CN101644507A - Process gas cooling system - Google Patents

Abstract

The invention relates to a process gas cooling system, which comprises a solar heat collector (1), a hot water storage tank (3), a chilled water preparation device (9), and a cooling heat exchanger (12); wherein The hot water produced in the solar heat collector (1) enters the heat storage tank (3) to provide the required hot water for the chilled water preparation device (9); the chilled water preparation device (9) is the The cooling heat exchanger (12) provides the required chilled water; the cooling heat exchanger (12) cools the incoming process gas. The invention utilizes solar refrigeration technology, fully utilizes renewable energy, and saves steam or electric energy consumption required by conventional cooling devices.

Description

A process gas cooling system

technical field

The invention relates to a cooling system for process gas, in particular to a system for cooling process gas by using solar energy.

Background technique

In the existing process gas cooling process, compressors or steam refrigeration technologies are used, which require a lot of electric energy and high energy consumption, especially when cooling the process gas under the condition of large flow rate and high atmospheric temperature. The energy consumption is huge.

For example, in the field of ironmaking, during the operation of the blast furnace blower, the required shaft power is greatly affected by the atmospheric conditions. Taking the 4000m ³ blast furnace blower as an example: in summer, assuming that the average daytime temperature is 25°C, the operating power of the blower at this time is about 40,000kW, and the average temperature in the morning, evening and night is assumed to be 15°C. At this time, the operating power of the blower is about 38,800kW. At this time, the power consumption of the blower is reduced by about 3% compared with the daytime; in spring and autumn, assuming that the average temperature during the day is 15°C, the blower operates The power is about 35000kW, and the average temperature in the morning, evening and night is assumed to be 8°C. At this time, the operating power of the blower is about 34000kW. At this time, the power consumption of the blower is reduced by about 2.5% compared with that in the daytime (the above parameters are only considering the air suction and cooling of the blower, but not reached Preliminary calculation results under atmospheric dew point conditions). In the case of using dehumidification blast, the air temperature changes during the day and night are not conducive to the stable operation of the dehumidification system, and will eventually affect the stable operation of the blast furnace.

Contents of the invention

The object of the present invention is to provide a process gas cooling system using renewable energy.

The purpose of the present invention is achieved in the following manner:

A process gas cooling system, characterized in that: the process gas cooling system includes a solar collector, a hot water storage tank, a chilled water preparation device, and a cooling heat exchanger;

Wherein the hot water produced in the solar heat collector enters the hot water storage tank to provide the required hot water for the chilled water preparation device; the chilled water preparation device provides the required chilled water for the cooling heat exchanger; The cooling heat exchanger cools the incoming gas.

The water outlet of the solar heat collector is connected to the water inlet of the hot water storage tank through a pipeline, and the water outlet of the hot water storage tank is connected to the hot water inlet of the chilled water preparation device through a pipeline with a water pump, The hot water outlet of the chilled water preparation device is returned to the water inlet of the solar heat collector through a pipeline;

The chilled water preparation device connects the chilled water inlet and the chilled water outlet of the cooling heat exchanger through a pipeline with a water pump.

In order to make full use of the waste heat at the air outlet of the blower unit and reduce the deficiency when the solar radiation is low, the air outlet of the gas cooling system is connected to the air inlet of the air blower through a pipeline; the air outlet of the air blower is also connected with an auxiliary heat heater, The auxiliary heat heater is respectively connected with the water outlet of the solar heat collector and the water inlet of the heat storage tank through pipes.

In order to further cool down and dehumidify the process gas, a secondary cooling and dehumidifying device is connected between the air outlet of the cooling heat exchanger and the blower, and the secondary cooling and dehumidifying device includes a secondary cooling and dehumidifying device , secondary chilled water preparation device;

The secondary chilled water preparation device provides the required chilled water for the secondary cooling heat exchanger, and the secondary chilled water preparation device connects the chilled water inlet of the secondary cooling heat exchanger with the chilled water through a pipeline with a water pump. exit;

In order to provide better quality gas, the air inlet of the cooling heat exchanger is also connected with a gas filter.

The refrigeration technology utilizing solar energy of the present invention makes full use of renewable energy, can save about 30% of the energy consumption in the case of using conventional steam or electric energy for cooling and cooling, and can also save about 3% of the driving power of the blower. In addition, through the solar refrigeration technology, the operation of the secondary cooling and dehumidification of the blast furnace blower is stabilized, the effect of cooling and dehumidification is guaranteed, and the stability of the blast furnace condition and energy saving and production increase are guaranteed.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure, part (1) is a solar heat collector, part (2) is an auxiliary heat heater, part (3) is a heat storage tank, and parts (4), (4'), (5), (6) , (7) are pipelines, piece (8) is a water pump, piece (9) is a chilled water preparation device, piece (10) is a water pump, pieces (11), (11') are pipelines, and piece (12) is a cooling water exchange Heater, part (13) is a secondary chilled water preparation device, part (14) is a water pump, parts (15), (15') are pipelines, part (16) is a secondary cooling dehumidifier, and part (17) , (18) are pipelines, and part (19) is a blower.

