Propane gasification system and method

Abstract

The invention relates to the technical field of propane gasification, in particular to a propane gasification system and method.The gasification system comprises a shell-and-tube heat exchanger, and the shell-and-tube heat exchanger is connected with a tube pass fluid inlet tube, a tube pass fluid outlet tube, a shell pass fluid inlet tube and a shell pass fluid outlet tube; a coil pipe is wound outside the shell-and-tube heat exchanger, one end of the coil pipe is connected with a steam pipe, and the other end of the coil pipe is connected with a tube pass fluid inlet pipe. A coil pipe shut-off valve and a coil pipe adjusting valve are arranged on the coil pipe; by arranging the coil pipe, steam is introduced into the coil pipe, on the basis that circulating water in a tube pass heats liquid-state alanyl ammonia, the steam can be used for heating the liquid-state alanyl ammonia, the steam can be mixed with the circulating water after being condensed, and the temperature of the circulating water is increased after mixing; finally, the evaporation effect of the liquid propane is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of propane gasification, and in particular to a propane gasification system and method. Background Art

[0002] In the prior art, a shell and tube heat exchanger is used to gasify liquid propane. Circulating water and liquid propane are respectively introduced into the tube side and shell side of the shell and tube heat exchanger for heat exchange. The heat of the circulating water is transferred to the liquid propane, and the liquid propane absorbs heat and evaporates to gasify. In order to ensure that the circulating water does not freeze after the heat exchange, the pressure of the liquid propane needs to be adjusted so that the saturation temperature of the liquid propane in the shell and tube heat exchanger reaches above 0°C. The temperature of the existing circulating water is usually not high enough, resulting in poor evaporation effect of the liquid propane. Summary of the invention

[0003] The main purpose of the present invention is to provide a propane gasification system and method to solve the problem in the prior art that when a shell and tube heat exchanger is used to gasify liquid propane, the temperature of the circulating water is not high enough, resulting in poor evaporation effect of the liquid propane.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a propane gasification system, including a shell and tube heat exchanger, the shell and tube heat exchanger is connected with a tube-side fluid inlet pipe, a tube-side fluid outlet pipe, a shell-side fluid inlet pipe and a shell-side fluid outlet pipe; a coil is wound around the outside of the shell and tube heat exchanger, one end of the coil is connected to a steam pipe, and the other end is connected to the tube-side fluid inlet pipe.

[0005] Furthermore, a coil shut-off valve and a coil regulating valve are provided on the coil.

[0006] Furthermore, a steam-water mixing heater is connected to the tube-side fluid inlet pipe, and the steam-water mixing heater is connected to the steam pipe; a heater shutoff valve and a heater regulating valve are arranged on the steam pipe near the steam-water mixing heater.

[0007] Furthermore, the shell-side fluid inlet pipe is connected to a liquid propylammonia storage tank.

[0008] Furthermore, a liquid propane regulating valve is connected to the shell-side fluid inlet pipe.

[0009] Furthermore, the shell-side fluid outlet pipe is connected to an propylamine buffer tank.

[0010] Furthermore, a gaseous propylamine regulating valve is connected to the shell-side fluid outlet pipe.

[0011] The present invention also provides a propane gasification method using the propane gasification system of claim 1, comprising the following steps: S1. Use the shell-side fluid inlet pipe to introduce liquid propane into the shell side of the shell and tube heat exchanger, and control the pressure of the liquid propane so that the saturation temperature of the liquid propane in the shell side is greater than 0°C; S2. Use the tube-side fluid inlet pipe to introduce circulating water into the tube side of the shell and tube heat exchanger. The temperature of the circulating water is 20-30°C. The circulating water and liquid propane are heat exchanged. S3, the steam pipe passes steam into the coil, the temperature of the steam is 190-210℃, and the steam and liquid propane are heat exchanged; the steam after heat exchange becomes condensed water, the temperature of the condensed water is 90-100℃; the condensed water flows into the tube side fluid inlet pipe and mixes with the circulating water, the temperature of the mixed water is 35-40℃; the mixed water enters the tube side of the shell and tube heat exchanger 1; S4. The liquid propane in the shell side absorbs heat and evaporates into gaseous propane, and the gaseous propane is discharged to the outside through the shell side fluid outlet pipe.

