CS259343B1 - Equipment for production of saturated steam - Google Patents

Abstract

The present invention relates to a device for producing saturated steam, in particular from waste heat from flue gases of tube furnaces, mainly for use in the petrochemical industry. The essence of the steam generating device is that it consists of a heat exchanger located in the smoke ducts, which is connected by one duct with a steam generator and a second duct with pump displacement. The pump outlet is interconnected by another conduit with a steam generator at the inlet of which is a throttle.

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for producing saturated steam, in particular from waste heat of conjugated gases of tube furnaces, which are mainly used in the petrochemical industry. The thermal efficiency of these furnaces can be increased by utilizing the waste heat of the flue gas leaving the convection section to produce saturated steam.

A device is known in which the flue gas heat is used in the convection part of a furnace to produce steam in a device similar to steam boilers. The essence of this device is a heat transfer surface, for example tubes, slats, located in the flue gas flow. Here the water evaporates into this area through the downpipes from the feed drum located above this evaporation surface. The steam produced passes through the steam pipe to the same drum. This device does not have this disadvantage.

The essence of the apparatus for producing saturated steam from the waste heat of the flue gases by means of a tube furnace according to the invention consists in that it consists of a heat exchanger device located in smoke traps which is connected by one pipe to the steam generator and the other to the pump outlet. The discharge of the pump is connected by a further piping to the steam generator, at the inlet of which there is a throttle.

The device according to the invention combines, inter alia, some of the advantages of commonly used drum and once-through boilers while at the same time eliminating some of their disadvantages. The advantages of the proposed device can be summarized as follows:

- good separation of clean, saturated steam from water droplets inside the steam generator,

- the excretion of salts from water does not occur on heat exchange surfaces, but in a readily extractable steam generator,

- the feed water may be of significantly lower quality than conventional systems, for evaporation on interchangeable surfaces and for subsequent salinisation,

- no need to use feed water preheaters,

- the steam generator is also used to supply the circuit and its contents ensure that the heat exchanger is supplied in the event of a short-term failure or fluctuation of the feed water inlet,

- the proposed system allows simple regulation of the supply water flow below the surface of the steam generator,

- the proposed system makes it possible to place a larger steam generator at any convenient place so as not to overload the structures and to avoid interfering with exposed areas,

- the connection between the steam generator and the light exchanger itself located in the smoke ducts is made through a small diameter pipe,

- the whole system is sufficiently flexible and dynamic.

The attached figure shows a circuit diagram of the device according to the invention.

Water is pumped from the steam generator 2 by suction line 2 under increased pressure of the pump 3 through a discharge line to a heat exchange device 2 'located in the smoke traps. In the heat exchange device 2, the water is heated by the waste heat of the flue gas to a temperature below the boiling point of the water. From the heat exchanger 2 heated water flows through line 2 back to the steam generator 2. At the inlet of the steam generator 2 there is a throttling member T in which the flow of heated water from the increased pressure to the desired saturated steam pressure in the generator is throttled. After the throttling element T, due to a sharp pressure drop, the water is partially evaporated and the steam thus produced is discharged from the upper space of the generator 2 through a pipe 6 for its own use.

The loss of evaporated water in the circuit is replenished via line 9, either into the spring dispenser 2 or into the suction line 2.

Claims (2)

object of the invention Apparatus for producing saturated steam, in particular from the waste heat of the flue gases of tube furnaces, characterized in that it consists of a heat exchange device (5), located in smoke traps and interconnected by a line (6) with a steam generator (1) and a line (4). ) with a discharge of the pump (3), which is connected by a line (2) to the steam generator (1), and a throttle (7) is located at the inlet of the steam generator (1). Device for producing saturated steam according to claim 1, characterized in that the steam generator (1) is located at a lower disposition level than the actual heat exchange device (5).