CN111139489A

CN111139489A - Electric heating system suitable for pickling bath acidizing fluid heating

Info

Publication number: CN111139489A
Application number: CN202010048702.2A
Authority: CN
Inventors: 张欣翼; 刘安平; 李伟; 纪楠
Original assignee: Sichuan Jinlvnong Environmental Technology Co Ltd
Current assignee: Sichuan Jinlvnong Environmental Technology Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-12

Abstract

The invention discloses an electric heating system suitable for heating acid liquor in a pickling tank, which comprises the pickling tank, an electromagnetic heating body and an electronic control box, wherein the electromagnetic heating body is arranged on the pickling tank; the pickling tank is respectively connected with a liquid inlet and a liquid outlet of the electromagnetic heating body through a liquid inlet pipe and a liquid outlet pipe to form a pickling solution circulating heating loop, and a circulating pump and an electromagnetic valve are installed on the heating loop; the electronic control box is electrically connected with the electromagnetic heating body, the circulating pump and the electromagnetic valve; the electromagnetic heating body comprises an electromagnetic shielding shell and an electromagnetic heating coil arranged in the electromagnetic shielding shell, the electromagnetic heating coil is wound on a sealing shell made of polytetrafluoroethylene, and a graphite heating layer is arranged on the inner wall of the sealing shell; the electromagnetic heating coil is connected with the electronic control box. The electromagnetic heating body is used for replacing the traditional steam heating mode of a natural gas steam boiler, so that the energy consumption is saved, the safety is improved, and the cost is saved.

Description

Electric heating system suitable for pickling bath acidizing fluid heating

Technical Field

The invention belongs to the field of pickling solution heating, and particularly relates to an electric heating system suitable for heating pickling solution in a pickling tank.

Background

The method for removing the oxide skin and the rusty material on the surface of the steel by using the acid solution in the steel making process is pickling, wherein the acid solution is a solution with strong corrosivity and is composed of hydrochloric acid, hydrofluoric acid and an additive, and the pickling solution is generally required to be heated in the pickling process, so that the pickling effect is improved. Currently, the heating of the pickling solution is performed by steam generated by a natural gas steam boiler. Because the heat transfer system using steam as a heating medium is low, and the steam is easy to run, overflow, drip, leak and the like during transmission and collection to cause heat loss; and the steam boiler also belongs to a pressure vessel, so potential safety hazards are easily caused, and meanwhile, the maintenance cost is high. Further, since the pickling solution is highly corrosive, the conventional electric heater (resistance heating) for heating the liquid is not suitable.

Disclosure of Invention

The invention aims to provide an electric heating system which can replace the traditional steam heating and is suitable for heating acid liquor in a pickling tank.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

an electric heating system suitable for heating acid liquor in a pickling tank comprises the pickling tank, an electromagnetic heating body and an electronic control box; the pickling tank is respectively connected with a liquid inlet and a liquid outlet of the electromagnetic heating body through a liquid inlet pipe and a liquid outlet pipe to form a pickling solution circulating heating loop, and a circulating pump and an electromagnetic valve are installed on the heating loop; the electronic control box is electrically connected with the electromagnetic heating body, the circulating pump and the electromagnetic valve;

the electromagnetic heating body comprises an electromagnetic shielding shell and an electromagnetic heating coil arranged in the electromagnetic shielding shell, the electromagnetic heating coil is wound on a sealing shell made of polytetrafluoroethylene, and a graphite heating layer is arranged on the inner wall of the sealing shell; the two ends of the sealing shell are hermetically connected with a liquid inlet pipe and a liquid outlet pipe; the electromagnetic heating coil is connected with the electronic control box.

Further, a temperature controller is arranged in the pickling tank.

Further, the temperature controller is connected with the electronic control box.

Further, the graphite heating layer adopts polycrystalline graphite.

Furthermore, the electromagnetic heating body comprises a plurality of liquid outlets and liquid outlets, the liquid outlets of the electromagnetic heating bodies are connected with the liquid outlet pipe, the liquid inlets are connected with the liquid inlet pipe, and the liquid outlet pipe or the liquid inlet pipe connected with each electromagnetic heating body is provided with an independently controlled electromagnetic valve.

