Coupling cryogenic defrosting device

Abstract

The utility model relates to a coupling cryogenic defrosting device which comprises a flame-retardant shell, an oil gas channel, a refrigeration channel and a base support, the flame-retardant shell is fixed on the plane of the base support, a cold box and a shell layer channel are arranged in the flame-retardant shell, the oil gas channel and the refrigeration channel penetrate through the flame-retardant shell and are connected with the shell layer channel in a penetrating mode, and a partition plate is arranged in the shell layer channel. The gas outlet pipe is located on the lower side of the shell layer channel, the hot water pipe network is fixed in the cold box and connected with the nitrogen purging pipe and the water inlet pipe, a flame retardant is arranged in the flame-retardant shell, the oil gas pipeline and the refrigeration pipeline are arranged on a top plate of the flame-retardant shell, oil gas achieves U-shaped movement in the shell layer channel through the partition plate, and the cooling effect is enhanced; the transversely arranged cooling pipelines can be provided with different cooling grades, the universality is improved, the problems of oil gas cryogenic recovery, long defrosting time of the cold box, low efficiency and high hot defrosting load of the refrigerating unit are solved, and the defrosting efficiency and the operation safety are improved.

Description

Technical Field

[0001] The utility model relates to a coupled cryogenic defrosting device. Background Art

[0002] The oil and gas cryogenic technology is a mature VOCs oil and gas treatment technology. The main principle is to condense and recover the organic matter in the oil and gas at low temperature. Generally, it is divided into multi-stage refrigeration according to the refrigeration working conditions. Common ones include secondary condensation, tertiary condensation, cryogenic, etc. During the oil and gas condensation process, due to complex components or the presence of moisture, frost will form inside the cold box. The frost formation affects the working efficiency and service life of the cold box, and regular defrosting is required.

[0003] In view of the fact that during the oil and gas condensation process, due to complex components or the presence of moisture, frost will form inside the cold box. The frost formation affects the working efficiency and service life of the cold box, and regular defrosting is required. The commonly used hot nitrogen defrosting and refrigerant hot defrosting take a long time and have low efficiency, especially in winter in the north, which even affects the use of oil and gas recovery equipment. Therefore, a cold box device coupled with a hot water pipe network for defrosting is needed to improve the defrosting efficiency and service performance of the oil and gas recovery equipment and ensure the safe and stable operation of environmental protection facilities. Content of the Utility Model

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies of the prior art and provide a coupled cryogenic defrosting device, which melts the frost inside the cold box through a hot water channel and a refrigeration channel. The purpose of the utility model is achieved as follows:

[0005] A coupled cryogenic defrosting device includes a flame-retardant shell, an oil and gas channel, a refrigeration channel and a base bracket. The base bracket is provided with at least 6 support legs and a plane. The flame-retardant shell is fixedly arranged on the plane. The flame-retardant shell is of a cuboid structure. A cold box is arranged inside the flame-retardant shell. A shell layer channel is fixedly arranged inside the cold box. The oil and gas channel penetrates the flame-retardant shell and is connected to the shell layer channel in a through manner. The refrigeration channel penetrates the flame-retardant shell and is connected to the shell layer channel in a through manner. A partition plate is arranged along a first direction inside the shell layer channel. The first direction is the extending direction of the shell layer channel. An air outlet pipe is arranged on the lower side of the shell layer channel. The air outlet pipe is cylindrical. A plurality of air outlet holes are circumferentially arranged along the axis of the air outlet pipe on the outer side of the air outlet pipe. A hot water pipe network is arranged on the lower side of the air outlet pipe. The hot water pipe network is fixedly arranged inside the cold box. The hot water pipe network is connected with a nitrogen purge pipe and a water inlet pipe. A flame retardant is arranged inside the flame-retardant shell. Both the oil and gas channel and the refrigeration channel are arranged on the upper side of the flame-retardant shell. The oil and gas channel is arranged on the left side of the top plate of the flame-retardant shell and is arranged along the axis for at least 3. The refrigeration channel is arranged on the upper side of the top plate of the flame-retardant shell and is arranged along the transverse direction for at least 5. The hot water pipe network is of a mesh structure.

