CN112066772A - Intelligent energy-saving raw water heating system - Google Patents
Intelligent energy-saving raw water heating system Download PDFInfo
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- CN112066772A CN112066772A CN202010946636.0A CN202010946636A CN112066772A CN 112066772 A CN112066772 A CN 112066772A CN 202010946636 A CN202010946636 A CN 202010946636A CN 112066772 A CN112066772 A CN 112066772A
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- water
- pipeline
- circulating
- raw water
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
Abstract
The invention discloses an intelligent energy-saving raw water heating system.A dividing wall type shell-and-tube flue gas-water heat exchanger is arranged on a flue and is connected with a circulating water system, and flue gas from a flue gas system in the dividing wall type shell-and-tube flue gas-water heat exchanger passes through a shell pass and a water pass through a tube pass; the circulating water system comprises a circulating pipeline, the circulating pipeline is connected with a raw water heating system, and the raw water heating system comprises a raw water heat exchanger; a water mixing pipeline is connected between a circulating water inlet pipeline and a circulating water outlet pipeline of the raw water heat exchanger, an adjusting valve is arranged on the water mixing pipeline to form a circulating flow dividing pipeline and a circulating flow converging pipeline, and the intelligent control system realizes the adjustment of the wall surface temperature of the raw water heat exchanger through the control of the adjusting valve. The circulating water is heated by the flue gas and cooled by the raw water, and the circulation is repeated; because the system utilizes the waste heat of the flue gas, the steam resource is saved, and the energy conservation is realized.
Description
Technical Field
The invention relates to a raw water heating system.
Background
The reverse osmosis membrane water production technology is an efficient separation technology, and the inlet water of the reverse osmosis membrane is generally called 'raw water'. In order to achieve the optimal effect of reverse osmosis membrane water production, the working conditions of the system must be met, wherein the viscosity of raw water is one of the important conditions. The raw water viscosity depends mainly on the water temperature.
Relation table of water temperature and water viscosity
| Water temperature, DEG C | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Viscosity 1000Pas | 1.79 | 1.73 | 1.67 | 1.62 | 1.57 | 1.52 | 1.47 | 1.43 | 1.38 | 1.34 |
| Water temperature, DEG |
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Viscosity 1000Pas | 1.31 | 1.27 | 1.23 | 1.20 | 1.17 | 1.14 | 1.11 | 1.08 | 1.05 | 1.03 |
| Water temperature, DEG C | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| Viscosity 1000Pas | 1.00 | 0.98 | 0.95 | 0.93 | 0.91 | 0.89 | 0.87 | 0.85 | 0.83 | 0.81 |
| Water temperature, DEG C | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 |
| Viscosity 1000Pas | 0.80 | 0.78 | 0.76 | 0.75 | 0.73 | 0.72 | 0.71 | 0.69 | 0.68 | 0.67 |
| Water temperature, DEG C | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 |
| Viscosity 1000Pas | 0.65 | 0.64 | 0.63 | 0.62 | 0.61 | 0.60 | 0.59 | 0.58 | 0.57 | 0.56 |
As can be seen from the water temperature and viscosity, the viscosity is very much dependent on temperature. The viscosity of water at 25 ℃ is only half that of water at 4 ℃. The higher the temperature of the water is, the lower the viscosity of the water is, and the larger the water yield of the system is, generally speaking, the water yield is increased by 2-4% when the water inlet temperature is increased by 1 ℃, and the water yield is reduced by 2-4% when the water inlet temperature is reduced by 1 ℃.
The temperature of the raw water is usually controlled between 20-25 ℃. Typically not exceeding 35 deg.c. Too high temperature (above 40 ℃) can damage the membrane module, and the transmittance is too high, so that the quality of the effluent water does not reach the standard. Therefore, the accurate control of the inlet water temperature of the reverse osmosis membrane is particularly important.
At present, a raw water heating system mostly adopts a steam heating mode. The disadvantages of steam heating are:
(1) is not economical and energy-saving; the steam has high quality, and under the condition of the same energy, the price of the steam is more than 2 times that of the hot water. In most cases, the hot water can use waste heat, which corresponds to near zero cost.
(2) Inaccurate temperature control; the steam heat capacity is small, and the heat capacity of raw water is large, so that the fluctuation is large during the adjustment and control of the system, the temperature change of the raw water is large, and the system operation is unreliable.
(3) Scaling and unreliable operation; the steam temperature is too high, the raw water usually contains calcium bicarbonate, the calcium bicarbonate is decomposed into calcium carbonate and carbon dioxide at a certain temperature, and the calcium carbonate deposition causes scaling.
Disclosure of Invention
The invention aims to provide an intelligent energy-saving raw water heating system with good energy-saving and anti-scaling effects.
