, the backwash water flows out from near the bottom of the filter 1, avoiding backwash water residue and effectively improving the backwashing quality. Preferably, the backwash outlet of the permanent magnet iron removal filter 1 is located at the bottom.

[0057] In some preferred embodiments, the iron removal device further includes a second backwashing structure, which, along with a water flow switching device, is used for online backwashing of the cartridge-type iron removal filter 2. This configuration enables online backwashing of the cartridge-type iron removal filter 2, avoiding the disassembly and reassembly backwashing process of the high-temperature resistant filter element in the cartridge-type iron removal filter 2, greatly improving the backwashing efficiency of the cartridge-type iron removal filter 2, and contributing to improved working efficiency of the iron removal device. It should be understood that the permanent magnet iron removal filter 1 and the cartridge-type iron removal filter 2 in the iron removal device can be backwashed simultaneously or separately. When the cartridge-type iron removal filter 2 is backwashed separately, the permanent magnet iron removal filter 1 can still perform iron removal, greatly improving the working efficiency of the production line. In other embodiments, the iron removal device does not include a second backwashing structure, and the cartridge-type iron removal filter 2 maintains its iron removal effect by replacing the high-temperature resistant filter element. The replaced high-temperature resistant filter element can also be regenerated by offline backwashing.

[0058] Specifically, the second backwashing structure includes a cartridge-type iron removal filter outlet valve 14, a sixth pipeline 10, a cartridge-type iron removal filter backwash inlet valve 22, a seventh pipeline 15, and a cartridge-type iron removal filter backwash drain valve 32. The cartridge-type iron removal filter outlet valve 14 is installed on the third pipeline 6. The connection point between the bypass pipeline 3 and the third pipeline 6 is a confluence point 18. The cartridge-type iron removal filter outlet valve 14 is located between the confluence point 18 and the cartridge-type iron removal filter 2. The sixth pipeline... The first end of the sixth pipe 10 is connected to the backwash water inlet pipe, and the second end of the sixth pipe 10 is connected to the backwash water inlet of the cartridge-type iron removal filter 2. The backwash water inlet valve 22 of the cartridge-type iron removal filter is installed on the sixth pipe 10. The first end of the seventh pipe 15 is connected to the backwash water outlet of the cartridge-type iron removal filter 2, and the second end of the seventh pipe 15 is used to discharge the backwash water in the cartridge-type iron removal filter 2. The backwash drain valve 32 of the cartridge-type iron removal filter is installed on the seventh pipe 15. In this setup, when backwashing the cartridge-type iron removal filter 2 is required, the outlet valve 14 of the cartridge-type iron removal filter is closed. Simultaneously, the water flow switching device cuts off the working water inlet of the cartridge-type iron removal filter 2. Cutting off the working water inlet includes closing the inlet valve 13 of the cartridge-type iron removal filter or connecting the second pipeline 5 to the bypass pipeline 3. After that, the backwash inlet valve 22 and the backwash drain valve 32 of the cartridge-type iron removal filter can be opened to perform online backwashing of the cartridge-type iron removal filter 2. The operation is simple and quick, which can eliminate the disassembly and assembly process of the high-temperature resistant filter element in the cartridge-type iron removal filter 2, effectively shorten the backwashing time, and improve the working efficiency of the iron removal device.

[0059] In some preferred embodiments, the backwash inlet of the cartridge-type iron removal filter 2 is located near the upper part of the cartridge-type iron removal filter 2, and the backwash outlet of the cartridge-type iron removal filter 2 is located near the bottom of the cartridge-type iron removal filter 2. This arrangement allows the backwash water to thoroughly backwash the cartridge-type iron removal filter 2 from top to bottom, improving the backwashing effect. Furthermore, the backwashed water flows out from near the bottom of the cartridge-type iron removal filter 2, avoiding backwash water residue and effectively improving the backwashing quality. Preferably, the backwash outlet of the cartridge-type iron removal filter 2 is located at the bottom of the cartridge-type iron removal filter 2.

