CN113606646B - Automatic control system and method for drainage recovery of heat supply network - Google Patents
Automatic control system and method for drainage recovery of heat supply network Download PDFInfo
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- CN113606646B CN113606646B CN202110766265.2A CN202110766265A CN113606646B CN 113606646 B CN113606646 B CN 113606646B CN 202110766265 A CN202110766265 A CN 202110766265A CN 113606646 B CN113606646 B CN 113606646B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/08—Arrangements for drainage, venting or aerating
- F24D19/082—Arrangements for drainage, venting or aerating for water heating systems
- F24D19/088—Draining arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
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Abstract
The invention discloses a system and a method for automatically controlling drainage recovery of a heat supply network, which comprises an online hydrogen conductivity meter, an online sodium meter and an online silicon meter which are arranged on a drainage main pipe of a heat supply network heater, an online hydrogen conductivity meter A and an electric three-way valve A which are arranged on an outlet pipeline of the heat supply network heater A, an online hydrogen conductivity meter B and an electric three-way valve B which are arranged on an outlet pipeline of the heat supply network heater B, an online hydrogen conductivity meter C and an electric three-way valve C which are arranged on an outlet pipeline of the heat supply network heater C, an online hydrogen conductivity meter D and an electric three-way valve D which are arranged on an outlet pipeline of the heat supply network heater D, an electric valve arranged on a drainage and pollution discharge main pipe of the heat supply network heater, and a PLC (programmable logic controller); when the measured value of any one of the on-line hydrogen conductivity meter, the on-line sodium meter and the on-line silicon meter on the drainage main pipe of the heat supply network heater exceeds the control standard, the PLC works to ensure that the water quality index of the drainage main pipe of the heat supply network heater is controlled within a qualified range, and the automatic control of drainage recovery of the heat supply network is realized.
Description
Technical Field
The invention relates to a drainage system of a heat supply network heater in a power plant, in particular to an automatic control system and method for drainage recovery of a heat supply network.
Background
With the development of northern cities in China, the heat supply demand in winter is gradually increased. When the steam extraction flow of the heat supply unit is increased, the corresponding water drainage amount is gradually increased. For part of direct current furnace heat supply units, drainage of the heat supply network heater can directly enter the deaerator so as to recover corresponding heat. Due to seasonal investment of a heating network heater, a non-random unit continuously operates, and the drainage water quality is poor at the initial investment stage; in addition, the heat supply network heater can also leak in the operation process, and in a word, the quality of the drainage water quality of the heat supply network heater can greatly influence the water quality of the feed water of the direct current furnace set. Because the once-through boiler has no steam drum, the water quality of the feed water is polluted, impurities in the feed water cannot be discharged, and the impurities directly enter a steam system, so that the phenomena of corrosion and scaling of an evaporation section of the boiler, salt accumulation in the steam engine and the like occur, and the safe operation of a unit is damaged. Therefore, reasonable recycling of the drainage water quality of the heat supply network heater is considered in the key aspect of ensuring the qualified water quality of the supplied water. When the quality of the drained water of the heat supply network heater is unqualified, the automatic control of the drained water recovery of the heat supply network is particularly important.
The mass of the hydrophobic water in the heat supply network recovered by the direct current furnace unit to the deaerator is shown in table 1 according to the mass of the water vapor of the thermal power generating unit and the steam power equipment (GB/T12145-2016).
TABLE 1 GB/T12145-2016 Heat network hydrophobic quality recovered to a deaerator.
| Superheated steam pressure MPa | Hydrogen conductivity (25 ℃ C.). Mu.S/cm | mu.g/L of sodium | Mu g/L of silicon |
| 5.9-18.3 | ≤0.20 | ≤5 | ≤15 |
| ≥18.3 | ≤0.20 | ≤2 | ≤10 |
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an automatic control system and method for drainage recovery of a heat supply network, which can effectively solve the problems that the drainage water quality is poor in the initial stage of putting a heat supply network heater into operation and the drainage recovery water quality is influenced by leakage in operation, thereby avoiding the phenomena of corrosion and scaling of an evaporation section of a boiler, salt accumulation in a steam turbine and the like caused by unqualified drainage of heat supply water.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a hydrophobic automatic control system that retrieves of heat supply network, characterized by includes: the system comprises an online hydrogen conductivity meter, an online sodium meter and an online silicon meter which are arranged on a drainage main pipe of a heat supply network heater, an online hydrogen conductivity meter A and an electric three-way valve A which are arranged on an outlet pipeline of the heat supply network heater A, an online hydrogen conductivity meter B and an electric three-way valve B which are arranged on an outlet pipeline of the heat supply network heater B, an online hydrogen conductivity meter C and an electric three-way valve C which are arranged on an outlet pipeline of the heat supply network heater C, an online hydrogen conductivity meter D and an electric three-way valve D which are arranged on an outlet pipeline of the heat supply network heater D, an electric valve arranged on a drainage main pipe of the heat supply network heater and a PLC controller; the PLC is connected with an online hydrogen conductivity meter, an online sodium meter, an online silicon meter, an online hydrogen conductivity meter A, an online hydrogen conductivity meter B, an online hydrogen conductivity meter C and an online hydrogen conductivity meter D, and receives measurement signals of the meters; the PLC is connected with the electric three-way valve A, the electric three-way valve B, the electric three-way valve C, the electric three-way valve D and the electric valve, controls the straight-through and sewage discharge channel conversion of the electric three-way valve A, the electric three-way valve B, the electric three-way valve C and the electric three-way valve D, and controls the turn-off and the turn-on of the electric valve.
