CN-122015112-A - Rotor compartment structure, bidirectional sealing air preheater and air preheater gap adjusting method

CN122015112ACN 122015112 ACN122015112 ACN 122015112ACN-122015112-A

Abstract

The invention relates to the technical field of air preheater gap adjustment, and mainly discloses a rotor compartment structure, a bidirectional sealing air preheater and an air preheater gap adjustment method, wherein the compartment structure comprises first partition plates which are symmetrical and are arranged in an included angle mode, second partition plates are arranged between the first partition plates, first ends of the first partition plates and first ends of the second partition plates extend and meet at one point, second ends of the first partition plates and the second partition plates respectively extend to form a sector area, third partition plates are arranged on two sides of the second partition plates, the third partition plates are parallel to the second partition plates, the first ends of the third partition plates are connected with fourth partition plates, and the second ends of the third partition plates are positioned on the arc outer edges of the sector area.

Inventors

LI CHANGWU
JIN ZHIPENG
LI LONG
YANG YONGQUAN
YIN PENGFEI
ZHAO CHONGYU

Assignees

华能酒泉发电有限公司

Dates

Publication Date: 20260512
Application Date: 20260409

Claims (10)

1. A rotor compartment structure is characterized by comprising, The first partition boards (100) are symmetrically arranged at an included angle, the second partition boards (200) are arranged between the first partition boards (100), the first ends of the first partition boards (100) and the second partition boards (200) are extended and converged at one point, the second ends are respectively extended and form a sector area, The two sides of the second partition board (200) are provided with third partition boards (300), the third partition boards (300) are parallel to the second partition board (200), the first ends of the third partition boards are connected with fourth partition boards (400), and the second ends of the third partition boards are positioned on the arc outer edges of the fan-shaped areas; the fourth partition board (400) is vertically connected with the second partition board (200) along the extending direction of the second partition board (200) to form a plurality of groups, two ends of the fourth partition board (400) are also fixedly connected with the first partition board (100), and a partition (A) for installing a heat exchange unit is formed between the partition boards.
2. The rotor-compartment structure according to claim 1, characterized in that the angle formed between the first partition plates (100) is 15 °, and the angle formed between the first partition plates (100) and the second partition plates (200) is 7.5 °; The area formed between the first partition plate (100) and the second partition plate (200) is a compartment area (B), the compartment areas (B) are symmetrically distributed on two sides of the second partition plate (200), and the compartment (A) is located in the compartment area (B).
3. The rotor compartment structure according to claim 2, characterized in that only one fourth partition plate (400) of the third partition plates (300) at both sides of the second partition plate (200) with the first end fixed is a partition plate (401), and the partition plate (401) partitions the compartment area (B) to form a first compartment area (B1) and a second compartment area (B2); the first bin areas (B1) are symmetrically distributed on two sides of the second partition board (200), and the second bin areas (B2) are symmetrically distributed on two sides of the second partition board (200).
4. The rotor compartment structure according to claim 3, characterized in that a straight line extending in a direction perpendicular to the second partition plate (200) is a first direction line (X1), one compartment (A) is provided along the first direction line (X1) in the first compartment area (B1) on one side of the second partition plate (200), and two compartments (A) are provided along the first direction line (X1) in the second compartment area (B2) on one side of the second partition plate (200).
5. The rotor compartment structure according to any one of claims 1 to 4, wherein radial sealing plates (101 a) are fixed at the ends of the first partition plate (100) and the second partition plate (200) close to the cold end and the hot end of the rotor; The second end parts of the first partition plate (100) and the second partition plate (200) are also fixed with a sealing side plate (101 b).
