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Fluid liquid explosion-proof electric heater

Liquid explosion-proof electric heater (hereinafter referred to as electric heater) is a heating device specially designed to increase the temperature of the flowing medium in the pipeline. The mineral insulated (MI) heating cable is selected as the heating element. The structure is firm, durable, reliable, and has a long service life. It can ensure that the heated medium does not coke. It is suitable for the heating of various flowing media, especially suitable for heating the media with high viscosity, viscosity or high temperature quality requirements (such as crude oil, asphalt, residual oil, heavy diesel oil, animal and vegetable oils, etc.). It is widely used in petroleum, chemical, pharmaceutical, metallurgy, glass, power generation and other industrial sectors. Typical applications include offshore oil platforms, wellhead heating in oil fields, high-temperature atomization before combustion in oil-fired kilns, centralized air-conditioning hot water boilers, etc. .

Number of views:

1000

Category

Electric heaters

Quantity

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Description

Specification

parameter

output power

Application

Technical data

Table 1 Technical data and dimensions of vertical electric heaters

Model	Rated power Kw	Rated voltage (V)	Rated current (A)	Outline dimension (mm)						Body weight (Kg)
Model	Rated power Kw	Rated voltage (V)	Rated current (A)	H	h1	D	φ1	φ2	φ3	6.3 MPa	4.0 MPa	2.5 MPa
YDRQ-15/3/380/L	15	380	22.8	1974	400	273	400	360	4-Φ22	340	250	200
YDRQ-30/3/380/L	30	380	45.6	1884	544	377	560	480	4-Φ26	660	500	435
YDRQ-50/3/380/L	50	380	76	2350	544	377	560	480	4-Φ30	840	610	530
YDRQ-80/3/380/L	80	380	122	1480	600	500	720	620	4-Φ34	1480	1270	1030
YDRQ-100/3/380/L	100	380	152	1850	600	500	720	620	4-Φ34	1640	1360	1110
YDRQ-150/3/380/L	150	380	228	3220	648	600	850	750	4-Φ34	2130	1720	1460
YDRQ-200/3/380/L	200	380	304	3500	648	600	850	750	4-Φ36	2490	1940	1700
YDRQ-250/3/380/L	250	380	380	3782	822	1000	1300	1200	4-Φ40	7200	5430	4480
YDRQ-300/3/380/L	300	380	456	4818	822	1000	1300	1200	4-Φ42	7600	5950	4940
YDRQ-600/3/380/L	600	380	912	5154	910	1200	1600	1450	4-Φ44	12500	9880	8280

Note: The inlet and outlet diameter of the external process connection is the same. The conventional production specification of the pipe diameter is φ25～φ100, which is selected by the user, and the factory is responsible for configuring the pair of welding flanges.

Table 2 Technical data and dimensions of horizontal electric heaters

Model	Rated power Kw	Rated voltage (V)	Rated current (A)	Number of power phases	Outline dimension (mm)				Body weight (Kg)
Model	Rated power Kw	Rated voltage (V)	Rated current (A)	Number of power phases	L	L1	L2	D	6.3 MPa	4.0 MPa	2.5 MPa
YDRQ-3/1/220/W	3	220	13.5	1	1100	750	450	φ159	85	55	45
YDRQ-5/1/220/W	5	220	22.5	1	1300	1000	750	φ159	100	60	50
YDRQ-7.5/1/220/W	7.5	220	34	1	1650	1300	1000	φ159	110	65	52
YDRQ-10/3/380/W	10	380	15	3	1460	1050	750	φ219	180	160	130
YDRQ-15/3/380/W	15	380	22.8	3	1974	1400	1200	φ273	350	260	210
YDRQ-20/3/380/W	20	380	30	3	2200	1620	1300	φ273	380	292	243
YDRQ-30/3/380/W	30	380	45.6	3	2210	1850	1340	φ377	660	510	460
YDRQ-50/3/380/W	50	380	76	3	2750	2200	1600	φ377	840	615	540
YDRQ-80/3/380/W	80	380	122	3	1550	1210	750	φ530	1435	1260	1090
YDRQ-100/3/380/W	100	380	152	3	1950	1400	1200	φ530	1600	1360	1158
YDRQ-150/3/380/W	150	380	228	3	3520	3000	2300	φ630	2185	1850	1460
YDRQ-200/3/380/W	200	380	304	3	3750	3500	2450	φ630	2350	1900	1720
YDRQ-250/3/380/W	250	380	380	3	3780	3500	2450	φ1000	7200	5450	4450
YDRQ-300/3/380/W	300	380	456	3	4100	3600	2800	φ1000	1950	5900	4900
YDRQ-600/3/380/W	600	380	912	3	5100	4000	3200	φ1200	12500	9800	8200

Technical performance and characteristics

1. The heating element of this product is a (MI) heating cable, with good thermal conductivity, and the temperature difference between the heating core and the surface metal sheath is very small. At the same time, according to the process requirements, the surface heat load density of the heating element of the MI heating cable can be accurately designed. Under the premise of ensuring the total heating power, the heated medium will not be coked. It solves the long-standing shortcomings of carbon deposits, tube bursts, broken cores, and short life spans of traditional tubular electric heaters. Heating elements can be divided into copper, copper alloy sheaths and stainless steel sheaths according to the user's use temperature and location.

