Boiler make-up water treatment system and method

Abstract

The invention provides a boiler make-up water treatment system and method. The treatment system comprises a pretreatment module and an ion exchange module which are arranged in sequence; the pretreatment module is configured to perform ultrafiltration treatment on boiler raw water by adopting a ceramic ultrafiltration membrane to obtain ultrafiltration produced water; and the ion exchange module is configured to perform ion exchange treatment on the ultrafiltration produced water to obtain boiler make-up water. According to the invention, not only can the occupied area of the treatment system be reduced, but also most sediments in the boiler raw water can be effectively filtered, the turbidity of the boiler raw water is reduced, the pollution to a subsequent ion exchange module is reduced, and the regeneration period of ion exchange resin is prolonged. The ceramic ultrafiltration membrane adopted in the invention has higher oxidation resistance and mechanical strength, can effectively avoid the phenomenon of wire breakage, and is more stable in equipment operation and longer in service life. And the ceramic ultrafiltration membrane adopts a cross-flow filtering mode, so that the anti-pollution capability is stronger, and the chemical cleaning frequency is low.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a boiler feed water treatment system and method. Background Art

[0002] At present, boilers are widely used in some thermal power plants and some factories. Long-term practice has made people realize that the quality of water in boiler feed water is one of the important factors affecting the safe and economical operation of boiler equipment.

[0003] Boiler feed water is typically prepared from surface water or groundwater. Due to the poor and fluctuating quality of surface water, a treatment process combining "multi-media filter + organic ultrafiltration membrane + two-stage reverse osmosis membrane + EDI / mixed bed" or "multi-media filtration + activated carbon adsorption + reverse osmosis + EDI / mixed bed" is typically used to treat this water to ensure that the effluent meets boiler water quality requirements.

[0004] However, although traditional organic ultrafiltration membranes (such as PVDF ultrafiltration membranes) are widely used in the preparation of boiler feed water, traditional organic ultrafiltration membranes have problems such as poor thermal stability (long-term operating temperature below 60°C), narrow chemical corrosion resistance range (pH tolerance range is 2-11), and an annual wire breakage rate of more than 3% due to insufficient mechanical strength. In addition, the conventional pretreatment process of "multi-media filtration + activated carbon" has a low retention efficiency for nano-scale pollutants, and the removal rate of colloidal substances is less than 85%, resulting in a subsequent reverse osmosis membrane pollution index greater than 3. Moreover, the current boiler feed water treatment system has problems such as large footprint, high frequency of chemical cleaning (usually 6 to 12 cleanings per year), and short service life of organic ultrafiltration membranes (generally 3 to 5 years). Summary of the Invention

[0005] The object of the present invention is to provide a boiler feed water treatment system and method to solve one or more problems existing in the prior art, such as poor thermal stability, narrow chemical corrosion resistance range, high annual wire breakage rate, short service life of traditional organic ultrafiltration membranes, large treatment system footprint, high chemical cleaning frequency, and low pollutant retention efficiency.

[0006] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a boiler feed water treatment system, comprising a pretreatment module and an ion exchange module arranged in sequence; the pretreatment module is configured to: use a ceramic ultrafiltration membrane to ultrafilter boiler raw water to obtain ultrafiltration product water; the ion exchange module is configured to: perform ion exchange treatment on the ultrafiltration product water to obtain the boiler feed water.

[0007] Optionally, the pretreatment module includes a filtration unit and a ceramic ultrafiltration unit arranged in sequence; the filtration unit includes a flocculation device and a filtration device arranged in sequence, the ceramic ultrafiltration unit includes a ceramic ultrafiltration device and an ultrafiltration water production tank arranged in sequence, and the inlet end of the ceramic ultrafiltration device is connected to the outlet end of the filtration device; the flocculation device is configured to: perform flocculation treatment on the boiler raw water; the filtration device is configured to: perform filtration treatment on the boiler raw water to obtain filtered water; the ceramic ultrafiltration device is configured to: use a ceramic ultrafiltration membrane to perform ultrafiltration treatment on the filtered water to obtain the ultrafiltration water production; the ultrafiltration water production tank is configured to: store the ultrafiltration water production.

[0008] Optionally, the ceramic ultrafiltration unit also includes an ultrafiltration backwash pump connected to the outlet of the ultrafiltration water production tank, and the outlet of the ultrafiltration backwash pump is connected to the water production end of the ceramic ultrafiltration device; the ultrafiltration backwash pump is configured to: transport a portion of the ultrafiltration water production to the interior of the ceramic ultrafiltration device to backwash the ceramic ultrafiltration device.

