300MW火电机组脱水仓析水滤网堵塞分析及改进

文章针对大唐三门峡华阳发电有限责任公司2×320MW机组除渣系统脱水仓放渣不畅、滤网堵塞、仓壁结垢等问题,直接影响设备安全稳定投运而策划。通过对TCS-10型脱水仓原生产厂家设计理念、设备结构的研究,再结合运行、检修等方面存在问题的分析论证,最后经对渣浆泵前池增加排污泵、脱水仓增加滤网反冲洗喷嘴数量和喷嘴型号、优化脱水仓放渣运行程序等,从而解决了脱水仓滤网堵塞、析水不畅的问题,脱水效率明显提高,既消除了机组带水放渣,污染地面等环保超标隐患,又保证了机组安全经济运行。

320MW机组除渣系统脱水仓析水效率低优化探索

本文针对大唐三门峡华阳发电有限责任公司2×320MW机组除渣系统脱水仓放渣不畅、滤网堵塞、仓壁结垢、设备老旧、腐蚀严重等问题,直接影响设备安全稳定运行而策划。通过对TCS-10型脱水仓原生产厂家设计理念、设备结构的研究,再结合运行等方面存在问题的分析论证,最后经对原中心滤网及周边滤网析水功能的恢复,增设冲洗水泵和对冲洗水控制系统的优化等方法,从而解决了脱水仓析水不畅的问题,脱水效率明显提高,既消除了机组带水放渣,污染地面等环保超标隐患,有保证了机组安全经济运行。

320 MW火电机组除渣系统脱水仓滤网堵塞及放渣不畅原因分析及优化探索

大唐三门峡华阳发电有限责任公司2×320 MW机组除渣系统存在脱水仓放渣不畅、滤网堵塞、仓壁结垢、设备老旧、腐蚀严重等问题,直接影响设备安全稳定运行。现通过研究TCS-10型脱水仓原生产厂家设计理念、设备结构,再结合运行等方面存在问题的分析论证,最后采用恢复原中心滤网及周边滤网析水功能,在脱水仓6 m平台增设两台升压水泵,在渣浆前池增加两台排污泵和优化冲洗水控制系统等方法,解决了脱水仓析水不畅、放渣困难的问题,脱水仓工作效率明显提高,既消除了脱水仓带水放渣,污染地面等环保超标隐患,又有力保证了机组安全经济运行。

除渣系统脱水仓运行中存在问题及解决方法

对某电厂锅炉除渣系统脱水仓析水效果下降的原因进行了分析,提出并实现了对析水板结垢和变形、反冲洗喷嘴堵塞等问题的解决措施。实施后,提高了脱水效率,延长了设备使用寿命。

Numerical Analysis of the Flow Field in a Sloshing Tank with a Horizontal Perforated Plate

Liquid sloshing is a type of free surface flow inside a partially filled water tank.Sloshing exerts a significant effect on the safety of liquid transport systems;in particular,it may cause large hydrodynamic loads when the frequency of the tank motion is close to the natural frequency of the tank.Perforated plates have recently been used to suppress the violent movement of liquids in a sloshing tank at resonant conditions.In this study,a numerical model based on OpenF OAM(Open Source Field Operation and Manipulation),an open source computed fluid dynamic code,is used to investigate resonant sloshing in a swaying tank with a submerged horizontal perforated plate.The numerical results of the free surface elevations are first verified using experimental data,and then the flow characteristics around the perforated plate and the fluid velocity distribution in the entire tank are examined using numerical examples.The results clearly show differences in sloshing motions under first-order and third-order resonant frequencies.This study provides a better understanding of the energy dissipation mechanism of a horizontal perforated plate in a swaying tank.

Probability Analysis of the Wave-Slamming Pressure Values of the Horizontal Deck with Elastic Support

This paper presents the probability distribution of the slamming pressure from an experimental study of regular wave slamming on an elastically supported horizontal deck. The time series of the slamming pressure during the wave impact were first obtained through statistical analyses on experimental data. The exceeding probability distribution of the maximum slamming pressure peak and distribution parameters were analyzed, and the results show that the exceeding probability distribution of the maximum slamming pressure peak accords with the three-parameter Weibull distribution. Furthermore, the range and relationships of the distribution parameters were studied. The sum of the location parameter D and the scale parameter L was approximately equal to 1.0, and the exceeding probability was more than 36.79% when the random peak was equal to the sample average during the wave impact. The variation of the distribution parameters and slamming pressure under different model conditions were comprehensively presented, and the parameter values of the Weibull distribution of wave-slamming pressure peaks were different due to different test models. The parameter values were found to decrease due to the increased stiffness of the elastic support. The damage criterion of the structure model caused by the wave impact was initially discussed, and the structure model was destroyed when the average slamming time was greater than a certain value during the duration of the wave impact. The conclusions of the experimental study were then described.

Effect of ageing temperature on precipitation of A1-Cu-Li-Mn-Zr alloy

The precipitation behaviors of an A1-Cu-Li-Mn-Zr alloy at different ageing temperatures （120, 160 and 200 ~C） were investigated using Vickers hardness measurements and transmission electron microscopy （TEM） characterization. Age hardening curves show an increase in precipitation kinetics with increasing ageing temperature. The results of TEM show that for the samples peak aged at 120 ~C, the amount of g＇ （A13Li）, GP zones/0＇ （A12Cu） and Z （A15Cu6Li2） phases is obviously higher than that of T1 （A12CuLi） precipitates; while the samples peak aged at 160 and 200 ~C are usually dominated by T1 phase with a minor fraction of GP zones/0＇ and g＇, and the Z phase almost does not form. In addition, quantitative analysis on the T1 platelets demonstrates that the samples peak aged at 200 ~C have larger plate diameter and smaller area fraction of T1, as compared to the samples peak aged at 160 ~C. Correspondingly, the possible reasons for such phenomena are discussed.

Hydroelastic Analysis of a Very Large Floating Structure Edged with a Pair of Submerged Horizontal Plates

This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin's method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.

Influence of precipitation on recrystallization texture of AA3104 aluminum alloy

The development of the recrystallization texture of the alloy AA3104 was investigated by analysis of orientation distribution functions determined by X-ray diffraction,supported by EBSD local texture analysis.A typical β-fiber with nearly 20%Bs orientation {011}211 was detected in the final hot rolled sheet.At the beginning of annealing at 350 ℃,the cube component{001}100 got a sharp increase.TEM results show that the growth of both number and size of precipitation appears to inhibit the advantage of Cube orientation {001}100 notably after annealing at 350 ℃ for 15 min.Finally,it comes out to be a random distributed orientation by full recry stallization.

Analytic approximation to nonlinear hydroelastic waves traveling in a thin elastic plate floating on a fluid

An analytic approximation method known as the homotopy analysis method(HAM)is applied to study the nonlinear hydroelastic progressive waves traveling in an infinite elastic plate such as an ice sheet or a very large floating structure(VLFS)on the surface of deep water.A convergent analytical series solution for the plate deflection is derived by choosing the optimal convergencecontrol parameter.Based on the analytical solution the efects of diferent parameters are considered.We find that the plate deflection becomes lower with an increasing Young’s modulus of the plate.The displacement tends to be flattened at the crest and be sharpened at the trough as the thickness of the plate increases,and the larger density of the plate also causes analogous results.Furthermore,it is shown that the hydroelastic response of the plate is greatly afected by the high-amplitude incident wave.The results obtained can help enrich our understanding of the nonlinear hydroelastic response of an ice sheet or a VLFS on the water surface.