Explosive-Proof Mineral Insulated Electric Heater For Coal Tar Preheating

Explosive-proof Mineral Insulated Electric Heater for Coal Tar Preheating is designed based on magnesium oxide mineral insulated heating cable as heating element for the preheating coal tar which are widely used for the industrial kilns, transportation and industrial processes.

 

Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. Medicinally it is a topical medication applied to skin to treat psoriasis and seborrheic dermatitis (dandruff). It may be used in combination with ultraviolet light therapy.

 

Coal tar is a liquid for fuel for varies industrial furnaces for industries like metallurgy, building materials, glass, chemical industry etc or process feeds for many kinds of processes. This type of electric heater is mainly designed for preheating heavy oil, coal tar, residual oil, heavy diesel oil, fuel oil etc. It can effectively control heat transfer surface power load by which the fuel oil can get stable atomization temperature but also prevent heat exchange surface from coking. Based on this, heavy oil combustion conditions, thermal efficiency and energy-saving are all promoted. Industrial fuel-driven kiln automatic control is thus realized. The outlet temperature can be adjusted and controlled by the user, and constant temperature control overtemperature alarm are possible.

 

Second, technical properties

1. The heat transfer performance of the heating element of this product is good, and the temperature difference between the heating core and the metal sheath is 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 coke. It solves the shortcomings of the traditional tubular electric heaters for long-term carbon deposition, blasting, core breaking and short life. The heating element can with a copper or a stainless steel sheath according to the application temperature and location.

2. The outer shell of the electric heater is welded by seamless steel pipe and flange. The overall structure is tight and firm and the pressure sealing performance is good for safe use. The normal working pressure is 0.6MPa~6.4MPa.

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

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

5. No daily maintenance is required and it is easy to be installed and convenient to be maintained.

6. The product is practical and adaptable. Various non-standard types of electric heaters can be designed according to the different uses and special requirements put forward by users.

Note: When designing an electric heater for using outdoors, the explosion-proof junction box should have a rainproof shed to prevent rainwater from impregnating the gap of the explosion-proof surface through the wet insulation material.

 

Third, structure and working principle

1. Structure

The electric heater structure consists of nine parts. (See Figure 1)

1 Inlet pipe 2 Diversion Chamber 3 Heating Chamber 4 Temperature Measuring Resistor 5 Over Temperature Protector 6 Junction Box 7 Oil Outlet Pipe 8 Mixed Flow Chamber 9 Sewage Outlet

 

Figure 1: Schematic diagram of liquid electric mineral insulated heater

 

2. Working Principle

The cold medium enters the diversion chamber through the oil inlet, so that the medium flows into the mixing chamber along the periphery of the heating element, and the mixed medium flows out from the oil outlet at a uniform temperature. The mixing chamber is equipped with a temperature measuring sensor, and the temperature signal is collected and transmitted to the electronic control system. The temperature control instrument controls the primary circuit to realize automatic control of the oil temperature. When the oil products or electric heating element of the heater is overheated, the protection device automatically cuts off the power supply and the control cabinet emits an audible and visual alarm signal.

 

 

Fourth, technical specification

1. Model meaning

2. Technical data

The main technical data are shown in Table 1.

Table 1 Technical Data and Outer Dimension Sheet for Vertical Electric Heater

Model	Rated Power (Kw)	Rated Voltage (V)	Rated Current (A)	Power Phase	Outer Dimension(mm)			Body Weight (Kg)
					h1	H	D	6.3 MPa	4.0 MPa	2.5 MPa
YDRQ-3/220/L	3	220	13.5	1	180	720	φ219	165	105	90
YDRQ-5/220/L	5	220	22.5	1	180	860	φ219	175	120	105
YDRQ-7.5/220/L	7.5	220	34	1	180	1100	φ219	190	130	115
YDRQ-10/3/380/L	10	380	15	3	400	1000	φ273	240	200	165
YDRQ-15/3/380/L	15	380	22.5	3	400	1474	φ273	280	240	210
YDRQ-20/3/380/L	20	380	30	3	544	1100	φ377	475	320	260
YDRQ-30/3/380/L	30	380	45	3	544	1544	φ377	530	370	290
YDRQ-50/3/380/L	50	380	75	3	544	1850	φ377	640	510	430
YDRQ-80/3/380/L	80	380	120	3	600	2425	φ500	930	700	510
YDRQ-100/3/380/L	100	380	150	3	648	1850	φ600	1200	960	710
YDRQ-150/3/380/L	150	380	226	3	648	2920	φ600	1550	1050	820
YDRQ-200/3/380/L	200	380	300	3	648	3200	φ600	1790	1240	900
YDRQ-250/3/380/L	250	380	375	3	822	3482	φ1000	5000	3800	2900
YDRQ-300/3/380/L	300	380	450	3	822	3850	φ1000	6200	4950	3240
YDRQ-600/3/380/L	600	380	910	3	910	4854	φ1200	8000	6900	5800

 

 

 

 

 

 

 

 

 

 

Table 2 Technical Data and Outer Dimension Sheet for Horizontal Electric Heater

Model	Rated Power (Kw)	Rated Voltage (V)	Rated Current (A)	Power Phase	Outer Dimension(mm)				Body Weight (Kg)
					L	L1	L2	D	6.3 MPa	4.0 MPa	2.5 MPa
YDRQ-3/220/W	3	220	13.5	1	1100	750	450	φ159	85	55	45
YDRQ-5/220/W	5	220	22.5	1	1300	1000	750	φ159	100	60	50
YDRQ-7.5/220/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	22.5	3	1720	1400	1200	φ219	200	170	140
YDRQ-20/3/380/W	20	380	30	3	2000	1620	1300	φ219	220	180	150
YDRQ-30/3/380/W	30	380	45	3	2210	1850	1340	φ219	240	190	160
YDRQ-50/3/380/W	50	380	75	3	2750	2200	1600	φ273	400	315	240
YDRQ-80/3/380/W	80	380	120	3	3550	3100	2100	φ377	735	560	490
YDRQ-100/3/380/W	100	380	150	3	2950	2400	1750	φ530	1000	750	580
YDRQ-150/3/380/W	150	380	226	3	3500	3000	2300	φ530	1185	850	640
YDRQ-200/3/380/W	200	380	300	3	4350	3800	2650	φ530	1350	1000	720
YDRQ-250/3/380/W	250	380	375	3	4100	3600	2800	φ630	1900	1450	1050
YDRQ-300/3/380/W	300	380	450	3	4100	3600	2800	φ630	1950	1500	1100
YDRQ-600/3/380/W	600	380	910	3	4500	4000	3200	φ1000	5100	3800	2200