[0060] As an embodiment of the present invention, the iron removal device further includes an exhaust structure, which includes an eighth pipe 16, a permanent magnet iron removal filter exhaust valve 41, a ninth pipe 17, and a cartridge-type iron removal filter exhaust valve 42. The first end of the eighth pipe 16 is connected to the exhaust port of the permanent magnet iron removal filter 1, and the second end of the eighth pipe 16 is used to discharge the gas in the permanent magnet iron removal filter 1. The permanent magnet iron removal filter exhaust valve 41 is disposed on the eighth pipe 16. The first end of the ninth pipe 17 is connected to the exhaust port of the cartridge-type iron removal filter 2, and the second end of the ninth pipe 17 is used to discharge the gas in the cartridge-type iron removal filter 2. The cartridge-type iron removal filter exhaust valve 42 is disposed on the ninth pipe 17. The exhaust structure is used to discharge gas from the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2 during initial startup of the iron removal device, after backwashing of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2, or after replacement of the magnetic rod or high-temperature resistant filter element. This is to prevent internal gas pressure buildup from preventing condensate from flowing in and affecting the normal operation of the iron removal device. When the permanent magnet iron removal filter 1 needs to be vented, the exhaust valve 41 is opened to discharge the gas through the eighth pipe 16; when the cartridge iron removal filter 2 needs to be vented, the exhaust valve 42 is opened to discharge the gas through the ninth pipe 17. It should be understood that the venting of the permanent magnet iron removal filter 1 and the cartridge iron removal filter 2 can be performed simultaneously or separately.

[0061] In some preferred embodiments, the exhaust structure is positioned near the upper part of the permanent magnet iron removal filter 1 and the cartridge iron removal filter 2. This arrangement prevents gas from accumulating on top of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2 after water intake, thus facilitating complete gas discharge.

[0062] Example 2

[0063] This embodiment discloses an iron removal process for use in the high-temperature condensate iron removal device as described in Embodiment 1, the iron removal process comprising:

[0064] Step S1: Turn on the iron removal device to perform iron removal operation;

[0065] Step S2: Detect the pH value of the high-temperature condensate water and determine whether the pH value meets the first preset condition; when the pH value meets the first preset condition, proceed to step S4; when the pH value does not meet the first preset condition, proceed to step S3.

[0066] Step S3: Detect the iron content in the effluent of the permanent magnet iron removal filter 1 and determine whether the iron content in the effluent meets the second preset condition; when the iron content in the effluent meets the second preset condition, proceed to step S4; when the iron content in the effluent does not meet the second preset condition, proceed to step S5.

[0067] Step S4: Put the cartridge-type iron removal filter 2 into operation for iron removal;

[0068] Step S5: Bypass the cartridge-type iron removal filter 2 and put the bypass pipeline 3 into operation.

[0069] In this process, when the bypass pipeline 3 is in operation, only the permanent magnet iron removal filter 1 participates in the iron removal work. Therefore, the cartridge-type iron removal filter 2 in this embodiment is selectively put into iron removal operation. Moreover, the condensate entering the cartridge-type iron removal filter 2 has already been treated by the permanent magnet iron removal filter 1, and the iron content in the condensate has been reduced. This can significantly reduce the fouling rate of the high-temperature resistant filter element in the cartridge-type iron removal filter 2, extend its backwashing or replacement cycle, and significantly reduce the operating cost of the iron removal device.

[0070] As an embodiment of the present invention, the first preset condition is: the pH value of the high-temperature condensate water is <8.5, and the second preset condition is: the iron content of the effluent from the permanent magnet iron removal filter 1 is ≥30μg / L.

[0071] When the pH value is < 8.5, it indicates that the iron content in the condensate is high. Using the permanent magnet iron separator filter 1 alone cannot achieve the desired iron removal effect. In this case, the cartridge iron separator filter 2 needs to be put into operation to perform secondary filtration on the condensate after the permanent magnet iron separator filter 1, thereby achieving the desired iron removal effect. When the pH value is ≥ 8.5, it indicates that the iron content in the condensate is moderate. In this case, the permanent magnet iron separator filter 1 can likely complete the iron removal work of the condensate and achieve the desired iron removal effect. However, after the permanent magnet iron separator filter 1 has been running for a period of time, its filtration effect will decrease to some extent. Therefore, it is necessary to adjust the iron content of the effluent accordingly. The test results show that when the iron content in the effluent is above 30 μg / L, it indicates that the condensate filtered by the permanent magnet iron removal filter 1 cannot achieve the expected iron removal effect. The cartridge iron removal filter 2 needs to be put into operation for secondary filtration to ensure that the condensate entering the final effluent pipe meets the expected iron removal requirements. When the iron content in the effluent from the permanent magnet iron removal filter 1 is less than 30 μg / L, it indicates that the condensate filtered by the permanent magnet iron removal filter 1 has achieved the expected iron removal effect. Therefore, the cartridge iron removal filter 2 does not need to be put into operation, effectively reducing the commissioning time of the cartridge iron removal filter 2 and extending its backwashing cycle and service life.

