JPS59128922A - Air-conditioning method of gas turbine power plant in desert - Google Patents

Abstract

PURPOSE:To aim at improvements in an operation environment, by blowing off cold air in a direction toward a smokestack from air outlets at both side walls of a building, through plural air outlets, while inhaling hot air back ventilation from a suction port neaby the floor surface. CONSTITUTION:An air conditioner 3 is installed outdoors, then cooling air is led into an air outlet 8 by way of a feed duct 4 and released inside a room. The air warmed up inside the room is taken into the air conditioner 3 and turns to feed air again after being mixed with the outside air. According to this method, air conditioning for a workspace of about 1-2m on the floor of a gas turbine room can be performed, and in combination with a natural draft effect in and around a smokestack, such exhaust 11 as in a fairly higher temperature than that of the outside air taken in is discharged out of a roof fan 6, thereby conducing to a reduction in air cooling load.

Description

[Detailed Description of the Invention] Field of Application of the Invention The present invention relates to a gas turbine power plant, and in particular is used as a peak load power plant installed in a desert environment where severe heat and dirt or sand storms are dominant. The present invention relates to a gas turbine power plant suitable for

[Prior Art] Conventional desert gas turbine power plants are constructed as a so-called gas turbine package, in which the gas turbine and generator main body are assembled and fixed on a mechanical platform, and surrounded by a box-shaped weatherproof enclosure. There is an outdoor packaged gas turbine system that is delivered to the site, installed, and operated outdoors, and a run shade system that has a roof to protect it from the sun and has no side walls, but it is difficult to operate under intense heat and sandstorm environments. In all cases, the working environment for the operators and size-maintainers and the operating environment for the machines were not favorable.

Compared with the air-conditioning technology of the general residential room, the problems of the gas turbine W4 technology are as follows: Airflow within the zone is therefore much wider and higher.

The change in temperature distribution is large. Efficient air conditioning that takes all of these into consideration is necessary.

(11) The main cooling heat load is not a gradual one that invades from the outside world, but a gentle one that is caused by internally generated heat from the gas turbine. Furthermore, in the case of a peak-load power plant, when the gas turbine starts operating, the cooling load increases rapidly, and conversely, when the gas turbine stops, the cooling load suddenly disappears in a closed room.Then, the load changes. It's thick inside. Furthermore, it is difficult to control the operation of the cooling system because it is impossible to predict when the cooling duty cycle will reach its peak and when it will disappear.

0++) Since the gas turbine, whose combustion temperature exceeds 1000C'i, is the main heat source, if the air conditioning stops, the temperature in the gas turbine room will rapidly drop and rise, which may damage the indoor equipment.
On the other hand, if it gets too cold, there is a risk of condensation inside electrical equipment and accidents, so a cooling system with excellent load response that improves operational reliability is required.

(IXl) Industrial level or operation and maintenance in desert areas”
A system configuration using standard equipment that matches the after-sales service system is required.

[Purpose of the invention]

The purpose of the present invention is to comprehensively optimize the residual waste, exhaust heat/air conditioning system, and lay-over structure for a gas turbine unit for desert areas, and to create a cylindrical gas turbine that is efficient and has operational fs reliability. The purpose is to provide a heat exhaust system and a residual urine cooling system.

[Summary of the invention]

The present inventor conducted detailed analyzes and experiments on the cooling load cycle of a sealed residual air conditioner with a volume of cubic meters and a built-in nine turbines, including the indoor airflow and temperature distribution. Performance of standard refrigerators and air conditioners,
Based on our experience with operational control characteristics and operational reliability, the following He invented a power plant with a power plant and an air conditioning system.

(1) The main cooling load is caused by the heat generated by residual urine internal equipment that is radiated into the interior of the gas turbine from the outer surface of the enclosure of the NOI turbine unit and the outer surface of the exhaust gas chimney.

