Nitrogen sealing protection device for photovoltaic chemical storage tank

Abstract

The utility model discloses a photovoltaic chemical storage tank nitrogen seal protection device which comprises a blowdown pipe and a blow-down pipe which are connected to the top end of a storage tank, the blow-down pipe is connected with a buffer tank, a heat exchange structure is arranged in the buffer tank, and the top of the storage tank is further connected with a pressure sensor. And the pressure sensor is in signal connection with a controller of the automatic pressure supplementing valve and the automatic pressure release valve on the air pipe and the blow-down pipe. The effect of improving the operation safety of the photovoltaic-grade chemical storage tank is achieved, and the effects of improving the environmental safety and reducing the raw material loss can be achieved in the mode of cooling and recycling photovoltaic-grade chemicals.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic grade chemical storage tank nitrogen seal technical field especially a photovoltaic grade chemical storage tank nitrogen seal protection device. BACKGROUND

[0002] The photovoltaic grade chemical storage tank nitrogen seal device is composed of a nitrogen supplement valve, a pressure relief valve and the like, and is mainly used for maintaining the internal pressure of the storage tank within a production control range, avoiding direct contact of the material in the storage tank with air, preventing the material from being contaminated and causing environmental pollution and ensuring the safety of the storage tank.

[0003] In actual use, when nitrogen is supplemented in the photovoltaic grade chemical storage tank, volatile photovoltaic grade chemical gas may be entrapped in the tail gas, and the supplemented nitrogen gas entrains the volatile photovoltaic grade chemical and is discharged, which leads to waste of nitrogen gas and loss of material and causes pollution to the environment.

[0004] The photovoltaic grade chemical is a kind of dangerous chemical with high toxicity, and has strong corrosiveness and strong volatility. Therefore, the storage mode of the photovoltaic grade chemical storage tank is required to be extremely high, and direct contact with air should be avoided to prevent the material from being contaminated. SUMMARY

[0005] The technical problem to be solved by the utility model is that part of the photovoltaic grade chemical is entrapped in the tail gas and discharged when the photovoltaic grade chemical storage tank is supplemented with gas, which leads to waste of nitrogen gas and loss of material.

[0006] To solve the above technical problem, the utility model adopts the technical scheme of a photovoltaic grade chemical storage tank nitrogen seal protection device, which comprises a gas supplement pipe and a vent pipe connected to the top end of a storage tank, a buffer tank connected to the vent pipe, a heat exchange structure arranged in the buffer tank, a pressure sensor connected to the top of the storage tank, and a controller connected to the automatic pressure supplement valve and the automatic pressure relief valve on the gas pipe and the vent pipe.

[0007] Preferably, the heat exchange structure comprises a partition cylinder coaxially fixed in the buffer tank, the inner wall of the partition cylinder is provided with a heat exchange channel, the heat exchange channel is connected to a coolant circulation pipeline, a gap is arranged between the bottom of the partition cylinder and the bottom of the buffer tank, the vent pipe comprises a connecting pipe connecting the storage tank and the buffer tank and a vent pipe body connected to the top of the side wall of the buffer tank, and the bottom of the buffer tank is connected to a recovery pipe.

[0008] Preferably, the inner wall of the partition cylinder is fixedly connected with heat exchange plates, the heat exchange plates are internally provided with flow-through cavities, and the flow-through cavities are in communication with the heat exchange channels.

[0009] Preferably, the heat exchange plates are staggered on the opposite inner walls of the partition cylinder.

[0010] Preferably, the bottom end and the top end of the separation cylinder are connected with an infusion pipe and a liquid return pipe respectively, and the infusion pipe and the liquid return pipe are communicated with the heat exchange channel.

[0011] Preferably, the top end of the separation cylinder is fixedly connected with the inner top of the tank body of the buffer tank through a ring-shaped connecting seat.

[0012] Preferably, a flow cavity is arranged in the connecting seat, a temperature sensor is arranged in the flow cavity, the flow cavity is communicated with the heat exchange channel and the liquid return pipe, a sealing ring is connected to the outer side wall of the connecting seat, and the sealing ring fills the gap between the connecting seat and the buffer tank.

[0013] Preferably, an annular groove is arranged in the inner top of the tank body, and the top of the sealing ring is filled in the annular groove.

[0014] Preferably, the top end of the storage tank is provided with an emergency pressure relief port and a manhole.

[0015] Preferably, the top of the storage tank is provided with a safety valve.

[0016] The utility model provides a kind of photovoltaic grade chemical storage tank nitrogen seal protection device, with following beneficial effects.

[0017] 1, by being respectively installed automatic pressure compensation valve and automatic pressure relief valve on the air supplement pipe and vent pipe of storage tank, the air pressure in storage tank is detected by pressure sensor in storage tank, and according to the change of air pressure in storage tank, automatic air supplement or exhaust is carried out, the stability of the pressure in storage tank is maintained, and then the safety performance of storage tank is improved.

