Desalted water device transformation process

Abstract

The invention provides a desalting water device transformation process, and relates to the technical field of desalting water device transformation. According to the transformation process, on-site wastewater discharge is reduced, and the water treatment capacity of companies is reduced; the mixed bed regeneration frequency is reduced, the water production rate of the system is improved, the industrial water consumption is reduced, the concentrated water reverse osmosis membrane chemical cleaning frequency is reduced, the cleaning wastewater discharge amount is reduced, the device operation life is prolonged, the reverse osmosis membrane desalination rate attenuation is delayed, the first-stage process and turbine condensation pump operation power consumption is reduced, the system pollution and blockage are reduced, and the field leakage points are reduced. And the transformation process can ensure the production safety, the devices can be mutually standby, the water production safety is ensured, the normal supply of desalted water of a company is ensured, the transformation cost is low, and the return period is short.

Description

Technical Field

[0001] The invention relates to the technical field of desalination water device transformation, and in particular to a desalination water device transformation process. Background Art

[0002] Desalination water device is a device used to produce desalted water. It is widely used in the industrial field, mainly to provide production water for boilers.

[0003] The desalination equipment used by our company is built in two phases. The first phase has a designed desalination capacity of 600t / h, 145t / h of turbine condensate is recovered and treated, and 160t / h of process condensate is recovered and treated. The water quality standard of the desalted water after system treatment is hardness ≈ 0μmol / L, SiO2 ≤ 20μg / L, and conductivity ≤ 0.3μs / cm (25℃). The water production process is ultrafiltration + primary reverse osmosis + mixed bed. The second phase has a designed desalination capacity of 600t / h, 210t / h of turbine condensate is treated and recovered, and 510t / h of process condensate is treated and recovered. The water quality standard of the desalted water after system treatment is hardness ≈ 0μmol / L, SiO2 ≤ 20μg / L, and conductivity ≤ 0.2μs / cm (25℃). The water production process is ultrafiltration + secondary reverse osmosis + EDI process (full membrane method). 46m of concentrated water discharged from the first phase 3 / h; Second-stage concentrated water discharge 40m 3 / h, with a total of 86m3 of concentrated water discharged 3 / h; the dissolved solids of the concentrated water reverse osmosis drainage are 1900-2000mg / l. The discharged concentrated water is sent to the concentrated water collection tank through the DN200 concentrated water overhead drainage pipe and drainage ditch, and then sent to the sewage treatment station through the concentrated water drainage pump.

[0004] Current desalination devices usually have the following defects after being used for a period of time:

[0005] The average conductivity of the water produced by the first-phase reverse osmosis system is relatively high (20us / cm), resulting in a large amount of wastewater (neutralized water) generated each time the mixed bed is regenerated; the concentrated water reverse osmosis membrane is seriously blocked; the utilization rate of the second-phase condensate system is low; the reverse osmosis membrane needs to be frequently soaked and cleaned with acid and alkali agents, and each cleaning will damage the membrane elements and cause a decrease in the desalination rate, affecting the service life of the reverse osmosis membrane; the reduction in desalination rate seriously affects the subsequent mixed bed cycle water production, the mixed bed is frequently regenerated, the acid and alkali consumption is high, and the regeneration wastewater discharge is large.

[0006] Therefore, it is necessary to transform the desalination water device that has been used for a period of time. The existing transformation process has the disadvantages of large investment and long payback period. Summary of the invention

[0007] In view of the deficiencies of the prior art, the present invention provides a desalting water device transformation process, which solves the problems of large investment and long payback period in the desalting water device transformation process.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A desalination device transformation process, the transformation process comprising:

[0010] Replace the reverse osmosis membrane elements with the new BW30XFR-400 / 34 Dow membrane with strong anti-pollution ability; block the three sections of the reverse osmosis membrane in a ratio of 4:2:1; block 4 sections in the first section, 2 sections in the second section, and 1 section in the third section;

[0011] The 62 broken membrane elements of the four sets of ultrafiltration membranes were removed, and the 62 unbroken membranes were removed from the first ultrafiltration membrane and added to the other three sets of membranes. 62 ultrafiltration membranes were purchased and installed on the first ultrafiltration membrane.