The automatic control method of the automatic control system for the drainage recovery of the heat supply network comprises the following steps:
when the heat supply network heater A, the heat supply network heater B, the heat supply network heater C and the heat supply network heater D operate, the PLC controller judges the straight-through and pollution discharge conversion of the electric three-way valve A, the electric three-way valve B, the electric three-way valve C and the electric three-way valve D according to the measured values of the online hydrogen conductivity meter, the online sodium meter, the online silicon meter, the online hydrogen conductivity meter A, the online hydrogen conductivity meter B, the online hydrogen conductivity meter C and the online hydrogen conductivity meter D, and controls the cut-off and the opening of the electric valve; when the measured value of any one of the online hydrogen conductivity meter, the online sodium meter and the online silicon meter exceeds the control standard, the PLC controller feeds back the hydrogen conductivity meter with the maximum measured value on the online hydrogen conductivity meter A, the online hydrogen conductivity meter B, the online hydrogen conductivity meter C and the online hydrogen conductivity meter D, adjusts the corresponding electric three-way valve arranged on the outlet pipeline of the heat supply network heater from direct connection to a sewage discharge state, and simultaneously opens the electric valve from a cut-off state to an open state to ensure that the water quality index control of the drain main pipe of the heat supply network heater is kept in a qualified range, thereby realizing the automatic qualified control of the drain recovered water quality of the heat supply network.
Further, the control standards of the online hydrogen conductivity meter, the online sodium meter and the online silicon meter are as follows: when the overheating steam pressure of the direct current boiler is 5.9 to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 mu S/cm, the sodium content is less than or equal to 5 mu g/L, and the silicon content is less than or equal to 15 mu g/L; when the superheated steam pressure of the once-through boiler is more than or equal to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 MuS/cm, the sodium content is less than or equal to 2 Mug/L, and the silicon content is less than or equal to 10 Mug/L.
Compared with the prior art, the invention has the following advantages and effects: the invention has the advantages of considering both the on-line monitoring of the drainage water quality of the heat supply network heater and the safe recovery when the drainage water quality of the heat supply network heater is unqualified. The real-time online monitoring of the drainage water quality of the heat supply network is ensured, meanwhile, under the condition that the water quality of the drainage main pipe is unqualified, manual testing indexes and field on-site operation are not needed, the time for unqualified drainage recovery analysis testing and operation switching to sewage discharge is shortened, the influence of unqualified drainage water on the water quality of the water supply is reduced, and the phenomena of corrosion and scaling of an evaporation section of a boiler, salt accumulation in the steam turbine and the like caused by the unqualified drainage water of the heat supply network on the water quality of the water supply are effectively avoided.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
FIG. 1: the system comprises an online silicon meter 1, an online sodium meter 2, an online hydrogen conductivity meter 3, an online hydrogen conductivity meter A4, an online hydrogen conductivity meter B5, an online hydrogen conductivity meter C6, an online hydrogen conductivity meter D7, an electric three-way valve A8, an electric three-way valve B9, an electric three-way valve C10, an electric three-way valve D11, an electric valve 12, a PLC (programmable logic controller) 13, a heat supply network heater drainage main pipe 14, a heat supply network heater drainage sewage discharge main pipe 15, a heat supply network heater A16, a heat supply network heater B17, a heat supply network heater C18 and a heat supply network heater D19.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples
Referring to fig. 1, in this embodiment, an automatic control system for recovering drain from a heat supply network includes: the system comprises an online hydrogen conductivity meter 3, an online sodium meter 2 and an online silicon meter 1 which are arranged on a drainage mother pipe 14 of a heat supply network heater, an online hydrogen conductivity meter A4 and an electric three-way valve A8 which are arranged on an outlet pipeline of a heat supply network heater A16, an online hydrogen conductivity meter B5 and an electric three-way valve B9 which are arranged on an outlet pipeline of a heat supply network heater B17, an online hydrogen conductivity meter C6 and an electric three-way valve C10 which are arranged on an outlet pipeline of a heat supply network heater C18, an online hydrogen conductivity meter D7 and an electric three-way valve D11 which are arranged on an outlet pipeline of a heat supply network heater D19, an electric valve 12 which is arranged on a drainage and pollution discharge mother pipe 15 of the heat supply network heater and a PLC (programmable logic controller) 13; the PLC 13 is connected with an online hydrogen conductivity meter 3, an online sodium meter 2, an online silicon meter 1, an online hydrogen conductivity meter A4, an online hydrogen conductivity meter B5, an online hydrogen conductivity meter C6 and an online hydrogen conductivity meter D7, and receives measurement signals of the meters; the PLC controller 13 connects the electric three-way valve A8, the electric three-way valve B9, the electric three-way valve C10, the electric three-way valve D11, and the electric valve 12, and controls the straight-through and drain passage switching of the electric three-way valve A8, the electric three-way valve B9, the electric three-way valve C10, and the electric three-way valve D11, and controls the turning-off and turning-on of the electric valve 12.
