CN204460713U - Efficient heating furnace - Google Patents

Abstract

The utility model relates to the efficient heating stove to all kinds of dielectric heatings such as crude oil, water, natural gases in a kind of petroleum industry.This heating furnace is configured with the two-stage heat exchanger of vertical assembling, tube side serial communication; The import of first-class heat exchanger tube side connects the high-temperature flue gas outlet of smoke box, and first-class heat exchanger shell side arranges the import and export of heated medium, the high-temperature flue gas heat exchange in heated medium and tube side, then enters the working fluid heat exchanger of heating furnace; Secondary heat exchanger shell side is provided with combustion air import and export, and the exhanst gas outlet of secondary heat exchanger bottom is connected with chimney, and the flue gas after first-class heat exchanger heat exchange enters the tube side of secondary heat exchanger, with the combustion air heat exchange entering shell side; The combustion air outlet of secondary heat exchanger connects the burner of heating furnace by combustion-supporting hot-air duct, be provided with condensation-water drain bottom secondary heat exchanger.Heat in flue gas, through two-stage flue gas heat exchange, makes full use of, significantly improves thermal efficiency of heating furnace by the utility model.

Description

Efficient heating furnace

technical field

The utility model relates to a heating furnace for heating various media such as crude oil, water and natural gas in the petroleum industry, in particular to a high-efficiency heating furnace.

Background technique

At present, in the field of oil and gas gathering and transportation in the petroleum industry, heating furnaces are generally used to heat various media such as crude oil, water, and natural gas to meet the needs of oil and gas gathering and transportation. Most heating furnaces are fueled by natural gas and run all year round, and are the main energy-consuming equipment in oil field production. The design thermal efficiency of the existing heating furnace is generally between 85-90%, and the average operating thermal efficiency is about 85%. The thermal efficiency of the heating furnace mainly depends on the heat loss of the exhaust gas. The higher the exhaust gas temperature, the greater the heat loss and the lower the thermal efficiency. The exhaust gas temperature of the existing heating furnace is generally above 150°C, which contains more heat, and The large amount of water vapor produced by combustion also contains a large amount of latent heat of phase change. Therefore, the operating thermal efficiency of the existing heating furnace still has a large room for improvement.

Utility model content

The utility model aims to solve the problem of improving the thermal efficiency of the above-mentioned heating furnace operation, and provides a high-efficiency heating furnace.

The technical solution adopted by the utility model to solve the problem is:

A high-efficiency heating furnace, including a pot shell, a working medium heat exchanger, a burner, a furnace liner, a smoke pipe, a smoke box, a chimney, a flue, an air duct, a fan, and the furnace liner and the smoke pipe are arranged in the pot shell and immersed In the heat transfer medium water, a vacuum valve is installed on the top of the pot shell; it also includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger and the secondary heat exchanger are both shell and tube heat exchangers. The heat exchanger is located on the top of the secondary heat exchanger and is a vertical assembly structure. The tubes of the two-stage heat exchangers are connected in series; The tube-side inlet of the heat exchanger is connected to the high-temperature flue gas outlet of the smoke box through the flue. The working medium heat exchanger entering the heating furnace; the secondary heat exchanger is a heat exchanger between the flue gas and the combustion air of the heating furnace, and the shell side of the secondary heat exchanger is provided with the inlet and outlet of the combustion air, and the secondary heat exchanger The lower pipe box is provided with a flue gas outlet connected to the chimney, and the flue gas after heat exchange in the primary heat exchanger enters the tube side of the secondary heat exchanger to exchange heat with the combustion air entering the shell side; the secondary heat exchange The combustion-supporting air outlet of the device is connected to the burner of the heating furnace through the combustion-supporting hot air pipe, and the condensed water outlet is provided at the bottom of the secondary heat exchanger.

The high-efficiency heating furnace uses natural gas as fuel, the burner burns natural gas, and the heat generated is transferred to the intermediate water in the pot shell through the furnace and smoke pipe in the pot shell. After the intermediate water absorbs heat, it is condensed by water vapor Heat transfer or hot water temperature difference heat transfer, the heat is transferred to the working medium heat exchanger located inside or outside the pot shell, and the medium in the heat exchanger is heated.