The amount of heat dissipated from the gas turbine is suppressed, and the upper and lower limits of the gas turbine room temperature are set to vary from the maximum cooling load when the gas turbine is operating at its peak load to the minimum cooling load when the gas turbine is stopped. The load fluctuation range up to this point was made to be within the capacity adjustment range of the standard teller.

This also made it possible to use a group of standard chillers as refrigerators.

(11) The layout of the gas turbine and exhaust gas stack in the gas turbine house space, the outlet for cold air supply from the air conditioner to the gas turbine room, and the position of the hot air return air intake;
The blowing direction and speed and the position of the roof 7'T of the residual urine,
The air flow or temperature distribution in the working space near the gas turbine chamber floor varies greatly depending on the outside air introduction and exhaust routes.

According to the present invention, comfortable cooling of a work space can be realized efficiently and economically. Additionally, it is possible to create a compact power plant that minimizes the amount of cooling equipment required.

(Child water is supplied by an air conditioner with a factor of It is easy to use, and redundant threads can be provided to increase the reliability of the system.

In addition, the heat capacity t of the chilled water system is concentrated, and the temperature change of the circulating chilled water, which is a basic control variable for system operation control, is made gentler and stable control can be performed.

(1) The prerequisite for a standard chiller to maintain normal refrigeration cycle operation is to first prevent the circulating cold water from freezing by setting the chilled water temperature on the outlet side of the teller to a few degrees Celsius or more, and then increase the water temperature by a few dozen degrees centigrade. The purpose is to suppress the pressure of refrigerant sludge to a certain value or less by maintaining the pressure below.

(■) Air-cooled refrigeration using a reciprocating compressor 4
As a method of controlling the capacity of the chiller, a chilled water thermostat is installed to detect the chilled water temperature at the outlet side of the chiller.
100 → 75% freezing capacity, 75 → 50 circles at 7C, 6
At C, compress 50 → 2596 and completely stop when the unrolled fin is below 50.

On the other hand, when the chilled water temperature tends to rise, for example, with a switching temperature difference of about 4C or an operating gap, the compressor can be started at 25% capacity at 9C, 25-50% at 10C, and 5° → 75 at 11C. %, 121:T75-+100% and onload in stages. Basically, if we use the chiller capacity control method, the prerequisite for (1■)? At the same time, the capacity can be adjusted according to the cooling load cycle.

(■1) In order for the above standard chiller to operate stably,
In response to changing cooling duty cycles, the compressor must be activated several times or less per hour during the refrigeration capacity adjustment process.

Otherwise, controlling the start and stop of the refrigerator without the refrigeration cycle being established will lead to serious failure or tripping of the compressor.

(Whether or not the condition of the VlllV1 term can be maintained is determined by the time constant of the entire cooling system and the capacity control method, especially the magnitude of the switching temperature difference of the (V) term.

(Vll+) In an example of a 200 MW class gas turbine power plant in a desert area based on the system configuration and raid structure of the present invention, the
OM from 0MW peak load operation to morning outside temperature of approximately 35C
W Under gas turbine power generation cycle conditions where minimum load operation is repeated every day, the power plant cooling system or chiller can reliably maintain the gas turbine room temperature at 't-4011' without starting or stopping, which is a problem even if automatic continuous operation is performed throughout the summer. Below,
Moreover, it can be controlled to a minimum of about 25C or more.

[Embodiments of the invention]

The present invention will be explained based on FIGS. 1 to 4.

In FIG. 1, a gas turbine unit 1 is supplied with working air 1. It is supplied to the inside of the gas turbine inlet casing, and further compressed in the machine to generate 10
After being heated to a combustion temperature exceeding 000 ce and performing work in the gas turbine, it becomes exhaust gas 12 of several 100 C and is discharged outdoors through a chimney of 5 tons. The gas turbine unit 1μ is composed of a so-called enclosure that surrounds the gas turbine machine body, its machine base, and the entire gas turbine casing with a box-shaped heat insulating panel. To eliminate primary heat dissipation from the gas turbine casing,
Although not shown, a forced once-through cooling loop is provided that forcibly introduces filtered outside air into the enclosure, cools it, and then discharges it outdoors. Appropriate heat insulation is installed on the gas turbine unit enclosure, exhaust gas duct chimney, and forced once-through cooling system surfaces to suppress the secondary heat radiated into the gas turbine room through them.

