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Suppression method for back pressure interference of steam-driven feed water pump in direct air-cooled unit

A steam-driven feedwater pump and air-cooling unit technology, which is applied in the direction of pump control, water supply control, machine/engine, etc., can solve the problems of small machine power influence, endangering boiler safety, etc., and achieve the weakening of small machine speed fluctuations and boiler feedwater flow fluctuations weakened effect

Active Publication Date: 2017-11-07
NANJING POWER HORIZON INFORMATION TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention aims to solve the problem that the back pressure disturbance of the air-cooled unit with direct discharge of small machines and large machines affects the power of small machines within the range of all working conditions, thereby endangering the safety of the boiler. Backpressure Interference Suppression Method for Steam-driven Feedwater Pump of Air-Cooling Units with Small Machines Direct Displacement and Large Machines

Method used

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  • Suppression method for back pressure interference of steam-driven feed water pump in direct air-cooled unit
  • Suppression method for back pressure interference of steam-driven feed water pump in direct air-cooled unit
  • Suppression method for back pressure interference of steam-driven feed water pump in direct air-cooled unit

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specific Embodiment approach 1

[0031] Specific implementation mode one: refer to figure 1 Specifically explain this embodiment, the method for suppressing the back pressure interference of the direct air-cooled unit with direct discharge of small units and steam-operated feedwater pumps in this embodiment, the method includes the following steps:

[0032] Step 1: Obtain the backpressure feed-forward coefficient f(P) by using the current backpressure value P;

[0033] Step 2: Obtain the working condition correction coefficient f(G) by using the set value of the feedwater flow;

[0034] Step 3: Obtain the back pressure feed-forward amount △Z according to the back pressure feed-forward coefficient f(P) and working condition correction coefficient f(G),

[0035] ΔZ=P×f(P)×f(G);

[0036] Step 4: Limit the back pressure feed-forward amount △Z, and then increase the limited back pressure feed-forward amount △Z to the set value of the valve position of the small machine to complete the suppression of the back pre...

specific Embodiment approach 2

[0037] Specific embodiment 2: This embodiment is to further explain the back pressure interference suppression method of the direct air-cooled unit small machine direct row steam-driven feed water pump described in specific embodiment 1. In this embodiment, the back pressure feed-forward coefficient f( P) is obtained by interpolating the current back pressure value through the F1(x) function, specifically:

[0038] The specific method of obtaining the backpressure feed-forward coefficient f(P) by using the current backpressure value P is as follows:

[0039]

[0040] Among them, dh is the actual enthalpy drop of the small machine, and its unit is J / kg. Under the design condition, the actual enthalpy drop dh is a single-valued function of the back pressure, which can be obtained by the isentropic enthalpy drop method; G is the flow rate of the small machine working fluid , the unit is kg / s, and the flow rate of the small mechanical medium is a constant value under the design...

specific Embodiment approach 3

[0042] Specific embodiment three: This embodiment is a further description of the method for suppressing the back pressure interference of the direct air-cooled unit small machine direct row steam-driven feed water pump described in specific embodiment one or two. In this embodiment, f(G) is given by The set value of feed water flow is interpolated by the F2(x) function, specifically:

[0043] The specific method of obtaining the working condition correction coefficient f(G) by using the set value of the feedwater flow is as follows:

[0044]

[0045] Among them, G i is the steam inlet flow of the small machine under the current working condition, and is a single-valued function of the set value of the feedwater flow; dh i is the actual enthalpy drop of the small machine under the current working condition and the design back pressure, which is a single-valued function of the set value of the feed water flow; dh c is the actual enthalpy drop of the small machine under des...

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Abstract

The invention discloses a steam feed pump back pressure interference suppression method for small machine direct exhausting of a direct air cooling unit, relates to the technical field of boiler water feeding, steam feed pumps and direct-cooled air-cooled islands, and aims to solve the problem of boiler safety caused by influence on the small machine power by the back pressure interference of a small machine direct exhausting and large machine air cooling unit in the all-working condition range. The steam feed pump back pressure interference suppression method for small machine direct exhausting of the direct air cooling unit uses a present back pressure value for obtaining a back pressure feedforward coefficient; a working condition correction coefficient is obtained by using a water feeding flow set value; a back pressure feedforward quantity is obtained according to the back pressure feedforward coefficient and the working condition correction coefficient; the amplitude limit is performed for the back pressure feedforward quantity; and then, the amplitude-limited back pressure feedforward quantity is added on a small machine valve position set value to finish the steam feed pump back pressure interference suppression. The steam feed pump back pressure interference suppression method is suitable for eliminating the potential safety hazards of boilers caused by small machine power fluctuation due to back pressure fluctuation under all working conditions of the small machine direct exhausting and large machine air cooling unit.

Description

technical field [0001] The invention belongs to the technical field of steam-driven feedwater pumps, boiler feedwater, and direct-cooling air-cooled island water supply, and in particular relates to a method for suppressing back pressure interference of steam-driven feedwater pumps with direct air-cooling units and small machines. Background technique [0002] With the increase in the capacity of air-cooled units in recent years, steam-driven feedwater pumps are all driven by steam turbines, and the common cooling methods for exhaust steam of steam-driven feedwater pump steam turbines (small machines) include wet cooling with built-in condensers and intercooling with built-in condensers , direct cooling (large machine) three types. Among them, the exhaust steam cooling method of the small machine adopts direct cooling, which has the advantages of reducing engineering investment, simple system, and increasing the annual yield of the unit. However, the air-cooled type of dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/20F22D5/18
CPCF04B49/20F22D5/18
Inventor 刘金福程江南万杰李飞于达仁
Owner NANJING POWER HORIZON INFORMATION TECH CO LTD
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