[0012] Preferably, the transformation process includes: piping to send the water produced by the first-stage reverse osmosis membrane directly to the primary fresh water tank of the second-stage desalination device; piping to add a plate heat exchanger.

[0013] Preferably, the transformation process includes: piping from the outlet of the second-stage desalted water antiscalant pump to the inlet flange nipple of the concentrated water reverse osmosis membrane security filter, and adding reverse osmosis antiscalant from the nipple.

[0014] Preferably, the transformation process includes: extending the first-stage process condensate pipe and the turbine condensate pipe, and piping them into the second-stage condensate water tank.

[0015] Preferably, the transformation process comprises: connecting the refined mixed bed and the mixed bed water inlet main pipe, and installing a valve on the added connecting pipe.

[0016] Preferably, the transformation process includes: setting up an online cleaning device in the first-phase desalted water pump room; setting up a protective liquid storage device for the spare reverse osmosis membrane; and configuring connecting pipes such as flushing water required for offline cleaning.

[0017] Preferably, the transformation process includes: the PH value of the drainage from the first-phase and second-phase integrated purifiers is monitored at 6.96-9.6 for 12 hours and diverted to the emergency water pool; an online PH meter is added to the neutralization ditch at the inlet of the neutralization water pool, and the signal is introduced into the DCS, so that the operator can monitor the changes in the PH value of the wastewater; an acid and alkali addition point is set in front of the newly added online PH meter at the inlet of the neutralization water pool; the newly added online PH meter and the acid and alkali addition valve are automatically controlled; the operator monitors the amount of acid and alkali added according to the PH value of the wastewater discharged in the regeneration operation step; and the PH value of the water entering the neutralization water pool is adjusted to 6-9 by monitoring the changes in the PH meter.

[0018] Preferably, the transformation process includes: modifying the resins loaded in the three refined mixed beds of the first phase desalination unit, using D003NJ uniform particle cation resin and D203NJ uniform particle anion resin for loading; the loading ratio of D003NJ uniform particle cation resin and D203NJ uniform particle anion resin is 1:1.

[0019] Preferably, the transformation process includes: designing and adding a set of brine reverse osmosis equipment in the area of ​​the original brine collection pool; the brine from the original brine collection pool is sent to the newly added brine reverse osmosis equipment through the existing brine drainage pump, and the treated qualified fresh water enters the first-phase ultrafiltration water tank to be recycled as raw water, and the brine is pressurized by the brine pipeline booster pump and sent to the sewage treatment station.

[0020] Preferably, the transformation process includes: adding a non-oxidizing fungicide addition system on-site in the first and second phases.

[0021] The present invention provides a desalination water device transformation process. Compared with the prior art, it has the following beneficial effects:

[0022] In the present invention, the transformation process reduces on-site wastewater discharge and reduces the company's water treatment volume; reduces the number of mixed bed regeneration times, improves the system's water production rate, saves industrial water consumption, reduces the number of concentrated water reverse osmosis membrane chemical cleaning times, reduces the amount of cleaning wastewater discharged, extends the operating life of the device, delays the attenuation of the reverse osmosis membrane desalination rate, saves power consumption of the first-phase process and turbine condensation pump, reduces system fouling, reduces on-site leakage points, and saves the number of membrane elements to be filled. The transformation process can ensure production safety, the devices can serve as backup for each other, ensure water production safety, ensure the normal supply of desalted water for the company, and have low transformation costs and a short payback period. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The embodiment of the present application solves the problem by providing a desalination water device transformation process.

