A mathematical model for investigating the processes in regenerator heat exchangers is described. A finite-difference scheme of numerical integration is proposed for solving the conjugate problem on unsteady heat exchange between one-dimensional flows and a two-dimensional matrix wall. The data of test calculations have been compared with the data of other authors. The quasistationary and dynamic processes in a gas-turbine plant regenerator with a matrix of gauzes have been investigated. The optimum design parameters of such a regenerator and rotor speeds providing a maximum heat efficiency of the regenerator at minimum aerodynamic drags in it have been determined.Introduction. Two types of regenerators -regenerators of continuous and periodic operation -have received the widest acceptance [1,2]. In a continuous-operation regenerator, a cylindrical or a drum matrix rotates relative to the inlet and outlet pipes with a constant speed, and heat-transfer agents flow through them continuously. A Ljungstro .. m regenerator with a rotating matrix and stationary branch pipes and a Rothemu .. hle regenerator with rotating

Thermal configurations for condensation, district heating, and discharge steam-gas systems (PGU) based on the GTÉ-65 gas turbine power unit are described. A comparative multivariant analysis of their thermodynamic efficiency is made. Based on some representative examples, it is shown that steam-gas systems with the GTÉ-65 and boiler-utilizer units can be effectively used and installed in existing main buildings during technical refitting of operating thermal electric power plants.

A mathematical model for investigating the processes in regenerative heat exchangers is described. A finitedifference scheme of numerical integration is proposed for solving the conjugate problem on unsteady heat exchange between one-dimensional flows and a two-dimensional matrix wall. Test calculations were compared with the known data of other authors. The quasi-stationary and dynamic processes in a gas-turbine plant regenerator with a matrix packed with gauzes have been investigated. The optimum design parameters of such a regenerator and rotational speeds of its rotor that which provide a maximum heat efficiency of the regenerator at a minimum aerodynamic drag in it have been determined.Introduction. In [1], we proposed a generalized, distributed, nonlinear mathematical model for investigating the processes in regenerators of continuous and periodic operation as well as a scheme of numerical integration and an algorithm for solving the conjugate problem on unsteady heat exchange between one-dimensional flows and a two-dimensional matrix wall and presented data of identification of the mathematical model proposed.In the present work, we briefly discuss the computational algorithm and program and propose methods for reducing the problem considered for matrices with various packings (which are widely used in practice) to the problem for matrices packed with spheres and straight channels. With the example of a gas-turbine plant regenerator with a matrix packed with gauzes, the quasi-stationary and dynamic heat processes and aerodynamic processes occurring in regenerative heat exchangers are considered in detail, and the design parameters of such a regenerator and the rotational speeds of its rotor that provide a maximum heat efficiency of the regenerator at a nonzero aerodynamic drag in it are calculated. Atmospheric pressure regenerators with other packings of their matrices were investigated in [2].Brief Description of the Computational Algorithm and Program. The program for calculating regenerators of continuous and periodic operation is based on the mathematical model and algorithm described in [1] and is written in terms of the FORTRAN language. The first version of this program was presented in [3]. The initial data for calculation are as follows: a) type of regenerator; design parameters of the matrix; duration of one cycle τ c ; total number of cycles (revolutions); relative areas occupied by gas ψ g , air ψ a , and packings ψ p in the matrix; amount of leakages in the packing; b) type, properties, and input parameters of the heat-transfer agents and directions of their flows; c) coordinate system for the heat-conduction equation; parameters of the numerical scheme; integration steps; d) service parameters used in the calculation. The matrices of regenerators are usually not symmetric relative to the flows in them and have circular or conditionally rectangular cross sections. They can be made with straight channels different in cross section or be packed with various bodies or gauzes.The program developed...

Thermal layouts are examined for condensation-type steam-gas systems with one, two, and three boiler-utilizer pressure stages based on the GTÉ-65 gas-turbine power generating system and the PT 60-12.7/1.27 steam turbine. The operational efficiency and feasibility of integrating a GTÉ-65 and a Pr-86-13.72-545 boiler-utilizer with a single pressure stage in the existing thermal layout of the TÉTs-9 plant of Mosénergo (a station with crosslinks) within the main housing at the location of a no longer operating R-50-12.7/1.27 steam turbine and PTVM-100 water heating boiler are demonstrated.Keywords: Heating and electric power plant with crosslinks, renovation, gas-turbine power generating system, steam-gas add-on, thermal layouts with one, two and three pressure stages in the boiler-utilizer, cycle thermodynamic efficiency.The Mosénergo TÉTs-9 plant [1] is typical of crosslinked heating and electric power stations in large Russian cities. It produces a combination of electrical and thermal energy with steam parameters of 12.7 MPa and 550 ºC and an installed power exceeding 250 MW. The major equipment in the renovated station consists of two TGM-84 power generating boilers and three BKZ-320 power generating boilers, as well as two PT 60-12.7/1.27 and one PT 80/100-12.7/1.27 steam turbine systems. In addition, a PTVM-100 peak-load water heating boiler is installed at this plant. The following stationary collectors exist there for: process steam at 1.27 MPa, and at 0.18 -0.245 MPa, for the main condensate, and for condensate from the main and peak-load boilers. Steam is supplied to the main boilers from the regulated 0.18 MPa withdrawal of the turbines and steam is fed to the peak-load boilers from the common 1.27 MPa collector. The primary fuel is natural gas with fuel oil as a reserve. At present the boilers are run essentially only with gas and the fuel oil is just for emergencies. The gas supply for the heating and electric power plant is from the city mains via a 0.29 MPa pipeline. There is no user for the process steam.The output of steam from the TÉTs-9 plant fell by a factor of 3.5 over 1990 -1998 (from 1800 to roughly 500 thousand tons/year) and has not risen in recent years, although the demand for electrical energy is increasing. The rather long remaining service life of the steam turbines confirms the appropriateness of the renovation of the plant that is currently under way. This project, prepared and built by the "Leningradskii metallicheskii zavod" branch of the JSC "Silovye mashiny" (Leningrad Metals Plant), involves adding on to it a medium power GTÉ-65 gas turbine unit with a complex of air-cleaning systems from the JSC "NPO TsKTI" firm and a Pr-86-13.72-535 vertical, forced-circulation boiler-utilizer (P-111) from the JSC "IK ZIOMAR" firm. Figure 1 is a conceptual diagram of the thermal layout for the steam-gas add-on. The steam-gas add-on includes the gas turbine unit 1 and the boiler-utilizer 2 with auxiliary equipment. A significant increase in the electrical power and improved environmental charact...

No abstract