CN102898390A - Method for heating triamine reactor carrier gas with flue gas of molten salt furnace - Google Patents

Abstract

The invention relates to the field of production of tripolycyanamide, in particular to a method for heating a reactor by using high-temperature flue gas generated by a molten salt furnace during production of tripolycyanamide. The method comprises the following steps of: arranging a shell and tube heat exchanger between the molten salt furnace and a dust remover; making normal-pressure flue gas discharged out of the molten salt furnace enter the shell side of the shell and tube heat exchanger; making ammonia gas of 0.1MP enter the shell side of the shell and tube heat exchanger at the normal temperature; heating to 320-350 DEG C by using high-temperature flue gas in the shell side; entering a carrier gas preheater; heating to 390-420 DEG C by using molten high-temperature molten salt; and entering the bottom of the reactor to obtain reaction carrier gas. Carrier gas is heated by using high-temperature flue gas generated by the molten salt furnace, so that waste of high-temperature flue gas is reduced, the using amount of molten salt is reduced simultaneously, coal consumption is lowered, the consumption of white coal is 3.9-4.0 tons needed for preparing every ton of tripolycyanamide in a refitted reaction system through practical production, and cost is saved greatly.

Description

Utilize the method for molten salt furnace flue gas heating triamine device carrier gas

Technical field

The present invention relates to the Melamine Production field, relate to specifically the method for the high-temperature flue gas reactor heating that utilizes the molten salt furnace generation in the Melamine Production.

Background technology

In the Melamine Production, the temperature of reaction of urea is about 390 ℃ in the reactor, in the general industrial production, directly utilize molten salt furnace heating fused salt, carrier gas in the high-temperature molten salt reactor heating that melts, the consumption of coal is high, and one ton of trimeric cyanamide of general every production on average needs to consume 4.2 tons anthracite.And the flue-gas temperature that molten salt furnace produces is up to more than 500 ℃, and in the existing production equipment, the molten salt furnace flue gas generally passes through preheated air behind the fly-ash separator, and high level heat has caused the waste of the energy as Lowlevel thermal energy usefulness.

Summary of the invention

The objective of the invention is to utilize the high-temperature flue gas of molten salt furnace generation, the reactor heating carrier gas improves temperature of reactor.

The present invention realizes by the following technical solutions:

Utilize the method for molten salt furnace flue gas heating triamine device carrier gas, technical process is:

Between molten salt furnace and fly-ash separator, increase a tube and shell heat exchanger, molten salt furnace normal pressure flue gas out enters the shell side of tube and shell heat exchanger, normal temperature, 0.1MP ammonia be introduced in the tube side of tube and shell heat exchanger, utilize the high-temperature flue gas in the shell side to be heated to 320-350 ℃, then enter carrier gas preheater, utilize the high-temperature molten salt that melts to be heated to 390-420 ℃, enter at last reactor bottom, as the reaction carrier gas.

The invention has the beneficial effects as follows: the high-temperature flue gas heating carrier gas that utilizes molten salt furnace to produce, reduced the waste of high-temperature flue gas, reduced simultaneously the consumption of fused salt, saved coal, through actual production, one ton of trimeric cyanamide of the every production of improved reactive system need to consume anthracite 3.9-4.0 ton, has greatly saved cost.

Description of drawings

Fig. 1 is original production technique;

Fig. 2 is improved production technique.

Embodiment

As shown in Figure 1, in original production technique, the high-temperature flue gas that molten salt furnace produces directly enters air preheater through fly-ash separator, high level heat has been wasted resource as Lowlevel thermal energy usefulness, and carrier gas utilizes the fused salt heating of thawing fully, the fused salt expense is large, and coal consumption is high.Technique after the improvement as shown in Figure 2, between molten salt furnace and fly-ash separator, increase a tube and shell heat exchanger, molten salt furnace normal pressure flue gas out enters the shell side of tube and shell heat exchanger, normal temperature, the ammonia of 0.1MP is introduced in the tube side of tube and shell heat exchanger, utilizes the high-temperature flue gas in the shell side to be heated to 320-350 ℃, then enter carrier gas preheater, utilize the high-temperature molten salt that melts to be heated to 390-420 ℃, enter at last reactor bottom, as the reaction carrier gas.

Claims (1)

1. utilize the method for molten salt furnace flue gas heating triamine device carrier gas, it is characterized in that its technical process is:

Between molten salt furnace and fly-ash separator, increase a tube and shell heat exchanger, molten salt furnace normal pressure flue gas out enters the shell side of tube and shell heat exchanger, normal temperature, 0.1MP ammonia be introduced in the tube side of tube and shell heat exchanger, utilize the high-temperature flue gas in the shell side to be heated to 320-350 ℃, then enter carrier gas preheater, utilize the high-temperature molten salt that melts to be heated to 390-420 ℃, enter at last reactor bottom, as the reaction carrier gas.

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