Waste heat recovery device for carbon disulfide production process
By designing a waste heat recovery device and utilizing a series structure of convection furnace tubes and heat exchangers, the problem of unused waste heat in carbon disulfide production was solved, achieving efficient heat utilization and reduced production costs.
Patent Information
- Application Number
- CN202520346364.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-28
AI Technical Summary
In existing carbon disulfide production processes, waste heat is not effectively utilized, resulting in energy waste and high production costs.
Design a waste heat recovery device, including a convection section furnace tube, a first heat exchanger, a second heat exchanger, and a third heat exchanger. Through the series-connected heat exchanger structure, the high-temperature flue gas discharged from the heating furnace is used to preheat the mixture, combustion air, and soft water, thereby improving the heat utilization rate.
It improves the utilization rate of flue gas heat, reduces natural gas consumption, improves combustion efficiency, saves production costs, and reduces waste heat.
Smart Images
Figure CN223954123U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of chemical industry, in particular to a waste heat recovery device of carbon disulfide production process. BACKGROUND
[0002] The chemical enterprise uses natural gas and sulfur as raw materials to produce carbon disulfide. Specifically, the raw material natural gas is heated to about 400 DEG C by the preheating section of the heating furnace, mixed with liquid sulfur (about 140 DEG C) from the underground tank in the static mixer (about 220 DEG C), heated to about 650 DEG C by the heating section of the heating furnace, and then enters the adiabatic reactor to complete the reaction to generate carbon disulfide product and byproduct hydrogen sulfide.
[0003] The heating furnace uses the induced draft fan to draw negative pressure, and the ambient air is drawn into the furnace to burn with fuel natural gas to heat the raw material natural gas and sulfur in the furnace tube. The flue gas (about 750 DEG C) is cooled to about 150 DEG C by the heating furnace drum and soft water heat exchange, and then sent to the chimney by the induced draft fan for emission. The soft water in the heating furnace drum is heated by the flue gas to 0.8 MPa steam for use, and in the case of steam surplus, it will be vented to waste.
[0004] Therefore, how to effectively utilize the waste heat of the carbon disulfide production process to improve energy utilization and reduce heat pollution is a problem to be solved by those skilled in the art. SUMMARY
[0005] The utility model aims at the deficiency of prior art, provides a waste heat recovery device of carbon disulfide production process, its simple structure, the transformation cost is low, can effectively improve the utilization rate of carbon disulfide production process waste heat, and then reduce the natural gas consumption, save production cost.
[0006] The technical scheme of the utility model is: a waste heat recovery device of carbon disulfide production process, including convection section furnace tube, first heat exchanger, second heat exchanger, the convection section furnace tube is arranged in the exhaust flue of tubular heating furnace, the import of convection section furnace tube is connected with the discharge port of static mixer, the export of convection section furnace tube is connected with the heating section furnace tube of tubular heating furnace, the hot medium passage import of first heat exchanger is connected with the exhaust flue export of tubular heating furnace, the hot medium passage import of second heat exchanger is connected with the hot medium passage export of first heat exchanger, and the hot medium passage export of second heat exchanger provides high-temperature flue gas for heating furnace drum, the cold medium passage import of first heat exchanger is connected with a blower, and the cold medium outlet of first heat exchanger supplies gas to the hearth of tubular heating furnace, the cold medium passage import of second heat exchanger is connected with soft water source, and the cold medium outlet of second heat exchanger supplies water to the heating furnace drum.
[0007] The convection section furnace tube extends in a serpentine shape, and the inlet of the convection section furnace tube is located above the outlet of the convection section furnace tube.
[0008] The first heat exchanger and the second heat exchanger are both column tube heat exchangers, the shell side of the column tube heat exchanger is the heat medium channel, and the tube side of the column tube heat exchanger is the cold medium channel.
[0009] The exhaust flue of the tubular heating furnace extends in an L-shaped curve, the convection section furnace tube is arranged in the horizontal section of the exhaust flue extending in an L-shaped curve and is curved in the horizontal direction.
[0010] The third heat exchanger is further included, the heat medium channel inlet of the third heat exchanger is connected with the heat medium channel outlet of the second heat exchanger, the heat medium channel outlet of the third heat exchanger provides high-temperature flue gas for the heating furnace steam drum, the cold medium channel inlet of the third heat exchanger is connected with the air blower, and the cold medium outlet of the third heat exchanger is connected with the cold medium channel inlet of the first heat exchanger.
