Energy-saving system of coal lock gas compressor

Abstract

The utility model discloses an energy-saving system of a coal lock gas compressor. The energy-saving system comprises a coal lock, a low-pressure wet-type spiral gas holder, an outlet water seal tank, the coal lock gas compressor, a gasification furnace and a conversion device, a pressure relief opening of the coal lock is communicated with a gas inlet of the low-pressure wet type spiral gas holder through a pipeline, a gas outlet of the low-pressure wet type spiral gas holder is divided into two paths, one path is communicated with a gas inlet of the outlet water seal tank through a pipeline, and the other path and a gas outlet of the outlet water seal tank are both communicated with a gas inlet of the coal lock gas compressor through pipelines. The coal lock gas compressor has the advantages that after being discharged from the low-pressure wet type spiral gas holder, the gas is directly discharged at the inlet of the coal lock gas compressor, so that the pressure of the inlet of the coal lock gas compressor can be adjusted to be close to 3.5 kPa, the amount of the coal lock gas compressor can be increased, and effective waste caused by the fact that an exhaust valve is opened due to the fact that the liquid level of the low-pressure wet type spiral gas holder is too high is relieved. Meanwhile, redundant coal lock gas can be fed into the conversion device, and the exhaust gas is effectively utilized through conversion hydrogen production, so that the effects of energy conservation and emission reduction are achieved.

Description

Technical field:

[0001] The utility model relates to the field of coal gasification, in particular to an energy-saving system for a coal gas lock compressor. Background technology:

[0002] In the process of coal-to-ammonia synthesis, the coal lock is first used to feed the coal powder in the coal bunker to the synthesis furnace. The speed of adding coal powder can be controlled by controlling the airflow. In order to ensure the stable operation of the coal lock, the coal lock needs to be depressurized. The depressurized gas is called coal lock gas. The composition of coal lock gas is raw coal gas. At present, in order to make use of the coal lock gas, the coal lock gas with a pressure of 4kPa (g) and a temperature of 40°C is usually sent to the gas holder for storage. After the coal lock gas enters the gas holder, the pressure drops to 3.5kPa (g). After being buffered by the gas holder, it is sent to the coal lock gas compressor through the outlet water seal tank. After being pressurized to 4.7MPa (g), it is sent back to the gas making device and used for pressurization of the coal lock again.

[0003] However, since the gas valve of the coal-lock gas compressor is prone to wear, the negative pressure at the inlet of the coal-lock gas compressor is too low at -10kPa, resulting in insufficient suction volume at the compressor inlet and a short operating cycle, which often causes a high liquid level alarm in the gas tank and requires part of the coal-lock gas to be discharged to the flare, causing a large waste of resources and economic losses. Utility model content:

[0004] In order to solve the above problems, the purpose of the utility model is to provide a coal-locked gas compressor energy-saving system.

[0005] The utility model is implemented by the following technical solutions:

[0006] A coal lock gas compressor energy-saving system, comprising a coal lock, a low-pressure wet spiral gas holder, an outlet water seal tank, a coal lock gas compressor, a gasifier and a conversion device;

[0007] The discharge port of the coal lock is connected with the feed port of the gasifier, and the raw coal gas outlet of the gasifier is connected with the raw coal gas inlet of the conversion device through a pipeline; the pressure relief port of the coal lock is connected with the air inlet of the low-pressure wet spiral gas holder through a pipeline, and the air outlet of the low-pressure wet spiral gas holder is divided into two paths, one of which is connected with the air inlet of the outlet water seal tank through a pipeline, and the other path and the air outlet of the outlet water seal tank are both connected with the air inlet of the coal lock gas compressor through a pipeline;

[0008] The gas outlet of the coal lock gas compressor is divided into two paths, one of which is connected to the charging port of the coal lock through a pipeline, and the other is connected to the raw coal gas inlet of the conversion device through a pipeline;

[0009] A compressor inlet pressure sensor is provided at the inlet of the coal-locked gas compressor, and a pressure regulating valve is provided on the pipeline connecting the low-pressure wet spiral gas holder and the coal-locked gas compressor;

[0010] The signal output end of the compressor inlet pressure sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the pressure regulating valve.

