Installation for cooling a natural gas compressor stations of main gas pipeline

 

(57) Abstract:

For cooling gas flow applied heat pump, which is provided with an additional evaporator, installed on the pipeline before the supercharger pumping unit, and an additional choke in front of the additional evaporator in the direction of the refrigerant at the entrance of the compressor of the heat pump is connected to both the evaporator and the outlet and inlet tube space of the condenser of the heat pump is connected with the consumer of thermal energy. On the pipeline after each evaporator refrigerant installed temperature sensors whose outputs are connected to the control device, and the outputs of the latter are connected with actuators control valves of the heat pump for automatic temperature control of gas flow. The use of a heat pump with two evaporators of the refrigerant in the chiller natural gas with automatic regulation of the amount taken from the gas stream heat input and at the output of the supercharger compressor units can reduce the power consumed in compressing the gas, and a connection pipe of different energy resources. 1 Il.

The invention relates to refrigeration and can be used for transportation of natural gas through main gas pipelines.

Known devices for cooling natural gas containing sequentially connected to the gas line after the gas compressor unit air cooler and the evaporator of the refrigeration machine [1].

The lack of such facilities is that in winter, when the gas has a low temperature, excessive cooling of the gas stream can lead to the destruction of the metal pipe.

The closest technical solution, selected as a prototype, is the setting for cooling natural gas [2], containing sequentially connected to the gas main compressor, air cooler and the evaporator of the refrigerating machine equipped with a cooled condenser, which is to improve operational reliability of the main gas pipeline is made of two sections, and one of its sections is connected to the gas line before the compressor to heat the gas flow in the winter.

However, using this setting affects the energy performance is>C increases power consumption to a contraction of 0.6%.

The purpose of the invention is the reduction of unit energy costs for the transportation of gas.

This goal is achieved by the fact that cooling of the gas stream used heat pump [3], which is provided with an additional evaporator mounted on the pipe before the compressor gas compressor unit (GCU), and an additional choke in front of the additional evaporator in the direction of the refrigerant at the entrance of the compressor of the heat pump is connected to both the evaporator and the outlet and inlet tube space of the condenser of the heat pump is connected with the consumer of thermal energy. On the pipeline after each evaporator refrigerant install temperature sensors whose outputs are connected to the control device, and outputs the latter is connected with actuating mechanisms regulating valves heat pump for automatic temperature control of gas flow.

Comparative analysis of the proposed technical solution with the prototype shows that the use of a heat pump with two evaporators of the refrigerant in the plant for cooling is the amount taken from the gas stream heat input, and at the exit of the compressor gas compressor unit allows to reduce the power consumed HPA, and a connection pipe space of the condenser of the heat pump with the consumer of thermal energy provides the utilization of secondary energy resources.

The drawing shows a block diagram of the installation for cooling a natural gas compressor station gas pipeline.

The diagram shows the heat pump TONS, gas-pumping unit GPA, a linear section of the main pipeline G and the receiver thermal energy PTE.

Heat pump VT contains:

two evaporator refrigerant 1 and 2, tubular space which passes the gas stream (teplootdachi);

two circuits I and II of the refrigerant, consisting of a compressor 2 driven adjustable motor M, the input of which is connected to the annular space of the refrigerant evaporators 1 and 7, and the output from the annular space of the condenser 3, hadproved 4, control valves 5 and 8, driven actuators 6 and 9, respectively.

Tube space of the condenser 3 TON heat pump, which circulates the heat sink, industrial evaporator refrigerant 1 installed on the pipeline gas temperature sensor DT, and on the pipeline downstream of the evaporator refrigerant 7 - gas temperature sensor T, the outputs of which are connected respectively with the first and second inputs of the control unit CU. The third and fourth inputs of the unit SU is connected respectively Adjuster gas temperature to T01and after T02its compression. The outputs of the control unit CU is connected with the actuators 6 and 9 control valves 5 and 8 are installed on hadproved 4 respectively in the first and second paths of circulation of the refrigerant.

The device operates as follows.

The flow of gas of high temperature is supplied into the tube space of the evaporator refrigerant 1 and further to the input of the supercharger pumping unit GPA, and after compression, through the tube space of the evaporator refrigerant 7, in a linear pipeline portion, the annulus evaporators 1 and 7 is fed to the refrigerant, which under the action of gas flow temperature (caloosahatchie) boils, and its fumes are sucked by the compressor 2 at the same time from both evaporators, thus constantly maintained low pressure and hence low temperature. Compressed by the compressor 2 pairs of refrigerant to magnetoelectronics and the heat pipe 10 of the receiver thermal energy PTE, resulting condensed. From the condenser 3, the liquid refrigerant flows into the circuits I and II of the refrigerant, and passing control valves 5 and 8, enters the annulus of refrigerant evaporators 1 and 7 TON heat pump. Then work the cycle repeats.

Sensor DT measure the temperature of the flow of the cooled gas before compression. The signal from DC fed to the input of the control unit CU, where it is compared with a predetermined setpoint temperature T01. When the temperature changes of the gas stream at the inlet of the compressor station, you receive the difference (the error) temperature T1according to which device the SU generates a control signal actuating mechanism 6 of the valve 5 for regulating (by throttling the flow of refrigerant in the first circuit VT, resulting in stabilizing the temperature of the gas stream at a given level before compression.

Sensor DT measure the temperature of the gas stream after compression and cooling in the beginning of the linear parts of main gas pipeline, the Signal from the sensor D is supplied to the second input of the control unit CU, where it is compared with a predetermined setpoint temperature T02. If the gas consumption has SU generates a control signal actuating mechanism 9 of the valve 8 for controlling the flow of refrigerant in the second circuit TN, resulting stabilize the temperature of the gas stream at the specified level after compression.

Adjusting simultaneously thus the refrigerant flow in both circuits, TN, change the number of selected heat from the gas stream, which, transformed, transmitted to the heat sink and then flows through the heat pipe 10 to the consumer of thermal energy PTE.

The use of the proposed installation for cooling a natural gas compressor stations of main gas pipeline allows you to reduce power consumption on its compression and, in contrast to known devices, enables the utilization of secondary energy resources in full, which leads to an overall reduction of specific energy consumption for the transport of gas. In addition, using this installation eliminates the destruction of metal piping from cold it is in winter, which increases the operational reliability of the gas pipeline.

Sources of information

1. USSR author's certificate N 383974, F 25 D 25/00, 1973.

2. USSR author's certificate N 545819, F 16 L 53/00, 1977.

3. Polytechnical dictionary/ CH. Ed. by Acad. A. Y. Mechanics. - P 50 2nd ed. - M.: Soviet encyclopedia, 1980, S. 519.6


 

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