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0026] Example:

[0027] The present invention provides a desalination device transformation process, the transformation process comprising:

[0028] Piping is used to send the water produced by the first-stage reverse osmosis membrane directly to the primary fresh water tank of the second-stage desalination unit;

[0029] The pipes are equipped with plate heat exchangers;

[0030] From the outlet pipe of the second-stage desalted water antiscalant pump to the inlet flange nipple of the concentrated water reverse osmosis membrane security filter, add the reverse osmosis antiscalant from the nipple;

[0031] Extend the first-stage process condensate pipe and turbine condensate pipe, and pipe them into the second-stage condensate water tank;

[0032] Connect the refined mixed bed and the mixed bed water inlet main pipe, and install valves on the added connecting pipe to achieve independent operation and mutual backup;

[0033] An online cleaning device is installed in the first phase desalted water pump room; a protective liquid storage device for the backup reverse osmosis membrane is installed; and connecting pipes such as flushing water required for offline cleaning are configured;

[0034] Add non-oxidizing fungicide addition system on site in Phase I and Phase II:

[0035] The 12-hour monitoring of the effluent pH of the integrated purifiers of the first and second phases was 6.96-9.6, which was relatively stable and was diverted to the emergency pool;

[0036] An online pH meter is added to the neutralization ditch at the inlet of the neutralization pool, and the signal is introduced into the DCS, which is convenient for operators to monitor the changes in the pH of the wastewater; acid and alkali addition points are set in front of the newly added online pH meter at the inlet of the neutralization pool; the newly added online pH meter and the acid and alkali addition valve are automatically controlled; the operator monitors the amount of acid and alkali added according to the pH of the wastewater discharged in the regeneration operation steps; by monitoring the changes in the pH meter, the pH of the water added to the neutralization pool is adjusted to 6-9;

[0037] Replace the reverse osmosis membrane elements with the new BW30XFR-400 / 34 Dow membrane with strong anti-pollution ability; block the three sections of the reverse osmosis membrane in a ratio of 4:2:1; block 4 sections in the first section, 2 sections in the second section, and 1 section in the third section;

[0038] Remove the 62 broken membrane elements from the four sets of ultrafiltration membranes, remove the 62 broken membrane elements from the first ultrafiltration membrane and add them to the other three sets of membranes, and purchase 62 ultrafiltration membranes to be installed on the first ultrafiltration membrane;

[0039] The resins loaded in the three refined mixed beds of the first phase desalination unit were modified to use D003NJ uniform particle cation resin and D203NJ uniform particle anion resin; the loading ratio of D003NJ uniform particle cation resin and D203NJ uniform particle anion resin was 1:1;

[0040] A set of concentrated water reverse osmosis device is designed to be added in the original concentrated water collection pool area, with a concentrated water inlet of 150m 3 / h, with a recovery rate of 50%; the brine from the original brine collection pool is sent to the newly added brine reverse osmosis device through the existing brine drainage pump, and the qualified fresh water after treatment enters the first-phase ultrafiltration water tank to be recycled as raw water. The brine is pressurized by the brine pipeline booster pump and then sent to the sewage treatment station.

[0041] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. In the embodiment of the present invention, the transformation process reduces on-site wastewater discharge and the company's water treatment volume; it is estimated that the number of mixed bed regenerations can be reduced by 40 times. Based on the calculation that 300 tons of wastewater is generated per regeneration, 10,000 tons of wastewater can be discharged less per month, saving the company 120,000 yuan in wastewater treatment costs throughout the year; the water production rate of the system is improved, saving industrial water consumption.

[0043] 2. In the embodiment of the present invention, the transformation process saves about 22,778 tons of 9.8 MPa steam per year; the cost of 9.8 MPa steam is calculated at 125 yuan; the cost saved throughout the year = 22,778 tons of steam * 125 yuan / ton of steam = about 2 million yuan.