6. The bidirectional sealing air preheater is characterized by comprising a rotor compartment structure (G) and further comprising, The rotor compartment structure (G) is circumferentially distributed in the shell assembly (500), and is fixed end to form an annular rotor structure; The shell assembly (500) is also fixedly provided with a first sub-bin sector plate (501) and a second sub-bin sector plate (502), and the first sub-bin sector plate (501) and the second sub-bin sector plate (502) divide the inner area of the shell assembly (500) to form corresponding areas of a flue gas side, a primary air side and a secondary air side; wherein the first sub-bin sector plate (501) and the second sub-bin sector plate (502) at least cover two radial sealing plates (101 a) at the same time; The shell assembly (500) is fixedly provided with an axial sealing plate (600) corresponding to the inner wall connected with the first sub-bin sector plate (501) and the second sub-bin sector plate (502), and the axial sealing plate (600) at least covers two sealing side plates (101 b) at the same time.
7. The bidirectional sealed air preheater according to claim 6, wherein in the circumferentially arranged rotor compartment structures (G), two adjacent groups of rotor compartment structures (G) share a first partition plate (100).
8. The bidirectional sealed air preheater according to claim 6 or 7, wherein the outer wall of the axial sealing plate (600) is fixed with the shell component (500) through a fixing component (601), the fixing component (601) comprises symmetrically arranged mounting bases (601 a), one end of each mounting base (601 a) is fixed with the inner wall of the shell component (500), and the other end of each mounting base is fixed with an adjusting column (601 b) and a wing plate component (601 c); The end part of the adjusting column (601 b) is fixed with a butt joint transverse plate (601 b-1), and the butt joint transverse plate (601 b-1) is fixed with the outer wall of the axial sealing plate (600) through a connecting rib plate (601 b-2); The wing plate assembly (601 c) comprises a connecting plate (601 c-1), a side wing plate (601 c-2) and a sealing plate rib plate (601 c-3), and the sealing plate rib plate (601 c-3) is fixed with the outer wall of the axial sealing plate (600) through an end plate (601 c-4).
9. A gap adjusting method of an air preheater is characterized by being applied to the bidirectional sealing air preheater disclosed in any one of claims 6-8, and comprising the following steps: positioning an axial sealing plate (600) through an axial sealing setting rod, detecting through a sealing gap measuring instrument, uniformly polishing and supporting the circumferential gaps between the axial sealing plate (600) and the outer circumferential surface of a rotor compartment structure (G) in a regulating mode, and rechecking after welding and fixing; correcting the coaxiality of the rotor by utilizing a rotor hydraulic jack, positioning a first sub-bin sector plate (501) and a second sub-bin sector plate (502) by a radial seal setting rod, rotating the rotor to detect radial gaps at different angles, and finely adjusting supporting bolts for supporting the first sub-bin sector plate (501) and the second sub-bin sector plate (502) to ensure that the gap deviation reaches the standard; And the fit clearance between the partition plate fixed on the first partition sector plate (501) and the second partition sector plate (502) and the inner wall of the shell assembly (500) is controlled, the adjustment is carried out by filling and edge polishing through the sealing plate, the supporting height of the partition plate reinforcing ribs is adjusted, and the radial clearance between the partition plate and the outer edge of the rotor partition structure (G) is ensured to meet the rotor rotation requirement.
10. The method for adjusting the gap of the air preheater according to claim 9, wherein the preset initial gap of the axial sealing plate (600) is 0.5-2 mm, and the deviation of the full circumferential gap after welding is less than or equal to 0.3mm; After the rotor hydraulic jack is corrected, the coaxiality error of the rotor is less than or equal to 0.1mm/m, and the preset range of the radial sealing gap is 0.8-3 mm; The fit clearance between the partition plate and the inner wall of the shell assembly (500) is less than or equal to 0.5mm, and the radial clearance between the partition plate and the edge of the rotor partition structure (G) is 0.3-1 mm; Measuring the gap between the axial sealing plate (600) and the whole circumferential gap of the outer circumferential surface of the rotor compartment structure (G), measuring each gap for 3 times, taking an average value, detecting radial gaps step by step at intervals of 10 degrees when rotating the rotor, and correcting the lower end surfaces of the fan-shaped plates by grinding if the whole gaps are out of tolerance; All gaps are adjusted and reserved for 0.2-0.5 mm of thermal expansion; the partition plate comprises a first partition plate for separating the total partition side formed by the flue gas side, the primary air side and the secondary air side, and a second partition plate for separating the primary air side and the secondary air side, and the fit clearance between the two partition plates is independently adjusted; Wherein, first sub-storehouse baffle is fixed in first sub-storehouse sector plate (501) corresponding position, and second sub-storehouse baffle is fixed in second sub-storehouse sector plate (502) corresponding position.