2. The shell of the electric heater is welded by seamless steel pipes and flanges. The overall structure is tight and strong, with good pressure-bearing and sealing performance, safe to use, and working pressure from 2.5MPa to 6.4MPa.

3. The device connection and electrical connection meet the explosion-proof requirements, and the explosion-proof grade is d IIBT1—T6.

4. Two sets of temperature sensors are installed in the electric heater to detect the temperature of the medium and the surface temperature of the heating element. At the same time, the flow opening and closing lock device can be selected according to the user's needs. When the medium does not flow, the electric heater will automatically stop heating.

5. No need for daily maintenance, easy installation and convenient maintenance.

6. The product has strong practicability and adaptability, and various non-standard types of electric heaters can be designed according to different uses and special requirements put forward by users.

Note: When designing and applying electric heaters outdoors, the explosion-proof junction box should have a rainproof shed to prevent rainwater from penetrating the cracks of the explosion-proof surface through the wet insulation material.

Working principle

The cold medium enters the shunt chamber through the oil inlet, so that the medium flows into the mixing chamber along the circumference of the heating element, and the mixed medium flows out of the oil outlet at a uniform temperature. The mixed flow chamber is equipped with a temperature measuring sensor, which collects temperature signals and transmits them to the electric control system. The primary circuit is controlled by the temperature adjustment instrument to realize automatic temperature control of the oil product temperature. After the electric heater is overheated by the oil or the electric heating element, the protection device will automatically cut off the power supply, and the control cabinet will send out an audible and visual alarm signal at the same time (see the company's WK series electric heating control cabinet instruction manual for details).

1. Installation

1.1 The heater support or base should be fixed on a stable and firm foundation. The horizontal electric heater is installed horizontally. The oil outlet is vertically upward, and a straight pipe section is required before the oil inlet and after the oil outlet, and a bypass pipeline is installed in the process design to meet the needs of electric heater maintenance and seasonal flexible operation. A space equal to the length of the heater should be reserved on the front side of the heater junction box for core-pulling overhaul.

1.2 Before installing the electric heater, use a 1000V shaking meter to check the insulation resistance between the main terminal and the shell, insulation resistance ≥1.5MΩ, marine electric heater insulation resistance ≥10MΩ; and check the body and various components Whether there are obvious defects.

1.3 The temperature control cabinet produced by our factory is generally non-explosion-proof equipment and should be installed outside the explosion-proof area (safe area). Carry out a comprehensive inspection during installation, and connect correctly according to the wiring diagram provided by the factory.

1.4 The selection of cables is carried out in accordance with relevant specifications. The cables must be copper core wires and connected with lugs. Electrical connections in explosion-proof places must meet explosion-proof requirements.

1.5 The electric heater is equipped with a dedicated grounding bolt, and the user reliably connects the grounding wire to the bolt. The grounding wire is a multi-strand copper wire of 4mm2 or more, and the grounding resistance is ≤10Ω.

1.6 After the wiring is completed, the joints of the explosion-proof junction box must be coated with industrial petroleum jelly to ensure that the seal is intact.

2. Trial run

2.1 Check the insulation of the system again before trial operation; check whether the power supply voltage is consistent with the nameplate; recheck whether the electrical connection is correct.

2.2 Set various process temperature constants according to the provisions of the temperature regulator instruction manual.

2.3 The over-temperature protector of the heater has been set according to the explosion-proof temperature, and only needs to be confirmed on site.

2.4 Before the electric heater replaces the air, first open the inlet and outlet pipeline valves, close the bypass valve, and replace it normally for a period of time. After ensuring that the medium is full, the electric heater can manually enter the normal trial operation. (The replacement of special medium needs to be discussed separately)

2.5 If the manual operation is normal, you can switch to the automatic operation state, operate correctly and record the voltage, current, temperature and other relevant data during operation. After the trial operation is 2 hours without abnormal conditions, the equipment can be handed over.

2.6 After the test run is successful, please keep the electric heater well insulated in time.

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Container explosion-proof electric heater