[0044] 3. In the embodiment of the present invention, the transformation process reduces the number of times the concentrated water reverse osmosis membrane is chemically cleaned, reduces the amount of cleaning wastewater discharged, extends the operating life of the device, and delays the attenuation of the reverse osmosis membrane desalination rate.

[0045] 4. In the embodiment of the present invention, the transformation process saves the power consumption of the first-phase process and the turbine condensing pump. The estimated daily power saving benefit = 2*20 kWh / hour*24 = 960 kWh, the estimated annual power saving benefit = 960*300 = 288,000 kWh, and the annual cost saving is approximately = 288,000 kWh*0.55 yuan = 158,400 yuan.

[0046] 5. In the embodiment of the present invention, the transformation process can ensure production safety and the devices can serve as backup for each other.

[0047] 6. In the embodiment of the present invention, the offline cleaning of the modified process can extend the service life of the reverse osmosis membrane element by 1 year; from the original 4 years to 5 years, based on the calculation of about 800,000 yuan for a set of membrane elements, the purchase cost can be reduced by 9 sets of membranes * [(80 / 4)-(80 / 5)] = 360,000 yuan one year after commissioning; the desalination rate attenuation of the reverse osmosis membrane element is slowed down, and the discharge of regenerated wastewater in the subsequent mixed bed process is reduced.

[0048] 7. In the embodiment of the present invention, the transformation process reduces system blockage, reduces the number of system chemical cleaning times, ensures the system water production load; saves chemical cleaning agents; reduces the damage of chemical cleaning to the reverse osmosis membrane, and slows down the attenuation rate of the reverse osmosis membrane desalination rate.

[0049] 8. In the embodiment of the present invention, the transformation process reduces on-site leakage points and improves the production site environment; reduces the cost of maintenance and leakage elimination, reduces maintenance costs, and saves energy and reduces consumption; the cost of scaffolding for each maintenance = 1,000 yuan, calculated based on 2 maintenances per month, the annual scaffolding cost savings = 12 months * 2 times / month * 1,000 yuan / time = 24,000 yuan; saves the cost of replacing materials for neutralizing water pipes, calculated based on replacing the neutralizing water pipes once every two years, the replacement length is about 500 meters, and the annual material cost savings are about 100,000 yuan; recovers about 500-1,000 tons / day of neutralizing water for reuse.

[0050] 9. In the embodiment of the present invention, the transformation process saves the number of membrane elements to be filled, 42 membrane elements are less to be filled, and the cost is saved = 42*4050 = 170,100 yuan. After being put into operation, 5 regenerations are reduced per month, and 5*350 = 1,750 tons of wastewater are reduced per month, and 10 tons of acid and 10 tons of alkali are saved per month.

[0051] 10. In the embodiment of the present invention, the transformation process ensures the safety of water production and the normal supply of desalted water of the company; after commissioning, it is estimated that one less ultrafiltration system can meet the water production requirements, one less raw water pump can be operated, and electricity consumption can be saved. The raw water pump motor is 45kw, and the estimated electricity consumption per hour is = 45*0.6 = 27 kWh, and the annual electricity saving benefit is estimated = 27 kWh / hour * 24 hours * 360 days * 0.55 yuan / kWh = 128304; in addition, one less ultrafiltration membrane can save wastewater discharge and the use of acid and hyposodium.

[0052] 11. In the embodiment of the present invention, the transformation process estimates that a single refined mixed bed can be regenerated 8 times less per month, which can save 8*2=16 tons of acid and 8*2=16 tons of alkali; three refined mixed beds can save 600 tons of acid and 600 tons of alkali throughout the year, and reduce the discharge of 50,000 tons of wastewater; acid cost saving = 600 yuan / ton*610 tons=366,000 yuan; alkali cost saving = 600 yuan / ton*430 tons=258,000 yuan; industrial water cost saving = 2 yuan / ton*50,000 tons=100,000 yuan; annual cost saving = 366,000+258,000+10=724,000 yuan.

