RU2753094C1 - Method for heating supply ventilation air - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to the field of gas industry and can be used in a system for heating the air entering the supply ventilation of an individual shelter or other facilities with installed gas pumping aggregates (GPA) or other technological apparatuses with gas turbine drives (GTD) with cycle air discharge. The technical result is achieved in direct heating of the supply air by the heat discharged with the blowoff air of the air-to-air heat exchanger (AAHE), by mounting an air gas modular duct from the AAHE to the aggregate, containing a two-position air valve, a frequency controlled fan, a pressure measurement sensor and by integrating a linear algorithm for maintaining the temperature of the measured air into the automatic control system by changing the amount of warm air supplied from the AAHE by means of changing the fan rate. The air discharged from the AAHE is pre-purified from mechanical impurities, traces of natural gas and combustion products are not present therein.

EFFECT: provided is direct heating of the supply air entering the individual shelter of the GPA by returning the air discharged from the GTD into the atmosphere via the air-to-air heat exchanger (AAHE) unit into the operating cycle.

1 cl, 2 dwg

Description

The invention relates to the field of the gas industry and can be used in a heating system for air entering the supply ventilation of an individual shelter or other rooms with installed gas pumping units (hereinafter referred to as GPU) or other technological devices with gas turbine drives (hereinafter referred to as GTE) having a cycle air discharge ...

In accordance with the technical requirements of the standard [1], three times air exchange per hour must be provided in the individual GPA shelters. The temperature of the supply air entering the individual shelter of the operating GPU must be maintained at a level not lower than + 15 ° С [2].

Known heating device for individual shelters GPA [3], consisting of a prefabricated box-type housing, fans, automatic control system, an air intake unit installed at the inlet, a heating unit and collectors. The disadvantage of this device is the method of maintaining the temperature in the individual shelter of the GPU, which provides for the combustion of natural gas and indirect heating of the supply air, as a result of which part of the heat and harmful substances formed during the combustion of gas are discharged into the atmosphere with the exhaust gases.

Known air heating system [4], consisting of an air intake shaft, fans, supply and exhaust air ducts, a mixing-type air heater installed in the supply air duct, an automatic fuel supply regulator. The disadvantages of this system are:

- emissions of harmful substances formed during the combustion of gas into the atmosphere;

- ingress of harmful substances formed during gas combustion into the working area;

- the possibility of natural gas entering the working area when the torch is extinguished.

Known device for supply ventilation with heating [5], consisting of an air intake pipe located in the wall of the building, and an air channel with a heating element placed inside it, located along the inner wall of the building, an intake grill, a muffler-dust collector, consisting of at least two concentric pipes made of soft porous material connected by two or more spiral inserts made of the same material, anemostat, automatic air vent and valve. The disadvantages of this device are:

- low efficiency due to the use of an intermediate heat carrier;

- the possibility of freezing of the coolant in the heat exchanger, followed by laborious defrosting.

The objective of the invention is to reduce emissions of harmful substances into the atmosphere, thermal pollution of the atmosphere and the amount of energy spent on heating the supply air entering the ventilation system of the individual shelter.

The technical result of the invention is to provide direct heating of the supply air entering the individual shelter of the gas compressor unit by returning the air discharged from the gas turbine engine into the atmosphere through the air-to-air heat exchanger unit (hereinafter referred to as BVVT).

The problem is solved, and the technical result is achieved in the direct heating of the supply air by the heat discharged with the purge air of the BVVT, by mounting from the BVVT to the air gas modular unit (hereinafter referred to as AVGM) air duct containing a two-position air valve, a frequency-controlled fan, a pressure measurement sensor and integration into the automatic control system (hereinafter - ACS) of the linear algorithm for maintaining the temperature of the measured air by changing the amount of warm air supplied from the BVVT by changing the fan speed. The air discharged from the BVVT is preliminarily cleaned from mechanical impurities, there are no traces of natural gas and combustion products in it.