[0018] 2, by being connected buffer tank on vent pipe, when the pressure in storage tank is too high, automatic pressure relief valve can discharge part of gas into buffer tank, then the gas in buffer tank is cooled by heat exchange structure in buffer tank, the separation of nitrogen and photovoltaic grade chemical is realized, and photovoltaic grade chemical can be recycled by recovery pipe. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in connection with drawings and examples:

[0020] Figure 1 For the structure diagram of the embodiment of the utility model.

[0021] Figure 2 For the internal structure diagram of buffer tank in the embodiment of the utility model.

[0022] Figure 3 For the sectional view of separation cylinder in buffer tank in the embodiment of the utility model.

[0023] In the figure: 1, the storage tank; 2, the air supplement pipe; 3, the connecting pipe; 4, the buffer tank; 41, the tank body; 42, the separation cylinder; 43, the heat exchange plate; 44, the liquid conveying pipe; 45, the connecting seat; 46, the liquid return pipe; 47, the sealing ring; 48, the flow cavity; 5, the vent pipe; 6, the recovery pipe; 7, the automatic pressure supplement valve; 8, the automatic pressure relief valve; 9, the pressure sensor. DETAILED DESCRIPTION

[0024] As Figures 1-3 shown, the utility model provides a kind of photovoltaic grade chemical storage tank nitrogen seal protection device, including the air supplement pipe 2 and vent pipe 5 being connected in the top of storage tank 1, vent pipe 5 is connected with buffer tank 4, heat exchange structure is provided in buffer tank 4, storage tank 1 top is also connected with pressure sensor 9, pressure sensor 9 signal connects the controller of automatic pressure supplement valve 7 and automatic pressure relief valve 8 on air supplement pipe 2 and vent pipe 5.

[0025] The pressure control range of storage tank 1 inside is between L-H, when pressure exceeds H value, controller receives signal from pressure sensor 9, controller controls automatic pressure relief valve 8 to open at this time, until pressure drops to H value, control automatic pressure relief valve 8 to close;When pressure is lower than L value, controller receives signal from pressure sensor 9, controller controls automatic pressure supplement valve 7 to open at this time, air supplement pipe 2 transports nitrogen to storage tank 1, and automatic pressure supplement valve 7 is closed when the internal air pressure of storage tank 1 exceeds L value.

[0026] The gas in storage tank 1 is discharged into buffer tank 4 through automatic pressure relief valve 8, and the heat exchange structure in buffer tank 4 is cooled to condense the photovoltaic grade chemicals mixed in the gas, so that the product and nitrogen are separated.

[0027] As Figure 1 and Figure 2 shown. The heat exchange structure includes separation cylinder 42 coaxially fixed in buffer tank 4, heat exchange channel is arranged on the inner wall of separation cylinder 42, heat exchange channel is connected with coolant circulation pipeline, gap is arranged between the bottom of separation cylinder 42 and the bottom of buffer tank 4, vent pipe 5 includes connecting pipe 3 connecting storage tank 1 and buffer tank 4 and vent pipe 5 body connected to the top of the side wall of buffer tank 4, and recovery pipe 6 is connected to the bottom of buffer tank 4.

[0028] When the gas in the tank 1 is vented into the buffer tank 4, the gas first enters the inner top of the partition cylinder 42 and flows along the partition cylinder 42, and in the process of gas flow, the gas is cooled by contacting the inner wall of the partition cylinder 42, so that the photovoltaic grade chemicals in the gas are condensed, and the generated chemical liquid flows to the inner bottom of the buffer tank 4 and is recovered through the recovery pipe 6, and the remaining gas flows along the gap between the partition cylinder 42 and the inner wall of the buffer tank 4 after flowing out from the bottom of the partition cylinder 42, and then is vented into the vent pipe 5.

[0029] As shown in Figure 2 , in order to increase the contact area between the gas and the partition cylinder 42 and improve the heat exchange efficiency of the gas. The inner wall of the partition cylinder 42 is fixedly connected with a heat exchange plate 43, and the heat exchange plate 43 is internally provided with a flow-through cavity 48 which is in communication with the heat exchange channel. The cooling liquid in the heat exchange channel enters the heat exchange plate 43 to cool the surface of the heat exchange plate 43, and when the gas flows along the partition cylinder 42, it is guided by the heat exchange plate 43, which prolongs the flow path of the gas and enables the gas to contact the surface of the heat exchange plate 43, thereby cooling the gas and condensing the photovoltaic grade chemicals in the gas to achieve separation.

[0030] As shown in Figure 2 , in order to prolong the gas flow channel in the partition cylinder 42 and increase the contact area with the gas. The heat exchange plates 43 are staggered on the opposite inner walls of the partition cylinder 42.

[0031] As shown in Figure 2 , the bottom end and the top end of the partition cylinder 42 are respectively connected with a liquid inlet pipe 44 and a liquid return pipe 46, and the liquid inlet pipe 44 and the liquid return pipe 46 are in communication with the heat exchange channel. The cooling liquid is transported upward from the bottom end of the partition cylinder 42, so that the temperature of the bottom of the partition cylinder 42 is lower than that of the top, and the gas is continuously cooled after entering the partition cylinder 42 until the photovoltaic grade chemicals in the gas are condensed.

