RU2734669C1 - Process gas heating unit - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: invention relates to the field of power engineering. Process gas heating unit consists of heat exchanger for process gas heating with use of intermediate liquid heat carrier and two and more heat generators of pulsating combustion for heating of liquid heat carrier arranged in common reservoir of liquid heat carrier. Valve-mixing devices of heat generators are placed in adjoining to common reservoir of liquid heat carrier housing with single pipe for air supply to valve-mixing devices, and for emission of flue gases from combustion chamber of each heat generator through tubes-resonators and additional resonance circuit is a chimney with noise silencer, which is output part of additional resonance circuit, wherein inlet part of additional resonant circuit is arranged in common reservoir of liquid heat carrier.

EFFECT: invention allows increasing power of gas heating unit with reduced labor costs for manufacturing and providing explosion and fire protection.

1 cl, 2 dwg

Description

The invention relates to the field of heating liquids and gaseous media and concerns, first of all, devices for heating process gas in gas distribution stations.

A device for heating process gas in a gas distribution station (GDS) is known, containing a heat exchanger with pipelines for supplying and removing process gas, and a heat generator with a pulsating combustion chamber equipped with a valve-mixing device, an additional resonating device providing the required range of stable combustion modes with the elimination or reduction of start-stop modes, (RF patent for invention No. 2655426, IPC F23C 15/00, F23C 9/00, 28.05.2018). The device has a high passive explosion protection due to the small volume of the combustion chamber, in addition, the design of the valve-mixing device due to the absence of "open fire", and with it the heat generator as a whole, have complete explosion and fire safety.

Nevertheless, the disadvantage of the known device should be attributed to a significant increase in labor intensity and metal consumption, and, consequently, in the cost of the process gas heating unit as a whole, if it is necessary to increase the power of the device due to the separation of the heat exchanger structure with pipes for supplying and removing the coolant and the heat generator.

Known device for heating gas and oil, containing a housing filled with a liquid intermediate heat carrier, which houses a heat exchanger and a horizontally oriented heat generator, which includes a burner, a flame tube, a bundle of smoke tubes, and the device has at least a second horizontally oriented generator with the ability to connect each heat generator both autonomously and simultaneously all together. The conclusion of the heat exchanger and the heat generator in a single common coolant capacity simplifies the process gas heating block scheme, first of all, due to the removal from the circuit of hydraulic pumps with pipes for supplying and removing the coolant from the heat generator to the heat exchanger (RF patent for utility model No. 53410, IPC F22B 7/00 , 01.10.2006).

The disadvantage of this device, taken as a prototype, is the lack of explosion and fire protection of the process gas heating unit with a heat generator with gas burners ("open flame"). So, when gas from the environment enters the area where gas burners are located, for example, when a gas pipeline breaks, an explosion of a mixture of air and gas is most likely possible.

The technical result to which the present invention is directed is to provide the possibility of increasing the power of the heat generator while ensuring its explosion and fire safety while minimizing the metal consumption and labor intensity.

The technical result is achieved by the fact that in the process gas heating unit, consisting of a heat exchanger for heating the process gas and several heat generators for heating the liquid heat carrier, placed in the common tank of the heat carrier liquid, the new thing is that two or more pulsating heat generators are placed in the common container of the heat carrier fluid. combustion, the valve-mixing devices of which are placed in a housing adjacent to the common tank of the liquid heat carrier with a single pipe for supplying air to the valve-mixing devices, and a chimney with a silencer is used to eject flue gases from the combustion chamber of each heat generator through resonator pipes and an additional resonating device , which is the output part of the additional resonating device, and the input part of the additional resonating device is placed in the common tank of the heat carrier fluid,

it is also new that the heat generators and the “U” -shaped bundle of heat exchanger tubes are separated by a longitudinal partition.

FIG. 1 shows a longitudinal section of the process gas heating unit, FIG. 2 - cross section.