This amount of heat is the main internally generated heat source in the residual urine and accounts for most of the cooling load in the Rossi gas turbine room. In addition, in order to eliminate the total cooling heat load, including heat input from the outdoors through residual urine and heat input due to the introduction of all fresh outside air, there is a
Alternatively, the air conditioner 3 shown in FIG. 2 is provided. The view cooled by the air conditioner coil 27 is transferred to the air supply tact 4 by the blower 26.
After a period of time, the residual urine is introduced into the Suita outlet 8 or the air conditioner pro 126, where it is cooled and discharged into the room.

The blown airflow 13 approaches the final velocity along the trajectory shown schematically.

The air heated in the gas turbine room is sucked into the air conditioner 27 through the mechanical suction lower as υ warm return air, and a fixed amount of outside air 29 is drawn into the air conditioner 27.
The air is mixed with the air and cooled by the coil 27 to become supply air. 1st
As shown in the figure, the location of the suction port does not necessarily have to be on the floor.

The airflow and temperature distribution in the gas turbine room and work space up to 1 to 2 meters above the floor can be air-conditioned locally, centrally, and efficiently depending on the layout structure of the entire gas turbine room and room air conditioning system of the present invention. Can be cooled.

Coupled with the natural draft effect around the chimney, exhaust gas 11 with a temperature even higher than the outside air temperature 10 is discharged from the roof fan/6 of the roof.

This helps reduce the cooling load.

In order to supply chilled water 36 to all the plurality of regulator groups 27, a plurality of standard air-cooled chillers 31 or refrigerators are provided. The components of the air-cooled chiller are a reciprocating compressor 32 and a condenser 3
3, #bulge valve 30. These include an evaporator or chiller 31, a refrigerant circuit 34, and the like. The source of cold and heat is outside air 29.

A constant flow of circulating hot water whose temperature has increased by absorbing heat in the air conditioner coil is pressurized by the cold water pump group 35, flows into the evaporator or chiller 31 of the parallel chiller group, and is cooled by the refrigerant to become cold water 36. The compressor 32 that cycles refrigerant has a plurality of cylinders, and conceptually, by loading or unloading some of them, the amount of refrigerant circulation, and therefore the refrigerating capacity, can be increased to 100%.
It can be adjusted in several steps such as %, 50%, and 25X.

Although not shown, there is a means to completely bypass the cold water 36 and return it to the cold water pump suction side immediately before entering the air conditioner 27 when it is detected that the temperature of the gas turbine has fallen below a certain seasonal temperature. be done.

FIG. 4 is a flowchart or explanatory diagram showing the main parameters of this cooling system and its process characteristics such as heat flow, heat capacity, and dead time. In the figure, t is the temperature of the chilled water system, T is the temperature of the air system, V is the heat capacity of the system, gw, and GA is the mass flow rate of water and air, C'w.

CA is the specific heat of water and air, T/2 is the waste time and q
The heat flow is 7J<. Δ indicates the deviation m from the equilibrium state.