[0009] Optionally, the ion exchange module includes a cation exchange unit, an anion exchange unit and a mixed ion exchange unit arranged in sequence, and the inlet end of the cation exchange unit is connected to the outlet end of the ceramic ultrafiltration unit; the cation exchange unit is configured to: perform cation exchange treatment and decarbonization treatment on the ultrafiltration water in sequence to obtain decarbonized effluent; the anion exchange unit is configured to: perform anion exchange treatment on the decarbonized effluent to obtain primary desalted water; the mixed ion exchange unit is configured to: perform mixed ion exchange treatment on the primary desalted water to obtain the boiler feed water.

[0010] Optionally, the cation exchange unit includes a first water supply pump, a cation exchanger, a decarbonization device and a water storage tank arranged in sequence, and the inlet end of the first water supply pump is connected to the outlet end of the pretreatment module; the first water supply pump is configured to: transport the ultrafiltration water to the cation exchanger; the cation exchanger is configured to: perform cation exchange treatment on the ultrafiltration water; the decarbonization device is configured to: decarbonize the effluent after the cation exchange treatment to obtain the decarbonized effluent water; the water storage tank is configured to: store the decarbonized effluent water.

[0011] Optionally, the anion exchange unit includes a second water supply pump and an anion exchanger arranged in sequence, and the inlet end of the second water supply pump is connected to the outlet end of the cation exchange unit; the second water supply pump is configured to: transport the decarbonized effluent to the anion exchanger; the anion exchanger is configured to: perform anion exchange treatment on the decarbonized effluent to obtain the primary desalted water.

[0012] Optionally, the mixed ion exchange unit includes a mixed ion exchanger and a desalted water tank arranged in sequence, and the inlet end of the mixed ion exchanger is connected to the outlet end of the anion exchange unit; the mixed ion exchanger is configured to: perform mixed ion exchange treatment on the first-level desalted water to obtain the boiler feed water; the desalted water tank is configured to: store the boiler feed water.

[0013] Optionally, the treatment system also includes a resin regeneration waste liquid collection module, which includes an acid collection device and an alkali collection device, the acid collection device is connected to both the cation exchange unit and the mixed ion exchange unit, and the alkali collection device is connected to both the anion exchange unit and the mixed ion exchange unit; the acid collection device is configured to collect the acidic regeneration waste liquid of the cation exchange unit and the mixed ion exchange unit; the alkali collection device is configured to collect the alkaline regeneration waste liquid of the anion exchange unit and the mixed ion exchange unit.

[0014] Optionally, the treatment system also includes a flushing wastewater collection and treatment module, which includes a flushing wastewater collection device, a first delivery pump, a sedimentation device and a second delivery pump arranged in sequence, the flushing wastewater collection device is connected to the ceramic ultrafiltration device and the ion exchange module, the sedimentation device is connected to a sludge treatment device, and the output end of the second delivery pump is connected to the inlet end of the flocculation device; the flushing wastewater collection device is configured to collect the concentrated water and backwash water output by the ceramic ultrafiltration device and the forward and backwash drainage output by the ion exchange module; the first delivery pump is configured to transport the flushing wastewater in the flushing wastewater collection device to the sedimentation device; the sedimentation device is configured to perform flocculation and sedimentation treatment on the received flushing wastewater to obtain supernatant and sludge; the second delivery pump is configured to transport the supernatant to the inlet end of the flocculation device; the sludge treatment device is configured to collect the sludge and perform sludge discharge treatment.

[0015] To achieve the above object, the present invention further provides a method for treating boiler feed water, wherein the boiler feed water is treated by using any of the above-mentioned boiler feed water treatment systems to obtain the boiler feed water. The treatment method comprises:

[0016] Use ceramic ultrafiltration membrane to ultrafilter the boiler raw water to obtain ultrafiltration water;

[0017] The ultrafiltration water is subjected to ion exchange treatment to obtain boiler feed water.

[0018] Compared with the prior art, the boiler feed water treatment system and method provided by the present invention have the following beneficial effects:

[0019] The boiler feed water treatment system provided by the present invention includes a pretreatment module and an ion exchange module, which are arranged in sequence. The pretreatment module is configured to ultrafilter boiler raw water using a ceramic ultrafiltration membrane to obtain ultrafiltration product water; and the ion exchange module is configured to perform ion exchange treatment on the ultrafiltration product water to obtain the boiler feed water. Thus, the boiler feed water treatment system provided by the present invention, by providing a pretreatment module and ultrafiltration treatment of boiler raw water using a ceramic ultrafiltration membrane, can not only reduce the footprint of the treatment system, but also effectively filter most of the sediment in the boiler raw water, reducing the turbidity of the boiler raw water, thereby reducing contamination of the subsequent ion exchange module and extending the regeneration cycle of the ion exchange resin in the ion exchange module. Compared with the organic ultrafiltration membranes used in the prior art, the ceramic ultrafiltration membrane used in the present invention has higher oxidation resistance and mechanical strength, can effectively prevent wire breakage, and has more stable equipment operation and longer service life. In addition, the ceramic ultrafiltration membrane adopts a cross-flow filtration method, has stronger anti-pollution ability and reduces the frequency of chemical cleaning, which not only saves chemical cleaning agents but also reduces the amount of cleaning wastewater discharged. Furthermore, by setting up an ion exchange module to perform ion exchange treatment on the ultrafiltration water, anions and cations in the ultrafiltration water can be effectively removed to produce boiler feed water that meets the requirements.