After the flue gas in the flue pipe has fully exchanged heat with the water in the pot shell, it still has a relatively high temperature and contains a large amount of heat energy. The flue gas enters the tube side of the primary heat exchanger through the flue, and exchanges heat with the low-temperature heated medium entering the shell side. The medium after absorbing the heat of the flue gas enters the working medium heat exchanger of the heating furnace through the pipe and is heated. The furnace continues to heat up. The flue gas after heat exchange in the primary heat exchanger enters the tube side of the secondary heat exchanger, and exchanges heat again with the combustion air sent by the fan (or directly) to the shell side of the secondary heat exchanger to further reduce the temperature of the flue gas. When the temperature is lower than the condensation temperature of the flue gas, part of the water vapor in the flue gas condenses from a vapor state to a liquid state, releasing a large amount of latent heat of vaporization. The low-temperature flue gas and condensed water are discharged through the bottom of the secondary heat exchanger, the condensed water is discharged from the condensed water outlet, and the low-temperature flue gas is discharged through the chimney. The high-temperature combustion-supporting air heated by the secondary heat exchanger enters the inlet of the burner (or the burner and the fan are integrated) through the air duct, and is mixed with natural gas for combustion.

Adopt the utility model of above-mentioned technical scheme, compared with prior art, its beneficial effect is:

The heating furnace is equipped with a two-stage heat exchanger. The high-temperature flue gas discharged from the heating furnace is used to exchange heat with the heated medium and the combustion air in turn. After two-stage flue gas heat exchange, the heat in the flue gas is fully utilized, which significantly improves the heating efficiency. The thermal efficiency of the furnace can make the thermal efficiency of the heating furnace reach more than 95%.

As preferably, the further technical scheme of the utility model is:

The working medium heat exchanger is arranged on the upper part of the furnace and the smoke pipe in the pot shell, and the working medium heat exchanger in the pot shell is a coil-type tube bundle or a tube-and-tube bundle heat exchanger.

The working medium heat exchanger is set outside the pot shell and located on the top of the pot shell. The working medium heat exchanger outside the pot shell is a disc-shaped tube-bundle heat exchanger with a shell or a shell-and-tube heat exchanger. The pot shell and the working medium The shells of the heat exchangers are connected through steam pipes and return water pipes.

Description of drawings

Fig. 1 is a schematic structural view of the utility model embodiment in which the working fluid heat exchanger is located in the pot shell;

Fig. 2 is the A direction view of Fig. 1;

Fig. 3 is the B direction view of Fig. 1;

Fig. 4 is a schematic structural view of an embodiment of the utility model in which the working medium heat exchanger is located outside the pot shell;

Fig. 5 is the A direction view of Fig. 4;

Fig. 6 is the B direction view of Fig. 4;

In the figure: 1- pot shell, 2- furnace liner, 3- smoke pipe, 4- working medium heat exchanger, 5- smoke box, 6- burner, 7- primary heat exchanger, 8- secondary heat exchange Device, 9-chimney, 10-air duct, 11-flue, 12-fan, 13-condensed water outlet, 14-heated medium outlet, 15-flue gas inlet, 16-heated medium inlet, 17-heated Air outlet, 18-flue gas outlet, 19-heated air inlet, 20-heated medium inlet of working fluid heat exchanger, 21-heated medium outlet of working fluid heat exchanger, 22-low temperature flue gas outlet, 23-base Block, 24-return water pipeline, 25-steam pipeline.

Detailed ways

The utility model is described in detail below in conjunction with the embodiments, the purpose is only to better understand the content of the utility model, so the examples given are not limitations to the content of the utility model.

