Prefilter for condensed water

Abstract

The utility model relates to the technical field of filtering equipment, in particular to a pre-filter for condensed water, which has the effects of good filtering effect and high filtering efficiency, and comprises a filtering tank body, a filtering tank cover and a filtering component, a water inlet pipe and a water outlet pipe are respectively arranged on the side surface of the filtering tank body, and a drain outlet is arranged at the lower end of the filtering tank body. A mounting seat is arranged in the filtering tank body, mounting holes are formed in the mounting seat, the filtering components are respectively arranged at the mounting holes, the interior of the filtering tank body is divided into a water inlet cavity and a water outlet cavity through the mounting seat and the filtering components, the water inlet pipe and the drain outlet are communicated with the water inlet cavity, and the water outlet pipe is communicated with the water outlet cavity. The filtering tank cover covers the upper end of the filtering tank body, an air inlet pipe and an exhaust pipe are arranged on the filtering tank cover, the filtering assembly comprises a filtering frame, a filtering element, a filtering net and an elastic filtering sleeve, the upper end of the filtering frame is fixedly arranged on the mounting base, and a filtering cavity of an annular structure is formed in the filtering frame; and the filter element is filled in the filter cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering equipment, in particular to a condensate pre-filter. Background Art

[0002] Condensate from a power plant is water that is condensed after steam passes through a steam turbine to do work. This water is usually saturated, high-temperature, softened water with a high thermal energy value. Since this water has done work in the steam turbine, its temperature and pressure have been reduced, but it still maintains a high heat content and a certain water quality standard, making it suitable for reuse as boiler feed water. The reuse of condensate requires filtration to ensure that the water quality meets the boiler feed water standard, thereby ensuring the stable operation of the boiler.

[0003] The applicant applied for a patent on August 31, 2016, entitled "A Backwashing Process for a Condensate Prefilter", which specifically discloses: a prefilter, wherein an exhaust port is provided at the top of the prefilter; a backwash water inlet is provided at the bottom of the prefilter; an air inlet is provided at the side of the prefilter; a backwash drain port is provided at the bottom of the prefilter; a particle counter is provided on the drain pipe of the backwash drain port; the backwashing process is composed of four steps: gravity drainage, oscillation drainage, oscillation water filling and prefilter water filling; after the prefilter is out of operation and pressure is released, the first step of gravity drainage is started; the first step of gravity drainage is to connect the exhaust port at the top of the prefilter to the atmosphere, and drain water from the backwash drain port of the prefilter until no water flows out of the backwash drain port and then start the second step; the second step of oscillation drainage is to introduce deionized water and oil-free compressed air into the backwash water inlet and air inlet of the prefilter respectively, and drain water from the backwash drain port of the prefilter and exhaust air from the exhaust port at the top, and the second step is executed for 30 seconds. After 120 seconds, the third step starts; the third step of oscillation water filling is to introduce deionized water and oil-free compressed air into the backwash water inlet and air inlet of the pre-filter respectively, and exhaust air from the exhaust port on the top of the pre-filter until water overflows from the exhaust port; the second and third steps are circulated repeatedly until the number of suspended particles in the backwash drainage no longer decreases, then the cycle is stopped and the fourth step starts; the fourth step of pre-filter water filling is to introduce deionized water into the backwash water inlet of the pre-filter until overflow water appears at the exhaust port on the top of the pre-filter. Its backwash effect is better, and the elution rate of pollutants in the pre-filter element can be increased by at least 1 times.

[0004] However, as the power of the equipment increases, the filtering effect and filtering efficiency of the traditional pre-filter can no longer meet the needs of the existing equipment, and the condensate pre-filter needs to be improved. Utility Model Content

[0005] Therefore, in view of the above problems, the utility model provides a condensate pre-filter with good filtering effect and high filtering efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A condensate pre-filter comprises a filter tank body, a filter tank cover and a filter assembly, wherein the sides of the filter tank body are respectively provided with a water inlet pipe and a water outlet pipe, the lower end of the filter tank body is provided with a sewage outlet, a mounting seat is provided in the filter tank body, a mounting hole is provided on the mounting seat, the filter assemblies are respectively arranged at the mounting holes, the filter tank body is divided into a water inlet chamber and a water outlet chamber by the mounting seat and the filter assembly, the water inlet pipe and the sewage outlet are connected to the water inlet chamber, the water outlet pipe is connected to the water outlet chamber, the filter tank cover is arranged at the upper end of the filter tank body, and the filter An air inlet pipe and an exhaust pipe are respectively provided on the tank cover, and the filter assembly includes a filter frame, a filter element, a filter net and an elastic filter sleeve, the upper end of which is fixedly mounted on a mounting seat. The filter frame has a filter cavity in an annular structure, the filter element is filled in the filter cavity, the filter sleeve is mounted on the filter frame, the filter sleeve has a filter hole connected to the filter cavity, a pressure balance cavity of an annular structure is formed between the filter sleeve and the filter cavity, the air inlet pipe is connected to the pressure balance cavity, the exhaust pipe is connected to the water outlet cavity, and the filter net is mounted on the filter sleeve.