The automatic control method of the automatic control system for the drainage recovery of the heat supply network comprises the following steps:
when the heat supply network heater A16, the heat supply network heater B17, the heat supply network heater C18 and the heat supply network heater D19 operate, the PLC 13 judges the direct connection and pollution discharge conversion of the electric three-way valve A8, the electric three-way valve B9, the electric three-way valve C10 and the electric three-way valve D11 according to the measured values of the online hydrogen conductivity meter 3, the online sodium meter 2, the online silicon meter 1, the online hydrogen conductivity meter A4, the online hydrogen conductivity meter B5, the online hydrogen conductivity meter C6 and the online hydrogen conductivity meter D7, and controls the turn-off and turn-on of the electric valve 12; when the measured value of any one of the online hydrogen conductivity meter 3, the online sodium meter 2 and the online silicon meter 1 exceeds the control standard, the PLC 13 feeds back the hydrogen conductivity meter with the largest measured value on the online hydrogen conductivity meter A4, the online hydrogen conductivity meter B5, the online hydrogen conductivity meter C6 and the online hydrogen conductivity meter D7, adjusts the corresponding electric three-way valve arranged on the outlet pipeline of the heat supply network heater from a direct connection state to a pollution discharge state, and simultaneously opens the electric valve 12 from a turn-off state to a turn-on state, so that the water quality index control of the drain main pipe 14 of the heat supply network heater is ensured to be kept in a qualified range, and the automatic control of the water quality of the drain recovery of the heat supply network is realized.
Specifically, the control standards of the online hydrogen conductivity meter 3, the online sodium meter 2 and the online silicon meter 1 are as follows: when the overheating steam pressure of the direct current boiler is 5.9 to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 mu S/cm, the sodium content is less than or equal to 5 mu g/L, and the silicon content is less than or equal to 15 mu g/L; when the superheated steam pressure of the once-through boiler is more than or equal to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 MuS/cm, the sodium content is less than or equal to 2 Mug/L, and the silicon content is less than or equal to 10 Mug/L.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (2)
1. An automatic control method of an automatic control system for drainage recovery of a heat supply network is characterized in that the automatic control system comprises: the system comprises an online hydrogen conductivity meter (3), an online sodium meter (2) and an online silicon meter (1) which are arranged on a drainage main pipe (14) of a heat supply network heater, an online hydrogen conductivity meter A (4) and an electric three-way valve A (8) which are arranged on an outlet pipeline of the heat supply network heater A (16), an online hydrogen conductivity meter B (5) and an electric three-way valve B (9) which are arranged on an outlet pipeline of a heat supply network heater B (17), an online hydrogen conductivity meter C (6) and an electric three-way valve C (10) which are arranged on an outlet pipeline of a heat supply network heater C (18), an online hydrogen conductivity meter D (7) and an electric three-way valve D (11) which are arranged on an outlet pipeline of a heat supply network heater D (19), an electric valve (12) which is arranged on a drainage main pipe (15) of the heat supply network heater, and a PLC (13); the PLC (13) is connected with the online hydrogen conductivity meter (3), the online sodium meter (2), the online silicon meter (1), the online hydrogen conductivity meter A (4), the online hydrogen conductivity meter B (5), the online hydrogen conductivity meter C (6) and the online hydrogen conductivity meter D (7) and receives measurement signals of the meters; the PLC (13) is connected with the electric three-way valve A (8), the electric three-way valve B (9), the electric three-way valve C (10), the electric three-way valve D (11) and the electric valve (12), controls the straight-through and sewage discharge channel conversion of the electric three-way valve A (8), the electric three-way valve B (9), the electric three-way valve C (10) and the electric three-way valve D (11), and controls the turn-off and turn-on of the electric valve (12);
