CN113087270A - Inferior coal demineralized water pretreatment systems - Google Patents
Inferior coal demineralized water pretreatment systems Download PDFInfo
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- CN113087270A CN113087270A CN202110499469.4A CN202110499469A CN113087270A CN 113087270 A CN113087270 A CN 113087270A CN 202110499469 A CN202110499469 A CN 202110499469A CN 113087270 A CN113087270 A CN 113087270A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 246
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 77
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 37
- 238000011001 backwashing Methods 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000011033 desalting Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the field of industrial feedwater treatment, and particularly relates to a low-grade coal desalted water pretreatment system. The problem of current faulty coal demineralized water pretreatment equipment's trouble many, maintenance work load is big and PLC control stability is poor is solved, technical scheme is: the system comprises an inferior coal desalted water pretreatment device and a sequential control system, wherein the inferior coal desalted water pretreatment device comprises a raw water pool, a raw water lift pump, a heat exchanger, a plurality of multi-media filters, a plurality of ultrafiltration systems, an ultrafiltration water production pool, an ultrafiltration water pump, a reverse osmosis system, a middle water pool, a reverse osmosis concentrated water pool, a multi-media filter backwashing water pump and an ultrafiltration backwashing water pump, and the sequential control system comprises a sequential control selection unit, a logic control unit, a condition judgment unit, a queuing control unit, a fault feedback unit and a sequential control system external interface.
Description
Technical Field
The invention belongs to the field of industrial feedwater treatment, and particularly relates to a low-grade coal desalted water pretreatment system.
Background
In recent years, the inferior coal utilization device is constructed in China, as a desalting water pretreatment device, most of operation units are controlled by a PLC (programmable logic controller) or operated by intermittent manual operation to realize water production, the operation of personnel is frequent, a PLC control program is prone to failure, the operation mode of each unit is unreasonable, and the stability and the safety guarantee of the device are poor. The plate heat exchanger, the multi-medium filter and the ultrafiltration system have the disadvantages of more operation faults, large maintenance workload, inaccurate backwashing time control, water resource waste and high production and operation cost.
Disclosure of Invention
The invention aims to solve the technical problems of multiple faults, large maintenance workload and poor PLC control stability of the existing low-grade coal desalted water pretreatment equipment and provides a low-grade coal desalted water pretreatment system.
In order to solve the technical problems, the invention adopts the technical scheme that:
a low-grade coal desalting water pretreatment system comprises a low-grade coal desalting water pretreatment device and a sequential control system, wherein the low-grade coal desalting water pretreatment device comprises a raw water tank, a raw water lift pump, a heat exchanger, a plurality of multi-media filters, a plurality of ultrafiltration systems, an ultrafiltration product water tank, an ultrafiltration water pump, a reverse osmosis system, an intermediate water tank, a reverse osmosis concentrated water tank, a multi-media filter backwashing water pump and an ultrafiltration backwashing water pump, a water outlet of the raw water tank is connected with a water inlet of the raw water lift pump through a pipeline, a water outlet of the raw water lift pump is connected with a water inlet of the heat exchanger, a water outlet of the heat exchanger is connected with water inlets of the plurality of multi-media filters, the plurality of multi-media filters are connected in parallel, water outlets of the plurality of multi-media filters are respectively connected with water inlets of the, the water outlets of the plurality of ultrafiltration systems are all connected with the water inlet of an ultrafiltration water generating tank, the water outlet of the ultrafiltration water generating tank is connected with the water inlet of an ultrafiltration water pump, the water outlet of the ultrafiltration water