A novel spraying/negative-pressure secondary dust suppression device used in fully mechanized mining face: A case study

2016 ◽  
Vol 103 ◽  
pp. 126-135 ◽  
Author(s):  
Wen Nie ◽  
Xiao Ma ◽  
Weimin Cheng ◽  
Yanghao Liu ◽  
Lin Xin ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Dust Suppression ◽  
Mining Face

scholarly journals Dust Concentration Changing Regularities and Dust Reduction Technology by Spray Negative Pressure in Fully Mechanized Mining Face

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Lirong Wu ◽  
Hongxuan Chen ◽  
Jiamin Li ◽  
Shican Fu ◽  
Yuyan Zhuang
Keyword(s):  
Negative Pressure ◽  
Flow Characteristics ◽  
Dust Concentration ◽  
Inlet Section ◽  
Coal Face ◽  
Dust Suppression ◽  
Mining Face ◽  
Dust Distribution ◽  
Dust Reduction ◽  
Ventilation Velocity

The dust concentration changing regularities are the basis to take dust depression measures, which is greatly influenced by the airflow. In the software of FLUENT, the value of ventilation velocity is set as a constant, which cannot express the real ventilation. According to the flow characteristics of the sublayer and data from Nicholas’ experiment, the ventilation velocity distribution formula of sublayer in the inlet section of fully mechanized caving coal face is deduced. The boundary condition of velocity is given by UDF. Taking the 3top1110 fully mechanized caving coal face as an example, the dust distribution in the process of coal mining and hydraulic support shifting was studied. According to the dust-spray coupling experiment, three types of nozzle are chosen based on the efficiency of dust suppression. Combining the dust migration rule and the characteristics of nozzles, the negative pressure-secondary dust suppression devices of spray were developed and applied. And the above measures have lowered the dust concentration effectively.

scholarly journals Case Study: Acute Lumbar Paraspinal Compartment Syndrome in an Austere Military Environment

2020 ◽  
Author(s):  
Pete Allen ◽  
Jackson Pugh ◽  
Alexander Blau
Keyword(s):  
Compartment Syndrome ◽  
Negative Pressure ◽  
Negative Pressure Wound Therapy ◽  
Limited Resources ◽  
Paraspinal Muscles ◽  
Medical Department ◽  
Wound Therapy ◽  
Lower Back ◽  
Lumbar Paraspinal Muscles

ABSTRACT The incidence of compartment syndrome of the lumbar paraspinal muscles is exceedingly rare. Approximately 24 hours following a high-intensity kettlebell swing workout, a 33-year-old Sailor presented to the medical department on board a forward deployed Wasp-class amphibious assault ship with increasing discomfort in his middle and lower back, and evidence of rhabdomyolysis. Discomfort quickly turned to unrelenting pain coupled with dorsal paresthesias and rigidity in the paraspinal muscles. He was taken emergently to the operating room, where his paraspinal muscles were released via fasciotomy. As a result of limited resources aboard the deployed ship, a negative pressure wound dressing was fashioned using the supplies available aboard the ship. Following 3 days of the negative pressure wound therapy, muscle bulging decreased substantially, and the skin was closed. After 4 weeks of physical therapy, he returned to full duty.

Management of a complex hind foot war injury with negative pressure wound therapy: A case study

The Foot ◽  
2009 ◽  
Vol 19 (3) ◽  
pp. 177-180 ◽  
Author(s):  
T.J. Bonner ◽  
A. Mountain ◽  
K. Allison ◽  
I. Sargent ◽  
S. Adedapo
Keyword(s):  
Negative Pressure ◽  
Negative Pressure Wound Therapy ◽  
Wound Therapy ◽  
Hind Foot

Autologous fat grafting combined with negative pressure wound therapy in severe diabetic foot ulcer: a case study

2021 ◽  
Vol 30 (Sup4) ◽  
pp. S38-S40
Author(s):  
Zheng Biyao ◽  
Xu Gang ◽  
Jiang Hai ◽  
Duan Chenwang ◽  
Liu Xuan
Keyword(s):  
Negative Pressure ◽  
Diabetic Foot ◽  
Negative Pressure Wound Therapy ◽  
Foot Ulcer ◽  
Fat Grafting ◽  
Autologous Fat Grafting ◽  
Wound Therapy ◽  
Autologous Fat ◽  
Split Thickness Skin Grafting

