RU2583208C1 - System of heating fuel gas in compressor shop - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to heat engineering and can be used in gas transport industry, specifically in heating systems of fuel gas. Fuel gas heating system includes fuel gas heater, in which tube bundle for fuel gas is immersed into solution of intermediate heat carrier contained in tank, which is installed inside fuel gas heater. Inserted into tank, there are connected to house-tube heat exchanger inlet and outlet pipelines of intermediate heat carrier, so that all said pipes of intermediate heat carrier, house-tube heat exchanger, and tank form a single circulation circuit of intermediate heat carrier. To house-tube heat exchanger feed and discharge pipelines are connected for heat-extraction water. Feed or discharge pipeline of intermediate heat carrier is equipped with electric pump connected to frequency converter, automatically changing pump RPM depending on signals coming from temperature sensors.

EFFECT: technical result is reduction of power consumption due to usage of secondary low-potential energy sourse as heat-extraction water.

4 cl, 1 dwg, 1 tbl

Description

The invention relates to equipment used in the transport of gas through gas pipelines, and can be used in the gas transportation industry to upgrade fuel gas heating systems or to equip them with stationary gas pumping units (hereinafter - GPU) with a gas turbine drive installed in compressor shops (hereinafter - CC) ) compressor stations (hereinafter - CS) of gas pipelines.

The invention can also be used in the field of gas turbine engineering in the manufacture of new gas turbine units with a gas turbine drive.

A known fuel gas heating system comprising at least one electric gas heater, made in the form of tubular thermoelectric heating elements placed inside a flow tank, equipped with sensors for temperature control, sensors for protection against overheating and containing external thermal insulation (see RF patent for useful model No. 78896, publ. 10.12.2008).

A disadvantage of the known system is the high energy consumption spent on heating the gas. For example, to heat fuel gas per GPU, an electric heater with a power of 10 to 150 kW is required, while the power consumption increases with increasing power of the GPU, and since GPUs operate, as a rule, in a constant mode, the energy consumption will be constant rather than periodic. Considering that the number of gas-compressor units depending on the compressor station can be from 2 to 20, in order to ensure such a number of consumers, there is a need to build parallel to the main gas pipeline system of power lines or additional gas turbine power plants using natural gas as fuel. Thus, the use of electric heating for fuel gas is acceptable for low-power gas compressor units, and in the case of electric heating for high-power gas units, there is a significant increase in the cost of transporting natural gas.

Known fuel gas heating system, comprising at least one gas-oil gas heater, made in the form of a shell-and-tube or plate heat exchanger having an intermediate cavity between the cavities of natural gas and oil. This system may include two mutually redundant shell-and-tube tube-type gas-oil heaters, each of which contains double tubes composed of an inner tube, an outer tube and having a gap between the outer and inner tubes, provided by grooves on the outer or inner tube, while gas flows through the inner tube in the tube space, the oil passes in the annulus and is in contact with the outer tube, the intermediate cavity is filled with an inert gas, the intermediate coolant m either has an exit to the candle. This system may also include two mutually redundant plate gas-oil heaters, each of which contains a natural gas cavity - high pressure, oil cavity - low pressure, an intermediate cavity filled with an inert intermediate coolant or having a candle (see RF patent for utility model No. 92934, published April 10, 2010).

The disadvantage of this system is that the heating of the fuel gas is possible only after warming up the oil on the launched GPU. This, in turn, leads to the fact that the start-up of the gas compressor unit and its heating is possible only with cold fuel gas, which greatly complicates the start-up of the gas unit at low ambient temperatures, increases the risk of condensation in the gas valve of the gas unit and the failure of the fuel supply system.

Known adopted as a prototype is a fuel gas heating system comprising a gas heater made in the form of a two-phase thermosiphon heat exchanger, in which a tube bundle of high pressure gas (fuel gas) is immersed in a diethylene glycol solution, and a package of thermosiphon tubes with evaporation zones is installed in the partition wall of the heater body. and condensation, the evaporation zone being connected to the hot water system. To heat the gas, hot water flows from the existing hot water supply system KS through the pipe into the lower part of the thermosiphon heater body, which, in turn, is heated in exhaust heat exchangers of a gas turbine installation. Using a package of thermosiphon tubes, the solution of diethylene glycol located in the upper part of the heater’s body is heated by the heat of hot water, through which heat is transferred to gas passing through the tube bundle (see RF patent for utility model No. 57421, publ. 10.10.2006).