[0072] In this embodiment, the iron removal device further includes a first backwashing structure and a second backwashing structure; the first backwashing structure is used for online backwashing of the permanent magnet iron removal filter 1, and the second backwashing structure and water flow switching device are used for online backwashing of the cartridge-type iron removal filter 2. The iron removal process further includes:

[0073] Step S6: When the permanent magnet iron removal filter 1 has been running for a first preset time, the permanent magnet iron removal filter 1 is backwashed online using the first backwashing structure.

[0074] Step S6': When the cartridge-type iron removal filter 2 is put into iron removal operation, the pressure difference between the inlet and outlet of the cartridge-type iron removal filter 2 is detected. When the pressure difference is greater than or equal to the first preset pressure difference, the cartridge-type iron removal filter 2 is backwashed online using the second backwashing structure and water flow switching device.

[0075] Steps S6 and S6' can be performed separately or simultaneously.

[0076] It should be understood that online backwashing of the permanent magnet iron removal filter 1 and / or the cartridge-type iron removal filter 2 can save the disassembly and assembly process of the magnetic rod of the permanent magnet iron removal filter 1 and / or the high-temperature resistant filter element of the cartridge-type iron removal filter 2, greatly reducing the backwashing time of the permanent magnet iron removal filter 1 and / or the cartridge-type iron removal filter 2, and helping to improve the working efficiency of the iron removal device. In some embodiments, the first preset duration is one week and the first preset pressure difference is 0.1 MPa. It should be understood that the first preset duration and the first preset pressure difference are preset values, and each production line can flexibly set them according to specific circumstances.

[0077] Specifically, in this embodiment, the water flow switching device includes a cartridge-type iron removal filter inlet valve 13 and a bypass valve 51. The cartridge-type iron removal filter inlet valve 13 is installed on the second pipeline 5. The connection point between the second pipeline 5 and the bypass pipeline 3 is a diversion point 7. The cartridge-type iron removal filter inlet valve 13 is located between the diversion point 7 and the cartridge-type iron removal filter 2. The bypass valve 51 is installed on the bypass pipeline 3. The first backwashing structure includes a permanent magnet iron removal filter inlet valve 11, a permanent magnet iron removal filter outlet valve 12, a fourth pipeline 8, and a permanent magnet iron removal filter backwash inlet. The system includes valve 21, fifth pipeline 9, and backwash drain valve 31 for the permanent magnet iron removal filter. The inlet valve 11 of the permanent magnet iron removal filter is located on the first pipeline 4; the outlet valve 12 of the permanent magnet iron removal filter is located on the second pipeline 5, and is positioned between the permanent magnet iron removal filter 1 and the diversion point 7; the first end of the fourth pipeline 8 is connected to the backwash inlet pipeline, and the second end of the fourth pipeline 8 is connected to the backwash inlet of the permanent magnet iron removal filter 1; the backwash inlet valve 21 of the permanent magnet iron removal filter is located on the fourth pipeline 8; the first end of the fifth pipeline 9 is connected to the permanent magnet iron removal filter 1... The backwash outlet of the magnetic iron removal filter 1 is connected, and the second end of the fifth pipeline 9 is used to discharge the backwash water in the permanent magnet iron removal filter 1. The backwash drain valve 31 of the permanent magnet iron removal filter is installed on the fifth pipeline 9. The second backwash structure includes a filter cartridge iron removal filter outlet valve 14, a sixth pipeline 10, a filter cartridge iron removal filter backwash inlet valve 22, a seventh pipeline 15, and a filter cartridge iron removal filter backwash drain valve 32. The filter cartridge iron removal filter outlet valve 14 is installed on the third pipeline 6. The connection point between the bypass pipeline 3 and the third pipeline 6 is the confluence point 18. The filter cartridge iron removal filter... The outlet valve 14 is located between the confluence point 18 and the cartridge-type iron removal filter 2; the first end of the sixth pipeline 10 is connected to the backwash water pipeline, the second end of the sixth pipeline 10 is connected to the backwash inlet of the cartridge-type iron removal filter 2, and the backwash inlet valve 22 of the cartridge-type iron removal filter is located on the sixth pipeline 10; the first end of the seventh pipeline 15 is connected to the backwash outlet of the cartridge-type iron removal filter 2, the second end of the seventh pipeline 15 is used to discharge the backwash water in the cartridge-type iron removal filter 2, and the backwash drain valve 32 of the cartridge-type iron removal filter is located on the seventh pipeline 15;