[0020] Since the boiler feed water treatment method provided by the present invention and the boiler feed water treatment system provided by the present invention belong to the same inventive concept, the boiler feed water treatment method provided by the present invention has at least all the advantages of the boiler feed water treatment system provided by the present invention. For the advantages of the boiler feed water treatment method provided by the present invention, please refer to the relevant description of the beneficial effects of the boiler feed water treatment system provided by the present invention, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural block diagram of a boiler feed water treatment system provided in Example 1 of the present invention;

[0022] Figure 2 A process flow chart of a boiler feed water treatment system provided in Example 1 of the present invention;

[0023] Figure 3 A schematic flow chart of a boiler feed water treatment method provided in Example 2 of the present invention;

[0024] The following are the descriptions of the reference numerals:

[0025] 1-pretreatment module, 11-filtration unit, 111-flocculation device, 112-filtration device, 12-ceramic ultrafiltration unit, 121-ceramic ultrafiltration device, 122-ultrafiltration water tank, 123-ultrafiltration backwash pump;

[0026] 2- ion exchange module, 21- cation exchange unit, 211- first water feed pump, 212- cation exchanger, 213- decarbonization device, 214- water storage tank, 22- anion exchange unit, 221- second water feed pump, 222- anion exchanger, 23- mixed ion exchange unit, 231- mixed ion exchanger, 232- desalted water tank;

[0027] 3-resin regeneration waste liquid collection module, 31-acid collection device, 32-alkali collection device;

[0028] 4- flushing wastewater collection and treatment module, 41- flushing wastewater collection device, 42- first delivery pump, 43- sedimentation device, 44- second delivery pump, 45- sludge treatment device. DETAILED DESCRIPTION

[0029] The following is a detailed description of the boiler feed water treatment system and method proposed by the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the objectives of the embodiments of the present invention. To make the objectives, features, and advantages of the present invention more readily apparent, please refer to the accompanying drawings. It should be noted that the structures, proportions, and sizes illustrated in the drawings are intended solely to facilitate understanding and reading by those skilled in the art, and are not intended to limit the implementation of the present invention. Any structural modifications, changes in proportions, or adjustments in size, provided they produce the same or similar effects and achieve the same objectives, will still fall within the scope of the technical content disclosed herein. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and environment in which they are intended. Furthermore, in the embodiments described below, the same reference numerals may be used across different drawings to denote the same parts or parts having the same functions, and their repeated descriptions may be omitted.

[0030] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0031] It should be understood that, unless otherwise stated or obvious from the context, as used herein, the term "about" is understood to be within the normal tolerance range in the art, for example, within 2 standard deviations of the mean. "About" can be understood to be within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05% or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values ​​provided herein are modified by the term "about".

[0032] Example 1

[0033] This embodiment provides a boiler feed water treatment system. Figure 1 , Figure 1 This is a structural block diagram of the boiler feed water treatment system provided in this embodiment. Figure 1 It can be seen that the treatment system includes a pretreatment module 1 and an ion exchange module 2 arranged in sequence; the pretreatment module 1 is configured to: use a ceramic ultrafiltration membrane to ultrafilter the boiler raw water to obtain ultrafiltration product water; the ion exchange module 2 is configured to: perform ion exchange treatment on the ultrafiltration product water to obtain the boiler feed water.

[0034] Therefore, the boiler feed water treatment system provided in this embodiment, by providing a pretreatment module 1, uses a ceramic ultrafiltration membrane to ultrafiltration treat the boiler raw water, which can not only reduce the footprint of the treatment system, but also effectively filter most of the sediment in the boiler raw water, reduce the turbidity of the boiler raw water, thereby reducing the pollution of the subsequent ion exchange module 2 and extending the regeneration cycle of the ion exchange resin in the ion exchange module 2. Compared with the organic ultrafiltration membrane used in the prior art, the ceramic ultrafiltration membrane used in this embodiment has higher oxidation resistance and mechanical strength, can effectively avoid the phenomenon of broken wires, and the equipment operation is more stable and has a longer service life. In addition, the ceramic ultrafiltration membrane adopts a cross-flow filtration method, has stronger anti-pollution ability, and has a low frequency of chemical cleaning, which can not only save chemical cleaning agents, but also reduce the amount of cleaning wastewater discharged. Furthermore, by providing an ion exchange module 2 to perform ion exchange treatment on the ultrafiltration water, anions and cations in the ultrafiltration water can be effectively removed to produce boiler feed water that meets the requirements.

