Boiler water preheating system of SZS type steam boiler

Abstract

The utility model relates to an SZS type steam boiler water preheating system which comprises an SZS type steam boiler, the SZS type steam boiler is composed of an upper boiler barrel, a lower boiler barrel and a convection current collecting face, a steam distribution pipe is arranged in the lower boiler barrel and distributed in the length direction of the lower boiler barrel, and an electric gate valve is arranged at the end, stretching out of the lower boiler barrel, of the steam distribution pipe. According to the utility model, external steam is introduced to heat boiler water in the boiler, so that the boiler water is kept at a certain temperature, and the boiler is in a hot standby state, so that the boiler is started to full load within a short time, and the requirement of rapid peak regulation is met.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial boilers, in particular to a boiler water preheating system of an SZS type steam boiler. Background Art

[0002] In recent years, oil-fired (or gas-fired) boilers have widely replaced coal-fired boilers across various industries, gaining widespread adoption and development due to their compact structure, easy installation, automatic operation, and environmentally friendly emissions. In response to energy and environmental policies, a large number of thermal power plants and heat source plants have replaced their startup and peak-shaving boilers with gas-fired boilers.

[0003] The most common packaged oil-fired (or gas-fired) boilers on the market today are SZS-type, vertically mounted double-drum, D-type boilers, with the furnace located on either the left or right side of the convection tube bundle. Fuel combustion in the furnace generates high-temperature flue gas, which then curves at the rear of the furnace and enters the convection tube bundle for heat exchange. Further heat exchange occurs on the rear heating surfaces (economizer and condenser) before being discharged. The boiler typically takes 60-90 minutes to start and reach full load. This long startup time hinders the rapid peak-shaving function of thermal power plants and heat source plants. Therefore, there is an urgent need to design a boiler water preheating system for SZS-type steam boilers to enable rapid startup of oil-fired (or gas-fired) boilers for peak-shaving purposes in heat source plants and thermal power plants. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a boiler water preheating system for an SZS type steam boiler. By building a steam distribution pipe into the lower drum, steam enters the lower drum to heat the boiler water, thereby increasing the water temperature inside the boiler. At the same time, a temperature sensor is set on the upper drum to keep the boiler water temperature constant, so that the boiler is in a hot standby state for a long time and achieves the purpose of rapid startup.

[0005] The purpose of this utility model is achieved in this way:

[0006] A boiler water preheating system for an SZS type steam boiler comprises an SZS type steam boiler, wherein the SZS type steam boiler comprises an upper drum, a lower drum and a convection receiving surface, a steam distribution pipe is built into the lower drum and distributed along the length of the lower drum, and an electric gate valve is provided at one end of the steam distribution pipe extending out of the lower drum.

[0007] Preferably, the upper drum is equipped with a temperature sensor, and the temperature sensor is electrically connected to the electric gate valve.

[0008] Preferably, the steam distribution pipe extending into the lower drum is evenly distributed with steam outlet holes along its length.

[0009] Preferably, the steam outlet holes are symmetrically distributed on both sides of the bottom of the steam distribution pipe, and each side is evenly provided with a plurality of steam outlet holes along the length direction.

[0010] Preferably, the sum of the areas of the steam outlet holes is ≥ half of the cross-sectional area of ​​the steam distribution pipe.

[0011] Preferably, the steam distribution pipe is immersed in the boiler water of the lower drum.

[0012] Preferably, a check valve is provided at one end of the steam distribution pipe extending out of the lower drum.

[0013] The beneficial effects of the utility model are:

[0014] Introducing external steam to heat the boiler water inside the boiler, keeping the water at a certain temperature and putting the boiler in hot standby mode, so as to achieve startup to full load in a relatively short time and meet the demand for rapid peak load regulation;

[0015] The electric gate valve is linked to the temperature sensor signal to realize automatic start and stop of the electric gate valve, automatic operation of the boiler water preheating system, and automation of hot standby, so as to start up to full load in a shorter time and meet the needs of rapid peak regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an SZS type steam boiler water preheating system according to Example 1 of the present utility model.

[0017] Figure 2 This is a structural schematic diagram of an SZS type steam boiler water preheating system according to Example 2 of the present utility model.

[0018] Figure 3 It is a cross-sectional schematic diagram of the steam distribution pipe of the present invention.

[0019] in:

[0020] SZS type steam boiler 1; upper drum 1.1; lower drum 1.2; convection receiving surface 1.3; steam distribution pipe 2; steam outlet 2.1; electric gate valve 3; check valve 4; temperature sensor 5. DETAILED DESCRIPTION Example 1

[0021] See also Figure 1 and Figure 3 The utility model relates to a boiler water preheating system of an SZS type steam boiler, comprising an SZS type steam boiler 1, a steam distribution pipe 2, an electric gate valve 3 and a check valve 4. The SZS type steam boiler 1 is composed of an upper drum 1.1, a lower drum 1.2 and a convection receiving surface 1.3. The steam distribution pipe 2 is built into the lower drum 1.2 and distributed along the length direction of the lower drum 1.2. Steam outlet holes 2.1 are provided on the steam distribution pipe 2 extending into the lower drum 1.2. The steam outlet holes 2.1 are symmetrically distributed on both sides of the bottom of the steam distribution pipe 2, and each side is evenly distributed with multiple steam outlet holes 2.1 along the length direction, thereby improving the preheating efficiency of boiler water.