[0006] To adapt to the load of the refrigerant, the diameter of the refrigeration channel is 20 cm, and the material of the refrigeration channel is stainless steel.

[0007] To adapt to the load of nitrogen, the diameter of the nitrogen purge pipe is 20 cm, and the material of the nitrogen purge pipe is galvanized steel pipe.

[0008] To achieve a better flame retardant effect, the flame retardant is ammonium polyphosphate or polyurethane foam flame retardant.

[0009] To better disperse the oil and gas and have a larger contact area with the hot water pipe network, the number of gas outlet holes on the gas outlet pipe is at least 8.

[0010] The hot water temperature of the hot water pipe network is between 50°C and 80°C, which can raise the temperature in the cold box to about 20°C in a short time, shorten the original defrosting time by half, and improve the defrosting efficiency.

[0011] Beneficial effects: By setting the partition plate, the oil and gas can achieve a U-shaped movement in the shell layer channel, with better cooling effect, and the laterally arranged cooling pipes can set different cooling levels, with stronger versatility; it solves the problems of deep cold recovery of oil and gas, long defrosting time and low efficiency of the cold box, and high load of the hot melt defrosting of the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic cross-sectional structure diagram of a coupled deep cold defrosting device;

[0013] Figure 2 is a schematic cross-sectional structure diagram of a coupled deep cold defrosting device from another perspective;

[0014] Figure 3 is a schematic top view structure diagram of a coupled deep cold defrosting device;

[0015] In the figure: 1, flame retardant shell; 2, base bracket; 3, flame retardant; 4, hot water pipe network; 5, cold box; 6, refrigeration channel; 7, oil and gas channel; 8, shell layer channel; 9, partition plate; 10, gas outlet pipe; 11, gas outlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0017] In this embodiment:

[0018] Please refer to Figures 1 - 3, A coupled cryogenic defrosting device, comprising a flame-retardant housing 1, an oil-gas channel 7, a refrigeration channel 6 and a base bracket 2. The base bracket 2 is provided with at least 6 support legs and a plane, and the flame-retardant housing 1 is fixedly arranged on the plane. The flame-retardant housing 1 is of a cuboid structure. Inside the flame-retardant housing 1, there is a cold box 5. Inside the cold box 5, a shell layer channel 8 is fixedly arranged. The oil-gas channel 7 passes through the flame-retardant housing 1 and is connected to the shell layer channel 8 in a through manner. The refrigeration channel 6 passes through the flame-retardant housing 1 and is connected to the shell layer channel 8 in a through manner. Inside the shell layer channel 8, a partition plate 9 is arranged along a first direction, and the first direction is the extending direction of the shell layer channel 8. Below the shell layer channel 8, there is an air outlet pipe 10. The air outlet pipe 10 is cylindrical. Along the circumference of the axis of the air outlet pipe 10, a number of air outlet holes 11 are arranged on the outer side of the air outlet pipe 10. Below the air outlet pipe 10, there is a hot water pipe network 4. The hot water pipe network 4 is fixedly arranged inside the cold box 5. The hot water pipe network 4 is connected with a nitrogen purging pipe and a water inlet pipe. Inside the flame-retardant housing 1, there is a flame retardant 3. Both the oil-gas channel 7 and the refrigeration channel 6 are arranged on the upper side of the flame-retardant housing 1. The oil-gas channel is arranged on the left side of the top plate of the flame-retardant housing 1 and is arranged at least 3 along the axial direction. The refrigeration channel is arranged on the upper side of the top plate of the flame-retardant housing 1 and is arranged at least 5 along the transverse direction. The hot water pipe network 4 is of a mesh structure.

[0019] The diameter of the refrigeration channel 6 is 20 cm, and the material of the refrigeration channel 6 is stainless steel. The diameter of the nitrogen purging pipe is 20 cm, and the material of the nitrogen purging pipe is galvanized steel pipe. The flame retardant 3 is ammonium polyphosphate or polyurethane foam flame retardant 3. The number of air outlet holes 11 on each air outlet pipe 10 is at least 8. The hot water temperature of the hot water pipe network 4 is between 50°C and 80°C, and in this embodiment, it is 60°C.

