CN209459460U - A kind of boiler blow-off residual neat recovering system - Google Patents

Abstract

The utility model discloses a waste heat recovery system for boiler sewage discharge, which is characterized in that it comprises a continuous sewage discharge expansion vessel and a domestic hot water volumetric heat exchanger, the continuous sewage discharge expansion vessel is connected with the steam boiler continuous sewage discharge, and the bottom of the continuous sewage discharge expansion vessel The sewage outlet is connected to the inlet of the air-conditioning hot water heat exchanger, and the steam outlet on the top of the continuous sewage expansion vessel is connected to the inlet of the air-conditioning hot water steam-water heat exchanger; the water volume heat exchanger is equipped with a condensate coil , Drainage coil, the outlet of the hot water steam-water heat exchanger of the air conditioner is connected to the inlet of the condensate coil, and the outlet of the condensate coil is respectively connected to the cooling tower to make up water, and the internal communication of the water volume heat exchanger; The outlet one of the heater is connected to the inlet of the drain coil, and the outlet of the drain coil is connected to the cooling tower to make up water. The utility model utilizes the steam and drainage produced by the boiler blowdown to preheat the return water of the air-conditioning hot water in two stages, which can effectively improve the thermal efficiency of the boiler and reduce the energy consumption of the air-conditioning hot water preparation.

Description

A Boiler Waste Heat Recovery System

technical field

The utility model relates to a waste heat recovery system for boiler blowdown, which can be used for utilization and recovery of heat and water from high-temperature continuous sewage blowdown produced by boilers in various industrial buildings and civil buildings, and belongs to the technical field of energy saving.

Background technique

The surface blowdown of steam boilers is often directly discharged to the outdoor blowdown cooling pool, wasting a lot of waste heat, and in order to meet the requirement that the discharge temperature of the blowdown water should be less than 40°C, a large amount of cooling water is required for mixing and cooling, so the waste of cooling water is also very serious. On the other hand, industrial buildings and civil buildings need to prepare air-conditioned hot water and domestic hot water in winter, which consumes a lot of fuel. Therefore, recycling the water and heat of steam condensate is of great significance to improving energy efficiency, saving fuel and reducing water costs, especially for the preparation of air-conditioning hot water and domestic hot water.

Contents of the invention

The problem to be solved by the utility model is: the problem of wasteful preheating of the surface of the steam boiler.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is to provide a waste heat recovery system for boiler blowdown, which is characterized in that it includes a continuous blowdown expansion vessel and a domestic hot water volumetric heat exchanger, and the continuous blowdown expansion vessel is connected to the steam boiler continuously. The sewage is connected, the sewage outlet at the bottom of the continuous sewage expansion vessel is connected to the inlet of the air-conditioning hot water heat exchanger, and the steam outlet on the top of the continuous sewage expansion vessel is connected to the inlet of the air-conditioning hot water steam-water heat exchanger; water volume type The heat exchanger is equipped with a condensate coil and a drain coil, the outlet of the air-conditioning hot water steam-water heat exchanger is connected to the inlet of the condensate coil, and the outlet of the condensate coil is respectively connected to the inlet of the domestic hot water replenishment control valve group , Cooling tower replenishment, the outlet of the domestic hot water replenishment control valve group is connected to the water volume heat exchanger; the outlet of the air-conditioning hot water water heat exchanger is connected to the inlet of the drain coil, and the outlet of the drain coil is respectively connected The inlet of the cooling tower replenishment and air-conditioning hot water replenishment control valve group, the outlet of the air-conditioner hot water replenishment control valve group is connected with the preheated air-conditioning hot water return water; The return water is connected, the outlet 2 of the air-conditioning hot water heat exchanger is connected with the inlet 2 of the air-conditioning hot water steam-water heat exchanger, and the outlet 2 of the air-conditioning hot water steam-water heat exchanger is connected with the preheated air-conditioning hot water return water.

The beneficial effect of the utility model is that: using the steam and drainage produced by the boiler blowdown to preheat the return water of the air-conditioning hot water in two stages can effectively improve the thermal efficiency of the boiler and reduce the energy consumption of the air-conditioning hot water preparation. Utilizing condensed water as the heat source of domestic hot water and replenishing water can improve the heat and water use efficiency of condensed water. Utilizing drainage as hot water for air conditioning and cooling towers can greatly reduce water consumption and save water costs. The condensed water and drainage can be transported and supplemented by the residual pressure of the boiler blowdown, and there is no need to set up a supplementary water pump, which reduces the equipment investment cost.

Description of drawings

Fig. 1 is a schematic diagram of a boiler waste heat recovery system provided by the utility model.