The invention has the following beneficial effects:

(1) the electromagnetic heating body replaces the traditional steam heating mode generated by a natural gas steam boiler, so that the energy consumption is saved, the safety is improved, and the cost is saved;

(2) the sealing shell of the electromagnetic heating body is made of polytetrafluoroethylene materials, has extremely low friction coefficient, good wear resistance and excellent chemical stability, and is resistant to corrosion of hydrofluoric acid; the heating layer is made of polycrystalline graphite, and the graphite has the advantages of good electrical conductivity, corrosion resistance, low thermal expansion system and the like and is more suitable for heating the pickling solution;

(3) the temperature of the pickling solution is controlled by independently controlling each electromagnetic heating body by arranging the plurality of electromagnetic heating bodies;

(4) the electronic control box can intelligently control the opening number of the electromagnetic heating bodies according to the acquired temperature by arranging the temperature control meter in the pickling solution, so that the temperature of the pickling solution is intelligently controlled;

(5) the heating effect is good, the energy consumption is low, the cost is low, the safety is good, and the maintenance and the repair are convenient.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the electromagnetic heater of the present invention.

Fig. 3 is a schematic view of the connection relationship of a plurality of electromagnetic heaters according to the present invention.

FIG. 4 is a schematic diagram of the electrical connection relationship of the present invention.

The labels in the figure are: 10. a pickling tank; 11. a liquid inlet pipe; 12. a liquid outlet pipe; 20. an electromagnetic heating body; 21. an electromagnetic shielding case; 22. an electromagnetic heating coil; 23. sealing the housing; 24. a graphite heating layer; 30. an electronic control box; 40. a circulation pump; 50. an electromagnetic valve; 60. a temperature controller.

Detailed Description

As shown in fig. 1, the electric heating system for heating acid solution in the pickling tank 10 according to the present embodiment includes the pickling tank 10, an electromagnetic heating body 20, and an electronic control box 30; the pickling tank 10 is a pickling tank 10 in the existing plant, and two ends of the pickling tank 10 are respectively communicated with a liquid inlet pipe 11 and a liquid outlet pipe 12.

The pickling tank 10 is respectively connected with a liquid inlet and a liquid outlet of the electromagnetic heating body 20 through a liquid inlet pipe 11 and a liquid outlet pipe 12 to form a pickling liquid circulating heating loop, and a circulating pump 40 and an electromagnetic valve 50 are installed on the heating loop; the circulating pump 40 is a conventional corrosion-resistant pump with ECU control, and the electromagnetic valve 50 is a valve body which can be opened or closed by an electric signal according to the prior art.

The electronic control box 30 is used for being connected with the electromagnetic heating body 20, the circulating pump 40 and the electromagnetic valve 50, realizes that the control electromagnetic valve 50 heater, the circulating pump 40 and the electromagnetic valve 50 are opened or closed, and then realizes the heating of the pickling solution in the pickling tank 10, and the electronic control box 30 adopts the 21 power cabinets of standard, disposes knife switch, quick-melt protection, earth leakage protection in it and opens etc. mainly need dispose control module, control module adopts PLC to constitute for be connected with the electromagnetic heating body 20, the circulating pump 40 and the electromagnetic valve 50.

As shown in fig. 2, the electromagnetic heating body 20 includes an electromagnetic shielding case 21, an electromagnetic heating coil 22, a sealing shell 23 and a graphite heating layer 24, wherein the graphite heating layer 24 is made of polycrystalline graphite, which is an inorganic non-metallic material and has good thermal/electrical conductivity, low thermal expansion coefficient and good corrosion resistance, and thus is not corroded by the heated pickling solution; the graphite heating layer 24 is arranged on the inner wall of the sealing shell 23, a plurality of circles of electromagnetic heating coils 22 are wound on the outer wall of the sealing shell 23, two ends of each electromagnetic heating coil 22 are connected with a power supply, magnetic induction lines are generated through the electromagnetic heating coils 22 and are cut by the graphite heating layer 24 to generate heat, and then heating of the pickling solution is achieved, and the sealing shell 23 is formed by extrusion of polytetrafluoroethylene due to the fact that the pickling solution has strong corrosivity, and the sealing shell 23 can be used at the highest temperature of 290-; it is important to resist corrosion by hydrofluoric acid. An electromagnetic shielding shell 21 is further arranged on the outer side of the electromagnetic heating body 20, so that the heat loss can be reduced.