[0035] It should be noted that in some exemplary embodiments, the ceramic ultrafiltration membrane uses alumina as the support layer and zirconia as the separation layer. It has a pore size of 30 nanometers and is manufactured through a high-temperature sintering process at 1700°C. It exhibits excellent thermal stability and oxidation resistance, effectively intercepting colloids, organic matter, and nanoscale contaminants. In this embodiment, the high efficiency of this ceramic ultrafiltration membrane can reduce the turbidity of the ultrafiltration product water to less than 0.1 NTU, thereby reducing contamination of the subsequent ion exchange module 2 and effectively extending the regeneration cycle of the ion exchange resin in the ion exchange module 2.

[0036] It should be noted that, as those skilled in the art will appreciate, the boiler raw water may include but is not limited to surface water and groundwater.

[0037] Preferably, see Figure 2 , Figure 2 The process flow chart of the boiler feed water treatment system provided in this embodiment. Figure 2 It can be seen that in some embodiments, the pretreatment module 1 includes a filtration unit 11 and a ceramic ultrafiltration unit 12 arranged in sequence; the filtration unit 11 includes a flocculation device 111 and a filtration device 112 arranged in sequence, and the ceramic ultrafiltration unit 12 includes a ceramic ultrafiltration device 121 and an ultrafiltration water production tank 122 arranged in sequence, and the inlet end of the ceramic ultrafiltration device 121 is connected to the outlet end of the filtration device 112; the flocculation device 111 is configured to: flocculate the boiler raw water; the filtration device 112 is configured to: filter the boiler raw water to obtain filtered water; the ceramic ultrafiltration device 121 is configured to: use a ceramic ultrafiltration membrane to ultrafilter the filtered water to obtain the ultrafiltration water; the ultrafiltration water production tank 122 is configured to: store the ultrafiltration water. Thus, the flocculation device 111 first allows suspended particles in the boiler raw water to quickly aggregate and settle. The filtration device 112 then filters the boiler raw water, removing some of the sediment and initially reducing its turbidity. The ceramic ultrafiltration device 121 then filters most of the sediment, significantly reducing its turbidity. This reduces contamination of the subsequent ion exchange module 2 and extends the regeneration cycle of the ion exchange resin in the module. Finally, the ultrafiltration product water treated by the ceramic ultrafiltration device 121 is stored in the ultrafiltration product tank 122.

[0038] For example, in some embodiments, the flocculation device 111 may include a flocculation tank (not shown in the figure), which is provided with a stirring device (not shown in the figure); the filtering device 112 may include a self-cleaning filter (not shown in the figure). Thus, by adding a flocculant to the flocculation tank and stirring it with the stirring device, the boiler raw water transported to the flocculation tank can fully undergo a flocculation reaction, thereby allowing the suspended particles in the boiler raw water to quickly aggregate and settle. Furthermore, the self-cleaning filter can efficiently filter a portion of the sediment in the boiler raw water, thereby reducing the pollution risk and operating pressure of the subsequent ceramic ultrafiltration unit 12.

[0039] Please continue to see Figure 2 ,like Figure 2 As shown, in some exemplary embodiments, the ceramic ultrafiltration unit 12 further includes an ultrafiltration backwash pump 123 connected to the outlet of the ultrafiltration product water tank 122, and the outlet of the ultrafiltration backwash pump 123 is connected to the water production end of the ceramic ultrafiltration device 121. The ultrafiltration backwash pump 123 is configured to: transport a portion of the ultrafiltration product water to the interior of the ceramic ultrafiltration device 121 to backwash the ceramic ultrafiltration device 121. Therefore, by transporting a portion of the ultrafiltration product water from the water production end back to the interior of the ceramic ultrafiltration device 121 by the ultrafiltration backwash pump 123 to backwash the ceramic ultrafiltration device 121, the membrane surface contaminants can be effectively removed and the membrane flux can be restored.