[0011] The above technical scheme has the following beneficial effects:
[0012] 1. The waste heat recovery device of carbon disulfide production process comprises a convection section furnace tube, a first heat exchanger and a second heat exchanger, and is used for recycling and utilizing the flue gas waste heat of a heating furnace. The convection section furnace tube is arranged in a flue gas discharge duct of the tubular heating furnace, the inlet of the convection section furnace tube is connected with the discharge port of a static mixer, the outlet of the convection section furnace tube is connected with the heating section furnace tube of the tubular heating furnace, the material discharged from the static mixer is a preheated mixture of natural gas and liquid sulfur, the preheated mixture is heated and raised in temperature by heat exchange with the flue gas of the heating furnace in the convection section furnace tube, and then is sent to the heating section furnace tube for continuous temperature rising, so that the consumption of natural gas as the fuel of the heating furnace can be reduced. The inlet of the heat medium channel of the first heat exchanger is connected with the outlet of the flue gas discharge duct of the tubular heating furnace, the inlet of the heat medium channel of the second heat exchanger is connected with the outlet of the heat medium channel of the first heat exchanger, that is, the heat medium channels of the first heat exchanger and the second heat exchanger are connected in series, the outlet of the heat medium channel of the second heat exchanger provides high-temperature flue gas for the steam drum of the heating furnace, that is, the high-temperature flue gas discharged from the flue gas discharge duct of the heating furnace is sent to the steam drum of the heating furnace as a heat source after being sequentially heat-exchanged in the first heat exchanger and the second heat exchanger, so that the heat of the flue gas discharged from the heating furnace can be fully utilized, and the utilization rate of the heat of the flue gas can be improved. The inlet of the cold medium channel of the first heat exchanger is connected with a blower, and the outlet of the cold medium channel of the first heat exchanger supplies air to the hearth of the tubular heating furnace as combustion-supporting air. The combustion-supporting air is forced to enter the cold medium channel of the first heat exchanger by the blower, is heated, and then is sent to the hearth, so that the combustion efficiency of natural gas can be effectively improved, and the consumption of natural gas in the heating furnace can be reduced. The inlet of the cold medium channel of the second heat exchanger is connected with a soft water source, and the outlet of the cold medium channel of the second heat exchanger supplies water to the steam drum of the heating furnace. The soft water entering the steam drum is preheated by the second heat exchanger before being sent to the steam drum, so that the preheated soft water can be converted into steam by the flue gas with utilized waste heat in the steam drum, and the waste of the flue gas waste heat can be avoided. In addition, the second heat exchanger is arranged downstream of the first heat exchanger. On the basis of improving the temperature of combustion-supporting air, improving the combustion efficiency of natural gas and meeting the preheating of soft water, the risk of rupture of the cold medium channel due to excessive temperature and boiling of soft water in the second heat exchanger can be avoided.
[0013] 2. The convection section furnace tube extends in a serpentine shape, the inlet of the convection section furnace tube is located above the outlet of the convection section furnace tube, and the convection section furnace tube is arranged in the horizontal section of the L-shaped curved flue gas discharge duct and is curved in the horizontal direction. The convection section furnace tube with such a structure can improve the utilization rate of the flue gas waste heat discharged from the heating furnace, the temperature rising efficiency of the mixture (natural gas and liquid sulfur), and effectively reduce the risk of blockage of liquid sulfur in the convection section furnace tube.
[0014] 3. The third heat exchanger, the hot medium passage inlet of the third heat exchanger is connected with the hot medium passage outlet of the second heat exchanger, the hot medium passage outlet of the third heat exchanger provides high-temperature flue gas for the heating furnace steam drum, the cold medium passage inlet of the third heat exchanger is connected with the air blower, and the cold medium outlet of the third heat exchanger is connected with the cold medium passage inlet of the first heat exchanger, namely, the first heat exchanger, the second heat exchanger and the third heat exchanger are connected in series, the first heat exchanger is located at the upstream, the third heat exchanger is located at the downstream, and the second heat exchanger is located between the first heat exchanger and the second heat exchanger, so that the temperature of the flue gas preheated for the steam drum is still high, the combustion-supporting air is preheated in two stages through the third heat exchanger and the first heat exchanger, the temperature of the combustion-supporting air is effectively increased, and the combustion efficiency of the natural gas in the furnace is further improved.
[0015] Further description will be given below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The utility model discloses a connection schematic diagram.