[0011] Furthermore, a liquid level sensor is provided in the low-pressure wet spiral gas holder, and an exhaust valve is provided at the exhaust port of the low-pressure wet spiral gas holder;

[0012] The signal output end of the liquid level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the exhaust valve.

[0013] Furthermore, a coal lock pressure sensor is provided in the coal lock, a pressure charging valve is provided on the pipeline connecting the coal lock gas compressor and the coal lock, and a conversion valve is provided on the pipeline connecting the coal lock gas compressor and the conversion device;

[0014] The signal output end of the coal lock pressure sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input ends of the charging valve and the conversion valve respectively.

[0015] Advantages of the utility model:

[0016] When the compressor inlet pressure sensor detects that the pressure at the inlet of the coal-lock gas compressor is too low, the controller opens the pressure regulating valve and directly puts the gas coming out of the low-pressure wet spiral gas holder at the inlet of the coal-lock gas compressor, thereby adjusting the compressor inlet pressure to close to 3.5kPa, and then increasing the pressure of the coal-lock gas compressor, alleviating the waste of effective gas caused by opening the exhaust valve of the low-pressure wet spiral gas holder due to excessive liquid level. At the same time, in order to further prevent the effective gas from being discharged to the flare, the excess coal-lock gas can be sent to the conversion device by opening the conversion valve, and the exhaust gas can be effectively utilized through conversion to produce hydrogen, thereby achieving the effect of energy saving and emission reduction. Description of the drawings:

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of system connection of this embodiment;

[0019] Figure 2 This is a control principle diagram of this embodiment.

[0020] In the figure: coal lock 1, low-pressure wet spiral gas holder 2, outlet water seal tank 3, coal lock gas compressor 4, conversion device 5, compressor inlet pressure sensor 6, liquid level sensor 7, coal lock pressure sensor 8, controller 9, pressure regulating valve 10, exhaust valve 11, charging valve 12, conversion valve 13, gasifier 14. Specific implementation method:

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1:

[0023] like Figure 1 , 2 A coal lock gas compressor energy-saving system shown includes a coal lock 1, a low-pressure wet spiral gas holder 2, an outlet water seal tank 3, a coal lock gas compressor 4, a gasifier 14 and a conversion device 5;

[0024] The discharge port of the coal lock 1 is connected with the feed port of the gasifier 14, and the raw coal gas outlet of the gasifier 14 is connected with the raw coal gas inlet of the conversion device 5 through a pipeline; the pressure relief port of the coal lock 1 is connected with the air inlet of the low-pressure wet spiral gas holder 2 through a pipeline, and the air outlet of the low-pressure wet spiral gas holder 2 is divided into two paths, one of which is connected with the air inlet of the outlet water seal tank 3 through a pipeline, and the other of which is connected with the air outlet of the outlet water seal tank 3 through a pipeline and the air inlet of the coal lock gas compressor 4;

[0025] The gas outlet of the coal lock gas compressor 4 is divided into two paths, one of which is connected to the charging port of the coal lock 1 through a pipeline, and the other is connected to the raw coal gas inlet of the conversion device 5 through a pipeline;

[0026] A compressor inlet pressure sensor 6 is provided at the inlet of the coal lock gas compressor 4, and a pressure regulating valve 10 is provided on the pipeline connecting the low-pressure wet spiral gas holder 2 and the coal lock gas compressor 4; a liquid level sensor 7 is provided in the low-pressure wet spiral gas holder 2, and an exhaust valve 11 is provided at the exhaust port of the low-pressure wet spiral gas holder 2; a coal lock pressure sensor 8 is provided in the coal lock 1, a charging valve 12 is provided on the pipeline connecting the coal lock gas compressor 4 and the coal lock 1, and a conversion valve 13 is provided on the pipeline connecting the coal lock gas compressor 4 and the conversion device 5;

[0027] The signal output ends of the compressor inlet pressure sensor 6, the liquid level sensor 7 and the coal lock pressure sensor 8 are all connected to the signal input end of the controller 9, and the signal output end of the controller 9 is respectively connected to the signal input end of the pressure regulating valve 10, the exhaust valve 11, the charging valve 12 and the conversion valve 13.

