RU2094704C1 - Combustion chamber for steam-gas plant - Google Patents

Abstract

FIELD: heat power engineering. SUBSTANCE: combustion chamber has housing with outlet branch pipe for steam-gas mixture, concentrically arranged flame tube accommodating burner set with tangential air supply branch pipe and fuel nozzle connected to ring fuel heat exchanger, and ring multiple-stage water heat exchanger whose first peripheral stage is secured on housing wall and second inner stage is installed coaxially behind burner set, with clearance relative to flame tube and is provided with outlet atomizing device in form of one or several nozzles. Atomizing device is located in end face of inner chamber of water heat exchanger opposite to burner set on which guide lip is mounted. Guide lip is located in mixing chamber formed by ring stages of water heat exchanger. EFFECT: enlarged operating capabilities. 1 dwg

Description

 The invention relates to the field of power engineering and can be used mainly in combined cycle gas turbine engines.

 The prior art combustion chambers for combined cycle plants, which contain a housing with a pipe for supplying water or steam and an outlet pipe for steam-gas mixture and a burner with pipes for supplying fuel and air (ed. St. USSR N 601441, class F 01 K 22 / 02, 1978; ed. St. USSR N 1343043, class F 01 K 21/04, 1987).

 The main disadvantage of these combustion chambers is that the preheating of water and the production of steam in them comes from an external source of energy.

 The combustion chamber of steam and gas generators is also known, which contains a tubular body with an outlet pipe for a gas mixture, inside which there is a burner device with fuel and air supply pipes, and heat exchangers for heating water and producing steam with an adjustable steam spray device (ed. St. USSR N 168962, CL F 01 K 21/04, 1965).

 However, the design and relative position of the water heat exchangers inside the housing does not provide an economical use of the heat released in the burner during combustion of the fuel for preparing the gas-vapor mixture, since part of the heat is uselessly removed through the housing to the environment.

 Closest to the invention is a combustion chamber for a combined cycle plant, comprising a housing with an outlet pipe for a gas mixture, a heat pipe concentrically placed inside the housing with a burner device equipped with fuel and air supply pipes, and an annular multistage water heat exchanger, the first stage of which is fixed to the housing wall and the second inner stage is equipped with a spray device and forms a mixing chamber with the peripheral stage (Schnee. Ya. I. Gas turbines. M. Mashgiz, 1960, p. 8, 9).

 A multi-stage water heat exchanger, which provides cooling of the walls of the casing and heating the water with the heat released in the combustion chamber, increases the efficiency of the installation, however, the process of mixing water vapor with gaseous products of fuel combustion is not sufficiently organized.

 The invention is aimed at intensifying the process of generating a mixture of high parameters in the combustion chamber.

 The solution to this problem is provided by the fact that in a combustion chamber containing a housing with an outlet pipe for gas-vapor mixture, there are concentrically placed a heat pipe with a burner equipped with fuel and air supply pipes, and an annular multistage water heat exchanger, the first, peripheral stage of which is mounted on the housing, and the second, internal stage, is provided with a spray device at the outlet and forms a displacement chamber with a peripheral stage of the water heat exchanger, according to the invention, the locking device is additionally equipped with an annular heat exchanger for heating fuel installed inside the flame tube, which is made with a tangentially arranged air supply pipe, the inner stage of the water heat exchanger is installed coaxially behind the burner device and with a gap relative to the flame pipe, while the spray device is made in the opposite end of the burner device , which is equipped with a guide visor placed in the mixing chamber. The presence in the burner of an additional heat exchanger for heating the fuel and its relative position relative to the annular steps of the water heat exchanger, forming a mixing chamber in which the guide visor is placed, helps to improve the combustion of the fuel and provides intensive mixing of gaseous products of combustion with water vapor, homogenization of the vapor-gas mixture flow with obtaining highly dispersed homogeneous working fluid of high parameters suitable for efficient use in propulsion.

 The drawing shows a General view of the combustion chamber.

 The combustion chamber contains a cylindrical body with an outlet pipe 2 for the vapor-gas mixture, a concentric annular multistage water heat exchanger, the first along the water, the peripheral stage 3 of which is fixed to the wall of the housing 1, and the second, located in the hotter zone, the inner stage 4, is equipped with the output by a spray device made in the form of one or more nozzles 5 and a guiding visor 6, and a heat pipe 7 installed with a gap relative to the inner stage 4 of the water heat exchanger . A burner device is located in the flame tube 7, including a tangential pipe 8 for supplying air and a fuel nozzle 9 connected to an annular fuel heat exchanger 10, which is mounted coaxially in front of the second inner stage 4 of the water heat exchanger and is equipped with a pipe 11 for supplying fuel.

 The combustion chamber operates as follows.

 When burning fuel, which is supplied to the nozzle 9 heated in the fuel heat exchanger 10, gaseous products of combustion are formed, which from the inner space of the annular fuel heat exchanger 10 and the flame tube 7 pass through the central channel through the inner stage 4 of the annular water heat exchanger, unfold, flowing around installed at the end the last guide visor 6, and enters the mixing chamber 12, formed by the annular concentric steps 3 and 4 of the water heat exchanger and the flame tube 7.

 Water first enters the first peripheral stage 3 of the water heat exchanger, which provides cooling of the housing 1 and preheating, and then goes to the second stage 4 of the water heat exchanger and is introduced into the mixing chamber 12 through the nozzles 5 of the spray device.

 The vapor-gas mixture obtained in the mixing chamber 12 with high parameters is discharged through the outlet 2. In this case, part of the gas-vapor mixture flow is sucked through the gap between the flame tube 7 and the second internal stage 4 of the water heat exchanger into the central stream of gaseous products of combustion leaving the heat pipe 7, and mixes with it, which helps to increase the uniformity and uniformity of the distribution of parameters of the gas mixture.

Claims (1)

 A combustion chamber for a combined-cycle plant, comprising a housing with an outlet pipe for a gas-vapor mixture, a concentrically placed heat pipe with a burner equipped with fuel and air supply pipes, and an annular multistage water heat exchanger, the first, peripheral, the stage of which is fixed to the housing wall, and the second, the inner stage is equipped with a spray device at the outlet and forms a mixing chamber with the peripheral stage of the water heat exchanger, characterized in that the burner device It is additionally equipped with an annular heat exchanger for heating fuel installed inside the flame tube, which is made with a tangentially located air supply pipe, the inner stage of the water heat exchanger is installed coaxially behind the burner device and with a gap relative to the flame pipe, while the spray device is made in the opposite end of the burner device, which equipped with a guide visor located in the mixing chamber.