[0040] For further information, please see Figure 2 ,from Figure 2It can be seen that in some embodiments, the ion exchange module 2 includes a cation exchange unit 21, an anion exchange unit 22 and a mixed ion exchange unit 23 arranged in sequence, and the inlet end of the cation exchange unit 21 is connected to the outlet end of the ceramic ultrafiltration unit 12; the cation exchange unit 21 is configured to: perform cation exchange treatment and decarbonization treatment on the ultrafiltration water in sequence to obtain decarbonized effluent; the anion exchange unit 22 is configured to: perform anion exchange treatment on the decarbonized effluent to obtain primary demineralized water; the mixed ion exchange unit 23 is configured to: perform mixed ion exchange treatment on the primary demineralized water to obtain the boiler feed water. Thus, the ultrafiltration water is first subjected to cation exchange treatment by the cation exchange unit 21, so that most of the cations in the ultrafiltration water are replaced by hydrogen ions and become soft water, and the effluent after the cation exchange treatment is acidic; the effluent after the cation exchange treatment is then subjected to decarbonization treatment, which can remove carbon dioxide from the effluent after the cation exchange treatment to obtain decarbonized effluent. Next, the decarbonized effluent undergoes anion exchange treatment in anion exchange unit 22, replacing the anions in the decarbonized effluent with hydroxide ions to produce primary demineralized water. Finally, the primary demineralized water undergoes mixed ion exchange treatment in mixed ion exchange unit 23, further removing the residual anions and cations in the primary demineralized water to produce boiler feed water that meets the requirements.

[0041] For example, Figure 2 As shown, in some embodiments, the cation exchange unit 21 includes a first water supply pump 211, a cation exchanger 212, a decarbonization device 213 and a water storage tank 214 arranged in sequence, and the inlet end of the first water supply pump 211 is connected to the outlet end of the pretreatment module 1; the first water supply pump 211 is configured to: transport the ultrafiltration water to the cation exchanger 212; the cation exchanger 212 is configured to: perform cation exchange treatment on the ultrafiltration water; the decarbonization device 213 is configured to: decarbonize the effluent after the cation exchange treatment to obtain the decarbonized effluent; the water storage tank 214 is configured to: store the decarbonized effluent.

[0042] For details, please see Figure 2 ,from Figure 2 It can be seen that the inlet end of the first water supply pump 211 is connected to the outlet end of the ultrafiltration water tank 122 in the pretreatment module 1, and can transport the ultrafiltration water in the ultrafiltration water tank 122 to the cation exchanger 212 for cation exchange treatment, thereby removing most of the cations in the ultrafiltration water.

[0043] Preferably, in some exemplary embodiments, the decarbonization device 213 may include a decarbonization tower (not shown in the figure), and the water storage tank 214 may include an intermediate water tank (not shown in the figure). Thus, by decarbonizing the effluent after the cation exchange treatment through the decarbonization tower, carbon dioxide in the effluent after the cation exchange treatment can be efficiently removed; by storing the decarbonized effluent in the intermediate water tank, the output flow rate and quality of the decarbonized effluent can be stabilized.

[0044] For example, Figure 2 As shown, in some embodiments, the anion exchange unit 22 includes a second water supply pump 221 and an anion exchanger 222 arranged in sequence, and the inlet end of the second water supply pump 221 is connected to the outlet end of the cation exchange unit 21; the second water supply pump 221 is configured to: transport the decarbonized effluent to the anion exchanger 222; the anion exchanger 222 is configured to: perform anion exchange treatment on the decarbonized effluent to obtain the primary desalted water.

[0045] For details, please see Figure 2 ,from Figure 2 It can be seen that the inlet end of the second water supply pump 221 is connected to the outlet end of the water tank 214 in the cation exchange unit 21, and can transport the decarbonized effluent in the water tank 214 to the anion exchanger 222 for anion exchange treatment, thereby removing most of the anions in the decarbonized effluent.

[0046] For example, Figure 2 As shown, in some embodiments, the mixed ion exchange unit 23 includes a mixed ion exchanger 231 and a desalted water tank 232 arranged in sequence, and the inlet end of the mixed ion exchanger 231 is connected to the outlet end of the anion exchange unit 22; the mixed ion exchanger 231 is configured to: perform mixed ion exchange treatment on the first-level desalted water to obtain the boiler feed water; the desalted water tank 232 is configured to: store the boiler feed water.

[0047] For further information, please see Figure 2 ,from Figure 2It can be seen that in some embodiments, the treatment system further includes a resin regeneration waste liquid collection module 3, which includes an acid collection device 31 and an alkaline liquid collection device 32. The acid collection device 31 is connected to both the cation exchange unit 21 and the mixed ion exchange unit 23, and the alkaline liquid collection device 32 is connected to both the anion exchange unit 22 and the mixed ion exchange unit 23. The acid collection device 31 is configured to collect the acidic regeneration waste liquid from the cation exchange unit 21 and the mixed ion exchange unit 23; the alkaline liquid collection device 32 is configured to collect the alkaline regeneration waste liquid from the anion exchange unit 22 and the mixed ion exchange unit 23. Thus, the acid and alkaline waste liquids generated in the treatment system are collected separately by the resin regeneration waste liquid collection module 3, and the collected acid and alkaline waste liquids can be used for recycling within the chemical plant, thereby laying a good foundation for achieving near-zero wastewater discharge.

