4000×3000×3000 Vacuum Drying Furnace For Oil Type Power Transformer

KD-4000×3000×3000

Transformer vacuum LPG drying equipment

Technical proposal and quotation

 

 

The Variable pressure vacuum drying equipment is manufactured by our company according to the German expert J The drying principle proposed by Dr. Moore (DR, MOLL) is developed based on our experience in the design and manufacture of vacuum drying equipment. The equipment is mainly used for drying the bodies of oil immersed transformers, transformers and capacitors, which can reduce the drying time by 40~50% compared with conventional vacuum drying. It is a process equipment with reliable performance, high efficiency and energy saving.

According to the requirements of the company and in combination with the design specifications of our company's variable pressure drying equipment, the following technical proposal is hereby formulated:

 

• Main purpose of the equipment

 

The equipment is used for the drying treatment of transformers or other electrical products with a voltage level of 110KV or below. Party B shall guarantee the process requirements and quality requirements for product treatment, and provide process treatment schemes and relevant control procedures for three voltage levels, namely 110KV, 33KV and 11KV.

 

• Main technical characteristics of the equipment

This set of equipment has the following technical features:

1. It has a reasonable vacuum system design, and enough condensate is discharged from the condenser to effectively avoid water pollution to the vacuum pump during drying.

2. The rotary vane vacuum pump adopts environment-friendly vacuum pump, and the smokeless treatment can be directly discharged indoors.

3. During the heating process, according to the different temperature of the body, the pressure in the vacuum tank is periodically reduced to a certain value by automatic pressure alternation, creating the most appropriate conditions for the evaporation of water in the insulation of the body, so that the water evaporation process in the drying process is in a reasonable state.

4. The equipment can effectively solve the rust problem of iron core in the drying process through the adjustment of variable pressure drying process.

5. The automation level of the equipment and the processing technology level of the products can reach the domestic advanced level, and the quality of the processed products can reach the level of the superior products in the industry.

6. This equipment can ensure the safety of production and use.

 

三,Main components of equipment

 

1. The main components of the whole set of equipment are as follows:

1.1 One vacuum drying tank;

1.2 A set of door opening mechanism and portal frame;

1.3 One set of vacuum system;

1.4 A set of low-temperature condensation system;

1.5 Two sets of heating system

1.6 A set of pneumatic pipeline system;

1.7 A set of cooling water system;

1.8 One set of hydraulic system;

1.9 A set of control and measurement system.

 

 

Variable pressure vacuum drying equipment
Front of drying equipment	Side of drying equipment

 

2,Site requirements (provided by Party A) and the cooperation Party A needs to provide:

Rated power: 35kW, 480V, 60Hz, three-phase, power supply connected to Party B's electric control cabinet

Cooling water: pressure ＞ 0.1MPa, circulating water tank ＞ 8m3.

Equipment floor area: 4500 × 6500mm, pit: 4500 × 4000× 450mm long × wide × High)

Compressed air: 0.4-0.6Mpa, consumption 0.2 m3/min

 

3,Composition, structural requirements and technical parameters of each system

3.1,Vacuum drying tank:

3.1.1 Effective internal dimension of drying tank 3000 × 3000 × 3000mm (long × wide × Height), horizontal type, effective height refers to the height from the load-bearing flat car in the tank to the inner wall of the tank top, the tank door is electrically moved to open the door, hydraulically locked, and the tank door is controlled by 3000 × 3000 mm face open.

3.1.2 The limit vacuum degree in cold state shall be ≤ 100Pa(1mbar), the time for pumping the vacuum tank to 100Pa in cold state shall be ≤ 60min, and the air leakage rate in no-load cold state shall be ≤ 200Pa · L/S (5mbar.L/S)(the measurement range is 50Pa to 720Pa).

3.1.3 The tank is heated by the heat transfer oil drain pipe on four sides.

3.1.4 Rock wool is used outside the tank for thermal insulation and color steel plate is used for armouring. The maximum temperature of the external surface shall not be 25 ℃ higher than the ambient temperature (according to the national standard).