Under normal operating conditions, circulating cold water or air flow rate gw, GA
Keep it in one pair. At equilibrium, room temperature T RA % cold water temperature t,. When t, cooling load q0°. l Air conditioner load q
Between A Hu % chiller capacity QCLR / Yqeo
o+=qAFEu=qcr, n holds true. If the input of cooling load Δqeael into the gas turbine room is rare, ΔTRA will increase, and (ΔTRmu ΔtAIHIJ
In proportion to Ij or (ΔTRA-Δ1...t), Δq
-〇 increases, A thus increases the temperature level of the cold water heat container, and therefore the cold water outlet temperature increases by Δt0°. The chiller's body thermostat controls this temperature level, e.g.
t,,t=it:', the capacity controller 37 changes the valley Jt of the teller 31 by one step, for example, ΔQcta=25.
Increase by the amount of light. Furthermore, if the temperature level increases by IC, ΔQc L Rf will be increased by one more step. If the temperature level 1out tends to decrease after this, the switching temperature difference of several C or the operation gap will be increased. from,
Reduce the capacity by ΔqcLR"" -25%. If the t6ut level continues to drop by 11c, 1qCLR gold will be added to
Narrow down in stages. Thus, Δqo0゜l−ΔqAiU:Δ(
The capacity controller 37 of the chiller automatically repeats the control operation to find the equilibrium point of tc'LR.

As mentioned above, when the gas turbine room temperature falls below the lower limit, the system is bypassed immediately before all the cold water supply inlets to the air conditioner. In this case, the chiller cools the cold water until it reaches the lower limit of the cold water temperature and then stops.

In addition, in the figure, 2 is a closed building, 38 is a cold water temperature detector, 1
6 is an air outlet, 17 is a return air flow, and 28 is an outside air intake facility.

According to this embodiment, the chilled water temperature tou (as described above) at the chiller outlet during the cooling duty cycle ranges from several C to several tens of C.
The low temperature level corresponds to a low load, and the commercial temperature level corresponds to a cylinder load. Conceptually, at the Heikyo point, the gas turbine room temperature and the temperature if (TRA 'eat) are the cooling load q8°. It is proportional to l.

[Effects of the Invention] According to the present invention, when a switching temperature difference of several C is provided as in the capacity adjustment method, the start/stop frequency of the chiller determined from the heat capacity of the entire cooling system and the chiller capacity adjustment method becomes below the allowable value. This enables highly reliable automatic driving control.

[Brief explanation of the drawing]

Fig. 1 is an elevational view showing the layout structure of the Kasturbine power plant of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a system diagram of the air conditioning and cooling system of the invention, and Fig. 4 is It is a flowchart of operation control of the air conditioning system of the present invention. 1...Gaster (room), 3...Air conditioner, 31...
Teller, 37... Capacity controller, 38... Cold water temperature expansion detector. Agent Patent Attorney Akira Shimahashi 1β \--/ House 1 Figure 1 7

Claims (1)

[Scope of Claims] 1. In a Kasturbine power plant having a plurality of packaged gas turbine generator units as main elements, the gas turbine exhaust gas is discharged outdoors from chimneys arranged through the metal construction house, and the Ogasturbine machine The primary heat radiation from the casing into the unit enclosure is discharged outdoors by a primary forced once-through cooling loop using outside air as the refrigerant, and the secondary radiation radiated into the cast turbine room through the panel surface of the enclosure, etc. heat amount or cooling load,
Using multiple air conditioners, blow out cold air horizontally from multiple air conditioners on the inside wall of the house toward the chimney, and suck in hot return air from the inlet near the floor. Features an air conditioning method for gas turbine power plants in the desert. 2. In claim 1, the refrigerator group further includes:
A plurality of wall-painted chillers that perform a reciprocating refrigeration cycle are used in parallel, and a chilled water thermostat attached to each chiller detects the chilled water outlet temperature level and controls the chiller according to the capacity control method. Refrigeration capacity is adjusted in number steps to maintain the outlet temperature of the chiller of the circulating cold water throughout the cooling duty cycle within the range of several C to several C, and to maintain the maximum temperature of the gas turbine room at the peak load at a predetermined level. and the lower limit rtii'i of the temperature of the gas turbine chamber is set below this temperature,
% of the total amount of cold water supply to the air conditioner group
Air conditioning method for a gas turbine power plant in the desert.