[0048] Specifically, if Figure 2 As shown, the acidic regeneration waste liquid outlet of the cation exchanger 212 in the cation exchange unit 21 and the acidic regeneration waste liquid outlet of the mixed ion exchanger 231 in the mixed ion exchange unit 23 are both connected to the acid liquid collecting device 31, which can transport the acidic regeneration waste liquid generated by the cation exchanger 212 and the mixed ion exchanger 231 to the acid liquid collecting device 31 for collection; the alkaline regeneration waste liquid outlet of the anion exchanger 222 in the anion exchange unit 22 and the alkaline regeneration waste liquid outlet of the mixed ion exchanger 231 in the mixed ion exchange unit 23 are both connected to the alkaline liquid collecting device 32, which can transport the alkaline regeneration waste liquid generated by the anion exchanger 222 and the mixed ion exchanger 231 to the alkaline liquid collecting device 32 for collection.

[0049] Please continue to see Figure 2 ,from Figure 2It can be seen that in some exemplary embodiments, the treatment system further includes a flushing wastewater collection and treatment module 4, which includes a flushing wastewater collection device 41, a first delivery pump 42, a sedimentation device 43, and a second delivery pump 44 arranged in sequence. The flushing wastewater collection device 41 is connected to both the ceramic ultrafiltration device 121 and the ion exchange module 2, the sedimentation device 43 is connected to a sludge treatment device 45, and the output end of the second delivery pump 44 is connected to the inlet end of the flocculation device 111; the flushing wastewater collection device 41 is configured to: collect The concentrated water and backwash water output by the ceramic ultrafiltration device 121 and the forward and backwash drainage output by the ion exchange module 2 are collected; the first delivery pump 42 is configured to: deliver the flushing wastewater in the flushing wastewater collection device 41 to the sedimentation device 43; the sedimentation device 43 is configured to: perform flocculation and sedimentation treatment on the received flushing wastewater to obtain supernatant and sludge; the second delivery pump 44 is configured to: deliver the supernatant to the inlet end of the flocculation device 111; the sludge treatment device 45 is configured to: collect the sludge and perform sludge discharge treatment. Thus, the concentrated water and backwash water output by the ceramic ultrafiltration device 121 and the forward and backwash drainage output by the ion exchange module 2 are first collected by the flushing wastewater collection device 41. The collected flushing wastewater is then transported to the sedimentation device 43 by the first delivery pump 42. The sedimentation device 43 performs flocculation and sedimentation treatment on the received flushing wastewater, which can improve the water quality of the flushing wastewater and obtain a supernatant. Finally, the supernatant is transported to the inlet of the flocculation device 111 by the second delivery pump 44, thereby improving the water resource recovery rate of the system. Furthermore, the sludge generated in the sedimentation device 43 is collected and discharged by the sludge treatment device 45, which can effectively protect the environment.

[0050] For example, in some embodiments, the sedimentation device 43 may include an inclined tube sedimentation tank (not shown in the figure), and by adding flocculants and coagulants into the inclined tube sedimentation tank, the suspended particles in the flushing wastewater can be quickly aggregated and precipitated.

[0051] For example, in some embodiments, the sludge treatment device 45 may include a sludge tank (not shown in the figure) for collecting the sludge generated in the sedimentation device 43 and a sludge delivery pump (not shown in the figure) for discharging the sludge.

[0052] It should be noted that, as those skilled in the art can understand, the forward and backwash wastewater output by the ion exchange module 2 includes forward wash water and backwash water of the cation exchanger 212 , the anion exchanger 222 and the mixed ion exchanger 231 .

[0053] Example 2

[0054] This embodiment provides a method for treating boiler feed water, wherein the boiler feed water treatment system described in any of the above embodiments is used to treat boiler raw water to obtain the boiler feed water. Figure 3 , Figure 3 The flow chart of the boiler feed water treatment method provided in this embodiment is as follows. Figure 3 It can be seen that the processing method includes:

[0055] S100: Use ceramic ultrafiltration membrane to ultrafilter boiler raw water to obtain ultrafiltration water;

[0056] S200: performing ion exchange treatment on the ultrafiltration water to obtain boiler feed water.