[0078] Among them, “starting the iron removal device to carry out iron removal operation” includes at least: starting the inlet valve 11 and the outlet valve 12 of the permanent magnet iron removal filter;

[0079] "The cartridge-type iron removal filter 2 is put into iron removal operation" includes: opening the inlet valve 13 and outlet valve 14 of the cartridge-type iron removal filter, and closing the bypass valve 51.

[0080] "Bypassing the cartridge-type iron removal filter 2 and putting the bypass pipeline 3 into operation" includes: closing the cartridge-type iron removal filter inlet valve 13 and the cartridge-type iron removal filter outlet valve 14, and opening the bypass valve 51.

[0081] "Using the first backwashing structure to perform online backwashing operation on the permanent magnet iron removal filter 1" includes: closing the water inlet valve 11 and the water outlet valve 12 of the permanent magnet iron removal filter; opening the backwashing water inlet valve 21 and the backwashing drain valve 31 of the permanent magnet iron removal filter.

[0082] "Using the second backwashing structure and water flow switching device to perform online backwashing operation on the cartridge-type iron removal filter 2" includes: closing the cartridge-type iron removal filter inlet valve 13 and the cartridge-type iron removal filter outlet valve 14, and opening the cartridge-type iron removal filter backwash inlet valve 22 and the cartridge-type iron removal filter backwash drain valve 32.

[0083] By coordinating the opening and closing of the aforementioned valves, the permanent magnet iron removal filter 1 can be used for individual iron removal, or the permanent magnet iron removal filter 1 and the cartridge iron removal filter 2 can be used for dual iron removal, thereby achieving better iron removal effect, effectively extending the service life of the cartridge iron removal filter 2, reducing operating costs, and enabling online backwashing of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2, effectively shortening backwashing time and improving the working efficiency of the iron removal device.

[0084] In a preferred embodiment, when step S6' is performed alone, the pH value of the incoming high-temperature condensate and the iron content of the effluent from the permanent magnet iron removal filter 1 are detected. When the pH value of the incoming high-temperature condensate and the iron content of the effluent from the permanent magnet iron removal filter 1 meet the third preset condition, the bypass pipeline 3 is put into operation, and the iron removal device performs normal iron removal operation. Correspondingly, when the pH value of the incoming high-temperature condensate and the iron content of the effluent from the permanent magnet iron removal filter 1 do not meet the third preset condition, or when step S6 is running, the iron removal device stops operating. "Putting the bypass pipeline 3 into operation" means opening the bypass valve 51 when the inlet valve 13 and outlet valve 14 of the cartridge-type iron removal filter are closed. This setting allows the iron removal operation to continue during online backwashing of the cartridge-type iron removal filter 2, significantly improving the working efficiency of the iron removal device.

[0085] Specifically, the third preset condition includes: the pH value of the high-temperature condensate water is ≥8.5, and the iron content of the effluent from the permanent magnet iron removal filter 1 is <30μg / L. When the pH value of the high-temperature condensate water and the iron content of the effluent from the permanent magnet iron removal filter 1 meet the third preset condition, it indicates that the iron content in the high-temperature condensate water is low, and the expected iron removal effect can be achieved by passing through the permanent magnet iron removal filter 1. Under this condition, the iron removal device only needs to use the permanent magnet iron removal filter 1 to meet the expected iron removal effect. When the cartridge iron removal filter 2 is in the online backwashing process, the iron removal device can work normally, significantly improving the working efficiency of the iron removal device.

[0086] In this embodiment, the iron removal device further includes an exhaust structure, which is used for the exhaust operation of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2. The iron removal process further includes:

[0087] Step S11: When the iron removal device is turned on, the exhaust structure is used to exhaust the permanent magnet iron removal filter 1 and / or the filter cartridge iron removal filter 2.

[0088] Step S11 is performed after step S1.

