A new condensate polishing pre-filter system

Abstract

The application discloses a novel condensate water fine treatment pre-filtering system, which comprises a condensate water inlet pipeline, a novel composite filter element filter, a powder covering filter, a condensate water outlet pipeline and a condensate water bypass pipeline. The outlet of the condensate water inlet pipeline is communicated with the water inlets at the bottoms of the novel composite filter element filter and the powder covering filter, the water outlet pipelines at the bottoms of the novel composite filter element filter and the powder covering filter are communicated with the inlet of a condensate water outlet pipeline, and the condensate water inlet pipeline and the condensate water outlet pipeline are communicated through the condensate water bypass pipeline. The novel composite filter element filter in the system uses a novel composite filter element, and the unit can be operated without a membrane in a normal operation stage, and the unit can be operated with a membrane in a start-up stage or a poor condensate water quality stage, so that the operation cost is relatively low. The novel composite filter element filter and the powder resin covering filter can be used alternately or simultaneously during operation of the system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of condensate polishing treatment of power plant, and relates to a new type of condensate polishing treatment pre-filter system. BACKGROUND

[0002] At present, the powder covering filter widely used in the condensate polishing treatment system of subcritical and supercritical air-cooled units is found to have some key parameters and links in the film laying and exposing process not controlled properly in operation, which affects the film laying and exposing effect, causes the poor water quality of the filter outlet, the pollution of the filter element, the shortening of the service life and other problems. In addition, the powder covering filter lacks online monitoring equipment, and the problems such as damage of the filter element and leakage of the powder resin cannot be found in time in operation, which directly affects the safe and stable operation of the thermal system. In recent years, the events of non-stop of the unit due to the penetration of the powder resin through the filter element and the blockage of the filter screen of the subsequent feedwater pump caused by the severe fluctuation of the condensate pump flow during the start-up stage of the unit have occurred repeatedly. The powder resin covering filter only has the function of removing iron after being operated for 5-6 hours, the powder resin is a consumable for one-time use, and the powder resin is replaced by film explosion and laying after the powder filter is tripped, the procurement cost of the powder resin is an important component of the high operation cost of the powder covering filter, and in addition, the powder resin in the waste water after the film explosion is also difficult to treat.

[0003] The subcritical air-cooled unit does not have high requirements on water quality, and there is no problem of leakage of circulating water to contaminate the condensate, so most units only design the powder resin covering filter (hereinafter referred to as "single powder system") in the initial design stage, and the above-mentioned problems of the single powder system are more prominent. SUMMARY

[0004] The present application aims to overcome the above-mentioned shortcomings of the prior art, and provides a new type of condensate polishing treatment pre-filter system, which comprises a new type of composite filter element filter and a powder covering filter, the new type of composite filter element filter uses the new type of composite filter element with up-to-standard flux and high filtration efficiency, and does not need to lay film by powder resin in operation, so that the operation cost is low.

[0005] To achieve the above-mentioned purpose, the present application discloses a new type of condensate polishing treatment pre-filter system, which comprises a condensate inlet pipeline, a new type of composite filter element filter, a powder covering filter, a condensate outlet pipeline and a condensate bypass pipeline.

[0006] The outlet of the condensate water inlet pipeline is connected with the water inlet of the bottom of the new composite filter element filter and the powder covering filter, the outlet of the water outlet pipeline of the bottom of the new composite filter element filter and the powder covering filter is connected with the inlet of the water outlet pipeline of the fine treatment mother pipe, the condensate water inlet pipeline and the water outlet pipeline of the fine treatment mother pipe are connected through the condensate water bypass pipeline, the condensate water inlet pipeline is provided with a condensate water inlet valve, the water outlet pipeline of the new composite filter element filter is provided with a new composite filter element filter outlet valve, the water outlet pipeline of the powder covering filter is provided with a powder covering filter outlet valve, the water outlet pipeline of the fine treatment mother pipe is provided with a fine treatment mother pipe outlet valve, and the condensate water bypass pipeline is provided with a condensate water bypass regulating valve.

[0007] The new condensate water fine treatment pre-filter system comprises the new composite filter element filter and the powder covering filter, and the new composite filter element filter and the powder covering filter can be used alternately or simultaneously.

[0008] The new condensate water fine treatment pre-filter system has the following beneficial effects:

[0009] The new condensate water fine treatment pre-filter system comprises the new composite filter element filter and the powder covering filter, the new composite filter element filter uses the new composite filter element flux, has high filtration efficiency, does not need to be coated with powder resin during operation, saves the purchase cost of powder resin, and reduces the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The figure is a schematic view of the present application;

[0011] 1, the new composite filter element filter, 2, the powder covering filter, 3, the condensate water inlet valve, 4, the new composite filter element filter outlet valve, 5, the powder covering filter outlet valve, 6, the fine treatment mother pipe outlet valve, 7, the bypass regulating valve. DETAILED DESCRIPTION

[0012] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without making creative efforts should belong to the scope of protection of the present application.