A high-efficiency heating furnace, as shown in Figure 1, Figure 2, and Figure 3, mainly consists of a pot shell 1, a furnace liner 2, a smoke pipe 3, a working medium heat exchanger 4, a smoke box 5, a burner 6, and a primary heat exchanger 7. The secondary heat exchanger 8, the chimney 9, the air duct 10, the flue 11, the fan 12, and the base 23 are composed. The pot shell 1 is a horizontal cylinder structure, and the inside of the pot shell 1 is provided with a furnace 2 and a flue gas. The pipe 3 and the smoke pipe 3 can be a single smoke pipe or multiple smoke pipes. The furnace gall 2 and the smoke pipe 3 are immersed in the heat transfer medium water in the pot shell 1, and the furnace gall 2 and the smoke pipe 3 are provided with Working fluid heat exchanger 4, and the working fluid heat exchanger 4 is located above the water surface of the heat transfer medium, and the working fluid heat exchanger 4 is a coil-shaped tube bundle or a tube-and-tube bundle heat exchanger; The box 5 and the smoke box 5 are provided with a flue gas outlet 18; the front end of the furnace 2 is provided with a burner 6;

The outer side of the pot shell 1 is provided with a primary heat exchanger 7 and a secondary heat exchanger 8, the primary heat exchanger 7 and the secondary heat exchanger 8 are shell-and-tube heat exchangers, and the primary heat exchanger 7 is located in The top of the secondary heat exchanger 8 is a vertical assembly structure, and the tubes of the two-stage heat exchangers are connected in series; the primary heat exchanger 7 is a heat exchanger for flue gas and heated working fluid, and the primary heat exchanger 7 is respectively provided with a heated medium inlet 16, a heated medium outlet 14, and a flue gas inlet 15. The flue gas inlet 15 is connected to the flue gas outlet 18 of the smoke box 5 through a flue 11, and the heated medium outlet 14 is connected to the flue gas outlet 1 through a medium pipe. The working medium heat exchanger is connected by the heating medium inlet 20; the secondary heat exchanger 8 is a heat exchanger for the flue gas and the combustion air of the heating furnace, and the secondary heat exchanger 8 is respectively provided with a heated air inlet 19, a heated air Outlet 17, low-temperature flue gas outlet 22, heated air inlet 19 connected to fan 12, heated air outlet 17 connected to burner 6 of the heating furnace through air duct 10, low-temperature flue gas outlet 22 connected to chimney 9; secondary heat exchanger 8. A condensed water outlet 13 is provided at the bottom.

The primary heat exchanger 7, the secondary heat exchanger 8, the chimney 9 and the fan 12 are collectively installed on the base 23.

The high-efficiency heating furnace uses natural gas as fuel. The burner 6 burns the natural gas, and the heat generated is transferred to the intermediate water in the pot shell 1 through the furnace 2 and the smoke pipe 2 in the pot shell 1. After the intermediate water absorbs heat, it passes through The water vapor condensation heat transfer method transfers heat to the working medium heat exchanger 4 located in the pot shell 1 to heat the medium in the heat exchanger.

After fully exchanging heat with the water in the pot shell 1, the flue gas in the flue pipe 3 still has a relatively high temperature and contains a large amount of heat energy. These flue gases enter the tube side of the primary heat exchanger 7 through the flue 11 .

The low-temperature heated medium enters the shell side of the primary heat exchanger 7 from the heated medium inlet 16, where it exchanges heat with the flue gas. After the low-temperature heated medium absorbs the heat of the flue gas, it is discharged from the heated medium outlet 14 and passes through the The pipeline enters the working medium heat exchanger 4 from the heated medium inlet 20 of the working medium heat exchanger to continue heating, and the heated medium passes through the heated medium outlet 21 of the working medium heat exchanger to be discharged to the external transportation process.

The flue gas after heat exchange in the primary heat exchanger 7 enters the tube side of the secondary heat exchanger 8, and the combustion-supporting air is sent to the shell side of the secondary heat exchanger 8 through the fan 12 through the heated air inlet 19, and the combustion-supporting air and the smoke Gas heat exchange absorbs the heat in the flue gas and further reduces the temperature of the flue gas. When the temperature is lower than the condensation temperature of the flue gas, part of the water vapor in the flue gas condenses from a vapor state to a liquid state, releasing a large amount of latent heat of vaporization. The low-temperature flue gas is sent to the chimney 9 through the low-temperature flue gas outlet 22 of the secondary heat exchanger 8 to be discharged; the condensed water is discharged through the condensed water outlet 13 at the bottom of the secondary heat exchanger 8 .