[0008] Furthermore, the distance between the filter screen and the filter sleeve is 2 cm to 8 cm.

[0009] Furthermore, the filter sleeve includes a plurality of external convex portions protruding outwardly in a "C"-shaped structure and a plurality of internal convex portions protruding inwardly in a "C"-shaped structure. The external convex portions and internal convex portions are staggered along the axial direction of the filter sleeve, and adjacent external convex portions and internal convex portions are integrally connected.

[0010] Furthermore, the filter tank body is provided with an auxiliary component for facilitating the opening and closing of the filter tank cover, the auxiliary component includes a fixed seat fixedly provided on the outer side of the filter tank body, a support rod rotatably provided on the fixed seat, a threaded rod threadedly connected to the free end of the support rod, a handwheel provided at the upper end of the threaded rod, and a chain provided at the lower end of the threaded rod, and the lower end of the chain is connected to the filter tank cover.

[0011] By adopting the above-mentioned technical scheme, the beneficial effects of the utility model are as follows: in the condensate pre-filter, condensate enters the water inlet chamber from the water inlet pipe, and is then filtered in sequence through the filter screen, filter sleeve and filter element on the filter assembly, thereby improving the filtering effect and filtering efficiency. Specifically, after the impurities with larger diameters are filtered through the filter screen, the impurities with smaller direct sizes are filtered for the second time through the filter sleeve, and pressurized gas is pumped into the air inlet pipe to make the elastic filter sleeve expand and contract, thereby achieving a vibration effect, so that the impurities stuck on the filter hole fall off, and the impurities can be kept clean. The filtration efficiency on the filter sleeve is finally filtered for the third time through the filter element, which can improve the filtration effect of the condensed water. The filtered condensed water is discharged through the water outlet cavity and the water outlet pipe, and during reverse cleaning, the water inlet pipe is closed, and then the exhaust pipe is opened to balance the air pressure in the filter tank with the external air pressure, and then the drain port is opened to discharge the internal condensed water, and water is pumped from the water outlet pipe into the water outlet cavity, and then pressurized gas is pumped inward through the air inlet pipe, so that the condensed water reversely flushes the filter assembly and is discharged through the drain port, thereby realizing self-cleaning and improving convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view structural schematic diagram of an embodiment of the utility model;

[0013] Figure 2 It is a cross-sectional structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0015] The utility model embodiment is:

[0016] refer to Figure 1 and Figure 2As shown, a condensate pre-filter comprises a filter tank body 1, a filter tank cover 2 and a filter assembly 3, the sides of the filter tank body 1 are respectively provided with an inlet pipe 4 and an outlet pipe 5, the lower end of the filter tank body 1 is provided with a sewage outlet 6, a mounting seat 7 is provided in the filter tank body 1, and a mounting hole 8 is provided on the mounting seat 7, and the filter assembly 3 is respectively arranged at the mounting hole 8, and the filter tank body 1 is divided into an inlet chamber 11 and an outlet chamber 12 by the mounting seat 7 and the filter assembly 3, the inlet pipe 4 and the sewage outlet 6 are respectively communicated with the inlet chamber 11, and the outlet pipe 5 is communicated with the outlet chamber 12, the filter tank cover 2 is covered on the upper end of the filter tank body 1, and an air inlet pipe 9 and an air exhaust pipe 10 are respectively provided on the filter tank cover 2, the filter tank body 1 is provided with a filter housing 10, and the filter housing 1 is provided with a filter housing 10. The filter assembly 3 includes a filter frame 31, a filter element 32, a filter net 33 and an elastic filter sleeve 34, the filter sleeve 34 is made of rubber material, the filter frame 31 has a filter cavity 35 with an annular structure, the filter element 32 is filled in the filter cavity 35, the filter element 32 is made of activated carbon material, the filter sleeve 34 is sleeved on the filter frame 31, the filter sleeve 34 has a filter hole 36 connected to the filter cavity 35, a pressure balance cavity 37 with an annular structure is formed between the filter sleeve 34 and the filter cavity 35, the air inlet pipe 9 is connected to the pressure balance cavity 37, the exhaust pipe 10 is connected to the water outlet cavity 12, and the filter net sleeve 33 is arranged on the filter sleeve 34.