[0013] The structural schematic diagram according to the disclosed embodiment of the application is shown in the accompanying drawings. The drawings are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and the relative size and position relationship therebetween shown in the drawings are only exemplary, and in practice, they can be deviated due to manufacturing tolerance or technical limitation, and regions / layers with different shapes, sizes and relative positions can be additionally designed according to actual needs by those skilled in the art.

[0014] Reference Figure 1 The new condensate polishing pre-filter system comprises a new composite filter element filter 1, a powder covering filter 2, a condensate water inlet valve 3, a new composite filter element filter outlet valve 4, a powder covering filter outlet valve 5, a polishing mother pipe outlet valve 6, and a bypass adjusting valve 7.

[0015] The outlet of the condensate water inlet pipeline is connected to the water inlets at the bottom of the new composite filter element filter 1 and the powder covering filter 2, the outlets of the water outlet pipelines of the new composite filter element filter 1 and the powder covering filter 2 are connected to the inlet of the polishing mother pipe outlet pipeline, the condensate water inlet pipeline and the polishing mother pipe outlet pipeline are connected through a condensate water bypass pipeline, the condensate water inlet valve 3 is arranged on the condensate water inlet pipeline, the new composite filter element filter outlet valve 4 is arranged on the water outlet pipeline of the new composite filter element filter 1, the powder covering filter outlet valve 5 is arranged on the water outlet pipeline of the powder covering filter 2, the polishing mother pipe outlet valve 6 is arranged on the polishing mother pipe outlet pipeline, and the condensate water bypass adjusting valve 7 is arranged on the condensate water bypass pipeline.

[0016] The new condensate polishing pre-filter system has the following two operation modes:

[0017] (1) One new composite filter element filter 1 and one powder covering filter 2 are used alternately: the powder covering filter 2 is used in the case of unit start or poor condensate water quality, which can protect the new composite filter element in the new composite filter element filter 1 and also has the effect of desalination; in the normal operation stage of the unit, the condensate water quality is good, the new composite filter element filter 1 is used or the two filters are used alternately, which can ensure the polishing outlet water quality, save the purchase cost of powder resin, reduce the steps of filter film laying and exposure, and save manpower.

[0018] (2) The new composite filter element filter and the powder covering filter are simultaneously operated: in the case of unit start or poor condensate water quality, both filters are operated with film laying; in the normal operation stage of the unit, the condensate water quality is good, and both filters are operated without film laying.

[0019] The new type condensate polishing pre-filter system in the present application includes one new type composite filter element filter 1 and one powder covering filter 2, and when implemented, multiple new type composite filter element filters 1 can be arranged according to the requirements of the unit.

[0020] At present, the powder covering filter is widely used in the condensate polishing system of power plants, and when the transformation is carried out, the filter element of the powder covering filter in the condensate polishing system can be replaced by the new type composite filter element, so that the new type condensate polishing pre-filter system can be operated.

[0021] The new type composite filter element filter and the powder covering filter in the present application are used in combination according to the condensate water quality, which can effectively ensure the water quality of the polishing effluent, reduce the operation cost and is simple to operate. In addition, the transformation idea is provided for the powder covering filter which is commonly used in the power plants at present.

[0022] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the equivalent, without departing from the spirit and scope of the present application, any modification or equivalent replacement which does not depart from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A method of using a novel condensate polishing prefilter system, characterized in that, The new condensate polishing pre-filter system comprises a condensate inlet pipeline, a new composite filter element filter (1), a powder covering filter (2), a polishing mother pipe outlet pipeline, a condensate outlet pipeline and a condensate bypass pipeline; The outlet of the condensate inlet pipeline is in communication with the water inlets of the new composite filter element filter (1) and the powder covering filter (2), and the outlet pipelines at the bottoms of the new composite filter element filter (1) and the powder covering filter (2) are in communication with the inlet of the condensate outlet pipeline; the condensate inlet pipeline and the condensate outlet pipeline are in communication through the condensate bypass pipeline; The new composite filter element filter (1) and the powder covering filter (2) are used one by one or simultaneously during operation. Specifically, the method comprises the following steps: When the new composite filter element filter (1) and the powder covering filter (2) are used one by one, the powder covering filter (2) is preferentially used during the starting stage or the stage of severe load fluctuation of the unit, and the new composite filter element filter (1) is used as a backup; during the normal operation stage of the unit, the two new composite filter element filters (1) and the powder covering filter (2) are alternately operated; When the new composite filter element filter (1) and the powder covering filter (2) are simultaneously used, the new composite filter element filter (1) and the powder covering filter (2) are both operated with membrane laying during the starting stage or the stage of severe load fluctuation of the unit; during the normal operation stage of the unit, the new composite filter element filter (1) and the powder covering filter (2) are both operated without membrane laying.

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