pump is connected with the water inlet of a reverse osmosis system, the water outlet of the reverse osmosis system is connected with the water inlet of an intermediate water tank, the water outlet of the intermediate water tank is connected with a mixed bed system, the other water outlet of the ultrafiltration water generating tank is connected with the water inlet of an ultrafiltration backwashing water pump, the water outlet of the ultrafiltration backwashing water pump is connected with the water outlets of the plurality of ultrafiltration systems, the other water outlet of the reverse osmosis system is connected with the water inlet of a reverse osmosis concentrated water tank and a concentrated water discharge tank, the water outlet of the reverse osmosis concentrated water tank is connected with the water inlet of a multi-media filter, the other water outlets of the plurality of multi-medium filters and the ultrafiltration system are connected to a backwashing drainage pool;
the tank tops of the raw water tank, the ultrafiltration water production tank and the intermediate water tank are all provided with liquid level meters, pipelines of water outlets are provided with a pressure meter and a thermometer, the water outlets of the plurality of multi-medium filters are all provided with turbidity sensors, and the water outlets of the plurality of ultrafiltration systems and the reverse osmosis systems are all provided with concentration sensors;
the sequence control system comprises a sequence control selection unit, a logic control unit, a condition judgment unit, a queuing control unit, a fault feedback unit and a sequence control system external interface, wherein the output end of the sequence control selection unit is connected with the input end of the logic control unit, the output end of the logic control unit is connected with the input end of the condition judgment unit, the queuing control unit is connected with the fault feedback unit, the output ends of the logic control unit and the condition judgment unit are connected with the queuing control unit and the fault feedback unit, and the sequence control selection unit, the logic control unit, the condition judgment unit, the queuing control unit and the fault feedback unit are connected with the sequence control system external interface;
and the external interfaces of the sequential control system are respectively and electrically connected with a pressure gauge and a temperature gauge in the raw water pool, the ultrafiltration water production pool and the intermediate water pool, a turbidity sensor in the multi-medium filter, a concentration sensor in the ultrafiltration system and the reverse osmosis system, a raw water lift pump, a heat exchanger and an ultrafiltration water pump.
Further, the heat exchanger is a plate heat exchanger.
Furthermore, the sequence control system also comprises a counting unit, and the counting unit is connected with a connecting line between the logic control unit and the condition judgment unit.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the optimized control of the desalted water pretreatment system, an operator only needs to input the running time on the operation system and select the sequential control equipment to realize automatic running, the automation degree is high, the labor intensity of the operator is greatly reduced, and meanwhile, the back washing can be regularly carried out on the multi-medium filter and the ultrafiltration equipment, the discharge amount of the back washing water is reasonably controlled, and the production cost is reduced.
Drawings
FIG. 1 is a process flow diagram of the device for pretreating the desalted water of the low-grade coal according to the present invention;
FIG. 2 is a schematic diagram of a sequential control system according to the present invention;
FIG. 3 is a schematic diagram of the operation of the sequence control system;