[0028] Job Description:

[0029] After the coal lock gas enters the low-pressure wet spiral gas holder 2, the pressure drops to 3.5 kPa (g). One path is buffered by the gas holder and sent to the coal lock gas compressor 4 through the outlet water seal tank 3. The other path comes out of the low-pressure wet spiral gas holder 2 and directly merges with the coal lock gas passing through the outlet water seal tank 3 at the inlet of the coal lock gas compressor 4 and is sent to the coal lock gas compressor 4 together. After being pressurized to 4.7 MPa (g), it is sent back to the coal lock 1 to pressurize the coal lock 1, and the remaining coal lock gas is sent to the conversion device 5, and the CO in the raw coal gas is converted into H2 through the conversion device 5 for the subsequent synthetic ammonia process.

[0030] In this embodiment, when the compressor inlet pressure sensor 6 detects that the pressure at the inlet of the coal-locked gas compressor 4 is too low, the controller 9 opens the pressure regulating valve 10, and directly puts the gas coming out of the low-pressure wet spiral gas holder 2 at the inlet of the coal-locked gas compressor 4, so that the compressor inlet pressure can be adjusted to close to 3.5 kPa, and the pressure of the coal-locked gas compressor 4 can be increased, which can alleviate the waste of effective gas caused by opening the exhaust valve 11 due to the excessively high liquid level of the low-pressure wet spiral gas holder 2. At the same time, in order to further prevent the effective gas from being discharged to the flare, this embodiment can also open the conversion valve 13 to send the excess coal-locked gas into the conversion device 5, and realize the effective utilization of the exhaust gas through conversion hydrogen production, thereby achieving the effect of energy saving and emission reduction.

[0031] Before the application of this embodiment, the enterprise needs to vent the low-pressure wet spiral gas holder 2 twice a day; after the application of this embodiment, part of the coal lock gas returns to the coal lock 1 for stamping, and the excess can be used for the conversion device 5 without being discharged to the torch. According to the current production scale of the enterprise, the raw coal gas vented each time the gas holder is about 1599Nm 3， This is equivalent to about 0.48 tons of liquid nitrogen per time. The system runs 300 days per year. The market price of one ton of liquid nitrogen is 3,000 yuan. The application of this embodiment can save the company about 0.48*2*300*3000=864,000 yuan per year.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal-locked air compressor energy-saving system, characterized in that: It includes coal lock, low-pressure wet spiral gas holder, export water seal tank, coal lock gas compressor, gasifier and conversion device; The discharge port of the coal lock is connected with the feed port of the gasifier, and the raw coal gas outlet of the gasifier is connected with the raw coal gas inlet of the conversion device through a pipeline; the pressure relief port of the coal lock is connected with the air inlet of the low-pressure wet spiral gas holder through a pipeline, and the air outlet of the low-pressure wet spiral gas holder is divided into two paths, one of which is connected with the air inlet of the outlet water seal tank through a pipeline, and the other path and the air outlet of the outlet water seal tank are both connected with the air inlet of the coal lock gas compressor through a pipeline; The gas outlet of the coal lock gas compressor is divided into two paths, one of which is connected to the charging port of the coal lock through a pipeline, and the other is connected to the raw coal gas inlet of the conversion device through a pipeline; A compressor inlet pressure sensor is provided at the inlet of the coal-locked gas compressor, and a pressure regulating valve is provided on the pipeline connecting the low-pressure wet spiral gas holder and the coal-locked gas compressor; The signal output end of the compressor inlet pressure sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the pressure regulating valve.

2. A coal-locked air compressor energy-saving system according to claim 1, characterized in that: A liquid level sensor is provided in the low-pressure wet spiral gas holder, and an exhaust valve is provided at the exhaust port of the low-pressure wet spiral gas holder; The signal output end of the liquid level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the exhaust valve.

3. A coal-locked air compressor energy-saving system according to claim 1, characterized in that: A coal lock pressure sensor is provided in the coal lock, a pressure charging valve is provided on the pipeline connecting the coal lock gas compressor and the coal lock, and a conversion valve is provided on the pipeline connecting the coal lock gas compressor and the conversion device; The signal output end of the coal lock pressure sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input ends of the charging valve and the conversion valve respectively.

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