[0022] The sum of the areas of all steam outlet holes shall be ≥ half of the cross-sectional area of ​​the steam distribution pipe.

[0023] An electric gate valve 3 and a check valve 4 are provided at one end of the steam distribution pipe 2.1 extending out of the lower drum 1.2. The electric gate valve 3 controls the steam supply, and the check valve 4 can effectively prevent the backflow of boiler water.

[0024] The steam distribution pipe 2 is immersed in the boiler water of the lower drum, which facilitates the transported steam to heat the boiler water and improve the preheating efficiency.

[0025] Working principle:

[0026] External steam enters the lower drum through the steam distribution pipe, and the boiler water in the lower drum is heated and rises, gradually heating the convection heating surface and the boiler water in the upper drum, heating all the boiler water in the boiler to the set temperature, and putting the boiler in a hot standby state, so as to achieve startup to full load in a shorter time and meet the needs of rapid peak regulation. Example 2

[0027] See also Figure 2 and Figure 3 The utility model relates to a boiler water preheating system of an SZS type steam boiler, comprising an SZS type steam boiler 1, a steam distribution pipe 2, an electric gate valve 3 and a check valve 4. The SZS type steam boiler 1 is composed of an upper drum 1.1, a lower drum 1.2 and a convection receiving surface 1.3. The steam distribution pipe 2 is built into the lower drum 1.2 and distributed along the length direction of the lower drum 1.2. Steam outlet holes 2.1 are provided on the steam distribution pipe 2 extending into the lower drum 1.2. The steam outlet holes 2.1 are symmetrically distributed on both sides of the bottom of the steam distribution pipe 2, and each side is evenly distributed with multiple steam outlet holes 2.1 along the length direction.

[0028] The sum of the areas of all steam outlet holes shall be ≥ half of the cross-sectional area of ​​the steam distribution pipe.

[0029] The upper drum 1.1 is equipped with a temperature sensor 5, which is electrically connected to the electric gate valve 3. When the boiler water is heated to the set temperature, the temperature sensor 5 feeds back the temperature signal to the controller, and the controller controls the electric gate valve to automatically start and stop, thereby realizing automatic operation of boiler water preheating.

[0030] An electric gate valve 3 and a check valve 4 are provided at one end of the steam distribution pipe 2 extending from the lower drum 1.2. The electric gate valve 3 controls the steam supply amount, and the check valve 4 can effectively prevent the backflow of boiler water.

[0031] Working principle:

[0032] External steam enters the lower drum through the steam distribution pipe, and the boiler water in the lower drum is heated and rises, gradually heating the convection heating surface and the boiler water in the upper drum, and heating all the boiler water in the boiler to the set temperature. The electric gate valve is linked with the temperature sensor signal to realize the automatic start and stop of the electric gate valve and the automatic operation of the boiler water preheating system; the boiler is put into hot standby state, so that it can be started to full load in a relatively short time to meet the needs of rapid peak regulation.

[0033] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A SZS steam boiler water preheating system, comprising an SZS steam boiler, wherein the SZS steam boiler comprises an upper drum, a lower drum, and a convection receiving surface, and is characterized in that: The steam distribution pipe is built into the lower drum and distributed along the length direction of the lower drum. An electric gate valve is provided at one end of the steam distribution pipe extending out of the lower drum.

2. The SZS steam boiler water preheating system according to claim 1, characterized in that: The upper drum is equipped with a temperature sensor, which is electrically connected to the electric gate valve.

3. The SZS steam boiler water preheating system according to claim 1 or 2, characterized in that: Steam outlet holes are evenly distributed along the length of the steam distribution pipe extending into the lower boiler drum.

4. The SZS steam boiler water preheating system according to claim 3, characterized in that: The steam outlet holes are symmetrically distributed on both sides of the bottom of the steam distribution pipe, and each side is evenly distributed with multiple steam outlet holes along the length direction.

5. The SZS steam boiler water preheating system according to claim 4, characterized in that: The sum of the areas of all steam outlet holes shall be ≥ half of the cross-sectional area of ​​the steam distribution pipe.

6. The SZS type steam boiler water preheating system according to claim 1, characterized in that: The steam distribution pipe is immersed in the boiler water of the lower drum.

7. The SZS steam boiler water preheating system according to claim 1 or 6, characterized in that: A check valve is also provided on one end of the steam distribution pipe extending out of the lower drum.

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