in the figure: 1-raw water pool, 2-raw water lift pump, 3-heat exchanger, 4-multi-medium filter, 5-ultrafiltration system, 6-ultrafiltration water producing pool, 7-ultrafiltration water pump, 8-reverse osmosis system, 9-middle water pool, 10-reverse osmosis concentrated water pool, 11-multi-medium filter backwash water pump, 12-ultrafiltration backwash water pump, 13-sequence control selection unit, 14-logic control unit, 15-condition judgment unit, 16-counting unit, 17-queue control unit, 18-fault feedback unit and 19-sequence control system external interface.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, a low-grade coal desalting water pretreatment system comprises a low-grade coal desalting water pretreatment device and a sequential control system, wherein the low-grade coal desalting water pretreatment device comprises a raw water tank 1, a raw water lift pump 2, a plate heat exchanger 3, 10 multi-media filters 4, 4 ultrafiltration systems 5, an ultrafiltration product water tank 6, an ultrafiltration water pump 7, a reverse osmosis system 8, an intermediate water tank 9, a reverse osmosis concentrated water tank 10, a multi-media filter backwash water pump 11 and an ultrafiltration backwash water pump 12, a water outlet of the raw water tank 1 is connected with a water inlet of the raw water lift pump 2 through a pipeline, a water outlet of the raw water lift pump 2 is connected with a water inlet of the heat exchanger 3, a water outlet of the heat exchanger 3 is connected with water inlets of 10 multi-media filters 4, the 10 multi-media filters 4 are connected in parallel, water outlets of the 10 multi-media filters 4 are respectively connected with water inlets of the, the 4 ultrafiltration systems 5 are connected in parallel, the water outlets of the 4 ultrafiltration systems 5 are all connected with the water inlet of an ultrafiltration water production tank 6, the water outlet of the ultrafiltration water production tank 6 is connected with the water inlet of an ultrafiltration water pump 7, the water outlet of the ultrafiltration water pump 7 is connected with the water inlet of a reverse osmosis system 8, the water outlet of the reverse osmosis system 8 is connected with the water inlet of an intermediate water tank 9, the water outlet of the intermediate water tank 9 is connected with a mixed bed system, the other water outlet of the ultrafiltration water production tank 6 is connected with the water inlet of an ultrafiltration backwashing water pump 12, the water outlet of the ultrafiltration backwashing water pump 12 is connected with the water outlets of the 4 ultrafiltration systems 5, the other water outlet of the reverse osmosis system 8 is connected with the water inlet of a reverse osmosis concentrated water tank 10 and a concentrated water discharge tank, and the water outlet of the, the water outlet of the multi-medium filter backwashing water pump 11 is connected with the water outlets of 10 multi-medium filters 4, and the other water outlets of the multi-medium filters 4 and the ultrafiltration system 5 are both connected to a backwashing drainage pool;
the tank tops of the raw water tank 1, the ultrafiltration water production tank 6 and the middle water tank 9 are all provided with liquid level meters, pipelines of water outlets are provided with a pressure meter and a thermometer, water outlets of the 10 multi-medium filters 4 are all provided with turbidity sensors, and water outlets of the 4 ultrafiltration systems 5 and the reverse osmosis system 8 are all provided with concentration sensors;
as shown in fig. 2, the sequence control system comprises a sequence control selection unit 13, a logic control unit 14, a condition judgment unit 15, a queuing control unit 17, a fault feedback unit 18 and a sequence control system external interface 19, the output end of the sequential control selection unit 13 is connected with the input end of a logic control unit 14, the output end of the logic control unit 14 is connected with the input end of a condition judgment unit 15, the queuing control unit 17 is connected with the failure feedback unit 18, the output ends of the logic control unit 14 and the condition judgment unit 15 are both connected with the queuing control unit 17 and the failure feedback unit 18, the sequence control selection unit 13, the logic control unit 14, the condition judgment unit 15, the queuing control unit 17 and the fault feedback unit 18 are all connected with an external interface 19 of the sequence control system, the sequential control system also comprises a counting unit 16, and the counting unit 16 is connected with a connecting line between the logic control unit 14 and the condition judgment unit 15.
The sequence control system external interface 19 is respectively and electrically connected with a pressure gauge and a thermometer in the raw water pool 1, the ultrafiltration product water pool 6 and the intermediate water pool 9, a turbidity sensor in the multi-medium filter 4, a concentration sensor in the ultrafiltration system 5 and the reverse osmosis system 8, the raw water lift pump 2, the heat exchanger 3 and the ultrafiltration water pump 7.