[0017] In the condensate pre-filter, condensate enters the water inlet chamber 11 through the water inlet pipe 4, and is filtered in sequence through the filter screen 33, the filter sleeve 34 and the filter element 32 on the filter assembly 3, thereby improving the filtering effect and filtering efficiency. Specifically, after the impurities with larger diameters are filtered through the filter screen 33, the impurities with smaller direct sizes are filtered for the second time through the filter sleeve 34, and pressurized gas is pumped into the air inlet pipe 9, so that the elastic filter sleeve 34 expands and contracts, realizing the vibration effect, so that the impurities stuck on the filter hole 36 fall off, which can maintain the filtering efficiency on the filter sleeve 34. , and finally, the third filtration is performed through the filter element 32, which can improve the filtering effect of the condensed water. The filtered condensed water is discharged through the water outlet chamber 12 and the water outlet pipe 5, and when reverse cleaning, the water inlet pipe is closed, and then the exhaust pipe 10 is opened to balance the air pressure in the filter tank body 1 with the external air pressure, and then the sewage outlet 6 is opened to discharge the internal condensed water, and water is pumped into the water outlet chamber 12 through the water outlet pipe, and then pressurized gas is pumped inward through the air inlet pipe 9, so that the condensed water reversely washes the filter component 3, and then is discharged through the sewage outlet 6, thereby realizing self-cleaning and improving the convenience of use.

[0018] Furthermore, the distance between the filter screen 33 and the filter sleeve 34 is 2 cm to 8 cm, preferably 5 cm, which provides expansion and contraction space for the filter sleeve 34 and can achieve pressure balance during the filtering process, thereby improving the filtering efficiency.

[0019] In this embodiment, the filter sleeve 34 includes a plurality of outer convex portions 341 protruding outward in a "C"-shaped structure and a plurality of inner convex portions 342 protruding inward in a "C"-shaped structure. The outer convex portions 341 and the inner convex portions 342 are staggered along the axial direction of the filter sleeve 34, and adjacent outer convex portions 341 and inner convex portions 342 are integrally connected. In this way, when the pressure in the pressure balance chamber 37 increases or decreases, the filter sleeve 34 is expanded outward or inward, and the contact area with the condensed water is increased, thereby increasing the filtration area and increasing the flow rate of the condensed water, thereby maintaining the pressure in the pressure balance chamber, improving the filtration effect, and being able to form a vibration effect to reduce the adhesion of impurities and ensure the filtration efficiency.

[0020] In addition, the filter tank body 1 is provided with an auxiliary component 20 for facilitating the opening and closing of the filter tank cover 2. The auxiliary component 20 includes a fixed seat 201 fixedly arranged on the outer surface of the filter tank body 1, a support rod 202 rotatably arranged on the fixed seat 201, a threaded rod 203 threadedly connected to the free end of the support rod 202, a handwheel 204 arranged at the upper end of the threaded rod 203 and a chain 205 arranged at the lower end of the threaded rod. The lower end of the chain 205 is connected to the filter tank cover 2. By rotating the handwheel 204, the threaded rod 203 moves up and down, thereby driving the filter tank cover 2 to rise or fall, which is convenient for the transfer of the filter tank cover 2 and improves the convenience of opening and closing.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A condensate pre-filter, characterized in that: The invention comprises a filter tank body, a filter tank cover and a filter assembly, wherein the sides of the filter tank body are respectively provided with a water inlet pipe and a water outlet pipe, the lower end of the filter tank body is provided with a sewage outlet, a mounting seat is provided in the filter tank body, a mounting hole is provided on the mounting seat, the filter assemblies are respectively arranged at the mounting holes, the filter tank body is divided into a water inlet cavity and a water outlet cavity by the mounting seat and the filter assembly, the water inlet pipe and the sewage outlet are communicated with the water inlet cavity, the water outlet pipe is communicated with the water outlet cavity, the filter tank cover is arranged at the upper end of the filter tank body, and the filter tank cover is respectively provided with There are an air inlet pipe and an exhaust pipe, and the filter assembly includes a filter frame, a filter element, a filter net and an elastic filter sleeve, the upper end of which is fixed on a mounting seat, the filter frame has a filter cavity with an annular structure, the filter element is filled in the filter cavity, the filter sleeve is mounted on the filter frame, the filter sleeve has a filter hole connected to the filter cavity, a pressure balance cavity of an annular structure is formed between the filter sleeve and the filter cavity, the air inlet pipe is connected to the pressure balance cavity, the exhaust pipe is connected to the water outlet cavity, and the filter net is mounted on the filter sleeve.

2. The condensate pre-filter according to claim 1, characterized in that: The distance between the filter screen and the filter sleeve is 2 cm to 8 cm.

3. The condensate pre-filter according to claim 1 or 2, characterized in that: The filter sleeve includes a plurality of outer convex parts protruding outwardly in a "C"-shaped structure and a plurality of inner convex parts protruding inwardly in a "C"-shaped structure. The outer convex parts and inner convex parts are staggered along the axial direction of the filter sleeve, and adjacent outer convex parts and inner convex parts are integrally connected.

4. The condensate pre-filter according to claim 3, characterized in that: The filter tank body is provided with an auxiliary component for facilitating the opening and closing of the filter tank cover, the auxiliary component includes a fixed seat fixedly arranged on the outer side of the filter tank body, a support rod rotatably arranged on the fixed seat, a threaded rod threadedly connected to the free end of the support rod, a handwheel arranged at the upper end of the threaded rod and a chain arranged at the lower end of the threaded rod, and the lower end of the chain is connected to the filter tank cover.

Images