[0057] Since the boiler feed water treatment method provided in this embodiment and the boiler feed water treatment system provided in any of the above-mentioned embodiments belong to the same inventive concept, the boiler feed water treatment method provided in this embodiment has at least all the advantages of the boiler feed water treatment systems provided in the above-mentioned embodiments. For the advantages of the boiler feed water treatment method provided in this embodiment, please refer to the relevant description of the beneficial effects of the boiler feed water treatment systems provided in the above-mentioned embodiments, which will not be repeated here.

[0058] In order to better understand the present invention, please refer to Figures 1 to 3 The following describes the boiler feed water treatment method provided by the present invention, taking the surface water treatment process as an example. The surface water quality is: turbidity of about 50 NTU, COD of about 5 mg / L, and TDS of about 130 mg / L.

[0059] First, the surface water is transported to the pretreatment module 1, where it is ultrafiltered using a ceramic ultrafiltration membrane. The ceramic ultrafiltration membrane in the pretreatment module 1 is made of alumina and zirconia, has an operating pressure of approximately 0.2 MPa, and a membrane flux of approximately 160 liters / square meter / hour. The ultrafiltration product water is then transported to the ion exchange module 2 for ion exchange treatment to produce boiler feed water. Furthermore, when treating the surface water, the concentrated water and backwash water output by the ceramic ultrafiltration device 121, as well as the forward and backwash drainage output by the ion exchange module 2, are all transported to the flushing wastewater collection and treatment module 4 for treatment.

[0060] As a result, the turbidity of the ultrafiltration water obtained in the pretreatment module 1 is lower than 0.1NTU, the cleaning frequency of the ceramic ultrafiltration membrane is 3-4 times a year, the regeneration cycle of the ion exchange resin in the ion exchange module 2 is extended by approximately 30%-40%, and the water resource recovery rate of the system is not less than 98%.

[0061] In summary, the boiler feed water treatment system and method provided by the present invention have the following advantages: the boiler feed water treatment system provided by the present invention includes a pretreatment module and an ion exchange module arranged in sequence; the pretreatment module is configured to: use a ceramic ultrafiltration membrane to ultrafiltration treat the boiler raw water to obtain ultrafiltration product water; the ion exchange module is configured to: use ion exchange treatment on the ultrafiltration product water to obtain the boiler feed water. Therefore, the boiler feed water treatment system provided by the present invention, by setting a pretreatment module and using a ceramic ultrafiltration membrane to ultrafiltration treat the boiler raw water, can not only reduce the footprint of the treatment system, but also effectively filter most of the sediment in the boiler raw water, reduce the turbidity of the boiler raw water, thereby reducing the pollution of the subsequent ion exchange module and extending the regeneration cycle of the ion exchange resin in the ion exchange module. Compared with the organic ultrafiltration membrane used in the prior art, the ceramic ultrafiltration membrane used in the present invention has higher oxidation resistance and mechanical strength, can effectively avoid the phenomenon of broken wires, and the equipment operation is more stable and the service life is longer. Furthermore, the ceramic ultrafiltration membrane utilizes a cross-flow filtration method, which offers enhanced pollution resistance and reduces the frequency of chemical cleaning. This not only saves on cleaning chemicals but also reduces the amount of wastewater discharged. Furthermore, by implementing an ion exchange module to treat the ultrafiltration water, anions and cations can be effectively removed from the water, producing boiler feed water that meets the requirements.

[0062] Since the boiler feed water treatment method provided by the present invention and the boiler feed water treatment system provided by the present invention belong to the same inventive concept, the boiler feed water treatment method provided by the present invention has at least all the advantages of the boiler feed water treatment system provided by the present invention. For the advantages of the boiler feed water treatment method provided by the present invention, please refer to the relevant description of the beneficial effects of the boiler feed water treatment system provided by the present invention, which will not be repeated here.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A boiler feed water treatment system, characterized in that: The treatment system includes a pretreatment module and an ion exchange module arranged in sequence; The pretreatment module is configured to: perform ultrafiltration treatment on boiler raw water using a ceramic ultrafiltration membrane to obtain ultrafiltration product water; The ion exchange module is configured to perform ion exchange treatment on the ultrafiltration water to obtain the boiler feed water.

2. The boiler feed water treatment system according to claim 1, wherein: The pretreatment module includes a filtration unit and a ceramic ultrafiltration unit arranged in sequence; the filtration unit includes a flocculation device and a filtration device arranged in sequence, and the ceramic ultrafiltration unit includes a ceramic ultrafiltration device and an ultrafiltration water production tank arranged in sequence, and the inlet end of the ceramic ultrafiltration device is connected to the outlet end of the filtration device; The flocculation device is configured to: perform flocculation treatment on the boiler raw water; The filtering device is configured to: filter the boiler raw water to obtain filtered water; The ceramic ultrafiltration device is configured to: perform ultrafiltration treatment on the filtered water using a ceramic ultrafiltration membrane to obtain the ultrafiltration product water; The ultrafiltration water production tank is configured to store the ultrafiltration water production.