The scheme for supplying the heat discharged with the blowing air of the BVVT into the ventilation system of the GPA individual shelter is shown in Fig. 1. The heat normally discharged from the gas turbine engine 17 with the purge air from the BVVT 1 through the installed air duct 2 is redirected to the air duct 5. The air duct 5 connects the BVVT 1 and the AVGM 6. To regulate the amount of heat entering the individual shelter of the GPA 9, an air valve is installed in the air duct 5 3 two-position and 4 frequency-controlled fan. Regulation of the amount of heat discharged with the purge air BVVT 1 is carried out by changing the frequency of rotation of the fan 4. The amount of heat supplied to the AVGM 6 from the BVVT 1 is directly proportional to the frequency of rotation of the fan 4. Complete overlap of the heat supply with the purge air BVVT 1 in the AVGM 6 is carried out closing the air valve 3. To supply the supply air to the individual shelter of the GPA 9 in the AVGM 6, atmospheric air is taken, purified, directly heated by the heat discharged with the purge air BVVT 1, and injection into the normally installed supply ventilation duct 7 with a fire valve 8. For temperature control (hereinafter - Ta) a resistance thermometer 10 is installed inside the individual shelter of the GPA, connected by measurement channel 11 with an automatic control system (hereinafter - ACS) 12. ACS 12 contains a controller, control channels 13 and 14 and a measurement channel 16 with a pressure measurement sensor 15 ACS 12 controls the position On-off air valve 3 through control channel 13 and fan speed 4 through control channel 14.

The algorithm for controlling the heating of an individual shelter when the GPU is running is shown in Fig. 2. Block 101 checks the state of the GPU. If the GPA is not in operation (block 102), the air valve 3 is closed and the power supply to the fan 4 is turned off.

1. If Ta> 16 ° C, the algorithm goes to block 104. Block 104 monitors Ta. If Ta <35 ° C, the algorithm goes to the PO block. If Ta> 35 ° C, the algorithm goes to block 107. According to block 107, a warning about high Ta is displayed at the operator's automated workstation (hereinafter - AWP). If Ta <35 ° C, the algorithm goes to the PO block.

2. If Ta <16 ° C, the algorithm goes to block 105. Block 105 determines the state of the AVGM 6. If the AVGM 6 is in operation, the algorithm goes to block 106. According to block 106, a warning about low Ta is displayed on the operator's workstation. If AVGM 6 is not in operation, AVGM 6 is started and controlled according to the standard algorithm. After starting AVGM 6 into operation, according to block 109, there is a 300 second delay and a transition to the software block. The software block monitors Ta. If Ta = 20 ° C, then the algorithm goes to block 113. If Ta = 20 ° C, frequency regulation of fan 4 is carried out according to the conditions prescribed in block 112. Block 112 monitors the rotation frequency of fan 4 to maintain Ta = 20, but not more than the rotation frequency providing Rizb = 0 Pa. Block 113 controls the rotational speed of fan 4 and the AVGM 6 being in operation. If the fan speed 4 is less than 50% of the maximum and AVGM 6 is in operation, the algorithm goes to block 114, where the AVGM 6 stops. If the conditions specified in block 113 are not executed, then after the end of the 60 second delay, according to block 115, the flow goes to block 101.

This scheme of air supply for blowing BVVT into AVGM has the greatest reliability due to the absence of the possibility of blocking the air discharged from the BVVT and the ability to level the excessive air intake from the BVVT through the standard air discharge duct from the BVVT connected to the atmosphere. If the control system fails and the temperature in the hangar reaches less than 16 ° C, the AVGM will start up and work according to the standard AVGM algorithm. If an excessive amount of heat is supplied from the BVVT, a warning will be displayed on the operator's workstation, the air damper will be manually closed and the power to the pressure fan will be disconnected. In the event of emergency situations requiring interruption of the supply air supply to the individual shelter of the gas compressor unit, this will be performed by the standard automation equipment of the AVGM.

The effect of the invention is manifested in the fact that during the operation of the GPU, the operating time of the AVGM burners is minimized.

The essential features of the invention are:

- reduction of economic costs associated with the cost of natural gas for heating;

- reducing the emission of harmful substances into the atmosphere;

- reducing the emission of thermal pollution into the atmosphere;

List of sources

1. WFD 39-1.8-055-2002. Typical technical requirements for the design of compressor stations, booster compressor stations and compressor stations of an UGS facility. - JSC "Gazprom", Moscow 2002.

2. Gas-pumping unit GPA-25M-02 "Ural". Manual. - JSC NPO Iskra, 2010.

3. RF patent for utility model No. 100196, F24H 3/00, 2010.

4. RF patent for invention No. 2230259, F24D 5/00, 2004.

5. RF patent for utility model No. 184580, F24F 7/00, 2018.

Claims (1)

The method of heating the supply ventilation air, which consists in direct heating of the supply air with the heat discharged with the purge air of the air-air heat exchanger block, by mounting from the air-air heat exchanger block to the air-gas modular air duct unit containing a two-position air valve, a frequency-controlled fan and a sensor pressure measurement, characterized in that the automatic control system controls the maintenance of the temperature of the measured air and controls the change in the amount of warm air supplied from the unit of air-air heat exchangers by changing the fan speed.

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