JPH04270801A - Heating device for boiler with jacket - Google Patents

Abstract

PURPOSE:To provide a heating device for boilers with a jacket which aims at using saturated water (water at boiling point) of pressure over atmospheric pressure as a heating medium. CONSTITUTION:A water shooting pipe 14 connected to a supply water pipe 11 is inserted from the outside into the steam generating cylinder 10 of a super- moist saturated steam generating device A, and a water section 15 stores supplied water. And, in the water section 15 a steam injection pipe 17 connected to a steam pipe 16 is inserted. And, in the upper face of the steam generating cylinder 10 a saturated water temperature control sensor 24 which makes the opening and closing of a solenoid valve 18 installed on the steam pipe 16 and senses the steam temperature in a steam chamber 22 and water level control electrodes 23 which control the opening and closing of a solenoid valve 12 installed in the supply water pipe 11 are respectively provided. Since saturated water 27 of pressure over the atmospheric pressure is used as a heat medium, the device has an effect that defects such as a low heat conductivity, a large calorie loss, no temperature gradient, etc., which heated steam, moist saturated steam, hot water, etc., as a heat medium have respectively are removed.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a jacketed kettle heating device, and more particularly to a jacketed kettle heating device characterized in that saturated water (water at the boiling point) at a pressure higher than atmospheric pressure is used as a heat medium. It is.

0002

[Prior Art] Conventionally, as a heat medium in a jacketed boiler, (a) superheated steam, due to the strength of the jacketed boiler, wet saturated steam is depressurized (2 kg/
cm2g) and use. By reducing the pressure (throttling), the saturated steam becomes superheated steam. (b) Moist saturated steam (c) Hot water (boiling point 100°C or less at atmospheric pressure)
The above (a), (b), and (c) were used.

0003

[Problem to be solved by the invention] However, the above (a),
(B) and (C) each have the following problems. (a) Superheated steam The heat transfer coefficient of superheated steam is 25 to 100 kcal/m2h℃
The amount of heat transfer is very poor. (b) Moist saturated steam Assuming that moist saturated steam is condensed in the form of a film on the heat transfer surface, the heat transfer coefficient is 5000 to 10000 kcal/
Although the enthalpy of saturated water becomes condensed water (drain) and is released outside the jacket at a high temperature without being used, only the latent heat of vaporization is actually used for heating.

[0004] Taking 2 kg/cm2 abs of saturated steam as an example, the enthalpy of saturated water is 11
9.9kcal/kg Enthalpy of saturated steam 646.2kcal/kg Latent heat of vaporization 52
6.3 kcal/kg (Enthalpy of saturated water ÷ Enthalpy of saturated steam) x 100 ≒ 18.5%, that is, 18.5% of the heat held by saturated steam is released to the outside of the jacket without being used. It turns out. (c) Hot Water Under atmospheric pressure, it is impossible to maintain the hot water temperature at 100° C. or higher. It is usually heated at a temperature of about 70 to 90°C. The heat transfer coefficient is good, but the
The temperature difference between the hot water temperature on the ket side and the fluid on the heated side becomes extremely small, and the amount of heat transferred as a whole is restricted. As mentioned above, superheated steam, wet saturated steam, hot water, etc. as heat media each have drawbacks such as low heat transfer coefficient, large calorie loss, and inability to maintain temperature drop.

[0005]

[Means for Solving the Problems] The present invention has been made to solve the above problems, and is constructed as follows.

That is, the jacket pot heating device of the present invention has the following features:
A super-humid saturated steam generator that generates low-pressure super-humid saturated steam by injecting saturated steam into the water part of the steam generating shell and indirectly heating and evaporating it, and a A jacket pot in which an annular saturated water blowing pipe having a large number of downward injection holes is provided in the jacket chamber, one end of which is connected to the bottom of the steam generating body of the ultra-wet saturated steam generator, and the other end of which is connected to the saturated water blowing pipe. It consists of a saturated water supply pipe connected to each of the pipes, and a saturated water return pipe connected to a line pump, which has one end connected to the jacket chamber and the other end connected to the steam pipe connected to the steam injection pipe of the ultra-wet saturated steam generator. , which is characterized by using saturated water at atmospheric pressure or higher as a heat medium.