[0012] The beneficial effects of the present invention are: By setting up a coil and passing steam into the coil, the liquid propane can be heated by steam on the basis of the circulating water in the tube heating the liquid propane. The steam can be mixed with the circulating water after condensation to increase the temperature of the circulating water, and finally the evaporation effect of the liquid propane is enhanced.

[0013] By setting a coil regulating valve, the flow rate of steam in the coil can be adjusted.

[0014] By setting up a steam-water mixing heater, it can be used as a backup for the coil and activated when the coil is damaged or under maintenance. It can increase the circulating water temperature and enhance the evaporation effect of liquid propane. However, due to the large vibration of the steam-water mixing heater when in use, it can only be used as a backup in emergency situations and cannot completely replace the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 It is a structural schematic diagram of the propane gasification system in the embodiment; In the figure: 1. Shell and tube heat exchanger; 2. Tube-side fluid inlet pipe; 3. Tube-side fluid outlet pipe; 4. Shell-side fluid inlet pipe; 5. Shell-side fluid outlet pipe; 6. Coil; 7. Steam pipe; 8. Steam-water mixing heater; 9. Liquid propylammonia storage tank; 10. Liquid propane regulating valve; 11. propylammonia buffer tank; 12. Gaseous propylammonia regulating valve. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] like Figure 1 As shown, according to an embodiment of the present invention, a propane gasification system is provided, including a shell and tube heat exchanger 1, the shell and tube heat exchanger 1 is connected with a tube-side fluid inlet pipe 2, a tube-side fluid outlet pipe 3, a shell-side fluid inlet pipe 4 and a shell-side fluid outlet pipe 5; the shell and tube heat exchanger 1 is spirally wound with a coil 6 on the outside, one end of the coil 6 is connected to a steam pipe 7, and the other end is connected to the tube-side fluid inlet pipe 2.

[0019] The coil 6 is provided with a coil shut-off valve and a coil regulating valve; the inner diameter of the coil 6 is 15 mm, the wall thickness is 2 mm, the coil 6 is fixed to the outside of the shell and tube heat exchanger 1 with pipe clamps, and 3 pipe clamps are provided for each circle of the pipeline.

[0020] The pipe-side fluid inlet pipe 2 is connected with a steam-water mixing heater 8, and the steam-water mixing heater 8 is connected with a steam pipe 7; a heater shutoff valve and a heater regulating valve are arranged on the steam pipe 7 near the steam-water mixing heater 8.

[0021] The shell-side fluid inlet pipe 4 is connected to a liquid propane storage tank 9 ; the shell-side fluid inlet pipe 4 is connected to a liquid propane regulating valve 10 .

[0022] The shell-side fluid outlet pipe 5 is connected to an propylammonia buffer tank 11; the shell-side fluid outlet pipe (5) is connected to a gaseous propylammonia regulating valve 12.

[0023] This embodiment also provides a propane gasification method using the propane gasification system of claim 1, comprising the following steps: S1, using the shell-side fluid inlet pipe 4 to introduce liquid propane into the shell side of the shell and tube heat exchanger 1, and adjusting the liquid propane regulating valve 10 to control the pressure of the liquid propane to be greater than 0.37 MPa, so that the saturation temperature of the liquid propane in the shell side is greater than 0°C; S2, using the tube-side fluid inlet pipe 2 to pass circulating water into the tube side of the shell and tube heat exchanger 1, the temperature of the circulating water is 20-30°C, and the circulating water and liquid propane are heat exchanged; S3, steam pipe 7 passes steam into coil 6, the temperature of steam is 190-210℃, steam and liquid propane are heat exchanged; the steam after heat exchange becomes condensed water, the temperature of condensed water is 90-100℃; condensed water flows into tube side fluid inlet pipe 2 and mixes with circulating water, the temperature of mixed water is 35-40℃; the mixed water enters the tube side of shell and tube heat exchanger 1; S4. The liquid propane in the shell side absorbs heat and evaporates into gaseous propane. The gaseous propane is discharged to the propylammonia buffer tank 11 through the shell side fluid outlet pipe 5. The pressure of the gaseous propylammonia in the propylammonia buffer tank 11 is maintained at less than 150 KPa by the gaseous propylammonia regulating valve 12.