3. The boiler feed water treatment system according to claim 2, wherein: The ceramic ultrafiltration unit also includes an ultrafiltration backwash pump connected to the outlet of the ultrafiltration water production tank, and the outlet of the ultrafiltration backwash pump is connected to the water production end of the ceramic ultrafiltration device; the ultrafiltration backwash pump is configured to: transport a portion of the ultrafiltration water production to the interior of the ceramic ultrafiltration device to backwash the ceramic ultrafiltration device.

4. The boiler feed water treatment system according to claim 2, wherein: The ion exchange module includes a cation exchange unit, an anion exchange unit and a mixed ion exchange unit arranged in sequence, and the inlet end of the cation exchange unit is connected to the outlet end of the ceramic ultrafiltration unit; The cation exchange unit is configured to: sequentially perform cation exchange treatment and decarbonization treatment on the ultrafiltration product water to obtain decarbonized effluent; The anion exchange unit is configured to: perform anion exchange treatment on the decarbonized effluent to obtain primary demineralized water; The mixed ion exchange unit is configured to perform mixed ion exchange treatment on the primary desalted water to obtain the boiler feed water.

5. The boiler feed water treatment system according to claim 4, characterized in that: The cation exchange unit includes a first water supply pump, a cation exchanger, a decarbonization device and a water storage tank arranged in sequence, and the inlet end of the first water supply pump is connected to the outlet end of the pretreatment module; The first water supply pump is configured to: deliver the ultrafiltration product water to the cation exchanger; The cation exchanger is configured to: perform cation exchange treatment on the ultrafiltration water; The decarbonization device is configured to: decarbonize the effluent after the cation exchange treatment to obtain the decarbonized effluent; The water storage tank is configured to store the decarbonized water.

6. The boiler feed water treatment system according to claim 4, wherein: The anion exchange unit includes a second water supply pump and an anion exchanger arranged in sequence, and the inlet end of the second water supply pump is connected to the outlet end of the cation exchange unit; The second water supply pump is configured to: deliver the decarbonized effluent to the anion exchanger; The anion exchanger is configured to perform anion exchange treatment on the decarbonized effluent to obtain the primary desalted water.

7. The boiler feed water treatment system according to claim 4, wherein: The mixed ion exchange unit comprises a mixed ion exchanger and a desalted water tank arranged in sequence, wherein the inlet end of the mixed ion exchanger is connected to the outlet end of the anion exchange unit; The mixed ion exchanger is configured to: perform mixed ion exchange treatment on the primary desalted water to obtain the boiler feed water; The desalted water tank is configured to store the boiler feed water.

8. The boiler feed water treatment system according to claim 4, wherein: The treatment system also includes a resin regeneration waste liquid collection module, which includes an acid collection device and an alkali collection device, wherein the acid collection device is connected to both the cation exchange unit and the mixed ion exchange unit, and the alkali collection device is connected to both the anion exchange unit and the mixed ion exchange unit; The acid liquid collection device is configured to: collect the acidic regeneration waste liquid of the cation exchange unit and the mixed ion exchange unit; The alkaline solution collecting device is configured to collect the alkaline regeneration waste liquid of the anion exchange unit and the mixed ion exchange unit.

9. The boiler feed water treatment system according to claim 3, wherein: The treatment system also includes a flushing wastewater collection and treatment module, which includes a flushing wastewater collection device, a first delivery pump, a sedimentation device, and a second delivery pump arranged in sequence. The flushing wastewater collection device is connected to both the ceramic ultrafiltration device and the ion exchange module. The sedimentation device is connected to a sludge treatment device, and the output end of the second delivery pump is connected to the inlet end of the flocculation device. The flushing wastewater collection device is configured to collect concentrated water and backwash water output by the ceramic ultrafiltration device and forward and backwash drainage output by the ion exchange module; The first delivery pump is configured to: deliver the flushing wastewater in the flushing wastewater collecting device to the sedimentation device; The sedimentation device is configured to: perform flocculation and sedimentation treatment on the received flushing wastewater to obtain a supernatant and sludge; The second delivery pump is configured to: deliver the supernatant to the inlet end of the flocculation device; The sludge treatment device is configured to collect the sludge and perform sludge discharge treatment.

10. A method for treating boiler feed water, characterized in that: The boiler feed water treatment system according to any one of claims 1 to 9 is used to treat boiler raw water to obtain the boiler feed water, wherein the treatment method comprises: Use ceramic ultrafiltration membrane to ultrafilter the boiler raw water to obtain ultrafiltration water; The ultrafiltration water is subjected to ion exchange treatment to obtain boiler feed water.

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