The working principle of the invention is as follows:
when the device is used, the sequence control system is firstly opened, the running time of each part in the low-quality coal demineralized water pretreatment device is set on a control panel of the system, the sequence control device is selected according to requirements, and then switches of each part of the low-quality coal demineralized water pretreatment device are started;
raw water in a raw water tank 1 enters a plate type heat exchanger 3 through a raw water lifting pump 2, effluent of the plate type heat exchanger 3 enters a multi-medium filter 4, a turbidity sensor in the multi-medium filter 4 receives turbidity of the treated water and feeds turbidity data back to a condition judgment unit 15 of a sequence control system, the sequence control system gives an instruction to the multi-medium filter 4, effluent with the turbidity less than 5 enters an ultrafiltration system 5, most organic matters in the effluent are removed by the ultrafiltration system 5 and then enter an ultrafiltration product water tank 6 through a pipeline, one part of the effluent of the ultrafiltration product water tank 6 is pressurized by an ultrafiltration water pump 7 and enters a reverse osmosis system 8, the other part of the effluent is extracted by an ultrafiltration backwash water pump 12 to serve as backwash water for the ultrafiltration system 5, a concentration sensor in the reverse osmosis system 8 collects signals and transmits the data to the condition judgment unit 15, the sequence control system gives an instruction to the reverse osmosis system 8, and the reverse osmosis system 8 with reduced conductivity gives, 80% of the reverse osmosis concentrated water is discharged through a pipeline, 20% of the concentrated water enters a reverse osmosis concentrated water tank 10, the concentrated water in the reverse osmosis concentrated water tank 10 is pressurized through a multi-media filter backwashing water pump 11 to be used as the backwashing water of a multi-media filter 4, and the effluent water of an intermediate water tank 9 enters a mixed bed system;
in the operation process, the sequence control selection unit 13 is used for automatically selecting the number of running sets and the number of equipment units, the logic control unit 14 is used for realizing sequence control operations such as starting, stopping and resetting of the equipment, the counting unit 16 is used for realizing accumulation of running time of each equipment and device and adjustment and recording of backwashing time, the condition judgment unit 15 is used for realizing sequence control condition judgment, the fault feedback unit 18 is used for realizing a sequence control fault detection feedback function, and the queuing control unit 17 is used for realizing preferential running and backwashing of the system; programming each step of sequence control operation conditions into the logic control unit 14 in advance, comparing the current conditions with the conditions in the logic control unit one by one when the sequence control is operated to the step, realizing by the condition judgment unit, performing the current equipment action after confirming the consistency, keeping waiting and displaying the waiting position on the picture, and realizing by the condition judgment unit 15, wherein the current conditions are inconsistent with the conditions in the logic control unit; when different sequence control programs select the same equipment, according to the principle of 'first-come first-obtained', after the first sequence of sequence control uses the equipment, the second sequence of equipment can be continuously used and is realized by a queuing control unit; according to the invention, through the optimized control of the desalted water pretreatment system, an operator only needs to input the running time on the operation system, and the automatic running can be realized by selecting the sequential control equipment, so that the automation degree is high, the labor intensity of the operator is greatly reduced, and meanwhile, the back washing can be regularly carried out on the multi-medium filter and the ultrafiltration equipment, the discharge amount of the back washing water is reasonably controlled, and the production cost is reduced; when the counting unit 16 detects that the multimedia filter 4 reaches the running period, namely, the running is stopped, the sequential control selection unit 13 selects a backwashing pump and a valve to carry out automatic backwashing operation.