[0024] The beneficial effects of the present invention are: By setting up a coil and passing steam into the coil, the liquid propane can be heated by steam on the basis of the circulating water in the tube heating the liquid propane. The steam can be mixed with the circulating water after condensation, and the temperature of the circulating water is increased after mixing, thereby finally enhancing the evaporation effect of the liquid propane.

[0025] By setting the coil regulating valve, the flow of steam in the coil can be adjusted; in winter, the circulating water temperature is low, and the coil regulating valve is fully opened; in summer, the circulating water temperature is high, and when the circulating water temperature is higher than 25°C, the coil steam is turned off to save energy and reduce consumption.

[0026] By setting up a steam-water mixing heater, it can be used as a backup for the coil and activated when the coil is damaged or under maintenance. It can increase the circulating water temperature and enhance the evaporation effect of liquid propane. However, due to the large vibration of the steam-water mixing heater when in use, it can only be used in emergency situations and cannot completely replace the coil.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A propane gasification system, comprising a shell and tube heat exchanger (1), wherein the shell and tube heat exchanger (1) is connected with a tube-side fluid inlet pipe (2), a tube-side fluid outlet pipe (3), a shell-side fluid inlet pipe (4) and a shell-side fluid outlet pipe (5); characterized in that; A coil (6) is wound around the outside of the shell and tube heat exchanger (1); one end of the coil (6) is connected to a steam pipe (7), and the other end is connected to a tube-side fluid inlet pipe (2).

2. The propane gasification system according to claim 1, characterized in that: The coil (6) is provided with a coil shut-off valve and a coil regulating valve.

3. The propane gasification system according to claim 1, characterized in that: The tube-side fluid inlet pipe (2) is connected to a steam-water mixing heater (8), and the steam-water mixing heater (8) is connected to a steam pipe (7); a heater shutoff valve and a heater regulating valve are provided on the steam pipe (7) near the steam-water mixing heater (8).

4. The propane gasification system according to claim 1, characterized in that: The shell-side fluid inlet pipe (4) is connected to a liquid propylamine storage tank (9).

5. The propane gasification system according to claim 4, characterized in that: The shell-side fluid inlet pipe (4) is connected to a liquid propane regulating valve (10).

6. The propane gasification system according to claim 1, characterized in that: The shell-side fluid outlet pipe (5) is connected to an propylamine buffer tank (11).

7. The propane gasification system according to claim 6, characterized in that: The shell-side fluid outlet pipe (5) is connected to a gaseous propylamine regulating valve (12).

8. A propane gasification method using the propane gasification system of claim 1, characterized in that: The following steps are involved: S1. Use the shell-side fluid inlet pipe (4) to introduce liquid propane into the shell side of the shell and tube heat exchanger (1), and control the pressure of the liquid propane so that the saturation temperature of the liquid propane in the shell side is greater than 0° C.; S2, using the tube-side fluid inlet pipe (2) to pass circulating water into the tube side of the shell and tube heat exchanger (1), the temperature of the circulating water being 20-30° C., and the circulating water and liquid propane are heat exchanged; S3, the steam pipe (7) passes steam into the coil (6), the temperature of the steam is 190-210°C, and the steam and liquid propane are heat exchanged; the steam after the heat exchange is converted into condensed water, the temperature of the condensed water is 90-100°C; the condensed water flows into the tube side fluid inlet pipe (2) and circulates, and the temperature of the mixed water is 35-40°C; the mixed water enters the tube side of the shell and tube heat exchanger 1; S4. The liquid propane in the shell side absorbs heat and evaporates into gaseous propane, which is discharged to the outside through the shell side fluid outlet pipe (5).

Images