The disadvantages of this system are the complexity of installation and maintenance of thermosyphon tubes, the inability to control the process of controlling the temperature of the fuel gas.

The objective of the claimed invention is the creation of a heating system for fuel gas, leveling these disadvantages of analogues and prototype.

The technical result achieved by the application of the claimed invention is to reduce energy costs through the use of a secondary source of low potential energy - heating water heated in the heat recovery units of the GPA exhaust gas from the compressor shop, and the rejection of burning natural gas, which, in turn, improves the environment by reducing emissions of natural gas combustion products into the atmosphere.

The problem and the technical result indicated in a fuel gas heating system comprising a fuel gas heater, in which a tube bundle of fuel gas is immersed in an intermediate coolant solution, are respectively solved and achieved by the fact that the intermediate coolant solution is contained in a tank installed inside the fuel gas heater through the fuel gas heater body is introduced into the tank through one of its side walls equipped with shutoff valves and connected to the shell and tube to the heat exchanger, the inlet and outlet pipelines of the intermediate heat carrier in such a way that all of the indicated pipelines of the intermediate heat carrier, the shell-and-tube heat exchanger, and the tank form a single circuit for the circulation of the intermediate heat carrier, while the inlet and outlet pipelines of heating water heated in the heat exchanger equipped with shut-off valves are connected to the shell-and-tube heat exchanger GPA gases, and the inlet or outlet pipe of the intermediate coolant supplies en electric pump, which is connected with a frequency converter, automatically altering the rate of rotation of the electric pump based on the proportional-integral-differential control law on the signals coming from temperature sensors installed with the possibility of fixing the fuel gas temperature and the intermediate heating water coolant.

The task and the specified technical result in the fuel gas heating system are respectively solved and achieved by the fact that the inlet pipe of the intermediate coolant is introduced into the tank in its upper part, and the outlet pipe of the intermediate coolant is introduced into the tank in its lower part.

The task and the specified technical result in the fuel gas heating system are respectively solved and achieved also by the fact that the outlet pipe of the intermediate coolant is introduced into the tank in its upper part, and the supply pipe of the intermediate coolant is introduced into the tank in its lower part.

The task and the specified technical result in the fuel gas heating system are respectively solved and achieved by the fact that a diethylene glycol solution is used as an intermediate heat carrier.

The claimed invention is illustrated by graphic materials, where the drawing schematically shows an example of a fuel gas heating system by which it is possible to implement the claimed invention in accordance with its purpose, where:

1 - discharge pipe of heating water;

2 - shell-and-tube heat exchanger;

3 - electric pump;

4 - discharge pipe of the intermediate coolant;

5 - exhaust pipe of the fuel gas;

6 - capacity;

7 - a tube bundle of fuel gas;

8 - a solution of an intermediate coolant;

9 - fuel gas supply pipe;

10 - frequency converter;

11 - inlet pipe of the intermediate coolant;

12 - supply pipe of heating water.

In this case, the tube bundle of fuel gas 7 is immersed in a solution of the intermediate coolant 8 contained in the tank 6 installed inside the fuel gas heater (not conventionally marked in the drawing).

Through the housing of the fuel gas heater, into the tank 6 through one of its side walls are introduced shut-off valves (in the drawing, shut-off valves are shown, but not conditionally marked) and connected to the shell-and-tube heat exchanger 2 inlet 11 and outlet 4 of the intermediate coolant pipe in such a way that all of the above pipelines of the intermediate coolant, shell-and-tube heat exchanger 2 and capacity 6 form a single circuit for the circulation of the intermediate coolant.

Connected to the shell-and-tube heat exchanger 2 are those equipped with shut-off valves (shut-off valves are shown in the drawing, but are not conditionally marked) inlet 12 and outlet 1 of heating water pipelines heated in heat exchanger heat exhaust gas heat exchangers (not shown).

The inlet 11 supply pipe or 4 outlet pipe is equipped with an electric pump 3, which is connected to a frequency converter 10, which automatically changes the rotational speed of the electric pump 3 based on the proportional-integral-differential law of regulation by signals from temperature sensors (not shown in the drawing) installed with the possibility of fixing the temperatures of fuel gas, heating water and an intermediate coolant.

The fuel gas temperature sensors are installed on the exhaust 5 and / or supply 9 fuel gas pipelines 5.