The technical solution of the invention is as follows:
an energy-saving raw water heating system of wisdom, characterized by: the system comprises a dividing wall type shell-and-tube flue gas-water heat exchanger, wherein the dividing wall type shell-and-tube flue gas-water heat exchanger is arranged on a flue with the exhaust gas temperature higher than 40 ℃ and lower than 200 ℃, the dividing wall type shell-and-tube flue gas-water heat exchanger is connected with a circulating water system, and the flue gas from the flue gas system in the dividing wall type shell-and-tube flue gas-water heat exchanger passes through a shell pass and a water pass through a tube pass; the circulating water system comprises a circulating pipeline, the circulating pipeline is connected with a raw water heating system, the raw water heating system comprises a raw water heat exchanger, and circulating water from the dividing wall type shell-and-tube flue gas-water heat exchanger is cooled by raw water in the raw water heat exchanger; a water mixing pipeline is connected between a circulating water inlet pipeline and a circulating water outlet pipeline of the raw water heat exchanger, an adjusting valve is arranged on the water mixing pipeline to form a circulating flow dividing pipeline and a circulating flow converging pipeline, and the intelligent control system realizes the adjustment of the wall surface temperature of the raw water heat exchanger through the control of the adjusting valve.
And a flue gas supercharging device is arranged on the flue gas system. And the flue gas system is provided with a flue gas demisting device.
A circulating pump is arranged on the circulating water system; a water supplementing and pressure fixing system is arranged on the circulating water system; and a bypass purification system is arranged on the circulating water system.
And a circulating water inlet pipeline of the raw water heat exchanger is provided with a suction pump. The extraction pump is in a variable frequency control mode.
And a connecting pipeline for connecting the water outlet end pipeline and the water inlet end pipeline is arranged on the circulating pipeline of the circulating water system, and a check valve is arranged on the connecting pipeline to form a hot water diversion pipeline and a cold water confluence pipeline.
The circulating water is heated by the flue gas and cooled by the raw water, and the circulation is repeated; because the system utilizes the waste heat of the flue gas, the steam resource is saved, and the energy conservation is realized.
The raw water contains a large amount of calcium and magnesium ions, the wall surface temperature of the raw water heat exchanger exceeds the scaling temperature, scaling can be formed on the surface of the heat exchanger, the wall surface temperature changes and migrates after scaling, and the scaling gradually grows until blocking.
The intelligent control system simulates annual water quality data and is provided with auxiliary instruments such as conductivity, PH value and the like to carry out comprehensive scaling analysis and judgment, so that an instruction is sent to adjust the wall surface temperature of the raw water heat exchanger, and intelligent scale prevention and intelligent energy conservation are realized.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
An intelligent energy-saving raw water heating system comprises a dividing wall type shell-and-tube flue gas-water heat exchanger 1, wherein the dividing wall type shell-and-tube flue gas-water heat exchanger is arranged on a flue with the exhaust gas temperature higher than 40 ℃ and lower than 200 ℃, the dividing wall type shell-and-tube flue gas-water heat exchanger is connected with a circulating water system, and the flue gas from a flue gas system in the dividing wall type shell-and-tube flue gas-water heat exchanger travels through a shell pass and a water tube pass; the circulating water system comprises a circulating pipeline 2, the circulating pipeline is connected with a raw water heating system, the raw water heating system comprises a raw water heat exchanger 3, circulating water from the dividing wall type shell-and-tube flue gas-water heat exchanger is cooled by raw water (from a chemical water workshop) in the raw water heat exchanger, and the raw water is sent back to the chemical water workshop; connect water mixing pipeline 4 between raw water heat exchanger's circulating water inlet pipeline, the circulating water outlet pipeline, be equipped with governing valve 5 on the water mixing pipeline, form circulation reposition of redundant personnel pipeline, circulation confluence pipeline, intelligent control system 6 realizes the regulation to raw water heat exchanger wall temperature through the control to the governing valve.
If the flue gas system needs, a flue gas supercharging device can be additionally arranged; if fog drops are separated out in the cooling process of the flue gas, a flue gas demisting device can be additionally arranged;
a circulating pump is arranged on the circulating water system; a water supplementing constant pressure system (water pressure stabilization is realized through water supplementing) 7 is arranged on the circulating water system; and a bypass purification system 8 is arranged on the circulating water system to purify water.
And a circulating water inlet pipeline of the raw water heat exchanger is provided with an extraction pump 9. The extraction pump is preferably of variable frequency control.
A connecting pipeline 10 for connecting a water outlet end pipeline and a water inlet end pipeline is arranged on a circulating pipeline of the circulating water system, and a check valve 11 is arranged on the connecting pipeline to form a hot water diversion pipeline and a cold water confluence pipeline.
The figures also show normally open valves 12, 13, normally open valves (butterfly valves) 14, 15, 16, 17, and normally closed valves (butterfly valves) 18.