Claims (3)
1. The utility model provides a low grade coal demineralized water pretreatment systems which characterized in that: the device comprises an inferior coal desalting brine pretreatment device and a sequential control system, wherein the inferior coal desalting brine pretreatment device comprises a raw water pool (1), a raw water lift pump (2), a heat exchanger (3), a plurality of multi-media filters (4), a plurality of ultrafiltration systems (5), an ultrafiltration water production pool (6), an ultrafiltration water pump (7), a reverse osmosis system (8), an intermediate water pool (9), a reverse osmosis concentrated water pool (10), a multi-media filter backwashing water pump (11) and an ultrafiltration backwashing water pump (12), wherein a water outlet of the raw water pool (1) is connected with a water inlet of the raw water lift pump (2) through a pipeline, a water outlet of the raw water lift pump (2) is connected with a water inlet of the heat exchanger (3), a water outlet of the heat exchanger (3) is connected with water inlets of the plurality of multi-media filters (4), and the plurality of multi-media filters (4, the water outlets of the plurality of multi-media filters (4) are respectively connected with the water inlets of the plurality of ultrafiltration systems (5), the plurality of ultrafiltration systems (5) are connected in parallel, the water outlets of the plurality of ultrafiltration systems (5) are all connected with the water inlet of an ultrafiltration water production tank (6), the water outlet of the ultrafiltration water production tank (6) is connected with the water inlet of an ultrafiltration water pump (7), the water outlet of the ultrafiltration water pump (7) is connected with the water inlet of a reverse osmosis system (8), the water outlet of the reverse osmosis system (8) is connected with the water inlet of an intermediate water tank (9), the water outlet of the intermediate water tank (9) is connected with a mixed bed system, the other water outlet of the ultrafiltration water production tank (6) is connected with the water inlet of an ultrafiltration backwashing water pump (12), and the water outlet of the ultrafiltration backwashing water pump (12) is connected with the water outlets of the plurality of, the other water outlet of the reverse osmosis system (8) is connected with a water inlet of a reverse osmosis concentrated water tank (10) and a concentrated water discharge tank, the water outlet of the reverse osmosis concentrated water tank (10) is connected with the water inlet of a multi-media filter backwashing water pump (11), the water outlet of the multi-media filter backwashing water pump (11) is connected with the water outlets of a plurality of multi-media filters (4), and the other water outlets of the plurality of multi-media filters (4) and the ultrafiltration system (5) are connected to a backwashing water discharge tank;
the tank tops of the raw water tank (1), the ultrafiltration water producing tank (6) and the middle water tank (9) are respectively provided with a liquid level meter, a pipeline of a water outlet is provided with a pressure meter and a thermometer, water outlets of the plurality of multi-medium filters (4) are respectively provided with a turbidity sensor, and water outlets of the plurality of ultrafiltration systems (5) and the reverse osmosis system (8) are respectively provided with a concentration sensor;
the sequence control system comprises a sequence control selection unit (13), a logic control unit (14), a condition judgment unit (15), a queuing control unit (17), a fault feedback unit (18) and a sequence control system external interface (19), the output end of the sequential control selection unit (13) is connected with the input end of the logic control unit (14), the output end of the logic control unit (14) is connected with the input end of the condition judgment unit (15), the queuing control unit (17) is connected with the fault feedback unit (18), the output ends of the logic control unit (14) and the condition judgment unit (15) are both connected with the queuing control unit (17) and the fault feedback unit (18), the sequence control selection unit (13), the logic control unit (14), the condition judgment unit (15), the queuing control unit (17) and the fault feedback unit (18) are all connected with an external interface (19) of the sequence control system;
and the sequence control system external interface (19) is respectively and electrically connected with a pressure gauge and a thermometer in the raw water pool (1), the ultrafiltration production water pool (6) and the intermediate water pool (9), a turbidity sensor in the multi-medium filter (4), a concentration sensor in the ultrafiltration system (5) and the reverse osmosis system (8), the raw water lift pump (2), the heat exchanger (3) and the ultrafiltration water pump (7).
2. The system of claim 1, wherein the system comprises: the heat exchanger (3) is a plate heat exchanger.
3. The system of claim 1, wherein the system comprises: the sequential control system also comprises a counting unit (16), and the counting unit (16) is connected with a connecting line between the logic control unit (14) and the condition judgment unit (15).
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| CN202110499469.4A CN113087270A (en) | 2021-05-07 | 2021-05-07 | Inferior coal demineralized water pretreatment systems |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603281A (en) * | 2021-07-15 | 2021-11-05 | 华能荆门热电有限责任公司 | Operation method for fine control water treatment of power plant boiler feedwater system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113603281A (en) * | 2021-07-15 | 2021-11-05 | 华能荆门热电有限责任公司 | Operation method for fine control water treatment of power plant boiler feedwater system |
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