[0032] As shown in Figure 2 , in order to improve the stability of the installation of the partition cylinder 42. The top end of the partition cylinder 42 is fixedly connected with the inner top of the tank body 41 of the buffer tank 4 through a ring-shaped connecting seat 45. The partition cylinder 42 is connected to the inner top of the buffer tank 4 in a hoisting manner, and the connecting seat 45 is installed on the top of the partition cylinder 42, and the connecting seat 45 is fixedly connected with the inner top of the buffer tank 4, so as to improve the stability of the partition cylinder 42.

[0033] As shown in Figure 2The connecting seat 45 is internally provided with a flow cavity 48, the flow cavity 48 is internally provided with a temperature sensor, the flow cavity 48 is communicated with the heat exchange channel and the liquid return pipe 46, the outer side wall of the connecting seat 45 is connected with a sealing ring 47, and the sealing ring 47 fills the gap between the connecting seat 45 and the buffer tank 4.

[0034] By arranging the flow cavity 48 in the connecting seat 45, the temperature sensor arranged in the flow cavity 48 is used for detecting the temperature of the cooling liquid flowing out of the heat exchange channel, and when the temperature exceeds the set temperature, the flow rate of the cooling liquid in the infusion pipe 44 is increased, so that the quality of heat exchange is ensured. The sealing ring 47 is arranged to increase the sealing property between the connecting seat 45 and the tank body 41.

[0035] As shown in Figure 2 In order to improve the stability of the installation of the sealing ring 47, an annular groove is arranged at the inner top of the tank body 41, and the top of the sealing ring 47 is filled in the annular groove. Threaded holes are arranged at the groove bottom of the annular groove, and communication holes matched with the threaded holes are arranged on the sealing ring 47, the sealing ring 47 is locked on the sealing ring through bolts, so that the stability of the installation of the sealing ring 47 is ensured, and the sealing effect is ensured; and the arrangement of the annular groove ensures that the sealing ring 47 wraps the connecting seat 45.

[0036] As shown in Figure 1 The storage tank 1 is provided with an emergency pressure relief port and a manhole at the top end. The workers can realize the processing plan for various emergency situations through the manhole, and the safety of the operation of the storage tank 1 is ensured through the emergency pressure relief port.

[0037] As a preferred embodiment of the utility model, in order to further improve the safety of the operation of the storage tank 1, a safety valve is arranged at the top of the storage tank 1. The safety valve can urgently discharge the gas at the top of the storage tank 1.

Claims

1. A photovoltaic grade chemical storage tank nitrogen blanketing protection apparatus characterized by: The application discloses a gas supplementing and discharging device for a storage tank.

2. A nitrogen seal protection device for photovoltaic grade chemical storage tanks as claimed in claim 1, wherein: The heat exchange structure comprises a separation cylinder (42) coaxially arranged in the buffer tank (4), a heat exchange channel is arranged on the inner wall of the separation cylinder (42), the heat exchange channel is connected with a coolant circulating pipeline, a gap is arranged between the bottom of the separation cylinder (42) and the inner bottom of the buffer tank (4), the gas discharging pipe (5) comprises a connecting pipe (3) connecting the storage tank (1) and the buffer tank (4) and a gas discharging pipe (5) body connected to the top of the side wall of the buffer tank (4), and the bottom of the buffer tank (4) is connected with a recovery pipe (6).

3. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as described in claim 2, wherein: The inner side wall of the separation cylinder (42) is fixedly connected with a heat exchange plate (43), the heat exchange plate (43) is internally provided with a flow cavity (48), and the flow cavity (48) is communicated with the heat exchange channel.

4. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as described in claim 3, wherein: The heat exchange plates (43) are staggered and distributed on the opposite inner side walls of the separation cylinder (42).

5. A photovoltaic grade chemical storage tank nitrogen blanketing protection apparatus as claimed in any one of claims 2 to 4 wherein: The bottom end and the top end of the separation cylinder (42) are respectively connected with a liquid delivery pipe (44) and a liquid return pipe (46), and the liquid delivery pipe (44) and the liquid return pipe (46) are communicated with the heat exchange channel.

6. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as defined in claim 5, wherein: The top end of the separation cylinder (42) is fixedly connected with the inner top of the tank body (41) of the buffer tank (4) through a ring-shaped connecting seat (45).

7. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as defined in claim 6, wherein: The connecting seat (45) is internally provided with the flow cavity (48), a temperature sensor is arranged in the flow cavity (48), the flow cavity (48) is communicated with the heat exchange channel and the liquid return pipe (46), a sealing ring (47) is connected to the outer side wall of the connecting seat (45), and the sealing ring (47) fills the gap between the connecting seat (45) and the buffer tank (4).

8. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as defined in claim 7, wherein: The inner top of the tank body (41) is provided with an annular groove, and the top of the sealing ring (47) is filled in the annular groove.

9. A photovoltaic grade chemical storage tank nitrogen seal protection apparatus as described in claim 1 wherein: An emergency pressure relief port and a manhole are arranged at the top end of the storage tank (1).

10. A photovoltaic grade chemical storage tank nitrogen blanketing protection apparatus as claimed in claim 1, wherein: A safety valve is arranged at the top of the storage tank (1).

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