Detailed ways

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

Example

As shown in Figure 1, a boiler blowdown waste heat recovery system provided by the utility model includes a boiler blowdown waste heat recovery system, which is characterized in that it includes a continuous blowdown expansion vessel 1 and a domestic hot water volumetric heat exchanger 4 , the continuous sewage expansion vessel 1 is connected with the steam boiler continuous sewage water A, the sewage outlet at the bottom of the continuous sewage expansion vessel 1 is connected with the inlet of the air-conditioning hot water water heat exchanger 3, and the steam outlet at the top of the continuous sewage expansion vessel 1 is connected to the air conditioner The inlet of the hot water steam-water heat exchanger 2 is connected; the water volume heat exchanger 4 is equipped with a condensate coil 8 and a drain coil 9, and the outlet of the air-conditioning hot water steam-water heat exchanger 2 is connected to the condensate coil 8 The inlet of the condensate coil 8 and the outlet of the condensate coil 8 are respectively connected to the inlet of the domestic hot water replenishment control valve group 6 and the cooling tower replenishment D, and the outlet of the domestic hot water replenishment control valve group 6 communicates with the water volume heat exchanger 4; The outlet 1 of the hot water water heat exchanger 3 is connected to the inlet of the drain coil 9, and the outlet of the drain coil 9 is respectively connected to the inlet of the cooling tower replenishment D, the air conditioner hot water replenishment control valve group 7, and the air conditioner hot water replenishment control valve The outlet of group 7 is connected with the preheated air-conditioning hot water return water B; the inlet two of the air-conditioning hot water water heat exchanger 3 is connected with the air-conditioning hot water return water C, and the outlet two of the air-conditioning hot water water heat exchanger 3 It is connected with the inlet 2 of the air-conditioning hot water steam-water heat exchanger 2, and the outlet 2 of the air-conditioning hot water steam-water heat exchanger 2 is connected with the preheated air-conditioning hot water return water B.

The continuous sewage water A of the steam boiler enters the continuous sewage expansion vessel 1, in which the secondary steam at the top is connected to the air-conditioning hot water steam-water heat exchanger 2 to heat the air-conditioning hot water return water C on the primary side, and the condensed water is discharged to the The condensed water coil 8 of the domestic hot water volumetric heat exchanger 4 preheats the domestic hot water, and then serves as a cooling tower replenishment D, and part of the condensed water passes through the domestic hot water replenishment control valve group 6 as domestic hot water replenishment and is connected to the domestic hot water Volumetric heat exchanger 4. Continuous sewage expansion vessel 1 Bottom drainage connected to air-conditioning hot water water heat exchanger 3 Primary side heating of air-conditioning hot water return water C, after heat exchange drainage connected to domestic hot water volumetric heat exchanger 4 Drainage coil 9 Preheating Domestic hot water is then used as cooling tower replenishment D, and part of the drainage is connected to the air-conditioning hot water system as air-conditioning hot water replenishment through the air-conditioning hot water replenishment control valve group 7. Condensed water and drain water are combined into a cooling tower make-up water D and sent to the cooling tower.

Claims (1)

1. a kind of boiler blow-off residual neat recovering system, which is characterized in that including continuous blowdown flash tank (1) and domestic hot-water's volume Formula heat exchanger (4), continuous blowdown flash tank (1) are connected to steam boiler continuous blowdown water (A), continuous blowdown flash tank (1) bottom The sewage draining exit in portion is connect with the import one of air conditioning hot water water- to-water heat exchanger (3), the steam (vapor) outlet at the top of continuous blowdown flash tank (1) It is connect with the import one of air conditioning hot vapor-water heat exchanger (2)；Condensed water coil pipe (8), draining are equipped in water capacity formula heat exchanger (4) Coil pipe (9), the outlet one of air conditioning hot vapor-water heat exchanger (2) connect the import of condensed water coil pipe (8), condensed water coil pipe (8) Outlet is separately connected import, the cooling tower moisturizing (D) of domestic hot-water's moisturizing control valve group (6), domestic hot-water's moisturizing control valve group (6) it is connected to inside outlet and water capacity formula heat exchanger (4)；The outlet one of air conditioning hot water water- to-water heat exchanger (3) and water drainage coiled pipe (9) import connection, the outlet of water drainage coiled pipe (9) is separately connected cooling tower moisturizing (D), air conditioning hot moisturizing control valve group (7) Import, the outlet of air conditioning hot moisturizing control valve group (7) is connected to the air conditioning hot return water (B) after preheating；Air conditioning hot water The import two of water- to-water heat exchanger (3) is connected to air conditioning hot return water (C), the outlet two of air conditioning hot water water- to-water heat exchanger (3) and air-conditioning The import two of hot water vapor-water heat exchanger (2) connects, the outlet two of air conditioning hot vapor-water heat exchanger (2) and the air conditioning hot after preheating Return water (B) connection.