Next, the jacket pot heating device of the present invention will be described in detail with reference to the drawings with reference to embodiments.

[Embodiment] First, reference numeral 10 is a steam generation shell of a super-humid saturated steam generator A, and a water supply pipe 11 is inserted into the steam generation shell 10 from the outside.
A water injection pipe 14 connected to the tank is inserted, and a water section 15 stores water supply. A steam injection pipe 17 connected to the steam pipe 16 passes through the water section 15 . Further, on the upper surface of the steam generation shell 10, there is a saturated water temperature control sensor 24 that detects the steam temperature in the steam chamber 22 that controls the opening and closing of the solenoid valve 18 installed in the steam pipe 16, or a solenoid valve 12 installed on the water supply pipe 11 side. Water level control electrodes 23 that control opening and closing are provided respectively. In the figure, 13, 20, and 21 are check valves, 19 is a pressure reducing valve, and 25 is a safety valve. The above is the ultra-humid saturated steam generator A.

Next, 1 covers the outer periphery of the hook body 2 with a jacket 3.
A jacket pot surrounded by a jacket chamber 4 to form a jacket chamber 4,
In the jacketed pot 1, an annular saturated water blowing pipe 6 having a large number of downward injection holes 7 is provided in the jacket chamber 4, as shown in FIG. 2, on the lower surface excluding a part of the circumference. Note 5
is without air.

8 has one end connected to the inner bottom of the steam generation shell 10 of the super-wet saturated steam generator A, and the other end connected to the saturated water blowing pipe 6.
9 is a saturated water supply pipe connected to the jacket chamber 4 at one end and the super-moist saturated steam generator A at the other end.
This is a saturated water return pipe connected to a line pump 26 which is connected to a steam pipe 16 connected to a steam injection pipe 17. Note 28
, 29 is a valve.

00010]

[Effects of the Invention] As mentioned above, the jacket pot heating device of the present invention uses saturated water 27 at a pressure higher than atmospheric pressure as a heat medium, so superheated steam, wet saturated steam, hot water, etc. can be used as a heat medium. It has the excellent effect of overcoming the disadvantages of each type, such as low heat transfer coefficient, large calorie loss, and inability to compensate for temperature differences. Also, when using saturated water (water at the boiling point), the heat transfer of saturated water is 1500
~45,000 kcal/m2h℃ is the best heat transfer coefficient of the heat medium, and depending on the method of supplying the heat medium, the highest value is 45
000 kcal/m2h°C. Table 1 summarizes the effects of this invention in comparison with conventional techniques.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the jacket pot heating device of the present invention.

FIG. 2 is a bottom view of the saturated water injection pipe.

[Explanation of symbols]

1 Jacket pot 2　Kettle body 3 Jacket 4 Jacket room 5 Air bleed 6 Saturated water injection pipe 7 Injection hole 8 Saturated water supply pipe 9 Same return tube 10 Steam generation shell 11 Water supply pipe 12 Solenoid valve 13　Reverse valve 14 Water injection pipe 15 Water section 16 Steam pipe 17 Steam injection pipe 18 Solenoid valve 19 Pressure reducing valve 20, 21 Reverse valve 22 Steam room 23 Water level control electrode 24 Saturated water temperature control sensor 25 Safety valve 26 Line pump 27 Saturated water 28, 29 valve A. Super humid saturated steam generator

[Table 1]

Claims (1)

[Claims] A super-humid saturated steam generator that generates low-pressure super-humid saturated steam by injecting saturated steam into the water part of the steam generating shell and indirectly heating and evaporating it, and a A jacket pot in which an annular saturated water blowing pipe having a large number of downward injection holes is provided in the jacket chamber, one end of which is connected to the bottom of the steam generating body of the ultra-wet saturated steam generator, and the other end of which is connected to the saturated water blowing pipe. It consists of a saturated water supply pipe connected to each of the pipes, and a saturated water return pipe connected to a line pump, which has one end connected to the jacket chamber and the other end connected to the steam pipe connected to the steam injection pipe of the ultra-wet saturated steam generator. , a jacketed pot heating device characterized by using saturated water at atmospheric pressure or higher as a heat medium.