the automatic control method comprises the following processes: when the heat network heater A (16), the heat network heater B (17), the heat network heater C (18) and the heat network heater D (19) are operated, the PLC controller (13) judges the through and sewage discharge conversion of the electric three-way valve A (8), the electric three-way valve B (9), the electric three-way valve C (10) and the electric three-way valve D (11) according to the measured values of the online hydrogen conductivity meter (3), the online sodium meter (2), the online silicon meter (1), the online hydrogen conductivity meter A (4), the online hydrogen conductivity meter B (5), the online hydrogen conductivity meter C (6) and the online hydrogen conductivity meter D (7), and controls the closing and the opening of the electric valve (12); when the measured value of any one of the online hydrogen conductivity meter (3), the online sodium meter (2) and the online silicon meter (1) exceeds the control standard, the PLC (13) feeds back the hydrogen conductivity meter with the largest measured value on the online hydrogen conductivity meter A (4), the online hydrogen conductivity meter B (5), the online hydrogen conductivity meter C (6) and the online hydrogen conductivity meter D (7), adjusts the corresponding electric three-way valve arranged on the outlet pipeline of the heat network heater from direct connection to a pollution discharge state, and simultaneously opens the electric valve (12) from cut-off to open state, so as to ensure that the water quality index control of the drain main pipe (14) of the heat network heater is kept in a qualified range, and realize the automatic qualified control of the drain recovered water quality of the heat network.
2. The automatic control method of the automatic control system for the drainage recovery of the heat supply network according to claim 1, wherein the control standards of the on-line hydrogen conductivity meter (3), the on-line sodium meter (2) and the on-line silicon meter (1) are as follows: when the superheated steam pressure of the once-through boiler is 5.9 to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 mu S/cm, the sodium content is less than or equal to 5 mu g/L, and the silicon content is less than or equal to 15 mu g/L; when the superheated steam pressure of the once-through boiler is more than or equal to 18.3MPa, the hydrogen conductivity is less than or equal to 0.2 mu S/cm, the sodium content is less than or equal to 2 mu g/L, and the silicon content is less than or equal to 10 mu g/L.
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| CN114941863A (en) * | 2022-05-12 | 2022-08-26 | 华能(大连)热电有限责任公司 | Heat supply network drainage grading recovery device and recovery method thereof |
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| CN209102289U (en) * | 2018-12-27 | 2019-07-12 | 西安热工研究院有限公司 | A kind of hydrophobic online leakage detection apparatus of heat exchangers for district heating |
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| JP2924671B2 (en) * | 1994-11-11 | 1999-07-26 | 三菱電機株式会社 | Water treatment system for fuel cell power plant |
| JP5132205B2 (en) * | 2007-06-27 | 2013-01-30 | 京セラ株式会社 | Fuel cell device |
| JP5182553B2 (en) * | 2007-12-10 | 2013-04-17 | 栗田工業株式会社 | Boiler water quality management device and boiler water quality management method |
| JP6512021B2 (en) * | 2015-08-03 | 2019-05-15 | 三浦工業株式会社 | Water heating system |
| CN105737231A (en) * | 2016-04-29 | 2016-07-06 | 华电郑州机械设计研究院有限公司 | Novel heat supply network water replenishing system |
| CN105805809A (en) * | 2016-04-29 | 2016-07-27 | 华电郑州机械设计研究院有限公司 | Novel heating network heater parallel-connection heat supply system |
| CN207729568U (en) * | 2017-11-29 | 2018-08-14 | 忻州广宇煤电有限公司 | A kind of hot flushing water reclamation system of heat supply network |
| CN109443648A (en) * | 2018-12-27 | 2019-03-08 | 西安热工研究院有限公司 | A kind of hydrophobic method and apparatus hunted leak online of heat exchangers for district heating |
| CN110593971A (en) * | 2019-09-05 | 2019-12-20 | 国网河北能源技术服务有限公司 | Thermoelectric hydrogen poly-generation system for improving flexibility of thermoelectric unit |
| CN111795378A (en) * | 2020-06-18 | 2020-10-20 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Heat supply network hydrophobic recycling system and method suitable for thermal power plant |
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| CN107620948A (en) * | 2017-11-01 | 2018-01-23 | 华电郑州机械设计研究院有限公司 | A kind of Gateway Station in Heating Network safety monitoring system |
| CN209102289U (en) * | 2018-12-27 | 2019-07-12 | 西安热工研究院有限公司 | A kind of hydrophobic online leakage detection apparatus of heat exchangers for district heating |
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