Detailed ways

Embodiments of the invention will be further described below in conjunction with the accompanying drawings.

The present invention is suitable for air suction cooling and dehumidification of blast furnace blower, and can also be used in other process gas cooling and dehumidification occasions (such as cooling of air at the inlet of gas turbine compressor), especially for process gas under the condition of large flow rate and relatively high atmospheric temperature Cool down. The following is an example of blast furnace blower air suction cooling and dehumidification:

As shown in Figure 1, the water outlet of the solar collector 1 is connected to the water inlet of the hot water storage tank 3 through the pipeline 5, and the 3 water outlets of the hot water storage tank are connected to the chilled water preparation device through the pipeline 4' with the water pump 8 The hot water inlet of 9, the hot water outlet of the chilled water preparation device 9 returns to the water inlet of the solar collector 1 through the pipeline 4; 12 chilled water inlets and chilled water outlets. The air that enters the cooling heat exchanger 12 from the air inlet flows out at the air outlet after being cooled.

The air inlet of the cooling heat exchanger 12 is also connected with a gas filter to filter the atmosphere. A secondary cooling device is also connected between the air outlet of the cooling heat exchanger 12 and the blower 19, and the secondary cooling device includes a secondary cooling dehumidifier 16, a secondary chilled water preparation device 13; the secondary chilled water preparation device 13 is The secondary cooling heat exchanger 16 provides the required chilled water, and the secondary chilled water preparation device 13 connects the chilled water inlet and the chilled water outlet of the secondary cooling dehumidifier 16 through pipelines 15 and 15' with a water pump 14; The cooling water inlet and outlet are also provided on the first-stage chilled water preparation device 13 . The air outlet of the blower group is also connected with auxiliary heat heater 2, and auxiliary heat heater 2 is connected with the water outlet of solar heat collector 1 and the water inlet of heat storage tank 3 respectively by pipelines 6,7. Wherein the solar heat collector (1) is a flat plate heat collector or a vacuum tube heat collector. The auxiliary heat exchanger 2 is a shell-and-tube heat exchanger or a partitioned wall heat exchanger. The chilled water preparation device 9 is an ejection refrigeration system, an absorption refrigeration system or an adsorption refrigeration system. The cooling heat exchanger 12 and the secondary cooling dehumidifier 16 are partition wall heat exchangers. The chilled water preparation device 13 is a compressor refrigeration system or a steam refrigeration system.

In use, the hot water whose temperature is lowered after passing through the chilled water preparation device 9 enters the solar heat collector 1 through the pipe fitting 4 to absorb solar radiation energy during the day to produce hot water, and the hot water enters the heat storage tank 3 through the pipe fitting 5 . When the solar radiation is insufficient, the hot water with reduced temperature enters the auxiliary heat heater 2 arranged on the blower exhaust pipe section through the pipe fitting 6, and the heated water enters the heat storage tank 3 through the pipe fitting 7, and passes through the auxiliary heat heater 2. The air is lowered slightly and supplied to the rear stove. The prepared hot water is supplied to the chilled water preparation device 9 through the water pump 8, and returns to the solar heat collection system after use. So reciprocating use.

The hot water supplied by the hot water pump 8 enters the chilled water preparation device 9, and the cooling water required by the chilled water preparation device is provided externally. The prepared chilled water is pressurized by the water pump 10 and enters the cooling heat exchanger 12. The used chilled water Return to the chilled water preparation system through pipeline 11'. The air filtered by the gas filter enters the cooling heat exchanger 12 through the pipeline, and the air temperature is lowered from the atmospheric temperature to a certain temperature and then enters the secondary cooling dehumidifier 16 through the pipeline 17 . The chilled water produced by the secondary chilled water preparation device 13 driven by other energy sources (electric energy or steam, etc.) is pressurized by the water pump 14 and enters the secondary cooling dehumidifier 16, and the used chilled water returns to the secondary chiller through the pipeline 15 Water preparation device 13. The air cooled by the first stage is cooled and dehumidified in the secondary cooling dehumidifier 16, part of the water vapor in the air is condensed and removed by the demister, and the air humidity is reduced to meet the requirements of the ironmaking process before entering the blast furnace blower 19.

In the present invention, the gas cooling system takes full advantage of the consistent characteristics of solar radiation and atmospheric temperature fluctuations. There is less radiation in the morning and evening and at night. At the same time, the atmospheric temperature is low, and the gas cooling system stops operating. After the high temperature, the gas cooling system was put into operation, using solar refrigeration technology to cool down the suction of the blower for the first time, and the temperature of the suction of the blower was controlled relatively stably at the atmospheric temperature level in the morning and evening, which stabilized the load of the secondary cooling device and reduced the use of compression alone. Electric energy or other energy required by machine or steam refrigeration technology. When the auxiliary heat heater 2 is installed, in the case of insufficient solar radiation, hot water is prepared using the high-temperature hot air discharged by the blower as auxiliary heat, and hot water is prepared in the auxiliary heat heater 2 to ensure the temperature of the hot water and the temperature of the frozen water. Preparation, so as to ensure the primary cooling effect of the blower suction; when the auxiliary heater 2 is not installed, the total suction cooling and dehumidification effect of the blower can be achieved by adjusting the load ratio of the gas cooling system and the secondary cooling device. In the secondary cooling device, conventional electric energy or steam refrigeration technology can be used to produce chilled water, and the chilled water performs secondary cooling and dehumidification of the air that has undergone primary cooling.

