CN113606646A - 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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- CN113606646A CN113606646A CN202110766265.2A CN202110766265A CN113606646A CN 113606646 A CN113606646 A CN 113606646A CN 202110766265 A CN202110766265 A CN 202110766265A CN 113606646 A CN113606646 A CN 113606646A
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- heat supply
- hydrogen conductivity
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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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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses an automatic control system and method for 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 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 pocket, the water quality of the feed water is polluted, impurities in the feed water cannot be discharged, the impurities directly enter a steam system, and therefore phenomena such as corrosion and scaling of an evaporation section of the boiler, salt accumulation in the steam turbine 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 drainage water quality of the heat supply network heater is unqualified, the automatic control of the drainage recovery of the heat supply network is particularly important.
The mass of the hydrophobic water of 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-.
TABLE 1 GB/T12145-2016 Heat grid 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 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 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 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 and controls the turn-off and turn-on of the electric valve according to the measured values of the on-line hydrogen conductivity meter, the on-line sodium meter, the on-line silicon meter, the on-line hydrogen conductivity meter A, the on-line hydrogen conductivity meter B, the on-line hydrogen conductivity meter C and the on-line hydrogen conductivity meter D; 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 feeds back the hydrogen conductivity meter with the largest 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 a direct connection state to a pollution discharge state, and simultaneously opens the electric valve from a turn-off state to a turn-on 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 control of the water quality qualification of the drain recovery of the heat supply network heater.
Further, the control standards of the online hydrogen conductivity meter, the online sodium meter and the online silicon meter are as follows: when the superheated steam pressure of the once-through boiler is 5.9-18.3 MPa, 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 architecture 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 hot net heater drainage main pipe 14, a hot net heater drainage sewage main pipe 15, a hot net heater A16, a hot net heater B17, a hot net heater C18 and a hot net 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 to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, an automatic control system for recovering drain from a heat supply network includes: 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 the 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 B17 of the heat supply network heater, an online hydrogen conductivity meter C6 and an electric three-way valve C10 which are arranged on an outlet pipeline of a C18 of the heat supply network heater, an online hydrogen conductivity meter D7 and an electric three-way valve D11 which are arranged on an outlet pipeline of a D19 of the heat supply network heater, 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 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 are operated, the PLC controller 13 judges the through and drain 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 on of the electric valve 12 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; 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 maximum 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 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 network heater is ensured to be kept in a qualified range, and the automatic control of the drain recovered water quality of the heat 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 superheated steam pressure of the once-through boiler is 5.9-18.3 MPa, 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 (3)
1. 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 (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 an online hydrogen conductivity meter (3), an online sodium meter (2), an online silicon meter (1), an online hydrogen conductivity meter A (4), an online hydrogen conductivity meter B (5), an online hydrogen conductivity meter C (6) and an 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 direct connection and the 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 the turn-on of the electric valve (12).
2. The automatic control method of the automatic control system for the drainage recovery of the heat supply network according to claim 1, which is characterized by comprising the following steps: when a heat supply network heater A (16), a heat supply network heater B (17), a heat supply network heater C (18) and a heat supply network heater D (19) operate, the PLC (13) judges the through and pollution 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 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 maximum 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.
3. The automatic control method of the automatic control system for the drainage recovery of the heat supply network according to claim 2, 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 5.9-18.3 MPa, 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.
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| CN202110766265.2A CN113606646B (en) | 2021-07-07 | 2021-07-07 | Automatic control system and method for drainage recovery of heat supply network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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