In actual production, the heat load required by the pickling tank 10 is 6888000kj, the lowest required electric energy is 1913KW, the pickling tank is heated for 6 hours every day, the electric energy is 318KW every hour, and because the pickling tank 10 and a pipeline have heat dissipation loss in the heating process, the loss amount is related to the material and the environmental temperature of the pickling tank 10; thus, the heat dissipation loss is proportional to the ambient temperature difference and the area of the pickling tank 10, and inversely proportional to the thickness of the pickling tank 10. Under the condition of no heat preservation, the influence of the ambient temperature on heat dissipation is large, the heat dissipation loss of a PP material (the material of the pickling tank 10) with the thickness of 10cm is 1200W-2400W per square meter, and the convection heat dissipation of the open-type pickling tank 10, the heat absorption of steel materials and the like are considered in consideration of the electric energy conversion power factor of 0.95. The acid bath total power supply needs 500 KW's electric energy, and the transformer provides 380V's three-phase power frequency alternating current in the factory building, electromagnetic heating body 20 designs according to 50KW, consequently need set up 12 electromagnetic heating body 20 to the pickling solution heating in the descaling bath 10.

As shown in fig. 3, the maximum actual flow rate of the circulation pump 40 heated by the pickling tank 10 is 20 tons, the maximum circulated heat supply amount per hour is 5880000KJ, the electromagnetic heaters 20 generate 121000KJ of heat energy per hour, 12 electromagnetic heaters 20 generate 1452000KJ of heat energy per hour, 8712000KJ of heat energy can be generated in 6 hours, and the heat load required by the pickling tank 10 is 6888000 KJ.

According to the needs of heat load, adjustable electromagnetic heating body 20's quantity, it is a plurality of electromagnetic heating body 20 all is connected with the host system in the electronic control box 30, host system can carry out the independent control to every electromagnetic heating body 20 through sending control signal, and then realize control pickling solution heating temperature, solenoid valve 50 is all installed at every electromagnetic heating body 20's both ends, whether can realize the pickling solution through the electromagnetic heating body 20 heating that solenoid valve 50 is connected through control solenoid valve 50, feed liquor pipe 11 and drain pipe 12 of being connected with descaling bath 10 are all connected at a plurality of electromagnetic heating body 20 both ends, circulating pump 40 installs on feed liquor pipe 11 and is close to descaling bath 10.

For realizing intelligent control, install the temperature controller 60 that is used for detecting the temperature of pickling solution in the descaling bath 10, as shown in fig. 4, temperature controller 60 is connected with the host system in the electronic control case 30, and host system passes through the temperature that temperature controller 60 gathered and the temperature intelligent control of the pickling solution of facility in advance electromagnetic heating body 20's quantity, realizes the intelligent control to the pickling solution.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.

Claims

1. The utility model provides an electric heating system suitable for descaling bath acidizing fluid heating which characterized in that: comprises a pickling tank (10), an electromagnetic heating body (20) and an electronic control box (30); the pickling tank (10) is respectively connected with a liquid inlet and a liquid outlet of the electromagnetic heating body (20) through a liquid inlet pipe (11) and a liquid outlet pipe (12) to form a pickling liquid circulating heating loop, and a circulating pump (40) and an electromagnetic valve (50) are installed on the heating loop; the electronic control box (30) is electrically connected with the electromagnetic heating body (20), the circulating pump (40) and the electromagnetic valve (50);

the electromagnetic heating body (20) comprises an electromagnetic shielding shell (21) and an electromagnetic heating coil (22) arranged in the electromagnetic shielding shell (21), wherein the electromagnetic heating coil (22) is wound on a sealing shell (23) made of polytetrafluoroethylene, and a graphite heating layer (24) is arranged on the inner wall of the sealing shell (23); two ends of the sealed shell (23) are hermetically connected with a liquid inlet pipe (11) and a liquid outlet pipe (12); the electromagnetic heating coil (22) is connected with an electronic control box (30).

2. The electrical heating system suitable for acid bath heating of pickling tanks of claim 1, wherein: a temperature controller (60) is arranged in the pickling tank (10).

3. The electrical heating system suitable for acid bath heating of pickling tanks of claim 2, wherein: the temperature controller (60) is connected with the electronic control box (30).

4. The electrical heating system suitable for acid bath heating of pickling tanks of claim 1, wherein: the graphite heating layer (24) is made of polycrystalline graphite.

5. The electrical heating system suitable for acid bath heating of pickling tanks of claim 1, wherein: the electromagnetic heating body (20) comprises a plurality of liquid outlets, the liquid outlet of each electromagnetic heating body (20) is connected with the liquid outlet pipe (12), the liquid inlet of each electromagnetic heating body is connected with the liquid inlet pipe (11), and the liquid outlet pipe (12) or the liquid inlet pipe (11) connected with each electromagnetic heating body (20) are respectively provided with the independently controlled electromagnetic valve (50).