[0053] 12. In the embodiment of the present invention, the transformation process saves 50 tons of raw water per hour, and the cost = 50 tons of water * 2 yuan / ton of water = 100 yuan; the cost of raw water saved is calculated based on 330 days per year = 330 days * 24 hours * 100 yuan / hour = 792,000 yuan; the cost of wastewater discharge treatment is saved, and the direct discharge cost is calculated at 4 yuan / ton. The cost of wastewater discharge treatment is saved based on 330 days per year = 330 days * 24 hours * 50 * 4 yuan / hour = 1,584,000 Yuan; main operating costs: concentrated water pump and concentrated water reverse osmosis pump motor power = 45kw + 150kw = 195kw; annual operating power consumption calculated as 330 days = 330 days * 24 hours * 195kw / hour * 0.6 yuan / kwh = 926640 yuan; total annual cost savings = 792000 + 1584000-926640 = 1449360 yuan; investment payback period = 2000000 / 1449360 = 1.38 years.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A desalted water device transformation process, characterized in that: The transformation process comprises: Replace the reverse osmosis membrane elements with the new BW30XFR-400 / 34 Dow membrane with strong anti-pollution ability; block the three sections of the reverse osmosis membrane in a ratio of 4:2:1; block 4 sections in the first section, 2 sections in the second section, and 1 section in the third section; The 62 broken membrane elements of the four sets of ultrafiltration membranes were removed, and the 62 unbroken membranes were removed from the first ultrafiltration membrane and added to the other three sets of membranes. 62 ultrafiltration membranes were purchased and installed on the first ultrafiltration membrane.

2. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: piping to send the water produced by the first-stage reverse osmosis membrane directly to the primary fresh water tank of the second-stage desalination device; piping to add a plate heat exchanger.

3. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: piping from the outlet of the second-stage desalted water antiscalant pump to the inlet flange short section of the concentrated water reverse osmosis membrane security filter, and adding the reverse osmosis antiscalant from the short section.

4. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: extending the first-stage process condensate pipe and the turbine condensate pipe, and piping them into the second-stage condensate water tank.

5. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: connecting the refined mixed bed and the mixed bed water inlet main pipe, and installing a valve on the added connecting pipe.

6. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: setting up an online cleaning device in the first-phase desalted water pump room; setting up a protective liquid storage device for the spare reverse osmosis membrane; and configuring connecting pipes such as flushing water required for offline cleaning.

7. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: the pH of the drainage from the first-phase and second-phase integrated purifiers is monitored at 6.96-9.6 for 12 hours and diverted to the emergency water pool; an online pH meter is added to the neutralization ditch at the inlet of the neutralization water pool, and the signal is introduced into the DCS, so that the operator can monitor the changes in the pH of the wastewater; an acid and alkali addition point is set in front of the newly added online pH meter at the inlet of the neutralization water pool; the newly added online pH meter and the acid and alkali addition valve are automatically controlled; the operator monitors the amount of acid and alkali added according to the pH of the wastewater discharged in the regeneration operation step; and by monitoring the changes in the pH meter, the pH of the water added to the neutralization water pool is adjusted to 6-9.

8. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: modifying the resins loaded in three refined mixed beds of the first-phase desalination unit, using D003NJ uniform particle cation resin and D203NJ uniform particle anion resin for loading; the loading ratio of D003NJ uniform particle cation resin and D203NJ uniform particle anion resin is 1:

1.

9. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: designing and adding a set of brine reverse osmosis equipment in the original brine collection pool area; the brine in the original brine collection pool is sent to the newly added brine reverse osmosis equipment through the existing brine drainage pump, and the treated qualified fresh water enters the first-phase ultrafiltration water tank to be recycled as raw water, and the brine is pressurized by the brine pipeline booster pump and sent to the sewage treatment station.

10. The desalination water device transformation process according to claim 1, characterized in that: The transformation process includes: adding a non-oxidizing fungicide addition system on site in the first and second phases.