[0017] In the drawings, 1 is the convection section furnace tube, 2 is the first heat exchanger, 3 is the second heat exchanger, 4 is the air blower, and 5 is the third heat exchanger. DETAILED DESCRIPTION
[0018] Reference should be made to Figure 1The utility model provides a specific embodiment of a carbon disulfide production process waste heat recovery device. The carbon disulfide production process waste heat recovery device comprises a convection section furnace tube 1, a first heat exchanger 2, and a second heat exchanger 3. The convection section furnace tube 1 is arranged in the flue of a tubular heating furnace, the inlet of the convection section furnace tube 1 is connected to the outlet of a static mixer, and the outlet of the convection section furnace tube 1 is connected to the heating section furnace tube of the tubular heating furnace. In this embodiment, the flue of the tubular heating furnace extends in an L-shaped curve, specifically, the flue of the tubular heating furnace extends vertically upwards first, and then extends horizontally to the left after being bent, forming an L-shaped structure. The convection section furnace tube 1 extends in a serpentine curve, and the inlet of the convection section furnace tube is located above the outlet of the convection section furnace tube. Specifically, the convection section furnace tube 1 is arranged in the horizontal section of the L-shaped flue and extends in a horizontal curve. The inlet of the hot medium passage of the first heat exchanger 2 is connected to the outlet of the flue of the tubular heating furnace, the inlet of the hot medium passage of the second heat exchanger 3 is connected to the outlet of the hot medium passage of the first heat exchanger 2, and the outlet of the hot medium passage of the second heat exchanger 3 provides high-temperature flue gas to the steam drum of the heating furnace. In this embodiment, the first heat exchanger and the second heat exchanger are both shell-and-tube heat exchangers, the shell side of the shell-and-tube heat exchanger is the hot medium passage, and the tube side of the shell-and-tube heat exchanger is the cold medium passage. The inlet of the cold medium passage of the first heat exchanger 2 is connected to a blower 4, the outlet of the cold medium of the first heat exchanger 2 supplies air to the hearth of the tubular heating furnace, the inlet of the cold medium passage of the second heat exchanger 3 is connected to a soft water source, and the outlet of the cold medium of the second heat exchanger 3 supplies water to the steam drum of the heating furnace. This embodiment further comprises a third heat exchanger 5, which is also a shell-and-tube heat exchanger. The inlet of the hot medium passage of the third heat exchanger 5 is connected to the outlet of the hot medium passage of the second heat exchanger 3, the outlet of the hot medium passage of the third heat exchanger 5 provides high-temperature flue gas to the steam drum of the heating furnace, the inlet of the cold medium passage of the third heat exchanger 5 is connected to the blower 4, and the outlet of the cold medium of the third heat exchanger 5 is connected to the inlet of the cold medium passage of the first heat exchanger 2.
[0019] The working principle of the utility model is as follows: the flue gas generated by the heating furnace has a temperature of about 750 DEG C, exchanges heat with the natural gas and sulfur mixture in the convection section furnace tube, heats the mixture to about 600 DEG C, the mixture enters the heating section furnace tube of the original heating furnace, and is heated to about 650 DEG C; the flue gas discharged into the hot medium passage of the first heat exchanger has a temperature of about 380 DEG C, the combustion-supporting air heated by the third heat exchanger and the first heat exchanger is heated to about 300 DEG C, and then is sent to the hearth of the heating furnace; the soft water is heated in the second heat exchanger and then is sent to the steam drum; the flue gas discharged from the hot medium passage of the third heat exchanger is used as a heating medium to convert the soft water in the steam drum into 0.8Mpa steam, which is used by the device.
Claims
1. A waste heat recovery device for a carbon disulfide production process, characterized in that: Includes convection section furnace tubes (1), first heat exchanger (2), and second heat exchanger (3). The convection section furnace tube (1) is installed in the flue gas duct of the tubular heater. The inlet of the convection section furnace tube (1) is connected to the discharge port of the static mixer, and the outlet of the convection section furnace tube (1) is connected to the heating section furnace tube of the tubular heater. The inlet of the heat medium channel of the first heat exchanger (2) is connected to the outlet of the flue gas duct of the tubular heater, the inlet of the heat medium channel of the second heat exchanger (3) is connected to the outlet of the heat medium channel of the first heat exchanger (2), and the outlet of the heat medium channel of the second heat exchanger (3) provides high-temperature flue gas to the boiler drum of the heater. The inlet of the cold medium channel of the first heat exchanger (2) is connected to a blower (4), and the outlet of the cold medium of the first heat exchanger (2) supplies gas to the furnace of the tubular heating furnace. The inlet of the cold medium channel of the second heat exchanger (3) is connected to a soft water source, and the outlet of the cold medium of the second heat exchanger (3) supplies water to the steam drum of the heating furnace.
2. The waste heat recovery device for the carbon disulfide production process according to claim 1, characterized in that: The convection section furnace tube (1) extends in a serpentine bend, with the inlet of the convection section furnace tube located above the outlet of the convection section furnace tube.
3. The waste heat recovery device for the carbon disulfide production process according to claim 1, characterized in that: Both the first heat exchanger (2) and the second heat exchanger (3) are shell-and-tube heat exchangers. The shell side of the shell-and-tube heat exchanger is the hot medium passage, and the tube side of the shell-and-tube heat exchanger is the cold medium passage.
4. The waste heat recovery device for the carbon disulfide production process according to claim 2, characterized in that: The flue of the tubular heating furnace extends in an L-shape, and the convection section furnace tube (1) is set in the horizontal section of the L-shaped flue and bends in the horizontal direction.
5. The waste heat recovery device for the carbon disulfide production process according to claim 1, characterized in that: It also includes a third heat exchanger (5), the inlet of the hot medium channel of the third heat exchanger (5) is connected to the outlet of the hot medium channel of the second heat exchanger (3), the outlet of the hot medium channel of the third heat exchanger (5) provides high-temperature flue gas to the boiler drum of the heating furnace, the inlet of the cold medium channel of the third heat exchanger (5) is connected to the blower (4), and the outlet of the cold medium of the third heat exchanger (5) is connected to the inlet of the cold medium channel of the first heat exchanger (2).