The gas heating unit contains a heat exchanger 1 for heating the process gas and two heat generators 2 for heating the liquid heat carrier, placed in a common tank 3 of the liquid heat carrier. Heat generators 2 are made according to the pulsating combustion scheme. In this case, the valve-mixing device 4 of each heat generator 2 is placed in the housing 5, adjacent to the common tank 3 of the liquid heat carrier. The cavity 6 of the housing 5 is in communication with the pipe for supplying air 7 from the atmosphere to suck it into the combustion chamber 8 through the check valve 9 of the valve-mixing device 4 of each heat generator 2. The check valve 10 serves to supply fuel gas to the valve-mixing device 4. 11 combustion chambers 8 are in communication with an additional resonating device 12, the outlet part 13 of which is a chimney with a silencer 14. The inlet part 15 of the additional resonating device 12 is placed in a common tank 3 of a liquid heat carrier for additional heat removal from flue gases.

To optimize convection of liquid heat carrier flows, heat generators 2 and "U" -shaped bundle 16 of heat exchanger tubes 1 are separated by a longitudinal partition 17.

The small size of the combustion chamber increases its passive explosion protection, and the closed design of the valve-mixing device (no "open fire") provides complete explosion and fire protection.

The process gas heating unit works as follows. Fuel gas through the check valve 10 and air through the check valve 9 enter the valve-mixing device 4, where a fuel-air mixture is formed, which is burned in the combustion chamber 8. Air to the valve-mixing device 4 of each of the two heat generators 2 is taken from the common cavity 6, where it enters through a single pipe for supplying air 7 from the atmosphere. The use of this pipe ensures that natural gas does not enter the cavity 6 from the atmosphere in the event of any accident on the gas pipeline (the density of the mixture of natural gas and air at the entrance to the pipe 7 is less than the density of air in the cavity 6). Combustion products through pipes-resonators 11 and an additional resonating device 12 and then the outlet part 13 of this device are emitted into the atmosphere through a chimney with a silencer 14. Heating of the coolant occurs through the walls of the combustion chamber 8, pipes-resonators 11 and the outlet part 15 of the additional resonating device 12.

For additional heat removal from the elements of heat generators 2 is a longitudinal partition 17 (Fig. 2) between them, which optimizes the convection of fluid flows in order to increase heat removal "and" -shaped bundles of tubes 16 of the heat exchanger 1, through which the process gas passes.

The placement of heat generators 2 in a common tank of a liquid heat carrier 13 with a heat exchanger 2 makes it possible to solve the issue of increasing the power of the gas heating unit at a lower cost by reducing the metal consumption and labor intensity of manufacturing. The use of a pulsating combustion heat generator 2 in a gas heating unit provides explosion and fire protection not only by introducing an air intake pipe 7, but mainly due to the absence of an open flame in the valve mixing device 4 and heat generator 2 as a whole. The principle of operation of the pulsating combustion heat generator provides high completeness of combustion of the gas-air mixture. At the same time, the placement of a part of the pipe 15 of the additional resonating device 4 in the common tank 3 of the liquid heat carrier ensures a high efficiency of the gas heating unit (~ 95%).

Claims (2)

1. A process gas heating unit, consisting of a heat exchanger for heating a process gas using an intermediate liquid heat carrier and several heat generators for heating a liquid heat carrier, placed in a common tank of a liquid heat carrier, characterized in that two or more heat generators of pulsating combustion are placed in a common tank of a liquid heat carrier , the valve-mixing devices of which are placed in a housing adjacent to the common tank of the liquid heat carrier with a single pipe for supplying air to the valve-mixing devices, and a chimney with a silencer serves to eject flue gases from the combustion chamber of each heat generator through resonator pipes and an additional resonance circuit, which is the output part of the additional resonance circuit, and the input part of the additional resonance circuit is located in the common tank of the coolant. 2. The process gas heating unit according to claim 1, characterized in that the heat generators and the "U" -shaped bundle of heat exchanger tubes are separated by a longitudinal partition.

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