The high-temperature combustion-supporting air heated by the secondary heat exchanger 8 enters the burner 6 through the heated air outlet 17 through the air duct 10, and is mixed with natural gas for combustion.

Compared with the high-efficiency heating furnace shown in Fig. 1, Fig. 2 and Fig. 3, the high-efficiency heating furnace shown in Fig. 4, Fig. 5 and Fig. 6 only lies in that the setting position of the working medium heat exchanger 4 is different, that is, the working medium The mass heat exchanger 4 is arranged on the outside of the pot shell 1 and is located on the top of the pot shell 1. The working medium heat exchanger 4 outside the pot shell 1 is a disc-shaped tube-bundle heat exchanger with a shell or a shell-and-tube heat exchanger. The shell 1 communicates with the shell of the working fluid heat exchanger 4 through a steam pipe 25 and a return water pipe 24 . The high-temperature water vapor generated in the pot shell 1 enters the working medium heat exchanger 4 through the steam pipe 25, exchanges heat with the heated medium in the working medium heat exchanger 4, and transfers the heat to the heated medium, and the water vapor releases the latent heat of vaporization Afterwards, it is condensed into a liquid state from the vapor state, and returns to the pot shell 1 through the return pipe 24 .

The fan 12 can be integrated with the burner 6 , and the outlet of the fan 12 can also be connected to the shell-side inlet of the secondary heat exchanger 8 .

The above descriptions are only preferred and feasible embodiments of the present utility model, and are not intended to limit the scope of rights of the present utility model. within the scope of rights.

Claims (3)

1. A high-efficiency heating furnace, including a pot shell, a working medium heat exchanger, a burner, a furnace liner, a smoke pipe, a smoke box, a chimney, a flue, an air duct, a fan, and the furnace liner and the smoke pipe are arranged in the pot shell And submerged in the heat transfer medium water, a vacuum valve is installed on the top of the pot shell; it is characterized in that it also includes a primary heat exchanger and a secondary heat exchanger, both of which are shell and tube type Heat exchanger, the first-stage heat exchanger is located on the top of the second-stage heat exchanger, which is a vertical assembly structure, and the tubes of the two-stage heat exchangers are connected in series; the first-stage heat exchanger is the exchange between the flue gas and the heated working fluid Heater, the tube-side inlet of the first-stage heat exchanger is connected to the high-temperature flue gas outlet of the smoke box through the flue, and the shell-side of the first-stage heat exchanger is provided with the inlet and outlet of the heated medium, and the heated medium and the high-temperature flue gas in the tube-side The gas is exchanged for heat, and then enters the working medium heat exchanger of the heating furnace; the secondary heat exchanger is a heat exchanger between the flue gas and the combustion air of the heating furnace, and the inlet and outlet of the combustion air are provided on the shell side of the secondary heat exchanger , the tube box at the lower part of the secondary heat exchanger is provided with a flue gas outlet connected to the chimney, the flue gas after heat exchange in the primary heat exchanger enters the tube side of the secondary heat exchanger, and is exchanged with the combustion air entering the shell side Heat; the combustion-supporting air outlet of the secondary heat exchanger is connected to the burner of the heating furnace through the combustion-supporting hot air pipe, and the bottom of the secondary heat exchanger is provided with a condensed water outlet. 2. The high-efficiency heating furnace according to claim 1, characterized in that: the working fluid heat exchanger is arranged on the upper part of the furnace and the smoke pipe in the pot shell, and the working medium heat exchanger in the pot shell is a disc-shaped tube bundle or Shell and tube bundle heat exchanger. 3. The high-efficiency heating furnace according to claim 1, characterized in that: the working medium heat exchanger is arranged outside the pot shell and is located on the top of the pot shell, and the working medium heat exchanger outside the pot shell is a disc type with a shell Tube bundle heat exchanger or shell-and-tube heat exchanger, the pot shell and the shell of the working medium heat exchanger are connected through steam pipes and return water pipes.