A new type of heating device

Abstract

The utility model discloses a novel heating device, which belongs to the field of industrial energy saving, and is characterized in that: a burner is installed at the bottom of a steam superheater, an oxygen detector and a thermometer are installed at the side of the steam superheater, a combustion-aiding gas pipeline is connected to a heat exchanger I, a variable frequency fan and a regulating valve III are arranged on the combustion-aiding gas pipeline, the heat exchanger I is connected to the burner through a pipeline a, a temperature detector II is installed on the pipeline a, the heat exchanger II is connected to the burner through a pipeline b, a temperature detector III is installed on the pipeline b, the heat exchanger I is connected to the heat exchanger II through a pipeline c, and a process condensate supply three-way pipe is connected to the heat exchanger I and the heat exchanger II respectively. The utility model solves the technical problems of large fuel gas consumption and unstable furnace temperature in traditional steam superheaters, and is mainly used in energy saving of styrene devices.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial energy saving, in particular to a novel heating device. Background Art

[0002] In recent years, with the vigorous development of global industrial technology, traditional manufacturing has gradually changed from the "incremental era" to the "stock era", and reducing production costs and improving the comprehensive utilization efficiency of energy have become the foundation of enterprises. Cost reduction and efficiency improvement play an indispensable role in the chemical production process, and the rational use of energy has become an important means to reduce production costs. For this reason, the research and development of new energy-saving devices has become one of the research topics that humans are currently focusing on.

[0003] As an important heating equipment in the styrene production process, the thermal efficiency of the steam superheater is mainly determined by parameters such as excess air coefficient, exhaust gas temperature, furnace negative pressure, fuel gas and combustion air feed temperature. In traditional styrene production equipment, the fuel gas and combustion air feed temperatures of the steam superheater are low, the energy consumption of the equipment is high, and the change of external ambient temperature has a certain impact on the temperature stability of the steam superheater. In addition, the high-temperature condensate in the stripping tower kettle is directly discharged into the circulating water system without cooling. On the one hand, the heat energy in the high-temperature condensate is not reasonably utilized, and on the other hand, the cooling cost of the circulating water system will be increased. In order to fully recycle the high-temperature heat source in the condensate, reduce the unit consumption of fuel gas, reduce production costs, and improve the stability of the equipment, our company has launched research on a new type of heating device. Utility Model Content

[0004] Purpose of the invention: The purpose of the utility model is to provide a new type of heating device, which solves the technical problems of large fuel gas consumption and unstable furnace temperature in traditional steam superheater.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of heating device, including a steam superheating furnace, a burner, a heat exchanger I, a heat exchanger II, and a variable frequency fan, characterized in that: a burner is installed at the bottom of the steam superheating furnace, an oxygen detector and a thermometer are installed on the side of the steam superheating furnace, a combustion-aiding gas pipeline is connected to the heat exchanger I, a variable frequency fan and a regulating valve III are arranged on the combustion-aiding gas pipeline, the heat exchanger I is connected to the burner through a pipeline a, a temperature detector II is installed on the pipeline a, the heat exchanger II is connected to the burner through a pipeline b, a temperature detector III is installed on the pipeline b, the heat exchanger I is connected to the heat exchanger II through a pipeline c, a process condensate supply three-way pipe is respectively connected to the heat exchanger I and the heat exchanger II, a regulating valve I, a regulating valve II and a temperature controller IV are respectively installed on the process condensate supply three-way pipe, a process condensate recovery pipe is connected to the heat exchanger II, a temperature controller V is installed on the process condensate recovery pipe, a fuel gas inlet pipe is connected to the heat exchanger II, and a regulating valve IV is arranged on the fuel gas inlet pipe.

[0006] Preferably, the temperature inside the steam superheater is 900-1200°C.

[0007] Preferably, the fan frequency is 40 to 60 Hz.

[0008] Preferably, the outlet temperature of heat exchanger I is 40-50°C.

[0009] Preferably, the outlet temperature of heat exchanger II is 40-50°C.

[0010] Preferably, the temperature of the three-way pipe for supplying process condensate is 75-77°C.

[0011] Preferably, the temperature of the process condensate recovery pipe is 68-70°C.

[0012] Technical effects and advantages of the utility model:

[0013] A heat exchanger is set on the fuel gas feed pipeline. Through heat exchange with high-temperature process condensate, the fuel gas is heated up, and the temperature of the process condensate is reduced after heat exchange. This not only increases the fuel gas feed temperature and the heating efficiency of the steam superheater, but also sends the cooled process condensate to the circulating water network, reducing the cooling cost of the circulating water network.

[0014] A heat exchanger is set on the combustion air feed pipeline. Through heat exchange with high-temperature process condensate, the combustion air is heated and the process condensate is cooled after heat exchange. This not only increases the combustion air feed temperature and the heating efficiency of the steam superheater, but also overcomes the problem of unstable heating of the steam superheater caused by changes in the outside temperature. In addition, the cooled process condensate is sent to the circulating water network, reducing the cooling cost of the circulating water network.