Description

Rotor compartment structure, bidirectional sealing air preheater and air preheater gap adjusting method Technical Field The invention relates to the technical field of air preheater gap adjustment, in particular to a rotor compartment structure, a bidirectional sealing air preheater and an air preheater gap adjustment method. Background The rotary air preheater is key heat exchange equipment in the fields of thermal power and the like, the sealing performance of the rotary air preheater directly influences heat exchange efficiency and energy consumption, the stability of the running state, the monitoring and regulation suitability of parameters of the rotary air preheater are the core foundation for realizing accurate monitoring, stable control and efficient energy-saving management of a power plant. As one of the core functional departments of the power plant, the thermal control department is responsible for monitoring, automatically adjusting and interlocking protecting the operation parameters of key equipment comprising the air preheater, and the sealing state, gap fluctuation and other data of the air preheater need to be effectively cooperated with the thermal control system to provide reliable support for closed loop control of the whole production system. In the prior art, a single-channel radial sealing plate is adopted for a partition sector plate of an air preheater, an axial sealing plate also only correspondingly covers a single-channel sealing side plate, gap loopholes are easily formed at the joint of sealing pieces, so that the smoke and air channeling and air leakage rate are high, and more importantly, the static design of the sealing structure does not fully consider the monitoring and regulation requirements of a thermal control department, and has obvious adaptation defects that on one hand, when a rotor runs, micro deformation and vibration are easily generated due to temperature fluctuation and airflow impact, the contact range of single-channel sealing is limited, gap change under dynamic working conditions cannot be adapted, the existing structure lacks collaborative design of thermal control points such as temperature, pressure and differential pressure, real-time fluctuation of sealing gaps is difficult to be accurately captured, continuous and reliable monitoring data cannot be provided for the thermal control department, and the regulation and control precision is influenced, on the other hand, the traditional sealing structure does not reserve an adaptation space for a thermal control automatic regulating loop and an interlocking protection logic, the thermal control department cannot easily realize prejudgement and intervention of a sealing state through parameter feedback, the heat exchange failure efficiency of the air preheater cannot be avoided, and the thermal control failure efficiency is difficult to further realize optimizing heat consumption indexes through the thermal control. Disclosure of Invention Therefore, the invention aims to solve the technical problems that the existing air preheater is easy to form clearance loopholes in single-channel sealing coverage, high in air leakage rate and insufficient in dynamic working condition adaptability and sealing reliability. The technical problem is solved by the technical scheme that the rotor compartment structure comprises first partition plates which are symmetrical and are arranged at an included angle, second partition plates are arranged between the first partition plates, the first end of each first partition plate is extended and intersected with the first end of each second partition plate, the second ends of each second partition plate are respectively extended and form a sector area, third partition plates are arranged on two sides of each second partition plate and are parallel to the second partition plates, the first ends of the third partition plates are connected with fourth partition plates, the second ends of the third partition plates are located on the arc outer edges of the sector areas, a plurality of groups of fourth partition plates are vertically connected with the second partition plates along the extending direction of the second partition plates, two ends of each fourth partition plate are fixedly connected with the first partition plates, and compartments for installing heat exchange units are formed between the partition plates. In a preferred embodiment of the rotor compartment structure, an included angle formed between the first partition plates is 15 degrees, an included angle formed between the first partition plates and the second partition plates is 7.5 degrees, a compartment area is formed between the first partition plates and the second partition plates, the compartment areas are symmetrically distributed on two sides of the second partition plates, and the compartments are located in the compartment area. In a preferred embodiment of the rotor compartment structure, only one four