[0020] The following is the operating principle of this device:

[0021] The oil and gas enters the shell channel 8 through the oil and gas channel 7, and the refrigerant enters the shell channel 8 through the refrigeration channel 6. After the two are mixed, the temperature of the oil and gas will decrease. There are 5 refrigeration channels 6, and the oil and gas channel 7 is arranged on the left side. During operation, the refrigeration channel 6 will be opened as needed to let in the refrigerant. For example, when the cold box 5 needs to achieve precooling at 10°C, primary refrigeration at -10°C, secondary refrigeration at -40°C, tertiary refrigeration at -70°C, and deep refrigeration at -110°C, the refrigeration channels are opened from left to right respectively. The number of opened channels corresponding to the refrigeration levels should be 1, 2, 3, 4, and 5 respectively. The partition plate 9 makes the oil and gas move in a U shape in the shell channel 8, and the refrigerant condenses the oil and gas. The refrigerant is R22 or liquid nitrogen. The hot water pipe network 4 is laid on the bottom layer of the cold box 5; the purging nitrogen is connected to the hot water pipe network 4; the cold box 5 equipment can reduce the temperature of the oil and gas to -70°C through multi-stage condensation, and the organic matter in the oil and gas is condensed and collected through the collecting pipe for reuse; frost will form on the inner surface of the cold box 5 during the condensation process of the oil and gas; the hot water pipe network 4 melts the frost in the cold box 5 after passing through 60°C hot water; the purging nitrogen purges the hot water pipe network 4 clean and replaces it for protection for the next working cycle.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A coupled cryogenic defrosting device, characterized in that It includes a flame-retardant housing, an oil-gas channel, a refrigeration channel, and a base bracket. The base bracket is provided with at least six support legs and a plane. The flame-retardant housing is fixedly arranged on the plane. The flame-retardant housing is of a cuboid structure. Inside the flame-retardant housing, there is a cold box. Inside the cold box, a shell layer channel is fixedly arranged. The oil-gas channel penetrates through the flame-retardant housing and is connected to the shell layer channel in a through manner. The refrigeration channel penetrates through the flame-retardant housing and is connected to the shell layer channel in a through manner. A partition plate is arranged in the shell layer channel along a first direction, and the first direction is the extending direction of the shell layer channel. An air outlet pipe is arranged on the lower side of the shell layer channel. The air outlet pipe is cylindrical, and a number of air outlet holes are circumferentially arranged along the axis of the air outlet pipe on the outer side of the air outlet pipe. A hot water pipe network is arranged on the lower side of the air outlet pipe. The hot water pipe network is fixedly arranged in the cold box. The hot water pipe network is connected with a nitrogen purge pipe and a water inlet pipe. There is a flame retardant in the flame-retardant housing. Both the oil-gas channel and the refrigeration channel are arranged on the upper side of the flame-retardant housing. The oil-gas channel is arranged on the left side of the top plate of the flame-retardant housing and is arranged at least three along the axial direction. The refrigeration channel is arranged on the upper side of the top plate of the flame-retardant housing and is arranged at least five along the transverse direction. The hot water pipe network is of a mesh structure.

2. The coupling deep-freezing defrosting device according to claim 1, characterized in that , The diameter of the refrigeration channel is 20 cm, and the material of the refrigeration channel is stainless steel.

3. The coupled cryogenic defrosting device according to claim 1, characterized in that, The diameter of the nitrogen purge pipe is 20 cm, and the material of the nitrogen purge pipe is galvanized steel pipe.

4. The coupled cryogenic defrosting device according to claim 1, wherein, The flame retardant is ammonium polyphosphate or polyurethane foam flame retardant.

5. A coupled cryogenic defrosting device according to claim 1, characterized in that, The number of air outlet holes on the air outlet pipe is at least eight.

6. The coupling deep-freezing defrosting device according to claim 1, wherein The hot water temperature of the hot water pipe network is between 50 °C and 80 °C.

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