3.1.5 The tank flange seal ring is a high temperature resistant and long-life special-shaped seal ring, with an effective service life of more than 2 years. The tank flange will not be deformed after long use.

3.1.6 Provision 2.8 × 2.8M, height ≤ 0.35M, load bearing 20T trolley. The trolley can bear large transformer (50T, three fulcrums) and high temperature in vacuum tank. Trolley is driven by electric traction head, which is convenient for entering and exiting the tank.

 

 

trolley

 

3.2,Door opening mechanism and portal frame

3.2.1,The tank door is electrically side moved to open the door, hydraulically locked, and each action is in place. The travel switch is interlocked for protection..

3.2.2,It is composed of tank door traverse gantry, drive reducer and transmission mechanism.

 

Electric side moving door opening mechanism

 

3.3, vacuum system

3.3.1,The vacuum system is configured as SV-300+SV-300(two Leybold pump vacuum pumps)/ZJP-600(five vacuum pumps in total), and the maximum pumping speed of the system is 600L/S. The vacuum system (including pumps and valves) operates automatically in sequence.

3.3.2,The main valve of vacuum system shall be high reliability and high fidelity pneumatic main valve, and the system shall also be equipped with pneumatic valve, electromagnetic vent valve, pressure sensor, vacuum pipeline and various accessories.

3.3.3,The gas extracted from the tank must be cooled and dewatered by the condenser.

3.3.4,System configuration and installation, convenient for operation and maintenance.

 

 

Vacuum drying vacuum unit

 

3.4,Low temperature condensation system

3.4.1 One horizontal condenser is used to condense the gas water extracted from the vacuum tank, and has the function of manual drainage without damaging the vacuum.

3.4.2 Stainless steel tubes with excellent heat transfer performance shall be used as condenser condenser tubes.

3.4.3 The system is equipped with a low temperature water chiller to provide 10 ℃ low temperature water to ensure a good condensing effect of the condenser.

 

3.5,One set of heating system

3.5.1 This set of equipment uses a mold temperature machine to heat the heat transfer oil with one set of heat transfer equipment. Heat transfer oil serves as a circulating heat transfer medium. Equipped with a 150000 calorie mold temperature machine that burns liquefied petroleum gas with a temperature control accuracy of ≤ ± 5 ℃.

 

3.5.2 This system is composed of a mold temperature machine (combustion engine), a high-temperature heat transfer oil pump (matched with the mold temperature machine), a filter, a high-temperature valve, a pressure gauge, a temperature sensor, pipelines, and accessories. All heating pipelines within the equipment range are armored with SUS430 stainless steel sheets, and insulated with rock wool pipes.

 

 

 

3.6,Pneumatic pipeline system

3.6.1 Provide air supply for pneumatic valves within the scope of equipment.

3.6.2 The system consists of 0.2m3 air compressor, air source triplet, pipeline, valve, etc.

3.6.3 Working pressure 0.4-0.6Mpa.

 

3.7,Cooling water system

3.7.1 The vacuum system is cooled by independent circulating cooling water, which is composed of air-cooled chiller, pressure gauge, filter, valve and pipeline.

3.7.2 The cooling water system is controlled separately. If the cooling water pressure is insufficient, the alarm will be given in the main control system.

 

3.8 Hydraulic system

3.8.1 It is used to lock the tank door.

3.8.2 The system consists of hydraulic station, 4 groups of hydraulic cylinders, pipelines, valves, etc.

 

3.9,Measurement and control system (touch screen)

3.9.1 Integrated electric control cabinet. Two modes of automatic control and manual operation are provided.

3.9.2 As the main control element, the programmable controller+touch screen can execute the variable pressure drying process and has the following functions:

Detection, display and storage of temperature and vacuum.

The touch screen controls and displays the process flow chart and the operation status of each equipment unit.

During the drying process, select the process parameters according to the specifications of the products to be treated, and change the process parameters as required.

Interlock and interlock between pumps and valves.

Realize alarm device for insufficient air pressure and water pressure.