Objective: Hard-to-heal wounds are a surgical challenge, and diabetic foot ulcers (DFUs) are one of the most common and severe varieties. Previous studies have shown that autologous fat grafting (AFG) and negative pressure wound therapy (NPWT) have the potential to promote wound healing. This case study describes how these two methods together helped in the healing of a serious DFU. Case history: A 65-year-old female patient had a severe DFU on her right foot, with a 30-year history of disease and renal failure. By the time symptoms were evident, regular dressing changes and antibiotic treatment were inadequate. She received surgical debridement, AFG and NPWT. Finally, as the granulation tissue covered the full wound bed, the wound was closed by split-thickness skin grafting. One month later, the DFU was fully healed with no recurrences. Conclusion: The application of AFG or components of adipose tissue to treat hard-to-heal wounds has been researched at both the molecular level and in clinic. In this case, we have proved the curative effect of jointly using AFG and NPWT.

scholarly journals Experimental Research and Numerical Simulation of Ejector Precipitator in a Fully Mechanized Mining Face

2020 ◽  
Vol 45 (11) ◽  
pp. 9815-9833
Author(s):  
Guodong Zhai ◽  
Wentao Zhang ◽  
Yaozong Li ◽  
Xinghao Lu ◽  
Wenyuan Hu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Negative Pressure ◽  
Coal Dust ◽  
Structural Parameters ◽  
Dust Concentration ◽  
Dust Removal ◽  
Measuring Point ◽  
Mining Face ◽  
Supply Water

AbstractIn order to effectively reduce the coal dust concentration in a fully mechanized mining face, this research used laboratory experiment, numerical simulation, and field test to conduct an in-depth exploration of the ejector precipitator installed at the low-level caving coal hydraulic support. Firstly, through the experimental platform in the laboratory, the dust removal effect of the nozzle with different structural parameters was tested, and the 3D particle dynamic analyzer was adopted to verify its atomization characteristics; then, the structural parameters corresponding to the nozzle in the best test results were obtained. Secondly, by using Fluent, the negative pressure flow field in the ejector barrel was numerically simulated. The results indicated that when the pressure of supply water was 12 MPa, the negative pressure value formed in the flow field was the lowest and the inspiratory velocity was the largest, which was conducive to dust removal. Finally, the tests of liquid–gas ratio and dust removal ratio were carried out in a fully mechanized mining face. The results showed that when the nozzle specification recommended by the experiment and the pressure of supply water recommended by the numerical simulation were used, the removal ratios of the total coal dust and the respirable coal dust were 89.5% and 91.0%, respectively, at the measuring point of the highest coal dust concentration. It indicates that the ejector precipitator has a good application effect in reducing the coal dust concentration in a fully mechanized mining face and improving the work environment of coal mine workers.

scholarly journals Design and Operation of a Modern Polish Plant for Plastic Waste Recycling through the Degradative Depolymerization Process. A Case Study

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6620 ◽  
Author(s):  
Andrzej Duda ◽  
Arkadiusz Fenicki ◽  
Patryk Molski ◽  
Elżbieta Szostak ◽  
Piotr Duda
Keyword(s):  
Negative Pressure ◽  
Waste Recycling ◽  
Considerable Reduction ◽  
Industrial Scale ◽  
Process Safety ◽  
Innovative Solutions ◽  
Plastic Waste Recycling ◽  
High Level ◽  
Two Stages