The temperature sensors of the heating water are installed on the outlet 1 and / or supply 12 pipelines of the heating water.

The temperature sensors of the intermediate coolant are installed on the outlet 4 and / or inlet 11 pipelines of the intermediate coolant.

In the most preferred embodiment of the claimed invention, the inlet pipe of the intermediate coolant 11 is introduced into the tank 6 in its upper part, and the outlet pipe of the intermediate coolant 4 is equipped with an electric pump 3 and introduced into the tank in its lower part.

This implementation option is due to better mixing of the intermediate coolant in the tank 6.

In the embodiment of the claimed invention, shown in the drawing, the discharge pipe of the intermediate coolant 4 is introduced into the tank 6 in its upper part, and the supply pipe of the intermediate coolant 11 is equipped with an electric pump 3 and introduced into the tank 6 in its lower part.

In this case, a diethylene glycol solution is used as an intermediate heat carrier.

The fuel gas heating system operates as follows (see drawing).

Cold fuel gas enters through a fuel gas supply pipe 9 into a pipe bundle of fuel gas 7 immersed in a solution of an intermediate heat carrier 8, for example, diethylene glycol contained in a tank 6, where it is heated to the temperature of the heat carrier.

The circulation of the intermediate coolant between the shell-and-tube heat exchanger 2, the supply 11 and the outlet 4 pipelines of the intermediate coolant and the capacity 6 is provided by the electric pump 3 installed on one of these pipelines of the intermediate coolant.

The frequency of rotation of the electric pump 3 and, as a result, the temperature of the fuel gas moving along the exhaust gas pipe 5, are automatically controlled using a frequency converter 10 connected to the electric pump 3 and operating on the basis of the proportional-integral-differential law of regulation by signals from temperature sensors fuel gas installed on the outlet 5 and / or supply 9 pipelines of fuel gas 5, temperature sensors of heating water installed on leading 1 and / or the supply lines 12 of the heating water, as well as intermediate coolant temperature sensors 4 mounted on the offtake and / or the supply ducts 11 of the intermediate heat transfer medium.

In this case, the intermediate coolant is heated in a shell-and-tube heat exchanger 2 by means of heating water heated in GPU exhaust heat heat exchangers of the compressor shop and supplied to the shell-and-tube heat exchanger 2 through the heating water supply pipe 12 and the compressor heat pump heating station removed from it to the heating system of the compressor station through the water discharge pipe one.

The calculations (see the table of results) performed for KTs-1 KS-1 of the Vyngapurovsky Line-Field Management of gas mains of Gazprom transgaz Surgut LLC, which includes 5 GPA16MG90.04 with DG90L2 gas turbine engines, showed that the use of a fuel gas heating system made using the claimed invention, will completely abandon the combustion of natural gas in order to heat the fuel gas and thereby reduce emissions of natural gas combustion products into the atmosphere.

Claims (4)

1. A fuel gas heating system comprising a fuel gas heater, in which a tube bundle of fuel gas is immersed in an intermediate coolant solution, characterized in that the intermediate coolant solution is contained in a tank installed inside the fuel gas heater through the fuel gas heater body into a tank through one from its side walls, the inlet and outlet pipelines of the intermediate heat carrier, equipped with shutoff valves and connected to the shell-and-tube heat exchanger, are introduced in such a way that all of these intermediate heat transfer pipelines, a shell-and-tube heat exchanger and a tank form a single intermediate coolant circulation circuit, while the supply and exhaust pipelines of heating water heated in heat exchangers of exhaust gases of a gas-pumping unit are connected to the shell-and-tube heat exchanger the outlet pipe of the intermediate coolant is equipped with an electric pump, which is connected to the frequency converter a developer that automatically changes the frequency of rotation of the electric pump based on the proportional-integral-differential law of regulation according to signals received from temperature sensors installed with the possibility of fixing the temperatures of fuel gas, heating water and an intermediate coolant. 2. The system according to claim 1, characterized in that the inlet pipe of the intermediate coolant is introduced into the tank in its upper part, and the outlet pipe of the intermediate coolant is introduced into the tank in its lower part. 3. The system according to p. 1, characterized in that the outlet pipe of the intermediate fluid is introduced into the tank in its upper part, and the supply pipe of the intermediate fluid is introduced into the tank in its lower part. 4. The system according to claim 1, characterized in that a diethylene glycol solution is used as an intermediate heat carrier.

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