[0089] When the iron removal device is turned on, there is a large amount of gas in the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2. If it is not discharged in time, the internal air pressure of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2 will increase, affecting the entry of condensate and thus affecting the amount of condensate treated. The exhaust structure discharges the gas in the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2, which can ensure the working efficiency of the iron removal device.

[0090] As one preferred embodiment, the iron removal process further includes:

[0091] Step S61: After the permanent magnet iron removal filter 1 is backwashed online, the permanent magnet iron removal filter 1 is vented using the exhaust structure;

[0092] Step S61': After the online backwashing of the cartridge-type iron removal filter 2 is completed, the exhaust structure is used to exhaust the cartridge-type iron removal filter 2.

[0093] Specifically, step S61 is executed after step S6, and step S61' is executed after step S6'.

[0094] After the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2 are backwashed online, the backwash water needs to be drained from their interiors. As a result, there is a lot of gas inside. If the iron removal operation is performed directly at this time, the internal gas pressure will increase, affecting the entry of condensate and thus affecting the amount of condensate that can be treated. Step S61 and / or step S61' discharges the gas from the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2, which can ensure the working efficiency of the iron removal device.

[0095] Specifically, the exhaust structure includes an eighth pipe 16, a permanent magnet iron removal filter exhaust valve 41, a ninth pipe 17, and a cartridge-type iron removal filter exhaust valve 42. The first end of the eighth pipe 16 is connected to the exhaust port of the permanent magnet iron removal filter 1, and the second end of the eighth pipe 16 is used to exhaust the gas in the permanent magnet iron removal filter 1. The permanent magnet iron removal filter exhaust valve 41 is installed on the eighth pipe 16. The first end of the ninth pipe 17 is connected to the exhaust port of the cartridge-type iron removal filter 2, and the second end of the ninth pipe 17 is used to exhaust the gas in the cartridge-type iron removal filter 2. The cartridge-type iron removal filter exhaust valve 42 is installed on the ninth pipe 17.

[0096] The phrase "using the exhaust structure to exhaust the permanent magnet iron removal filter 1" includes: opening the exhaust valve 41 of the permanent magnet iron removal filter;

[0097] "Using the exhaust structure to exhaust the filter cartridge type iron removal filter 2" includes: opening the exhaust valve 42 of the filter cartridge type iron removal filter.

[0098] The exhaust of the permanent magnet iron removal filter 1 and / or the cartridge iron removal filter 2 is controlled by opening and closing the exhaust valve 41 of the permanent magnet iron removal filter and / or the exhaust valve 42 of the cartridge iron removal filter. The operation is simple and convenient, and the gas in the exhaust valve 41 of the permanent magnet iron removal filter and / or the exhaust valve 42 of the cartridge iron removal filter can be quickly discharged to ensure the working efficiency of the iron removal device.

[0099] Example 3

[0100] This embodiment discloses a condensate treatment system, which includes a high-temperature condensate iron removal device as described in Embodiment 1 or an iron removal method as described in Embodiment 2.

[0101] It should be noted that the high-temperature condensate iron removal device, iron removal method and condensate treatment system provided by the present invention can be used for high-temperature condensate treatment in the coal chemical industry, and can also be used in other technical fields that require high-temperature condensate iron removal treatment, and are not limited here.

