Boiler wastewater heat recovery device

1. Overview

In order to ensure steam quality and boiler safety during normal operation, various boilers need to continuously and regularly discharge some sewage with high TDS values and harmful impurities at the bottom of the steam drum. The current common practice for treating boiler wastewater is to discharge continuous wastewater into a continuous discharge expansion container, flash evaporate a small amount of steam and pass it through a deaerator for reuse. The remaining mostly high-temperature wastewater is discharged into a fixed discharge expansion container together with the boiler's periodic wastewater for expansion and pressure reduction. The small amount of steam flash evaporated is directly discharged into the atmosphere, and the remaining wastewater of about 100 ℃ is mixed with cold water for cooling before being discharged or directly discharged into a trench. Due to the working pressure of deaerators, especially the higher pressure of high-pressure deaerators, the temperature of the discharged water from the continuous discharge expansion tank will be higher. This not only wastes a lot of heat energy and high-quality water sources, but also causes significant white steam pollution and noise pollution to the surrounding environment due to the large amount of steam discharged from the top of the fixed discharge.

2. Working principle and technical advantages of boiler wastewater energy harvesting device

In order to solve the problems of energy waste and environmental pollution in existing technologies, Lianyungang Huaneng Electric Power Auxiliary Equipment Co., Ltd. has successfully developed the fifth generation "boiler wastewater energy harvesting device". Patent numbers: 201710409090.3, 201720638563.1

This device can completely replace the original conventional system configuration with one set of devices: continuous discharge expansion container, fixed discharge expansion container, continuous discharge energy collector, and fixed discharge energy collector. It can also eliminate the steam pipeline connecting the continuous discharge expansion container to the deaerator in the conventional system, greatly reducing the on-site footprint, connecting pipelines, and control valves, thereby greatly reducing the system's infrastructure investment and installation costs.

3. Classification of boiler wastewater energy harvesting devices

In order to meet the various needs of different customers, four structural types, three pressure levels, ten specifications, and more than 100 models of boiler wastewater energy harvesting devices have been developed. Special specifications and models of boiler wastewater energy harvesting devices can also be customized according to customers' special requirements.

3.1 Classification by structural type

The structural form can be divided into four categories: internal cooler with condensing device (NN), internal cooler without condensing device (NW), external cooler with condensing device (WN), and external cooler without condensing device.

The non condensing device is mainly used in systems that require the output of secondary steam as a heat source, typically by introducing secondary steam into a deaerator as heating steam. For the rest, it is generally recommended to use boiler wastewater energy harvesting devices with built-in condensation devices to ensure no steam emissions.

3.2 Classification by pressure level

The pressure levels are divided into three categories: vacuum type (ZK design pressure -0.1MPa), atmospheric pressure type (CY design pressure 0.1MPa), and pressure type (YL design pressure 0.8MPa).

3.3 Model designation instructions

4. Outline drawing of boiler wastewater energy harvesting device

5. Technical content to be communicated during ordering

In order to ensure that the supply equipment has a high cost-effectiveness while meeting the actual working conditions of the process system, it is best to provide accurate process parameters and expectations for equipment performance when ordering:

5.1 Sewage Process Parameters

Provide the pressure, temperature, and flow rate of each sewage that needs to be treated, as well as the requirements for the pressure and temperature of the treated sewage.

5.2 Cold source process parameters

Provide the inlet pressure, temperature, and available quantity of the cold source (mostly desalinated water) that needs to be heated, as well as the requirements for the outlet pressure and temperature of the cold source.

5.3 Requirements for secondary steam parameters

If you need to provide secondary steam, please specify the requirements for the temperature and demand of the secondary steam.

5.4 Other requirements for the device

If you have any requirements, you can propose various requirements such as process system combination type, main body volume, structural type, design pressure, design temperature, main body material, heat exchange tube material, external dimensions, pipe mouth size and orientation, display and control requirements, etc. Our professional team can tailor products and services that are as close to your expectations as possible.

Specification parameters:

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