[0015] By comparing with traditional heating technology, it is found that to achieve the same heating effect, the natural gas consumption is reduced by about 0.8NM3 / T.SM. Assuming that the styrene unit is operating at full capacity and the natural gas price is 3.8 yuan / NM3, the natural gas cost can be saved by about 1.824 million yuan each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In one embodiment, Figure 1As shown: a new type of heating device, a new type of heating device, including a steam superheating furnace 1, a burner 2, a heat exchanger I7, a heat exchanger II8 and a variable frequency fan 11, the temperature in the steam superheating furnace 1 is 900-1200°C, and the frequency of the variable frequency fan is 40-60 Hz, characterized in that: the burner 2 is installed at the bottom of the steam superheating furnace 1, the oxygen detector 3 and the thermometer 4 are installed on the side of the steam superheating furnace 1, the auxiliary gas pipeline 16 is connected to the heat exchanger I7, the outlet temperature of the heat exchanger I7 is 40-50°C, the auxiliary gas pipeline 16 is provided with a variable frequency fan 11 and a regulating valve III12, the heat exchanger I7 is connected to the burner 2 through a pipeline a, the temperature detector II5 is installed on the pipeline a, the heat exchanger II8 is connected to the burner 2 It is connected through pipeline b, on which temperature detector III6 is installed. Heat exchanger I7 is connected to heat exchanger II8 through pipeline c. Process condensate supply three-way pipe 17 is connected to heat exchanger I7 and heat exchanger II8 respectively. The outlet temperature of heat exchanger II8 is 40-50°C. Regulating valve I9, regulating valve II10 and temperature controller IV13 are respectively installed on process condensate supply three-way pipe 17. The temperature of process condensate supply three-way pipe 17 is 75-77°C. Process condensate recovery pipe 18 is connected to heat exchanger II8. The temperature of process condensate recovery 18 is 68-70°C. Temperature controller V14 is installed on process condensate recovery pipe 18. Fuel gas inlet pipe 19 is connected to heat exchanger II8. Regulating valve IV15 is arranged on fuel gas inlet pipe 19.

[0019] The method of using this device is as follows:

[0020] 1) Step 1: The fuel gas and the combustion air are connected to the bottom burner 2 of the steam superheater furnace 1, the thermometer 4 is controlled by adjusting the opening of the valve IV 15, and the oxygen detector 3 is controlled by controlling the frequency of the variable frequency fan 11 to cascade control the opening of the regulating valve III 12;

[0021] 2) Step 2: Heat exchanger II8 is used to recover the waste heat of process condensate to heat up the fuel gas. The outlet temperature of heat exchanger II8 is detected by temperature detector III6 and controlled by the opening of regulating valve II10;

[0022] 3) Step 3: Heat exchanger I7 is used to heat the combustion air. The outlet temperature of heat exchanger I7 is controlled by temperature detector II5 through the opening of regulating valve I9. The inlet / return water temperature of the process condensate is monitored by temperature controller IV13 and temperature controller V14 respectively.

[0023] 4) Step 4: Explore the energy-saving effect of the new heating device by analyzing the natural gas consumption data during the steam superheater heating process.

[0024] Comparative Example 1

[0025] The steps include:

[0026] 1) Both the fuel gas and the combustion air are connected to the bottom burner of the steam superheater furnace, and the thermometer 4 controls the opening of the regulating valve IV15;

[0027] 2) The energy-saving effect of the new heating device is explored by analyzing the natural gas consumption data during the heating process of the steam superheater, and the following data are obtained:

[0028] name Natural gas consumption (NM3 / T.SM) Cost (10,000 yuan / year) Example 1 13.75 3135 Comparative Example 1 14.55 3317.4

[0029] Summary: According to the above data, by designing a new type of heating device in the embodiment, its energy-saving effect is obviously better than that of the comparative example, and it can effectively reduce the natural gas consumption and heating stability in the steam superheater heating process.

Claims

1. A novel heating device, comprising a steam superheater (1), a burner (2), a heat exchanger I (7), a heat exchanger II (8), and a variable frequency fan (11), characterized in that: A burner (2) is installed at the bottom of a steam superheater (1), an oxygen detector (3) and a thermometer (4) are installed on the side of the steam superheater (1), a combustion-supporting gas pipeline (16) is connected to a heat exchanger I (7), a variable frequency fan (11) and a regulating valve III (12) are provided on the combustion-supporting gas pipeline (16), the heat exchanger I (7) is connected to the burner (2) through a pipeline a, a temperature detector II (5) is installed on the pipeline a, the heat exchanger II (8) is connected to the burner (2) through a pipeline b, a temperature detector III (6) is installed on the pipeline b, and a temperature detector III (7) is installed between the heat exchanger I (7) and the burner (2). The heat exchanger II (8) is connected via a pipeline c, a process condensate supply three-way pipe (17) is connected to the heat exchanger I (7) and the heat exchanger II (8) respectively, a regulating valve I (9), a regulating valve II (10) and a temperature controller IV (13) are respectively installed on the process condensate supply three-way pipe (17), a process condensate recovery pipe (18) is connected to the heat exchanger II (8), a temperature controller V (14) is installed on the process condensate recovery pipe (18), a fuel gas inlet pipe (19) is connected to the heat exchanger II (8), and a regulating valve IV (15) is installed on the fuel gas inlet pipe (19).

2. A novel heating device according to claim 1, characterized in that: The temperature inside the steam superheating furnace (1) is 900-1200°C.

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