[0102] While the present invention has been disclosed above, it is not limited thereto. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A high temperature condensed water iron removal process characterized by, The device is used for removing iron from high-temperature condensate. The iron removal device includes a permanent magnet iron removal filter (1), a cartridge iron removal filter (2), a bypass pipeline (3), and a water flow switching device. The condensate inlet of the permanent magnet iron removal filter (1) is connected to the condensate water supply pipeline through a first pipeline (4). The condensate outlet of the permanent magnet iron removal filter (1) is connected to the condensate inlet of the cartridge iron removal filter (2) through a second pipeline (5). The condensate outlet of the cartridge iron removal filter (2) is connected to the outlet pipeline through a third pipeline (6). The first end of the bypass pipeline (3) is connected to the second pipeline (5), and the second end of the bypass pipeline (3) is connected to the third pipeline (6). The water flow switching device is used to switch the cartridge iron removal filter (2) to iron removal operation, or to bypass the cartridge iron removal filter (2) and put the bypass pipeline (3) into operation. The iron removal process includes: Step S1: Turn on the iron removal device to perform iron removal operation; Step S2: Detect the pH value of the high-temperature condensate water and determine whether the pH value meets the first preset condition; when the pH value meets the first preset condition, proceed to step S4; when the pH value does not meet the first preset condition, proceed to step S3. Step S3: Detect the iron content in the effluent of the permanent magnet iron removal filter (1) and determine whether the iron content in the effluent meets the second preset condition; when the iron content in the effluent meets the second preset condition, proceed to step S4; when the iron content in the effluent does not meet the second preset condition, proceed to step S5. Step S4: Put the cartridge-type iron removal filter (2) into the iron removal operation; Step S5: Bypass the cartridge-type iron removal filter (2) and put the bypass pipeline (3) into operation; The iron removal device further includes a first backwashing structure and a second backwashing structure; the first backwashing structure is used for online backwashing of the permanent magnet iron removal filter (1), and the second backwashing structure and water flow switching device are used for online backwashing of the cartridge iron removal filter (2). The iron removal process further includes: Step S6: When the permanent magnet iron removal filter (1) has been running for a first preset time, the permanent magnet iron removal filter (1) is backwashed online using the first backwashing structure; Step S6': When the cartridge-type iron removal filter (2) is put into iron removal operation, the pressure difference between the inlet and outlet of the cartridge-type iron removal filter (2) is detected. When the pressure difference is greater than or equal to the first preset pressure difference, the cartridge-type iron removal filter (2) is backwashed online using the second backwashing structure and water flow switching device. Steps S6 and S6' can be performed separately or simultaneously. The iron removal device further includes an exhaust structure for the exhaust operation of the permanent magnet iron removal filter (1) and / or the cartridge iron removal filter (2). The iron removal process further includes: Step S11: When the iron removal device is turned on, the exhaust structure is used to exhaust the permanent magnet iron removal filter (1) and / or the filter cartridge iron removal filter (2); Step S61: After the permanent magnet iron removal filter (1) is backwashed online, the permanent magnet iron removal filter (1) is vented using the exhaust structure; Step S61': After the online backwashing of the cartridge-type iron removal filter (2) is completed, the exhaust structure is used to exhaust the cartridge-type iron removal filter (2); Specifically, step S11 is executed after step S1, step S61 is executed after step S6, and step S61' is executed after step S6'.

2. The de-ironing process of claim 1, wherein, The first preset condition is: the pH value of the high-temperature condensate is <8.5, and the second preset condition is: the iron content of the effluent from the permanent magnet iron removal filter (1) is ≥30μg / L.