Automatically execute the drying process.

Automatically judge the drying end point.

3.9.4 Mitsubishi programmable controller (Mitsubishi FX series PLC) can automatically complete the control of variable pressure drying process.

3.9.5 Digital vacuum gauge shall be used for vacuum measurement.

3.9.6 Two sets of Yuguang digital display temperature controllers are used for temperature control, and the temperature control accuracy is ± 3 ℃.

3.9.7 Solid state relay is adopted as the main control element of temperature.

3.9.8 Other control components shall be products of domestic and foreign high-quality brands.

 

3.10,Other technical requirements

3.10.1,The external surface of each system and pipeline is marked with different colors.

 

四,Itemized Quotation List of Equipment Configuration

 

No	Name	Model and details	unit	quantity	Unit USD
1	Vacuum drying tank	1. Effective size of vacuum tank 3000 × 3000 × 3000 mm (long × wide × High), horizontal. 2. Limit vacuum degree of vacuum tank (no-load, cold state) ≤ 50Pa, no-load leakage rate ≤ 200Pa · L/S. 3. Working temperature 115 ± 5 ℃, automatic temperature control 4. The tank flange seal ring is a high temperature resistant and long-life special-shaped seal ring. 5. Three temperature measuring probes. 6. Two illuminated observation windows. 7. Four sets of heat transfer oil heating pipes; 8.50t trolley and electric traction head	set	1
2	Door opening mechanism	Tank door traverse gantry, drive reducer, transmission mechanism	set	1
3	vacuum system	1. Two SV-300 rotary vane pumps Leybold pump vacuum 2. One ZJP-600 Roots pump 3. One high reliability high vacuum pneumatic main valve. 4. Various vacuum valves, shock connectors, vacuum measuring elements, vacuum pipelines, etc.	set	1
4	Condensation system	1. One horizontal condenser with new structure, 2. One water chiller.	set	1
5	heating system	1. The power of the mold temperature machine is 150000 kcal, and the heat transfer oil is used as the circulating heating medium. 2. It is composed of heating center, high-temperature pipeline pump, high-temperature valve and other accessories.	set	1
6	Pneumatic system	1Air source triplet and corresponding valves, gas pipes, etc.	set	1
7	cooling water system	1.20 M3/H pipeline pump, filter, pipeline, valve, pressure gauge, etc.	set	1
8	Hydraulic system	1. It is used to lock the tank door. 2. It is composed of hydraulic station, hydraulic cylinder, valve and other accessories.	set	1
9	Electric control system	1. Integrated electric control cabinet, programmable automatic control or manual control. 2. Touch screen control. 3. Mitsubishi FX series PLC 4. Various control modules. 5. Other electrical components. 6. Transformer method process software. 7. Digital temperature controller 2 sets 8. 5 sets of temperature sensors	set	1
10	Tank insulation	1. Rock wool, color steel plate	set	1
12	spare parts
13	Freight and packaging charges for accessories and large tank materials (Chinese ports)
Total amount fob USD

 

 

五,Equipment configuration list

no	name	model	quantity	producer
1	Vacuum pump	SV-300 ZJP-600	2 sets 1 set	VALUE HXNG
2	Sealing ring of tank door	3000*3000	1 piece	Our company
3	Electric trolley	30T	1 set	Our company
4	water chilling unit	4P	1 set	Our company
5	Electric heater	150000 kcal	1 set	Our company
6	Temperature measuring resistance	0～200℃	4	DILIGEN
7	Lighting observation lamp		3	ZHONGSHAN
8	Observation window glass	Tempering	3	Shanghai
9	condenser	6m2	1	Our company
10	Electric control system	Touch automatic control	1 set	Our company
11	Hydraulic system		1 set	Our company
12	Pressure sensor		1 piece	Shanghai
13	Vacuum gauge		1 set	瑞普
14	High temperature heat conduction pump	4KW	1 set	Shanghai
15	Thermometer	708	4 sets	厦门宇电
16	PLC	FX	1 set	Mitsubishi