Claims (7)
1. An energy-saving raw water heating system of wisdom, characterized by: the system comprises a dividing wall type shell-and-tube flue gas-water heat exchanger, wherein the dividing wall type shell-and-tube flue gas-water heat exchanger is arranged on a flue with the exhaust gas temperature higher than 40 ℃ and lower than 200 ℃, the dividing wall type shell-and-tube flue gas-water heat exchanger is connected with a circulating water system, and the flue gas from the flue gas system in the dividing wall type shell-and-tube flue gas-water heat exchanger passes through a shell pass and a water pass through a tube pass; the circulating water system comprises a circulating pipeline, the circulating pipeline is connected with a raw water heating system, the raw water heating system comprises a raw water heat exchanger, and circulating water from the dividing wall type shell-and-tube flue gas-water heat exchanger is cooled by raw water in the raw water heat exchanger; a water mixing pipeline is connected between a circulating water inlet pipeline and a circulating water outlet pipeline of the raw water heat exchanger, an adjusting valve is arranged on the water mixing pipeline to form a circulating flow dividing pipeline and a circulating flow converging pipeline, and the intelligent control system realizes the adjustment of the wall surface temperature of the raw water heat exchanger through the control of the adjusting valve.
2. The intelligent energy-saving raw water heating system according to claim 1, wherein: and a flue gas supercharging device is arranged on the flue gas system.
3. The intelligent energy-saving raw water heating system according to claim 1, wherein: and the flue gas system is provided with a flue gas demisting device.
4. The intelligent energy-saving raw water heating system according to claim 1, 2 or 3, characterized in that: a circulating pump is arranged on the circulating water system; a water supplementing and pressure fixing system is arranged on the circulating water system; and a bypass purification system is arranged on the circulating water system.
5. The intelligent energy-saving raw water heating system according to claim 1, 2 or 3, characterized in that: and a circulating water inlet pipeline of the raw water heat exchanger is provided with a suction pump.
6. The intelligent energy-saving raw water heating system according to claim 5, wherein: the extraction pump is in a variable frequency control mode.
7. The intelligent energy-saving raw water heating system according to claim 1, 2 or 3, characterized in that: and a connecting pipeline for connecting the water outlet end pipeline and the water inlet end pipeline is arranged on the circulating pipeline of the circulating water system, and a check valve is arranged on the connecting pipeline to form a hot water diversion pipeline and a cold water confluence pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946636.0A CN112066772A (en) | 2020-09-10 | 2020-09-10 | Intelligent energy-saving raw water heating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946636.0A CN112066772A (en) | 2020-09-10 | 2020-09-10 | Intelligent energy-saving raw water heating system |
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| CN112066772A true CN112066772A (en) | 2020-12-11 |
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| CN202010946636.0A Pending CN112066772A (en) | 2020-09-10 | 2020-09-10 | Intelligent energy-saving raw water heating system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2556823A1 (en) * | 1974-12-30 | 1976-07-01 | Oesterr Salen Kunststoffwerk | CONTROL DEVICE FOR SURFACE HEATING FUELED WITH HOT WATER |
| CN102819276A (en) * | 2011-11-30 | 2012-12-12 | 凯迈(洛阳)机电有限公司 | Constant temperature device of engine oil |
| CN203657141U (en) * | 2013-07-04 | 2014-06-18 | 北京帅安节能设备有限公司 | Ambient temperature compensation controller |
| CN104898433A (en) * | 2015-06-25 | 2015-09-09 | 马鞍山市安工大工业技术研究院有限公司 | Furnace cooling intensity control method based on vague PID control |
| CN205640868U (en) * | 2016-05-25 | 2016-10-12 | 无锡蓝天燃机热电有限公司 | Give birth to water heating system |
| CN109268929A (en) * | 2018-09-26 | 2019-01-25 | 西安煜鼎中实环境能源有限公司 | A kind of energy saving in heating system regulating system and method |
-
2020
- 2020-09-10 CN CN202010946636.0A patent/CN112066772A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2556823A1 (en) * | 1974-12-30 | 1976-07-01 | Oesterr Salen Kunststoffwerk | CONTROL DEVICE FOR SURFACE HEATING FUELED WITH HOT WATER |
| CN102819276A (en) * | 2011-11-30 | 2012-12-12 | 凯迈(洛阳)机电有限公司 | Constant temperature device of engine oil |
| CN203657141U (en) * | 2013-07-04 | 2014-06-18 | 北京帅安节能设备有限公司 | Ambient temperature compensation controller |
| CN104898433A (en) * | 2015-06-25 | 2015-09-09 | 马鞍山市安工大工业技术研究院有限公司 | Furnace cooling intensity control method based on vague PID control |
| CN205640868U (en) * | 2016-05-25 | 2016-10-12 | 无锡蓝天燃机热电有限公司 | Give birth to water heating system |
| CN109268929A (en) * | 2018-09-26 | 2019-01-25 | 西安煜鼎中实环境能源有限公司 | A kind of energy saving in heating system regulating system and method |
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Application publication date: 20201211 |
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