3. The de-ironing process of claim 1, wherein, The water flow switching device includes a cartridge-type iron removal filter inlet valve (13) and a bypass valve (51). The cartridge-type iron removal filter inlet valve (13) is installed on the second pipeline (5). The connection point between the second pipeline (5) and the bypass pipeline (3) is a diversion point (7). The cartridge-type iron removal filter inlet valve (13) is installed between the diversion point (7) and the cartridge-type iron removal filter (2). The bypass valve (51) is installed on the bypass pipeline (3). The first backwashing structure includes a permanent magnet iron removal filter inlet valve (11), a permanent magnet iron removal filter outlet valve (12), a fourth pipeline (8), a permanent magnet iron removal filter backwash inlet valve (21), and a fifth pipeline. Pipeline (9) and backwash drain valve (31) of permanent magnet iron removal filter, the inlet valve (11) of permanent magnet iron removal filter is set on the first pipeline (4); the outlet valve (12) of permanent magnet iron removal filter is set on the second pipeline (5), and the outlet valve (12) of permanent magnet iron removal filter is set between the permanent magnet iron removal filter (1) and the diversion point (7); the first end of the fourth pipeline (8) is connected to the backwash water pipeline, the second end of the fourth pipeline (8) is connected to the backwash inlet of the permanent magnet iron removal filter (1), and the backwash inlet valve (21) of permanent magnet iron removal filter is set on the fourth pipeline (8); the first end of the fifth pipeline (9) is connected to the permanent magnet iron removal filter. The backwash outlet of the filter (1) is connected, and the second end of the fifth pipeline (9) is used to discharge the backwash water in the permanent magnet iron removal filter (1). The backwash drain valve (31) of the permanent magnet iron removal filter is set on the fifth pipeline (9). The second backwash structure includes the filter cartridge iron removal filter outlet valve (14), the sixth pipeline (10), the filter cartridge iron removal filter backwash inlet valve (22), the seventh pipeline (15), and the filter cartridge iron removal filter backwash drain valve (32). The filter cartridge iron removal filter outlet valve (14) is set on the third pipeline (6). The connection point between the bypass pipeline (3) and the third pipeline (6) is the confluence point (18). The filter cartridge iron removal filter outlet... A water valve (14) is located between the confluence point (18) and the cartridge-type iron removal filter (2); the first end of the sixth pipeline (10) is connected to the backwash water pipeline, the second end of the sixth pipeline (10) is connected to the backwash water inlet of the cartridge-type iron removal filter (2), and the backwash water inlet valve (22) of the cartridge-type iron removal filter is located on the sixth pipeline (10); the first end of the seventh pipeline (15) is connected to the backwash water outlet of the cartridge-type iron removal filter (2), the second end of the seventh pipeline (15) is used to discharge the backwash water in the cartridge-type iron removal filter (2), and the backwash drain valve (32) of the cartridge-type iron removal filter is located on the seventh pipeline (15); In the iron removal process, "starting the iron removal device to carry out iron removal operation" includes at least: starting the inlet valve (11) of the permanent magnet iron removal filter and the outlet valve (12) of the permanent magnet iron removal filter. "The cartridge-type iron removal filter (2) is put into iron removal operation" includes: opening the inlet valve (13) and outlet valve (14) of the cartridge-type iron removal filter, and closing the bypass valve (51). "Bypass the cartridge-type iron removal filter (2) and put the bypass pipeline (3) into operation" includes: closing the cartridge-type iron removal filter inlet valve (13) and the cartridge-type iron removal filter outlet valve (14), and opening the bypass valve (51). "Using the first backwashing structure to perform online backwashing operation on the permanent magnet iron removal filter (1)" includes: closing the permanent magnet iron removal filter inlet valve (11) and the permanent magnet iron removal filter outlet valve (12); opening the permanent magnet iron removal filter backwashing inlet valve (21) and the permanent magnet iron removal filter backwashing drain valve (31); "Using the second backwashing structure and water flow switching device to perform online backwashing operation on the cartridge-type iron removal filter (2)" includes: closing the cartridge-type iron removal filter inlet valve (13) and the cartridge-type iron removal filter outlet valve (14), and opening the cartridge-type iron removal filter backwash inlet valve (22) and the cartridge-type iron removal filter backwash drain valve (32).

4. The de-ironing process of claim 1, wherein, When step S6' is performed alone, the pH value of the high-temperature condensate water and the iron content of the water effluent from the permanent magnet iron removal filter (1) are detected. When the pH value of the high-temperature condensate water and the iron content of the water effluent from the permanent magnet iron removal filter (1) meet the third preset condition, the bypass pipeline (3) is put into operation and the iron removal device performs normal iron removal operation.

5. The iron removal process as described in claim 4, characterized in that, The third preset condition includes: the pH value of the high-temperature condensate water is ≥8.5, and the iron content of the water effluent from the permanent magnet iron removal filter (1) is <30μg / L.

6. The iron removal process as described in claim 1, characterized in that, The exhaust structure includes an eighth pipe (16), a permanent magnet iron removal filter exhaust valve (41), a ninth pipe (17), and a cartridge iron removal filter exhaust valve (42). The first end of the eighth pipe (16) is connected to the exhaust port of the permanent magnet iron removal filter (1), and the second end of the eighth pipe (16) is used to discharge the gas in the permanent magnet iron removal filter (1). The permanent magnet iron removal filter exhaust valve (41) is installed on the eighth pipe (16). The first end of the ninth pipe (17) is connected to the exhaust port of the cartridge iron removal filter (2), and the second end of the ninth pipe (17) is used to discharge the gas in the cartridge iron removal filter (2). The cartridge iron removal filter exhaust valve (42) is installed on the ninth pipe (17). In the iron removal process, "using the exhaust structure to exhaust the permanent magnet iron removal filter (1)" includes: opening the exhaust valve (41) of the permanent magnet iron removal filter. "Using the exhaust structure to exhaust the filter cartridge type iron removal filter (2)" includes: opening the exhaust valve (42) of the filter cartridge type iron removal filter.

7. A condensate treatment system, characterized in that, The high-temperature condensate iron removal process as described in claim 1 is adopted.

Images