On the basis of the cooling and cooling of the gas cooling system, a secondary chilled water preparation device 13 is installed, and the produced chilled water performs secondary cooling on the suction of the blower. The humidity content of the air reaches a low level. Because the gas cooling system adopts solar refrigeration technology, it makes full use of renewable energy, saves the energy consumption required for secondary cooling, and saves part of the energy for driving the blower, stabilizing the effect of air suction, cooling and dehumidification of the blast furnace blower, thus finally ensuring Blast furnace conditions are stable and energy saving and production increase.

The inlet air filter of the blower 19, the cooling heat exchanger 12, and the secondary cooling dehumidifier 16 can be integrated, that is, three-in-one equipment --- air filtration and cooling and dehumidifying combination device, and can also be split.

In the practical engineering application of the present invention, the form and area of the solar collector 1, the temperature of the chilled water in the refrigeration system, the cooling heat exchanger 12, and the secondary cooling and dehumidification can be determined according to the meteorological conditions in different regions and different operating conditions of the blast furnace. Main performance parameters such as the heat exchange area of the device 16. Of course, multiple gas cooling devices can also be cascaded, so that a better effect on gas cooling can be achieved. These are all protected by the present invention.

Claims (11)

1. A process gas cooling system, characterized in that: the process gas cooling system includes a solar heat collector (1), a heat storage tank (3), a chilled water preparation device (9), a cooling heat exchanger (12 ); Wherein the hot water produced in the solar heat collector (1) enters the heat storage tank (3) to provide the required hot water for the chilled water preparation device (9); the chilled water preparation device (9) is the The cooling heat exchanger (12) provides the required chilled water; the cooling heat exchanger (12) lowers the temperature of the incoming gas. 2. The process gas cooling system according to claim 1, characterized in that: the water outlet of the solar heat collector (1) is connected to the water inlet of the heat storage tank (3) through a pipe (5), and the The (3) water outlet of the heat storage tank is connected to the hot water inlet of the chilled water preparation device (9) through a pipeline (4') with a water pump (8), and the heat of the chilled water preparation device (9) The water outlet flows back to the water inlet of the solar heat collector (1) through the pipeline (4); The chilled water preparation device (9) connects the chilled water inlet and the chilled water outlet of the cooling heat exchanger (12) through pipelines (11, 11') with a water pump (10). 3. The process gas cooling system according to claim 2, characterized in that: the gas outlet of the process gas cooling system is connected to the air inlet of the blower (19) through a pipeline (17); the outlet of the blower (19) The gas port is also connected with an auxiliary heat heater (2), and the auxiliary heat heater (2) is respectively connected with the water outlet of the solar heat collector (1) and the inlet of the heat storage tank (3) through pipelines (6, 7). The mouth of the water is connected. 4. The process gas cooling system according to claim 3, characterized in that: a secondary cooling and dehumidification system is connected between the air outlet of the cooling heat exchanger (12) and the blower (19), and the secondary The primary cooling and dehumidification system includes a secondary cooling and dehumidifying device (16), and a secondary chilled water preparation device (13); The secondary frozen water preparation device (13) provides the required frozen water for the secondary cooling dehumidifier (16), and the secondary frozen water preparation device (13) passes through a pipeline (15) with a water pump (14). , 15 ') to connect the chilled water inlet and the chilled water outlet of the secondary cooling dehumidifier (16). 5. The process gas cooling system according to claim 4, characterized in that: the solar heat collector (1) is a flat plate heat collector or a vacuum tube heat collector. 6. The process gas cooling system according to claim 4, characterized in that: the auxiliary heater (2) is a shell-and-tube heat exchanger or a partitioned wall heat exchanger. 7. The process gas cooling system according to claim 4, characterized in that: the chilled water preparation device (9) is an ejection refrigeration system, an absorption refrigeration system or an adsorption refrigeration system. 8. The process gas cooling system according to claim 4, characterized in that: the cooling heat exchanger (12) and the secondary cooling dehumidifier (16) are partition wall heat exchangers. 9. The process gas cooling system according to claim 4, characterized in that: the chilled water preparation device (13) is a compressor refrigeration system or a steam refrigeration system. 10. The process gas cooling system according to claim 4, characterized in that: the air inlet of the cooling heat exchanger (12) is also connected with a gas filter. 11. The process gas cooling system according to claim 10, characterized in that: the cooling heat exchanger (12), gas filter and secondary cooling dehumidifier (16) are integral or split.

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