The paper describes an installation for the degradative depolymerization of polyolefin materials obtained from wastes, hereinafter also referred to as depolymerization for simplicity. The plant, on an industrial scale, is one of the few operating in Poland. However, it is one of the most modern plants in this industry. Design solutions, construction of particular technological lines, compliance with national and EU regulations and the high level of process safety were described in this paper as well as compared to other plants of this type in Poland. Different solutions were presented in drawings and photos of the plant and in fragmentary technological diagrams. The types of waste and the methods of their processing by the plant were also characterized in accordance with the applicable regulations. The waste throughput is from 2000 to 4000 kg/h, while the efficiency of the depolymerization installation itself is 1500 kg/h. The industrial-scale depolymerization process is carried out in one or two stages: by homogenization (extraction) at a temperature up to 200 °C and depolymerization at temperatures up to 400 °C. The obtained products (energy goods) are sold for further processing. The processes, devices and methods are characterized by novel, innovative solutions, covered by a number of patents, which are also described below. The advantage of the presented technology is the substantial simplification of the process and thereby a considerable reduction in investment costs. Among others, the processes of distillation and rectification (low- and negative-pressure) were abandoned.

Comprehensive Treatment of Single Finger Frostbite: A Case Study

2020 ◽  
Author(s):  
Yonghu Zhang ◽  
Jintong Song ◽  
Guobao Huang
Keyword(s):  
Negative Pressure ◽  
Index Finger ◽  
Critical Time ◽  
Comprehensive Treatment ◽  
Wound Treatment ◽  
Fourth Degree ◽  
Single Finger ◽  
Comprehensive Treatments ◽  
Papaverine Hydrochloride

Abstract Third- and fourth-degree frostbites usually result in loss of skin and tissue requiring amputation, and scarring. The 3- to 6-week waiting period is often necessary to determine the severity of the lesion. This period is also a critical time for the rescue of frostbitten tissue. This patient was a 30-year-old man who developed frostbite of his right index finger. He presented to our hospital 4 hours after injury with loss of sensation on the whole index finger and early signs of necrosis. The patient received a series of comprehensive treatments, including fasciotomy, injection of papaverine hydrochloride, baking lamp irradiation, and negative pressure treatment. At the time of discharge, he had re-epithelialization of the index finger by 21 days after injury. The conclusion of this paper is that the comprehensive treatments combined with negative pressure wound treatment has certain clinical application value for the rescue of deep frostbite tissues.

The Internal Negative Pressure Wound Control System: A Paradigm Shift for Promoting Deep Space Healing in Complex Surgically Created Wounds

2021 ◽  
Author(s):  
Kenneth C Shestak
Keyword(s):  
Negative Pressure ◽  
Negative Pressure Wound Therapy ◽  
New Technology ◽  
Deep Space ◽  
Deep Tissue ◽  
System A ◽  
Wound Healing Problems ◽  
Novel Design ◽  
Complex Wounds

Abstract This article introduces a new technology to minimize seroma and promote more predictable healing in surgically created deep space wounds. Its novel design internalizes the delivery of a continuously generated high negative pressure (-125 mmHg) throughout the surgically created space using multi-branching Manifolds. In a small prospective cohort case study of 24 patients undergoing full abdominoplasty, all patients had placement of this device which was removed 7 days postoperatively. Results at 30 days revealed no evidence of wound healing problems, no clinical seroma and no device malfunction. The internalization of a constant negative pressure wound therapy (NPWT) provided by this system has the potential to significantly reduce clinical seroma, and to produce more consistent apposition of interfaces in deep tissue spaces in complex wounds seen in plastic surgery and other surgical disciplines.

scholarly journals Use of negative pressure wound therapy in a chronic leg wound with coexisting rheumatoid arthritis: a case study

2018 ◽  
Vol 46 (6) ◽  
pp. 2495-2499
Author(s):  
Dariusz Bazaliński ◽  
Paweł Więch ◽  
Beata Barańska ◽  
Monika Binkowska-Bury
Keyword(s):  
Rheumatoid Arthritis ◽  
Wound Healing ◽  
Steroid Therapy ◽  
Negative Pressure ◽  
Negative Pressure Wound Therapy ◽  
Bacterial Count ◽  
Wound Therapy ◽  
Chronic Ulceration

We present a case of a 69-year-old woman with rheumatoid arthritis. The patient’s condition was managed with steroid therapy for more than 12 years. She had a coexisting infected chronic ulceration in the left leg, which was treated with negative pressure wound therapy for 52 days. Use of this therapy within the wound reduced exudate and the bacterial count, which dramatically accelerated the process of wound healing.

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